Jornada Data

Displaying 1 - 172 of 172

Original Investigator: David Lightfoot
Duration: 1983 - 1985
Abstract: This data on annual herbaceous plants was measured on Jornada grasshopper study plots located on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200m south of the LTER transect. Two additional sets of three plots were located 5km and 10km south of the LTER transect. Each plot was composed of two 50m belt transects, each divided into ten 5m2 quadrats. Annual plants were measured in the NE 1m2 of each quadrat, once in May, July and September in 1983, 1984 and 1985. All individuals of each species were counted and measured. A mean diameter, height, and the total number of individuals/1m2/quadrat were recorded. This study is complete.
Dataset ID: 210370002


Original Investigator: David Lightfoot
Duration: 1983 - 1985
Abstract: This data on annual herbaceous plants was measured on Jornada grasshopper study plots located on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200m south of the LTER transect. Two additional sets of three plots were located 5km and 10km south of the LTER transect. Each plot was composed of two 50m belt transects, each divided into ten 5m2 quadrats. Annual plants were measured in the NE 1m2 of each quadrat, once in May, July and September in 1983, 1984 and 1985. All individuals of each species were counted and measured. A mean diameter, height, and the total number of individuals/1m2/quadrat were recorded. This study is complete.
Dataset ID: 210370002


Original Investigator: Laureano Gherardi
Data contact: Darren James
Duration: 2009 - 2014
Abstract: This ongoing dataset contains annual aboveground net primary productivity (ANPP) data from a study at the Jornada Experimental Range (JER) in southern New Mexico. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009, has five precipitation treatments (see Methods) and contains 50 plots (10 per treatment). This data package contains 6-year (2009 to 2014) means of ANPP per plot. Annual and more recent data are available and will be released pending an upcoming publication. Figure of 6-year ANPP by plant functional group: https://jornada.nmsu.edu/sites/jornada.nmsu.edu/files/files/data/ANPP_figure.jpg Location of dataset on EDI: https://portal.... more
Dataset ID: 210328001


Original Investigator: Dale A Gillette
Data contact: Greg Okin
1995 - ongoing
Abstract: Distance of crust surface to a crossbar set into the soil. Three "torvane" measurements that measure the torque needed to break the crust is also recorded. These measurements are made monthly near each of three monitoring towers (East, Middle, West) on the Scrape Site.
Dataset ID: 210122001


Original Investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Abstract: Decomposition models typically under-predict decomposition relative to observed rates in drylands. This discrepancy indicates a significant gap in our mechanistic understanding of carbon and nutrient cycling in these systems. Recent research suggests that certain drivers of decomposition that are often not explicitly incorporated into models (e.g., photodegradation and soil-litter mixing; SLM) may be important in drylands, and their exclusion may, in part, be responsible for model under-predictions. To assess the role of SLM, litterbags were deployed in the Chihuahuan Desert and interrelationships between vegetation structure, SLM, and rates of decomposition were quantified. Vegetation structure was manipulated to simulate losses of grass cover from livestock grazing and shrub... more
Dataset ID: 210301001


Original Investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Abstract: Mesquite litter mass loss from decomposition associated with soil-litter mixing.   Decomposition models typically under-predict decomposition relative to observed rates in drylands. This discrepancy indicates a significant gap in our mechanistic understanding of carbon and nutrient cycling in these systems. Recent research suggests that certain drivers of decomposition that are often not explicitly incorporated into models (e.g., photodegradation and soil-litter mixing; SLM) may be important in drylands, and their exclusion may, in part, be responsible for model under-predictions. To assess the role of SLM, litterbags were deployed in the Chihuahuan Desert and interrelationships between vegetation structure, SLM, and rates of decomposition were quantified. Vegetation structure was... more
Dataset ID: 210301002


Data file: File nh3vol88.dat
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1988 - 1988
Abstract: Ammonia volatilization was measured at three sites in the Chihuahuan Desert of southern New Mexico, U.S.A. In dry soils, ammonia volatilization ranged from 9 to 11 micrograms of nitrogen per square meter per day, but rates increased to 95 micrograms of nitrogen per square meter per day in a shrubland site after an experimental addition of water. Ammonia volatilization also increased with experimental additions of NH4Cl and decreased with additions of sucrose. Competition by nitrifiers for available NH4+ had little effect on NH3 volatilization: N-Serve, added to inhibit nitrification, decreased NH3 volatilization in a grassland site and had little effect at other sites. We suggest that NH3 volatilization is controlled by the rate of mineralization of NH4+ from soil organic matter, and... more
Dataset ID: 210393001


Data file: File anmltran.dat
Original Investigator: David Lightfoot
Data contact: John Anderson
Duration: 1989 - 1994
Abstract: Data for rabbits, birds, and lizards recorded from the LTER II animal transects. Data consists of species names, numbers of individuals, and distances observed from transects. Data is collected from each transect once every two weeks. See history file for exceptions.
Dataset ID: 210009001


Original Investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains chemical analyses for soil samples collected from five ant nests for each of the three sites for total nitrogen, (ammonium, nitrate), inorganic phosphorus, and exchangeable cations (K+, Na+, Ca2+ and Mg2... more
Dataset ID: 210368002


Original Investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains % organic matter of soils sampled in January 1987 from ant nests and adjacent reference sites.
Dataset ID: 210368003


Original Investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains soil water content data measured gravimetrically at monthly intervals from January to May. Soil samples were taken from ant nest edge and from adjacent reference sites (5 m apart).
Dataset ID: 210368004


Data file: Binary Data ablitape.raw
Original Investigator: Debra Peters
Data contact: John Anderson
Duration: 2000 - 2000
Abstract: LTER-I Transect plant line intercept data. This data set is as transcribed (UNSORTED) from cassette tape with one intercept observation per record. Data consist of week number, transect, station, segment number, plant species, and length of species intercepted by line stretched between 2 rebar the length of the 30 meter plant line intercept transect. Measurements are made on 30-meter line intercept transects located perpendicular to each of 91 stations on each of the 2.7 km long Control, Treatment, and Alternate Control Transects established at the beginning of LTER-I. Each plant line transect is divided into 6 5-meter segments. Annuals are measured only in the first meter of segments 1, 2, and 3 and in the last meter of segments 4, 5, and 6. Perennials are measured for the full length of... more
Dataset ID: 210384001


Data file: File ablilt.dat
Original Investigator: Debra Peters
Data contact: John Anderson
Duration: 2000 - 2000
Abstract: On March 19, 2000, an arson burn occurred of 2.5 acres of the upper grassland area on the Summerford bajada just below the powerline road. The area affected included portions of the LTER-I Transect Plant Line Intercept study that was begun in 1982. To evaluate the impact of the burn on those lines, the line intercepts were read for the upper grassland area extending from immediately above the creosotebush fringe to the base of Summerford Mountain. The stations measured were C73-C89, T75-T90, and X76-X91 (Control, Treatment, and Alternate Control, respectively). Measurements were made immediately after the burn, after the spring growing season, and after the fall growing season in 2000 only. In the initial sampling period, the burn area intercepted by the line was noted in the data set... more
Dataset ID: 210384002


Original Investigator: David Lightfoot
Duration: 1996 - 2001
Abstract: Objectives. Desertification is hypothesized to have altered the spatial and temporal availability of resources required by the biota. Results of desertification on the Jornada include changes to shrub dominated communities and major soil changes. We hypothesize that these shifts in vegetation have changed resources temporally for many of the consumers. If grassland systems respond to rainfall without significant lags, but shrub systems do not, then consumer species should reflect these differences. In addition, shifts from grassland to shrubland results in greater structural heterogeneity of the habitats. We have hypothesized that consumer populations, diversity, and densities of some consumers will be higher in grasslands than in shrublands. Diversity and/or densities are hypothesized to... more
Dataset ID: 210008001


Original Investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Abstract: Data for arthropods captured in pitfall traps on LTER II consumer plots. Data includes order, family, genus, species, and number.
Dataset ID: 210008002


Original Investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Abstract: Data for arthropods captured in pitfall traps on LTER II consumer plots. Data includes order, family, genus, species, and number.
Dataset ID: 210008002


Data file: File ltrophic.dat
Original Investigator: David Lightfoot
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: *We conducted a field study to test the hypothesis that creosotebush (Larrea tridentata) shrubs growing in naturally nutrient-rich sites had better quality foliage and supported greater populations of foliage arthropods than shrubs growing in nutrient-poor sites. This is data for foliage arthropods sampled from LVAR creosotebush shrubs. Sampling was done in April of 1985 and 1986. Shrubs were sampled from 5 separate sites designated A-E. 10 shrubs of 3 different types, R=random, H=high quality, L=low quality were sampled at each site. Total numbers of taxa and individuals of each major trophic group, herbivores, predators, omnivores, from each of the 30 shrubs/site are listed.
Dataset ID: 210369001


Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1983 - 2017
Abstract: Atmospheric deposition as found in dryfall (dust) and wetfall precipitation has been collected and analyzed since 1983 using an Aerochem Metrics wetfall/dryfall collector located at the Jornada LTER weather station north of Las Cruces, NM, USA. Wetfall occurring as precipitation is collected after each event with a sample size large enough to analyze. Each sample is analyzed for Br, Ca, Cl, F, HPO4, K, Mg, Na, NH4, NO3/NO2, SO4, Total N, and Total P. Analysis of Sr and Dissolved Organic Nitrogen was discontinued in 2003. Dryfall data are available as a separate data package.  
Dataset ID: 210128002


Data file: File bdpltres.dat
Original Investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1999 - 1999
Abstract: Pilot study to examine feasibility of measuring individual species response to competing vegetation removal
Dataset ID: 210121004


Original Investigator: Laura Huenneke
Data contact: John Anderson
1996 - ongoing
Abstract: These data are collected to provide a measurement of rainfall at the Biodiversity site. They are detailed records providing a time stamp of month/day/year hour:minute:second for each tip of the tipping bucket rain gauge (equal to 0.1 mm of precipitation).
Dataset ID: 210121008


Original Investigator: Laura Huenneke
Data contact: John Anderson
1996 - ongoing
Abstract: These data are collected to provide a measurement of rainfall at the Biodiversity site. They are Daily Summary data providing daily totals for those dates that precipitation occurred. Values are in millimeters (mm).
Dataset ID: 210121005


Original Investigator: Walter G Whitford
Duration: 1989 - 1989
Abstract: In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965).  Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control... more
Dataset ID: 210015001


Data file: File bdremove.dat
Original Investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1995 - 1995
Abstract: Sum of dry mass removed for each plant growth form from each plot of biodiversity experiment. Amount of plant material removed in initial establishment of plant diversity treatments was recorded for later use as covariate or measure of disturbance. Material was weighed in the field by species, and species-level data are available from Huenneke; however, this file summarizes plant material removed (dry mass) by growth form (shrub, subshrub, perennial grass, succulent) and by total live dry mass. Also provided are mass of dead material collected from plots (same species as live material removed for each treatment) and total dry mass, live plus dead.
Dataset ID: 210121003


Original Investigator: Tim Ward
Duration: 1988 - 1990
Abstract: This dataset quantities dissolved nutrients in water surface runoff from natural rainfall events at experimental hydrology plots on the New Mexico State University Ranch and USDA Jornada Experimental Range. Chemical analyses include F, Cl, NO3, SO4 by ion chromatography, NH4 by autoanalyzer, Ca, Mg, Na, K by atomic absorption spectrophotometry, and total N and P by auto- analyzer.  Nutrient losses from shrubland plots were greater than from grassland plots. The greater nutrient losses in shrublands were due to higher runoff, rather than higher nutrient concentrations in runoff. This study is complete. Refer to: Schlesinger, W. H., T. J. Ward, and J. Anderson. 2000. Nutrient losses in runoff from grassland and shrubland habitats in southern New Mexico II: Field plots. Biogeochemistry 49:... more
Dataset ID: 210001003


Duration: 1988 - 1990
Abstract: This dataset quantities dissolved nutrients in water surface runoff from natural rainfall events at experimental hydrology plots on the New Mexico State University Ranch and USDA Jornada Experimental Range. Chemical analyses include F, Cl, NO3, SO4 by ion chromatography, NH4 by autoanalyzer, Ca, Mg, Na, K by atomic absorption spectrophotometry, and total N and P by auto- analyzer.  Nutrient losses from shrubland plots were greater than from grassland plots. The greater nutrient losses in shrublands were due to higher runoff, rather than higher nutrient concentrations in runoff. This study is complete. Refer to: Schlesinger, W. H., T. J. Ward, and J. Anderson. 2000. Nutrient losses in runoff from grassland and shrubland habitats in southern New Mexico II: Field plots. Biogeochemistry 49:... more
Dataset ID: 210001003


Original Investigator: Laura Huenneke
Duration: 1997 - 2002
Abstract: Arid and semi‐arid ecosystems often exhibit diverse plant growth forms in water‐limited environments, but it is unclear whether resource competition (interference) is actually important in structuring communities. We chose a diverse Chihuahuan desert shrubland to examine the response of the plant community to experimental removals of selected perennial plant species or groups of species. Four treatments involved the removal of all individuals of all species of a single functional group (functional group removals: shrub removal, succulent removal, subshrub removal, perennial grass removal). Three other treatments involved removing species within functional groups. These seven treatments plus a control (no plants removed) were replicated six times each in 25×25 m experimental plots, in... more
Dataset ID: 210121001


Original Investigator: Debra Peters
Data contact: Debra Peters
2008 - ongoing
Abstract: Canopy Gap and Basal Gap Intercept data are collected annually for this project beginning in 2008. No data were collected in 2011. There are 4 pairs of plots consisting of control and treatment. Each plot is 8x8 meters with an 8x8 meter buffer plot above and below it. Treatment plots have connectivity modules (conmods) installed to decrease gap size between perennials. Buffer plots do not have conmods. Four 24-meter transects run through the plot and 2 buffer plots. These transects are spaced 0.8, 2.8, 4.3, and 7.2 meters across the plots (denoted as 1, 3, 5, and 7 meters in the database), paralleling the long axis of the combined buffer plots and central plot. Aeolian site:                Control plots 2,4,5,8  Treatment plots 1,3,6,7 Dona Ana site:            Control plots 2,4,5,7  ... more
Dataset ID: 210308001


Original Investigator: Debra Peters
Data contact: Debra Peters
2008 - ongoing
Abstract:     Line-Point Intercept data are collected annually for this project beginning in 2008. No data were     collected in 2011. There are 4 pairs of plots consisting of control and treatment. Each plot is     8x8 meters with an 8x8 meter buffer plot above and below it. Treatment plots have connectivity modules     (conmods) installed to decrease gap size between perennials.  Buffer plots do not have conmods.     Four 24-meter transects run through the plot and 2 buffer plots. These transects are spaced     0.8, 2.8, 4.3, and 7.2 meters across the plots (denoted as 1, 3, 5, and 7 meters in the database),     paralleling the long axis of the combined buffer plots and central plot.          Aeolian site:         Control plots 2,4,5,8  Treatment plots 1,3,6,7          Dona Ana site:        ... more
Dataset ID: 210308002


Original Investigator: Jeff Herrick
Duration: 2008 - 2010
Abstract:     Material moved from the overland flow of water resulting from precipitation is collected in     belowground containers to get an estimate of that material entering and exiting the plots.     Water and material collected in a container solely from a rain or wind event is not collected.     Bedload oven-dry weight is obtained and the percent Loss on Ignition is calculated.
Dataset ID: 210308003


Original Investigator: Greg Okin
Data contact: Greg Okin
2008 - ongoing
Abstract:     There are 3 sites for this study:  Gravelly Ridges, Aeolian, and Dona Ana.  Within each site,     there are 8 plots.  The plots are 8x8 meters and have an 8x8 buffer zone on both sides of the     plot (up and down).  There are four BSNE stands for each plot, 2 in each of the 2 buffer zones     (8 collectors per plot).  Each stand contains 2 BSNE collectors with the collection opening at     10cm and 30cm height and an opening of 2 cm wide and 5 cm height.  These BSNE collectors are in     a fixed position pointing into the direction of the prevailing wind, which corresponds to the     plot alignment.  The collectors in the upwind buffer are facing away from the plot and the     collectors in the downwind buffer are facing into the plot.  The idea is the upwind BSNEs     measure the... more
Dataset ID: 210308004


Original Investigator: Jeff Herrick
Data contact: Jeff Herrick
2008 - ongoing
Abstract:     Repeat digital groundbased photos are taken once to twice a year to document plant litter and     soil deposition or removal by wind and water transport on ten microplots located on each of the     8 plots at each of the Aeolian, Dona Ana, and Gravelly Ridges sites. Five photos are taken of     each microplot: One overhead (from directly over the microplot) and 4 lateral views at ground     level of the microplot from each cardinal direction.    Digital filenames are fully descriptive of the site, plot, microplot, photo view, and date taken.    Photo filename structure:       Example: A1-1E_20101109_IMG_1006368.jpg                12-34_55556677_88888888888.jpg          Where 1 = site: A=Aeolian: D=Dona Ana; G=Gravelly Ridges                2 = plot (1-8)                3 = microplot... more
Dataset ID: 210308005


Original Investigator: David Lightfoot
Data contact: Robert L Schooley
Duration: 1995 - 2005
Abstract: A creosotebush shrub study site and a black grama grassland study site have been established at each of the Sevilleta, Jornada and Mapimi research locations. Each study site is 1 km by 0.5 km in area. Three replicate experimental blocks of plots are randomly located at each study site to measure vegetation responses to the exclusion of small mammals, including rodents and lagomorphs. This dataset is for the Jornada Experimental Range, which also contains a cattle exclosure.  A grid of 36 sampling points are positioned at 5.8-meter intervals on a systematically located 6 by 6 point grid within each plot. A permanent one-meter by one-meter vegetation measurement quadrat is located at each of the 36 points. The percent of a quad covered in cryptograms was estimated by determining the percent... more
Dataset ID: 210086003


Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: *We have hypothesized that large rhizobial population densities can occur at considerable depths in woody legume systems where deep moisture also occurs. However, associated with deep soil environments are low concentrations of soil nutrients that might affect nodulation and also limit survival of free-living rhizobia. The objectives of this study were to (1) determine if results from a previous study of a mesquite woodland utilizing groundwater in the Californian Sonoran desert were generizable to mesquite systems in other deserts where root depth varied with ecosystem type and (2) examine possible relationships of soil properties and host-plant phenology to rhizobial concentrations. Data set contains analyses for SO4, sodium, calcium, manganese, sodium-absorption-ration, total cations,... more
Dataset ID: 210394005


Data file: File mcmicron.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Soil cores were collected under mesquite (Prosopis glandulosa) trees at playa, wash, sand dune, and grassland sites on the Jornada LTER site to depths of 15, 9, 7, and 4 m. Soil cores (to 4 m) were also taken under creosote bush (Larrea tridentata) near the wash site. Soils were extracted and analyzed for micronutrients, Zn, Cu, Fe, and Mn.
Dataset ID: 210394002


Data file: File mcwsf86.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: *We have hypothesized that large rhizobial population densities can occur at considerable depths in woody legume systems where deep moisture also occurs. However, associated with deep soil environments are low concentrations of soil nutrients that might affect nodulation and also limit survival of free-living rhizobia. The objectives of this study were to (1) determine if results from a previous study of a mesquite woodland utilizing groundwater in the Californian Sonoran desert were generizable to mesquite systems in other deserts where root depth varied with ecosystem type and (2) examine possible relationships of soil properties and host-plant phenology to rhizobial concentrations. Data set contains total nitrogen, total phosphorous,NH4-N, NO3-N, PO4-P, percent moisture, total roots,... more
Dataset ID: 210394004


Data file: File mcnmp.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Soil cores collected under mesquite (Prosopis glandulosa) trees at several sites and under Larrea at one site at the Jornada LTER were incubated to determine the N-mineralization potential.
Dataset ID: 210394003


Data file: File deepmite.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: **We addressed the question, are microarthropod assemblages present in soils throughout the rhizosphere of a deep-rooted desert plant? If microarthropods are present, what is the taxonomic and functional structure of that assemblage? The presence of a generalist microarthropod assemblage would suggest functional relationships among deep soil biota similar to the relationships documented in shallow soils. Data set consists of microarthropods and microarthropod numbers found at different soil depths associated with four mesquite ecosystems (playa, coppice dune, arroyo, and grassland).
Dataset ID: 210394001


Original Investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: The purpose of this investigation was to answer three general questions: 1. How does the modification of soil properties and the ratios of resources (e.g., water-N) by ants alter species assemblages of winter annual plants at the edge of the ant nests? 2. How does the "spring cleaning", clipping, predation or herbivory by ants affect success of the winter annual plants at the edge of ant nests? 3. Are there significant differences in the floristic assemblage and belowground standing crop (root biomass) between the edge of ant nest and the surrounding unaffected soils? Data set contains density and cover of all winter annual plants measured at regular intervals. Density is expressed as the number of individuals of a species per square meter. The cover of each species was calculated as the... more
Dataset ID: 210368001


Original Investigator: John Anderson
Data contact: John Anderson
1992 - ongoing
Abstract: This primary purpose of this data set is to validate the LTER Weather Station tipping bucket rain gauge data. The dipstick rain gauge (DSRG) data is measured at least weekly during scheduled maintenance trips to the LTER Weather Station to maintain the evaporation pan water levels. During the summer months this may be twice a week. Additionally, DSRG data is collected after any rain event that requires the collection of the Wetfall/Dryfall precipitation buckets which are located about 10 meters from the DSRG. This is usually any amount greater than 0.02". DSRG data is also collected after very small events when personnel are in the vicinity.
Dataset ID: 210126003


Original Investigator: William H Schlesinger
Data contact: John Anderson
1983 - ongoing
Abstract: Dry atmospheric fallout (dryfall) is collected monthly using an Aerochem Metrics wetfall/dryfall collector located at the LTER weather station. Each sample is analyzed for NO3, NH4, Cl, SO4, Ca, Mg, Na, K, Total N, & Total P.
Dataset ID: 210169001


Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1982 - 1992
Abstract: BACKGROUND. In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). The exclosure lies along a northeast facing piedmont slope at the base of a steep isolated mountain peak, and covers a variety... more
Dataset ID: 210120002


Original Investigator: Brandon Bestelmeyer
Data contact: Robert L Schooley
2004 - ongoing
Abstract:    OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation translate    into pulses of plant above ground net primary productivity (NPP) and how the small mammal    community responds to such changes also in relation to shrub gradient across the landscape.    Particularly we are interested in how the energy flows through the ecosystem in response to    pulses of rain.    HYPOTHESES:    1) Small mammal abundance should respond positively to precipitation and NPP.    2) On a temporal scale, the small mammal energy use should show parallel fluxes along the       shrub gradient.    Variables measured:  Rodent abundance expressed as Minimum Number Known Alive (MNKA),                         rodent biomas, rodent energy, and rodent species richness.
Dataset ID: 210262010


Original Investigator: Brandon Bestelmeyer
Data contact: Robert L Schooley
2004 - ongoing
Abstract:    OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation translate into    pulses of plant above ground net primary productivity (NPP) and how the small mammal community    responds to such changes also in relation to shrub gradient across the landscape.  Particularly    we are interested in how the energy flows through the ecosystem in response to pulses of rain,    how the small mammal community partition resources (in terms of C3 (forbs and shrubs) and C4    (grasses) plants) and how the genetic structure of some species (i.e.:  Dipodomys spp.) is    affected by their population dynamics.    HYPOTHESES:    1) Small mammal abundance should respond positively to precipitation and NPP.    2) On a temporal scale, the small mammal energy use should show... more
Dataset ID: 210262008


Original Investigator: Brandon Bestelmeyer
Data contact: Brandon Bestelmeyer
2005 - ongoing
Abstract:    Dataset consists of the annual aboveground net primary production (ANPP) across 3    habitats grouped by plant form and total ANPP.  The habitats are grassland, mesquite    shrubland, and the ecotone between the 2. The plant forms are winter annual forb,    annual forb, bi-annual forb, perennial forb, annual grass, perennial grass, shrub, and    sub-shrub.    OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation    translate into pulses of plant aboveground net primary productivity (NPP) and how the    small mammal community responds to such changes also in relation to shrub gradient    across the landscape.  Particularly we are interested in how the energy flows through    the ecosystem in response to pulses of rain, how the small mammal community... more
Dataset ID: 210262004


Original Investigator: Brandon Bestelmeyer
Data contact: Brandon Bestelmeyer
2008 - ongoing
Abstract:    Dataset consists of the annual aboveground net primary production (ANPP) across 3    habitats grouped by plant form and total ANPP.  The habitats are grassland, mesquite    shrubland, and the ecotone between the 2. The plant forms are winter annual forb,    annual forb, bi-annual forb, perennial forb, annual grass, perennial grass, shrub, and    sub-shrub.    OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation    translate into pulses of plant aboveground net primary productivity (NPP) and how the    small mammal community responds to such changes also in relation to shrub gradient    across the landscape.  Particularly we are interested in how the energy flows through    the ecosystem in response to pulses of rain, how the small mammal community... more
Dataset ID: 210262005


Original Investigator: Brandon Bestelmeyer
Data contact: Brandon Bestelmeyer
2008 - ongoing
Abstract:    Dataset consists of plant measurements used to calculate the annual aboveground net     primary production (ANPP) across 3 habitats grouped by plant form and total ANPP.      The habitats are grassland, mesquite shrubland, and the ecotone between the 2. The     plant forms are winter annual forb, annual forb, bi-annual forb, perennial forb,     annual grass, perennial grass, shrub, and sub-shrub.    OBJECTIVE:  The purpose of the study is to investigate how pulses of precipitation    translate into pulses of plant aboveground net primary productivity (NPP) and how the    small mammal community responds to such changes also in relation to shrub gradient    across the landscape.  Particularly we are interested in how the energy flows through    the ecosystem in response to pulses of... more
Dataset ID: 210262001


Data file: File bdpanveg.dat
Original Investigator: Laura Huenneke
Data contact: John Anderson
1998 - ongoing
Abstract: Overview: In semiarid ecosystems the diversity of plant functional types ( grasses, shrubs, succulents, and so on) and of species may interact with the severe stresses imposed by the desert environment to influence ecosystem processes. Erosion and transport of surface sediment by wind and water is one process that may be affected by the physical structure of the plant community. The Jornada plant diversity experiment, in which the diversity and structure of the plant community have been manipulated in large (25 m x 25 m) plots, offers the opportunity to examine the relative importance of vegetation characteristics and landscape position in determining rates of sediment movement within the plots. Each of the 48 plots of the plant diversity experiment contains 5 pans or trays on the... more
Dataset ID: 210121002


Original Investigator: Jin Yao
Duration: 1980 - 2010
Abstract: Estimated daily precipitation is calculated for each of 15 aboveground net primary productivity (ANPP) sites located in the 5 dominant vegetation zones on the Jornada Basin. The 15 sites were formally established in 1989 as LTER Study 268, but these rainfall estimates begin in 1980 using the closest rain gauge that provides a minimum resolution of daily precipitation data. The Methodology section describes this in detail. The rain gauges are detailed inthe file raingauge_picks.csv.
Dataset ID: 210425001


Original Investigator: Ross Virginia
Duration: 1988 - 1989
Abstract: Five mesquite dunes were irrigated by pumping water from a storage tank located 200 m away. Five nonirrigated dunes served as control. Soil samples were collected from mesquite trees at control and watered sites, and analyzed for the number of rhizobia nodules. This study is complete.
Dataset ID: 210386004


Original Investigator: Walter G Whitford
Data contact: John Anderson
1983 - ongoing
Abstract: Surface evaporation is measured weekly to twice weekly using an evaporation pan compatible with standard National Weather Service evaporation measurements. Measurements are made twice per week during hot periods because of high evaporation rate. The following data is collected: number of days between measurements, beginning and ending measurement period, current, minimum, and maximum water temperature; initial water level; final water level; rainfall since last evaporation measurement, and calculated evaporation (inches).
Dataset ID: 210127001


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: A mesocosm experiment was conducted on fluff grass (Erioneuron pulchellum) plants to look at the effect of exclusion of mites (with chlordane), nematodes (NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen.
Dataset ID: 210385001


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Measurements are taken on Erioneuron pulchellum at monthly intervals. Three randomly located subsamples are collected from each plot. Data set contains plant diameters, mites soil weight, root weight, nematode soil weight, root total nitrogen, and nematode number.
Dataset ID: 210385007


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: This data set consists of periodic size measurements of permanently marked individual fluff grass plants. Measurements were taken in March, July, and September 1986. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Three randomly located subsamples were taken from each plot.
Dataset ID: 210385004


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Dry weight biomass and total nitrogen were determined for flowers, green leaves and yellow and grey leaves of fluffgrass plants collected from plots. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment).
Dataset ID: 210385003


Data file: File soil_tn.dat
Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Soil total Nitrogen was determined in the rhizosphere of fluffgrass.
Dataset ID: 210385008


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: An ion exchange resin bag technique (Binkley 1984, Lajtha 1988) was used to determine N availability in the rhizosphere of fluffgrass. Ion exchange resin bags were used to determine NO3. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). 8 AN-bags were placed in the rhizosphere of a fluffgrass in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for NO3.
Dataset ID: 210385005


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: An ion exchange resin bag technique (Binkley 1984, Lajtha 1988) was used to determine N availability in the rhizosphere of fluffgrass. Ion exchange resin bags were used to determine NH4. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Two CA-bags were placed in the rhizosphere of a fluffgrass in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for NO3.
Dataset ID: 210385006


Original Investigator: Solange I Silva
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Nitrogen mineralization potential of soil rhizosphere of Erioneuron pulchellum from Silva\'s dissertation research plots. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment). Three randomly located subsamples were taken from each plot consisting of a fluff grass plant and a soil core 10 cm in diameter and 15 cm deep centered on each plant. [taken from page 11 of dissertation]
Dataset ID: 210385002


Data file: File lvarthr.dat
Original Investigator: David Lightfoot
Data contact: John Anderson
Duration: 1985 - 1986
Abstract: *We conducted a field study to test the hypothesis that creosotebush (Larrea tridentata) shrubs growing in naturally nutrient-rich sites had better quality foliage and supported greater populations of foliage arthropods than shrubs growing in nutrient-poor sites. This is data for foliage arthropods sampled from Lm LVAR creosotebush shrubs. Sampling was done in April of 1985 and 1986. Shrubs were sampled from 5 separate sites, designated A-E. 10 shrubs of 3 different selected types, random = R, high quality = H, low quality = L, were sampled at each site. Total numbers of individuals of each of the common species of foliage arthropods from each of the 30 shrubs/site are listed.
Dataset ID: 210369002


Data file: File grmesmin.dat
Original Investigator: Fred Fisher
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Soil samples collected 5/12 and 5/13/86 to survey N availability in a variety of grassland and mesquite habitats. Objective is development of hypotheses about desertification processes that degrade grassland into mesquite dominated ecosystems. Measurements made of inorganic soil nitrogen.
Dataset ID: 210395001


Original Investigator: David Lightfoot
Duration: 1983 - 1985
Abstract: This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.
Dataset ID: 210370001


Original Investigator: David Lightfoot
Duration: 1983 - 1985
Abstract: This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.
Dataset ID: 210370001


Original Investigator: David Lightfoot
Duration: 1983 - 1985
Abstract: This grasshopper data was collected from 9 plots on the east bajada of the Dona Ana Mts. Three plots were situated on the bajada parallel to and 200 m south of the LTER transect. Two additional sets of three plots were located 5 km and 10 km south of the LTER transect. Each plot is composed of two 50 m belt transects, each divided into ten 5 m2 quadrats. Grasshoppers were visually sampled in each quadrat/plot, once in May, July and September, in 1983, 1984 and 1985. Each individual grasshopper was recorded, including species, age, sex and substrate where it was found. This study is complete.
Dataset ID: 210370001


Original Investigator: Jane Smith
Data contact: John Anderson
Duration: 2010 - 2012
Abstract: Soil organic carbon (SOC) is derived primarily from the decomposition of plant biomass. Animals that create greenfall, or green leaf litter, influence SOC dynamics by altering the phenological condition and, therefore, nutrient quality of plant litter. Animals that transport greenfall to a microsite with different microhabitat conditions from those where senesced litter would typically be found also influence SOC dynamics by altering the prevalence of various decomposition drivers. Microsite differences are particularly pronounced in arid and semi-arid ecosystems with heterogeneous vegetation cover. We investigated differences in decomposition between greenfall and senesced litter of three common Chihuahuan Desert plants from which animals frequently generate greenfall (Larrea tridentata... more
Keywords:
Dataset ID: 210327001


Original Investigator: Heather Throop
Data contact: John Anderson
Duration: 2010 - 2012
Abstract: Soil organic carbon (SOC) is derived primarily from the decomposition of plant biomass. Animals that create greenfall, or green leaf litter, influence SOC dynamics by altering the phenological condition and, therefore, nutrient quality of plant litter. Animals that transport greenfall to a microsite with different microhabitat conditions from those where senesced litter would typically be found also influence SOC dynamics by altering the prevalence of various decomposition drivers. Microsite differences are particularly pronounced in arid and semi-arid ecosystems with heterogeneous vegetation cover. We investigated differences in decomposition between greenfall and senesced litter of three common Chihuahuan Desert plants from which animals frequently generate greenfall (Larrea tridentata... more
Keywords:
Dataset ID: 210327001


Original Investigator: Dale A Gillette
Data contact: Greg Okin
1998 - ongoing
Abstract: Collections of airborne sand are obtained at the 15 NPP sites and the Geomet site. The collections are taken using BSNE collectors. The collectors are turned into the wind with wind vanes. The amount of material collected corresponds to the horizontal flux at the height of the collector and the opening area of the collector and the duration of the sampling time. The five heights of the BSNE collectors above the soil surface are 5, 10, 20, 50, and 100 centimeters for every location where samples are taken. The hypothesis of the experiment is that the vertical flux of the particles smaller than 10 micrometers is a constant ratio of the horizontal sand flux. The objectives of the experiment are to find patterns of sand flux rates as affected by soil and vegetation.
Dataset ID: 210288001


Original Investigator: Dale A Gillette
Data contact: Greg Okin, Data contact: John Anderson
Duration: 1998 - 2019
Abstract: Collections of airborne sand are obtained at the 15 NPP sites and the Geomet site. The collections are taken using BSNE collectors. The collectors are turned into the wind with wind vanes. The amount of material collected corresponds to the horizontal flux at the height of the collector and the opening area of the collector and the duration of the sampling time. The five heights of the BSNE collectors above the soil surface are 5, 10, 20, 50, and 100 centimeters for every location where samples are taken. The hypothesis of the experiment is that the vertical flux of the particles smaller than 10 micrometers is a constant ratio of the horizontal sand flux. The objectives of the experiment are to find patterns of sand flux rates as affected by soil and vegetation.
Dataset ID: 12345


Original Investigator: Dale A Gillette
Data contact: John Anderson
2008 - ongoing
Abstract: Dataset consists of horizontal dust flux at multiple heights from BSNE dust collectors located in treatment plots (different percent vegetation removed) and adjacent downwind effect plots. Year 2008 was an annual collection. Collection in subsequent years occurred before and after the wind season. The experiment was designed to test the effects of increasing wind erosion on soil and vegetation properties at the Jornada.  In order to increase wind erosion rates, vegetation was removed to increase bare surface area and stimulate erosion (the less vegetation present the greater the wind erosion).  The basic experimental design includes three treatment blocks.  Each block has four treatment plots with different level of vegetation removed (25-100%) and a control treatment.  Treatment plots... more
Dataset ID: 210228001


Original Investigator: Ryan Templeton
2008 - ongoing
Abstract: This files presents all of the flux data post-EdiRe processing at 30 minute resolution.  Included in this file is: Ux = Mean wind speed in the x-direction, Uy = mean wind speed in the y-direction, Uz = mean wind speed in the z-direction, Co2 = CO2 atmospheric concentrations, H2O = Water atmospheric concentrations, Press = barometric pressure, Air Temp = atmospheric temperature, wind speed = mean wind speed towards 216 degrees from north, H Flux = sensible heat flux, LE Flux = latent heat flux, C Flux = carbon flux.
Dataset ID: 210338001


Original Investigator: Tim Ward
Data contact: John Anderson
Duration: 1982 - 1994
Abstract: OVERVIEW This is the Jornada Long Term Ecological Research site data base for the 2 x 2 meter natural rainfall-runoff plots. There are 4074 plot-events or observations in the data set. Of those 4074 observations, 2745 contained precipitation values greater than zero or contained precipitation values greater than runoff values. Very few observations showed runoff values greater than precipitation. All values are included here for completeness of the data set. These data were collected and analyzed in the laboratory under the supervision of John Anderson (primarily). Dr. Susan M. Bolton and Dr. Tim J. Ward compiled and checked the data. Tim J. Ward is responsible for the final input, checking and presentation of the data set presented below. Questions about the data should be directed to... more
Dataset ID: 210001002


Original Investigator: William Ridgely Chapline
Data contact: Darren James
1915 - ongoing
Abstract: The data set, along with other long-term data collected at multiple spatial scales, is being used to identify the landscape, climatic, and anthropogenic factors that influence grass abundance, growth, and persistence. Variables measured are basal area of grasses, canopy area of shrubs, and perimeters of both.
Dataset ID: 210351001


Original Investigator: William Ridgely Chapline
Data contact: Darren James
1915 - ongoing
Abstract: The data set, along with other long-term data collected at multiple spatial scales, is being used to identify the landscape, climatic, and anthropogenic factors that influence grass abundance, growth, and persistence. Variable measured is plant density by species.
Dataset ID: 210351002


Original Investigator: Kris Havstad
1916 - ongoing
Abstract: Stocking rates for cattle, horses, and sheep are provided for the Jornada Experimental Range beginning in 1916. Goats were few and are included as part of the sheep category and not differentiated.
Dataset ID: 210412001


Original Investigator: Ken A Valentine
Duration: 1939 - 2001
Abstract: The purpose of this study is to quantify vegetation dynamics in response to lagomorph and shrub exclusion. Data consist of vertical line intercept measures of the perennial grasses, suffretescents and shrubs. Sixteen plots at each of 3 sites (Gravelly Ridges, Dona Ana exclosure, and Parker Tank) were established in 1938-39 by Ken Valentine. Plots were 21.3 x 21.3 m in 4 rows of 4 plots with a 7.6 m buffer zone. All plots were sampled before treatments. Plots were divided into east and west halves and 14 randomly located 10.65 m transects were located in each half plot. Vegetation (black grama, dropseeds, bush muhly, fluff grass, other grasses, creosotebush, honey mesquite, tarbush, mariola, and other shrubs) was measured using vertical line point intercepts. Plots have been re-read in... more
Dataset ID: 210392001


Original Investigator: David Lightfoot
Duration: 1989 - 2006
Abstract: In conjunction with net primary production studies, consumer and faunal studies were conducted at or near NPP sites using pitfall traps. We used live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement was used with the lizards. Variables measured included species, sex, recapture status, snout-vent length, total length, weight, and whether tail was broken or whole. This study is complete.
Dataset ID: 210007001


Original Investigator: David Lightfoot
Duration: 1989 - 2006
Abstract: In conjunction with net primary production studies, consumer and faunal studies were conducted at or near NPP sites using pitfall traps. We used live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement was used with the lizards. Variables measured included species, sex, recapture status, snout-vent length, total length, weight, and whether tail was broken or whole. This study is complete.
Dataset ID: 210007001


Original Investigator: John Anderson
Data contact: John Anderson
1983 - ongoing
Abstract: Daily summary values of averages of readings of the following parameters are made which are based on data recorded on a Campbell CR10(X) data logger: maximum, minimum, and average air temperature; maximum and minimum relative humidity; total precipitation; average wind speed; maximum wind speed; average wind direction; total incoming solar radiation; average soil temperature at 5cm and 20cm; mean dew temperature. From 1983 - 5 June 1991, readings on which daily averages are based were made at 12 second intervals. From 6 June 1991 to present, readings on which daily averages are based are made at 10 second intervals.
Dataset ID: 210126001


Original Investigator: John Anderson
Data contact: John Anderson
1983 - ongoing
Abstract: Daily summary values of averages of readings of the following parameters are made which are based on data recorded on a Campbell CR10(X) data logger: maximum, minimum, and average air temperature; maximum and minimum relative humidity; total precipitation; average wind speed; maximum wind speed; average wind direction; total incoming solar radiation; average soil temperature at 5cm and 20cm; mean dew temperature. From 1983 - 5 June 1991, readings on which daily averages are based were made at 12 second intervals. From 6 June 1991 to present, readings on which daily averages are based are made at 10 second intervals.
Dataset ID: 210126001


Original Investigator: John Anderson
Data contact: John Anderson
1983 - ongoing
Abstract: Hourly summary values of averages of readings of the following parameters are made which are based on data recorded on a Campbell CR10(X) data logger: maximum, minimum, and average air temperature; maximum and minimum relative humidity; total precipitation; average wind speed; maximum wind speed; average wind direction; total incoming solar radiation; average soil temperature at 5cm and 20cm; mean dew temperature. From 1983 - 5 June 1991, readings on which hourly averages are based were made at 12 second intervals. From 6 June 1991 to present, readings on which hourly averages are based are made at 10 second intervals.
Dataset ID: 210126002


Data file: File mesomite.dat
Original Investigator: John Anderson
Duration: 1986 - 1987
Abstract: A mesocosm experiment was conducted on fluff grass plants to look at the effect of exclusion of mites (with chlordane), nematodes (with NEMACUR), mites and nematodes, on soil available, total and microbial nitrogen. Numbers of microarthropods per 1000g of soil is recorded in this data file.
Dataset ID: 210385009


Data file: File mesqarth.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1988 - 1988
Abstract: This is data for foliage arthropods sampled from mesquite shrubs. Total numbers of taxa and individuals of each major trophic group, herbivores, predators, and omnivores are listed.
Dataset ID: 210386006


Data file: File mesqphen.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1988 - 1988
Abstract: Data consists of mesquite phenology components.
Dataset ID: 210386007


Data file: File rtsoil.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: [Mesquite root tube soil nutrients from soil cores collected under mesquite (Prosopis glandulosa) at the dune, playa, and grassland sites. Data consists of NO3, NH4, and soil H2O (percent).]
Dataset ID: 210386011


Data file: File rtmite.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: [Soil mite numbers associated with soil cores collected under mesquite {Prosopis glandulosa) at the dune, playa and grassland sites.]
Dataset ID: 210386010


Data file: File prosnp86.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Mesquite tissues (leaf, stem, flowers, pods) were collected in conjunction with phenology studies and natural abundance of N15 during 1986 and 1987. These were digested and analyzed for total nitrogen (Kjeldahl) and total phosphorous.
Dataset ID: 210386008


Data file: File prosnp87.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1987 - 1987
Abstract: Mesquite tissues (leaf, stem, flowers, pods) were collected in conjunction with phenology studies and natural abundance of N15 during 1986 and 1987. These were digested and analyzed for total Kjeldahl nitrogen and total phosphorous.
Dataset ID: 210386009


Original Investigator: Laura Huenneke
Data contact: John Anderson
1989 - ongoing
Abstract: A 4" diameter cylindric graduated rain gage (11" x 0.01" capacity) is mounted on a 4x4 inch diameter redwood post or on a wooden exclosure post next to gate at or near the 15 LTER-II NPP sites. Collection is made monthly on the day that monthly soil water content measurements are made to correlate precipitation input with belowground water content. Data is collected primarily from graduated rain gauges. However, when missing data would result otherwise, amounts from the closest rain gauge are used in order to maintain as complete a data set as possible for that site. The rain gauge used is identified with each rainfall record. Other types that may be used are the Standard Can Gauge (DSRG or dipstick rain gauge), Belfort Weigh Bucket Rain Gauge (WBRG), and Qualimetrics Tipping Bucket Rain... more
Dataset ID: 210002001


Original Investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: David Thatcher
1915 - ongoing
Abstract: This ongoing dataset contains monthly precipitation measurements from a network of standard can rain gauges at the Jornada Experimental Range in Dona Ana County, New Mexico, USA. Precipitation physically collects within gauges during the month and is manually measured with a graduated cylinder at the end of each month. This network is maintained by USDA Agicultural Research Service personnel. This dataset includes 39 different locations but only 29 of them are currently sampled. Other precipitation data exist for this area, including event-based tipping bucket data with timestamps, but do not go as far back in time as this dataset.
Dataset ID: 210038001


Data file: File nh3vol89.dat
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1989 - 1989
Abstract: Ammonia volatilization was measured at three sites in the Chihuahuan Desert of southern New Mexico, U.S.A. In dry soils, ammonia volatilization ranged from 9 to 11 micrograms of nitrogen per square meter per day, but rates increased to 95 micrograms of nitrogen per square meter per day in a shrubland site after an experimental addition of water. Ammonia volatilization also increased with experimental additions of NH4Cl and decreased with additions of sucrose. Competition by nitrifiers for available NH4+ had little effect on NH3 volatilization: N-Serve, added to inhibit nitrification, decreased NH3 volatilization in a grassland site and had little effect at other sites. We suggest that NH3 volatilization is controlled by the rate of mineralization of NH4+ from soil organic matter, and... more
Dataset ID: 210393002


Original Investigator: John Anderson
Data contact: John Anderson
Duration: 1989 - 1990
Abstract: Plant nutrient distribution beneath and between plant canopies in the Mesquite, Grassland, Playa, Creosotebush, and Tarbush plant communities. The LTER plant biomass plots were harvested during spring, fall, 1989 and winter 1990, in 5 vegetation zones (Mesquite, Grassland, Playa, Creosotebush, Tarbush), 3 sites per zone (site with low, medium, and high biomass, ranked based on fall-89 biomass). Samples were analyzed for total Kjeldahl N, and total phosphorus. Site ranking based on Fall 1989 biomass estimates: ZONE SITES BIOMASS (using FALL-89 rank of plant) M RABB low M NORT medium M WELL high G IBPE low G SUMM medium G BASN high P TABO low P COLL medium P SMAL high C CALI low C GRAV medium C SAND high T WEST low T TAYL medium T EAST high
Dataset ID: 210029001


Original Investigator: Wesley Jarrell
Data contact: John Anderson
Duration: 1989 - 2011
Abstract:         NOTE: 1. This dataset should only be used as a reference from this                           point forward (12/14/2071).                     2. This dataset has been replaced by the NPP Soil Volumetric                          Water Content dataset                          (https://jornada.nmsu.edu/content/soil-volumetric-water-content-15-npp-sites-jornada-basin-lter-1989).                         which contains the recalculated VWC values in addition to the                          adjusted raw count data from the hydroprobe. Once a month soil water content measurements are made at 10 depths (where possible) at each of 10 access tubes at each of the 15 LTER-II sites using a neutron probe (Campbell Model 503DR Hydroprobe). Measurements are taken at 30cm, 60cm, 90cm, 120cm, 150cm... more
Dataset ID: 210013002


Original Investigator: Wesley Jarrell
Data contact: John Anderson
Duration: 1989 - 2014
Abstract:         NOTE: 1. This dataset should only be used as a reference from this                           point forward (12/14/2071).                     2. This dataset has been replaced by the NPP Soil Volumetric                          Water Content dataset                          (https://jornada.nmsu.edu/content/soil-volumetric-water-content-15-npp-sites-jornada-basin-lter-1989).                         which contains the recalculated VWC values in addition to the                          adjusted raw count data from the hydroprobe. Once a month soil water content measurements are made at 10 depths (where possible) at each of 10 access tubes at each of the 15 LTER-II sites using a neutron probe (Campbell Model 503DR Hydroprobe). Measurements are taken at 30cm, 60cm, 90cm, 120cm, 150cm... more
Dataset ID: 210013001


Original Investigator: Laura Huenneke
Data contact: John Anderson
1989 - ongoing
Abstract: Summarizes mean aboveground net primary production, in g/m2/yr, by year for each of 15 sites. Annual totals derived by summing seasonal production values for winter (October - February), spring (February - May), and fall (May - October) increments for a single calendar year. Please refer to these publications to evaluate the appropriateness of these data for your intended use prior to contacting Debra Peters, Responsible Investigator, with a data request. Peters, Debra P. C., Jin Yao, Osvaldo E. Sala, and John P. Anderson. 2012. Directional climate change and potential reversal of desertification in arid and semiarid ecosystems. Global Change Biology 18, no. 1 151-63. doi 10.1111/j.1365-2486.2011.02498.x. Peters, Debra P. C., Jin Yao, Dawn Browning, and Albert Rango. 2014. Mechanisms... more
Dataset ID: 210011003


Original Investigator: John Anderson
Data contact: John Anderson
1996 - ongoing
Abstract: Beginning in 1996, annual photos are taken from each of the 4 corners of each of the 15 70-meter x 70-meter NPP sites between August and November depending on other research activity constraints. The plots were established in early months of 1989. From 1996-2002 photos were taken using 35mm color slide film. Beginning in 2003, digital photos were taken in JPG format. Occasionally, supplemental photos may be taken at the same time that provide additional habitat information at the landscape, patch, or plant species level
Dataset ID: 210011005


Original Investigator: Laura Huenneke
Data contact: John Anderson
1989 - ongoing
Abstract: These data sets contain calculated aboveground biomass values, by species, for each quadrat in each site for a given season. They are constructed (as outlined below) from the field data which are measurements of the physical dimensions (horizontal cover, vertical height) of plants or plant parts in the quadrats. Objective is to monitor patterns (both temporal and spatial) of aboveground biomass across a range of ecosystem types; to allow the estimation of net primary production and its variability in those ecosystems; and to provide a quantitative description of plant community structure over time in those ecosystems. Please refer to these publications to evaluate the appropriateness of these data for your intended use prior to contacting Debra Peters, Responsible Investigator, with a... more
Dataset ID: 210011001


Original Investigator: Laura Huenneke
Data contact: John Anderson
1989 - ongoing
Abstract: Standing biomass is sampled three times a year: in winter (February - March), before shrubs begin spring growth; in spring (May), when shrubs and spring annuals have reached peak biomass; in fall (late summer; October), when summer annuals have reached peak biomass but before killing frosts. At each sample date, each site is visited (order of sampling may vary, according to phenological stage of sites) and the dimensions of each plant on each quadrat are measured and recorded. Recorded for each observation are: date, zone, plot, quadrat #, species (4 letter acronym), observation # (one for each measurement of that species in that quadrat), cover (percentage of quadrat covered by canopy of that individual or species), height (vertical extent of that individual or species), count (if... more
Dataset ID: 210011002


Original Investigator: Laura Huenneke
Data contact: John Anderson
1989 - ongoing
Abstract: This is the reference harvest biomass data of plants near, but outside the grid of permanent NPP quadrats that was harvested for each of 15 sites. Height and cover are recorded in the field. Live biomass is weighed in the lab and all measurements are recorded as reference harvest data. The NPP sites are grids of permanent 1 square meter quadrats established in 15 sites: three sites in each of 5 community zones (grama grassland, creosotebush scrub, tarbush flats, mesquite dunes and playa). Grids consist of 49 quadrats arranged in a square 7 x 7 pattern, with quadrats 10 m apart (P-COLL has 48 quadrats in a 3 x 16 pattern).
Dataset ID: 210011004


Data file: File jornsol5.dat
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1995 - 1996
Abstract: This data set was collected to provide data for comparison of the losses of dissolved nitrogen and phosphorus in the runoff from grass- and shrub- dominated plots in the Jornada Basin of southern New Mexico. This dataset contains the following columns: Plot: the identification number for the plots, which are grouped for grass, shrub or intershrub areas. Fill Time: the time in seconds used to collect an individual sample of discharge from the plot. Time: the time in minutes (from the beginning of the rainfall simulation) at which each individual collection of discharge began. In each case, the first time listed is the time at which discharge was first observed. Time b/w samples: the time in seconds between the beginning the collection of a given sample of discharge and the beginning of the... more
Dataset ID: 210381001


Data file: Binary Data grasssum.sum
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1995 - 1996
Abstract: This data set was collected to provide data for comparison of the losses of dissolved nitrogen and phosphorus in the runoff from grass- and shrub- dominated plots in the Jornada Basin of southern New Mexico. This summary dataset contains the following columns for the grassland plots: Plot: the identification number for the 6 grassland plots. Q: the mean rate of discharge during the entire experiment, obtained by dividing the total runoff by l800 sec. The units are cubic centimeters per second. Total N yield: the total yield of dissolved nitrogen discharged from the plot during the duration of the experiment. The units are grams per square meter per l800 sec. This yield has been adjusted, by subtracting the content of total dissolved N applied in the simulated rainfall. Organic N yield:... more
Dataset ID: 210381002


Data file: Binary Data intersum.sum
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1995 - 1996
Abstract: This data set was collected to provide data for comparison of the losses of dissolved nitrogen and phosphorus in the runoff from grass- and shrub- dominated plots in the Jornada Basin of southern New Mexico. This summary dataset contains the following columns for the intershrub plots: Plot: the identification number for the 6 grassland plots. Q: the mean rate of discharge during the entire experiment, obtained by dividing the total runoff by l800 sec. The units are cubic centimeters per second. Total N yield: the total yield of dissolved nitrogen discharged from the plot during the duration of the experiment. The units are grams per square meter per l800 sec. This yield has been adjusted, by subtracting the content of total dissolved N applied in the simulated rainfall. Organic N yield:... more
Dataset ID: 210381003


Data file: Binary Data shrubsum.sum
Original Investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1995 - 1996
Abstract: This data set was collected to provide data for comparison of the losses of dissolved nitrogen and phosphorus in the runoff from grass- and shrub- dominated plots in the Jornada Basin of southern New Mexico. This summary dataset contains the following columns for the shrub plots: Plot: the identification number for the 6 grassland plots. Q: the mean rate of discharge during the entire experiment, obtained by dividing the total runoff by l800 sec. The units are cubic centimeters per second. Total N yield: the total yield of dissolved nitrogen discharged from the plot during the duration of the experiment. The units are grams per square meter per l800 sec. This yield has been adjusted, by subtracting the content of total dissolved N applied in the simulated rainfall. Organic N yield: the... more
Dataset ID: 210381004


Original Investigator: Walter G Whitford
Data contact: Darren James
1986 - ongoing
Abstract: This ongoing data set contains percent canopy cover estimates of perennial plant species from transects that cross a grazed/ungrazed boundary fenceline of a single exclosure on the New Mexico State University Chihuahuan Desert Rangeland Research Center in Dona Ana County, New Mexico, USA. In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4... more
Dataset ID: 210120001


Original Investigator: Heather Throop
Duration: 2007 - 2008
Abstract:   Increases in woody vegetation and declines in grasses in arid and semi-arid ecosystems have occurred globally since the 1800s, but the mechanisms driving this major land-cover change remain uncertain and controversial. Working in a shrub-encroached grassland in the northern Chihuahuan Desert where grasses and shrubs typically differ in leaf-level nitrogen allocation, photosynthetic pathway, and root distribution, we asked if differences in leaf level ecophysiology could help explain shrub proliferation. We predicted that the relative performance of grasses and shrubs would vary with soil moisture due to the different morphological and physiological characteristics of the two life-forms. In a 2-year experiment with ambient, reduced,and enhanced precipitation during the monsoon season,... more
Dataset ID: 210409001


Original Investigator: Ross Virginia
Duration: 1988 - 1989
Abstract: Plant and soil samples were collected from mequite dunes sites which had not been irrigated (control)  or had been irrigated (treatment) with water. Soil samples were collected (hand augered) under mesquite (Prosopis glandulosa) trees  to three depths, 0-50 and 50-100, and 100-150cm. Soil samples were placed in plastic bags, tied, and stored in portable coolers. Soil samples were analyzed for zinc , cupper, iron, and manganese. Plant tissue was analyzed for total nitrogen and total phosphorous. This study has been completed.
Dataset ID: 210386003


Original Investigator: Tim Ward
Data contact: John Anderson
Duration: 1989 - 1990
Abstract:     This dataset quantities vegetation cover at experimental hydrology plots on the New Mexico State University Ranch and USDA Jornada Experimental Range. Plots were located in a zone dominated by creosotebush and a zone dominated by grassland. The goal was to compare nutrient losses between shrublands and grasslands. Plant Cover was measured on 20 2 x 2 m hydrology run off plots using quadrats with 10 x 10 cm units. The number of 10x10cm squares occupied each by plant species was counted and scaled up to determine the total percent cover of each species per plot. Best available judgement was used. For instance, dense grass cover of Bouteloua eriopoda was measured while a thin cover of leaves and stems that may have been present over an area was not. With the annual grasses that were... more
Dataset ID: 210001001


Original Investigator: Lara G Reichmann
Data contact: Osvaldo Sala
Duration: 2006 - 2009
Abstract: A 2-year experiment with ambient, reduced, and enhanced precipitation as well as nitrogen additions was designed to compare the performance of the  encroaching C3 shrub (honey mesquite Prosopis glandulosa) to the dominant C4 grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates and leaf water status. Precipitation manipulations dramatically enhanced natural variability and generated a range of rainfall scenarios that could have only been studied only after a multi-decade effort using natural conditions.We use vegetation cover as a proxy for plant biomass to avoid confounding spatial and temporal variability or confounding the impact of harvesting.  Individual cover of plant species was measured using three parallel transects per plot. This study is complete.
Dataset ID: 210278002


Data contact: Darren James
Duration: 2009 - 2014
Abstract: This ongoing dataset contains metrics of plant diversity, evenness, and richness from a study at the Jornada Experimental Range (JER) in southern New Mexico. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009, has five precipitation treatments (see Methods) and contains 50 plots (10 per treatment). This data package contains 6-year (2009 to 2014) means of metrics per plot. Annual and more recent data are available and will be released pending an upcoming publication. Meaures of plant diversity &  richness by treatment: https://jornada.nmsu.edu/sites/jornada.nmsu.edu/files/files/data/Div_Rich_figure.jpg EDI data location: https://portal.... more
Keywords:
Dataset ID: 210328002


Original Investigator: Laura Huenneke
Data contact: Dawn Browning
1992 - ongoing
Abstract: The phenological stage of all perennial plant species on the 15 NPP sites is recorded on a monthly basis. This allows us to track the influence of weather and of site differences on plant reproduction. The boundaries of the (80m x 80m) study plot are walked and each individual plant of any perennial species in a 1-m belt is examined and its phenology noted (non-reproductive, in bud, in flower, in fruit, or dormant).
Dataset ID: 210287001


Original Investigator: Heather Throop
Duration: 2007 - 2008
Abstract: Increases in woody vegetation and declines in grasses in arid and semi-arid ecosystems have occurred globally since the 1800s, but the mechanisms driving this major land-cover change remain uncertain and controversial. Working in a shrub-encroached grassland in the northern Chihuahuan Desert where grasses and shrubs typically differ in leaf-level nitrogen allocation, photosynthetic pathway, and root distribution, we asked if differences in leaf level ecophysiology could help explain shrub proliferation. We predicted that the relative performance of grasses and shrubs would vary with soil moisture due to the different morphological and physiological characteristics of the two life-forms. In a 2-year experiment with ambient, reduced,and enhanced precipitation during the monsoon season,... more
Dataset ID: 210409002


Original Investigator: Ryan Templeton
2010 - ongoing
Abstract: Precipitation at 1 minute intervals for rain gauges 2-5 with R1 excluded due to periods of interruption.  Spatially averaged rainfall over the watershed is calculated in this dataset based on relative coverage of each rain gauge determined from a Theissen polygon map.
Dataset ID: 210338002


Data file: File hwbrowtn.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: Rabbit browse (clippings) were collected from 24 5x5m plots at approximately 1 month intervals. Dry weight by date and plot was recorded. Plant material collected was subsampled and analyzed for Total N. Plots are located along LTER-I Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope (around station C48 and T46). (See site description.)
Dataset ID: 210373002


Data file: File hwbrowse.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1989
Abstract: Rabbit browsed (=clipped) plant material found lying on the ground was collected from 24 5x5m plots at approximately 1 month intervals. Dry weight by species, date and plot was recorded. Material was subsampled and analyzed for Total N. Plots are located along LTER-1 Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope. See site description.
Dataset ID: 210373001


Data file: File hwpellet.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1989
Abstract: Rabbit pellets were collected from 24 5x5m plots at approximately 1 month intervals. Dry weight by date and plot was recorded. Plots are located along LTER-1 Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope
Dataset ID: 210373003


Data file: File hwpelltn.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: Rabbit pellets were collected from 24 5x5m plots at approximately 1 month intervals. Dry weight by date and plot was recorded. Pellets were subsampled and analyzed for Total N. Plots are located along LTER-1 Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope. (See site description.) Plots are located along LTER-1 Control and Treatment transects in creosotebush (around station C62 and T61) and upper basin slope. (See site description.)
Dataset ID: 210373004


Data file: File rootchem.dat
Original Investigator: H T Mun
Data contact: John Anderson
Duration: 1986 - 1990
Abstract: *We designed a study to examine the long-term spatial and temporal patterns of mass loss, changes in nitrogen content and chemical composition during decomposition of roots in a desert watershed. Because nitrogen availability has been hypothesized to affect decomposition rates of buried litter in deserts, we studied decomposition of roots along a transect on a desert watershed that had been fertilized with ammonium nitrate and compared these results with the decomposition of roots along a transect that had not been fertilized.
Dataset ID: 210387001


Data file: File rootraw.dat
Original Investigator: H T Mun
Data contact: John Anderson
Duration: 1986 - 1990
Abstract: *We designed a study to examine the long-term spatial and temporal patterns of mass loss, changes in nitrogen content and chemical composition during decomposition of roots in a desert watershed. Because nitrogen availability has been hypothesized to affect decomposition rates of buried litter in deserts, we studied decomposition of roots along a transect on a desert watershed that had been fertilized with ammonium nitrate and compared these results with the decomposition of roots along a transect that had not been fertilized.
Dataset ID: 210387002


Data file: File rootwt.dat
Original Investigator: H T Mun
Data contact: John Anderson
Duration: 1986 - 1990
Abstract: *We designed a study to examine the long-term spatial and temporal patterns of mass loss, changes in nitrogen content and chemical composition during decomposition of roots in a desert watershed. Because nitrogen availability has been hypothesized to affect decomposition rates of buried litter in deserts, we studied decomposition of roots along a transect on a desert watershed that had been fertilized with ammonium nitrate and compared these results with the decomposition of roots along a transect that had not been fertilized.
Dataset ID: 210387003


Original Investigator: David Lightfoot
Data contact: Robert L Schooley
Duration: 1995 - 2007
Abstract: The purpose of this study is to determine whether or not the activities of small mammals regulate plant community structure, plant species diversity, and spatial vegetation patterns in Chihuahuan Desert shrublands and grasslands. What role if any do indigenous small mammal consumers have in maintaining desertified landscapes in the Chihuahuan Desert? Additionally, how do the effects of small mammals interact with changing climate to affect vegetation patterns over time? This study will provide long-term experimental tests of the roles of consumers on ecosystem pattern and process across a latitudinal climate gradient. The following questions or hypotheses will be addressed. 1) Do small mammals influence patterns of plant species composition and diversity, vegetation structure, and spatial... more
Dataset ID: 210086009


Original Investigator: David Lightfoot
Data contact: Robert L Schooley
1995 - ongoing
Abstract: Introduction. Animal consumers have important roles in ecosystems (Chew 1974, 1976), determining plant species composition and structure (Harper 1969, Pacala and Crawley 1992, Crawley 1983, 1989), regulating rates of plant production and nutrient cycling (Naiman 1988, McNaughton et al. 1989, Holland et al. 1992), and altering soil structure and chemistry (Milchunas et al. 1993, Huntly 1991). Desertification of semi-arid grasslands in the Southwest United States by domestic livestock provides an important example of herbivore regulation of ecosystem structure and function (Schlesinger et al. 1990). The species composition and physical structure of these desert grassland ecosystems were significantly altered by alien herbivores about 100 years ago (Bahre 1991, York and Dick-Peddie 1968,... more
Dataset ID: 210086004


Original Investigator: David Lightfoot
Data contact: Brandon Bestelmeyer
1995 - ongoing
Abstract: The purpose of this study is to determine whether or not the activities of small mammals regulate plant community structure, plant species diversity, and spatial vegetation patterns in Chihuahuan Desert shrublands and grasslands. What role if any do indigenous small mammal consumers have in maintaining desertified landscapes in the Chihuahuan Desert? Additionally, how do the effects of small mammals interact with changing climate to affect vegetation patterns over time? This study will provide long-term experimental tests of the roles of consumers on ecosystem pattern and process across a latitudinal climate gradient. The following questions or hypotheses will be addressed. 1) Do small mammals influence patterns of plant species composition and diversity, vegetation structure, and spatial... more
Dataset ID: 210086002


Original Investigator: David Lightfoot
Data contact: Robert L Schooley
1995 - ongoing
Abstract: Introduction. Animal consumers have important roles in ecosystems (Chew 1974, 1976), determining plant species composition and structure (Harper 1969, Pacala and Crawley 1992, Crawley 1983, 1989), regulating rates of plant production and nutrient cycling (Naiman 1988, McNaughton et al. 1989, Holland et al. 1992), and altering soil structure and chemistry (Milchunas et al. 1993, Huntly 1991). Desertification of semi-arid grasslands in the Southwest United States by domestic livestock provides an important example of herbivore regulation of ecosystem structure and function (Schlesinger et al. 1990). The species composition and physical structure of these desert grassland ecosystems were significantly altered by alien herbivores about 100 years ago (Bahre 1991, York and Dick-Peddie 1968,... more
Dataset ID: 210086005


Original Investigator: David Lightfoot
Data contact: John Anderson
1995 - ongoing
Abstract: Introduction. Animal consumers have important roles in ecosystems (Chew 1974, 1976), determining plant species composition and structure (Harper 1969, Pacala and Crawley 1992, Crawley 1983, 1989), regulating rates of plant production and nutrient cycling (Naiman 1988, McNaughton et al. 1989, Holland et al. 1992), and altering soil structure and chemistry (Milchunas et al. 1993, Huntly 1991). Desertification of semi-arid grasslands in the Southwest United States by domestic livestock provides an important example of herbivore regulation of ecosystem structure and function (Schlesinger et al. 1990). The species composition and physical structure of these desert grassland ecosystems were significantly altered by alien herbivores about 100 years ago (Bahre 1991, York and Dick-Peddie 1968,... more
Dataset ID: 210086007


Original Investigator: David Lightfoot
Data contact: Robert L Schooley
1996 - ongoing
Abstract: Introduction. Animal consumers have important roles in ecosystems (Chew 1974, 1976), determining plant species composition and structure (Harper 1969, Pacala and Crawley 1992, Crawley 1983, 1989), regulating rates of plant production and nutrient cycling (Naiman 1988, McNaughton et al. 1989, Holland et al. 1992), and altering soil structure and chemistry (Milchunas et al. 1993, Huntly 1991). Desertification of semi-arid grasslands in the Southwest United States by domestic livestock provides an important example of herbivore regulation of ecosystem structure and function (Schlesinger et al. 1990). The species composition and physical structure of these desert grassland ecosystems were significantly altered by alien herbivores about 100 years ago (Bahre 1991, York and Dick-Peddie 1968,... more
Dataset ID: 210086006


Original Investigator: David Lightfoot
Data contact: Brandon Bestelmeyer
Duration: 1995 - 2005
Abstract: This is data for perennial plant vegetation canopy cover measured from all SMES study plots, fall 1995. The purpose of this data is to provide ground-truth data for comparison with low-level aerial photographs of each study plot. Three, 29 meter lines were measured along three of six rows of the permanent vegetation measurement quadrats. Each line was measured at 10cm resolution for intercepts of perennial plant live canopy cover, and for bare ground. 10cm resolution is comparable to the resolution of the aerial photos. All plants were identified to the species level. These line-intercept measurements are taken once every ten years, at the same time that low-level aerial photographs are taken. These data will be compared to both decadal air photos, and annual measures of vegetation from... more
Dataset ID: 210086001


Data file: File bdsoiero.dat
Original Investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1996 - 1999
Abstract: [John Anderson added the following from info provided by Justin Van Zee and edited by Michelle Buonopane.] Overview: In semiarid ecosystems the diversity of plant functional types ( grasses, shrubs, succulents, and so on) and of species may interact with the severe stresses imposed by the desert environment to influence ecosystem processes. Erosion and transport of surface sediment by wind and water is one process that may be affected by the physical structure of the plant community. The Jornada plant diversity experiment, in which the diversity and structure of the plant community have been manipulated in large (25 m x 25 m) plots, offers the opportunity to examine the relative importance of vegetation characteristics and landscape position in determining rates of sediment movement... more
Dataset ID: 210121007


Data contact: Darren James
Duration: 2011 - 2013
Abstract: This completed dataset contains soil moisture data from a study at the Jornada Experimental Range (JER) in southern New Mexico. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009 and has five precipitation treatments (see Methods). While the study began in 2009, contains 50 plots (10 per treatment) and is ongoing, these data were only collected from July 2011 to December 2013 in a subset of 20 plots (4 per treatment). This dataset is intended to provide information about the amount of water in the top 30 cm of soil as well as verify that experimental precipitation manipulations are effective. Figure of soil moisture by precipitation treatment... more
Dataset ID: 210328003


Original Investigator: Robert S Campbell
1933 - ongoing
Abstract: In 1933 and 1935, two transects were established in the Natural Revegetation Exclosure and Pasture 8b, respectively, to measure long-term soil movement in areas undergoing mesquite invasion. These two transects, established in a Prosopis-Bouteloua ecotone, were to: "measure any future changes in the extent or succession of three contiguous zones of vegetation, Bouteloua eriopoda, Gutierrezia, and Prosopis glandulosa dunes. Thus, future chartings of this transect should show whether, under the range management practiced, the succession is progressing toward the black grama climax or whether it is retrogressing toward mesquite sandhills." (E.L. Little, 1935, unpublished report) Soil movement at these transects was measured by the distance between the soil surface and a notch in 50 cm t-... more
Dataset ID: 210365001


Data file: File irrnem.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1988 - 1988
Abstract: Soil samples were collected from mesquite dune site, and analyzed for nutrient content in the plant, N-mineralization potential, rhizobium counts, and nematode counts.
Dataset ID: 210386002


Data file: File nppsn91.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1991 - 1991
Abstract: Soil nutrient distribution in NPP quads in the Mesquite, Grassland, Playa, Creosotebush, and Tarbush plant communities sampled at 3 spatial scales of grids. Soils were sampled from the NPP (biomass plots). Each of the five vegetation types (mesquite, grassland, playa, creosote, tarbush) had three sites (with low, medium, and high production levels). At 14 of 15 sites a grid of 70 by 70 meters was set out. Within this 49 plots of 10 by 10 meters were placed and labeled (numbered) in serpentine design. At the 15th site, Playa College, 48 plots of 10 by 10 meters were laid out in three long rows of 16 plots per row. At all sites the soil sample of 0-10 cm depth was taken 1 meter from the NE marker bar at a diagonal (heading toward the SW marker). 70m x 70m layout of NPP quads where 1 is in... more
Dataset ID: 210398002


Data file: File nppschem.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1989 - 1989
Abstract: Soil nutrient distribution beneath and between plant canopies in the Mesquite, Grassland, Playa, Creosotebush, and Tarbush plant communities. The LTER plant biomass plots was sampled in June 1989. A total of 750 soil samples were collected from 5 depths (0- 10, 10-20, 20-40, 40-60, 60-100 cm), 2 locations (under and between shrubs), within 5 vegetation zones (Mesquite, Grassland, Playa, Creosotebush, Tarbush), 3 sites per zone (site with low, medium, and high biomass, ranked based on FALL-89 biomass), and 5 directions per site (in buffer zone just outside of NPP plots N, S, E, W, and in the center of NPP plots C). Samples were analyzed for pH, CaCO3, NaHCO3- extractable P, KCl-extractable NH4 and NO3, total kjeldahl N, Saturation extrac cations, and DTPA-extractable micronutrients.
Dataset ID: 210398001


Original Investigator: Jin Yao
Duration: 2001 - 2001
Abstract: This completed dataset, collected in 2001, contains soil particle size analysis (PSA) and sand fractionation data from soil cores collected at 116 quadrat locations that are part of the Jornada Experimental Range's long-term Permanent Quadrats study. The goal of this effort was to help characterize plant-scale factors related to vegetation dynamics observed in the Permanent Quadrats. At each quadrat location, 4 cores were collected at 2 depths (0-5cm and 5-20cm) and assessed for percent sand, silt and clay. The sand fraction, if large enough, was then separated into 5 sand size classes (53-106 micrometers, 106-250 micrometers, 250-500 micrometers, 500-1000 micrometers, 1000-2000 micrometers) to measure the percent fraction of each. Composition of Sand Fraction at 116 Permanent Quadrats... more
Dataset ID: 210351003


Original Investigator: Wesley Jarrell
Data contact: Mike Duniway
1989 - ongoing
Abstract:     Monthly soil water content measurements are made at 10 depths (where     possible) at each of 10 access tubes at each of the 15 LTER-II NPP     sites using a neutron probe (CPN Model 503DR Hydroprobe).  The counts     of thermalized neutrons are adjusted for the decay rate of Americium     241, then converted to soil water content using individual site     regressions.  Soil water content is a volume/volume relationship and     represent cm3 water/cm3 soil.  Data are provided at 30cm intervals from     30cm to a maximum of 270cm soil depth, shallower when an impenetrable     caliche layer is reached.  Field readings may include one at 300cm;     however, the value for the deepest depth of each access tube is removed     from the calculated soil water content data because of the effect... more
Dataset ID: 210013003


Original Investigator: Lara G Reichmann
Data contact: Osvaldo Sala
Duration: 2007 - 2009
Abstract: A 2-year experiment with ambient, reduced, and enhanced precipitation was designed to compare the performance of the  encroaching C3 shrub (honey mesquite Prosopis glandulosa) to the dominant C4 grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates and leaf water status. Precipitation manipulations dramatically enhanced natural variability and generated a range of rainfall scenarios that could have only been studied only after a multi-decade effort using natural conditions. Responses were highly asymmetric, with precipitation (PPT) additions generally influencing volumetric water content (vwc) to a greater extent than PPT reductions. Desert soils are usually close to their minimum water content  and thus when soils were dry, the effects of reducing PPT were relatively... more
Dataset ID: 210278001


Original Investigator: Kris Havstad
1996 - ongoing
Abstract: The goal of this sampling effort is to describe the vegetation response to treatments.  Data were collected following the line-point intercept method (Herrick et al. 2009).  Although the original LPI data set was in multivariate form with separate columns for canopy layers and soil surface, this data set has been transposed into vertical form, implementing a “layer” variable, so that all species and soil surface codes appear in one column.  Within each exclosure, 4837 points were sampled with the following exceptions: year exclosure total_points_sampled 1996 5 4825 1996 7 4836 1996 9 4836 1996 10 4836 1997 1... more
Dataset ID: 210461001


Data file: File mescan86.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Soils were sampled under Prosopis at four sites and under Larrea at one site on the Jornada Desert Site on October 1, 1986. Samples were taken from two depths (0-15cm, 15-30cm) for three canopy positions and one interzone position for each tree or shrub. Four trees or shrubs were sampled at each site. The soils were analyzed for Total Kjeldahl Nitrogen (TKN), and inorganic N-- nitrate-N and ammonium-N.
Dataset ID: 210394009


Data file: File mdssmite.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: **The objective of the present research was to determine whether there have been changes in the structure and function of the surface (0-20cm) soil system, the zone most affected by litter decomposition, which is associated with the rapid movement of mesquite from historical habitats (arroyo and playa fringe) into recent habitats (grassland and dunes). We hypothesized that the soil biotic communities would be poorly developed in the recent mesquite habitats because of lower soil C and nutrient concentrations. Data set contains microarthropod code, order, family, total number of mites, and trophic group for microarthropods sampled at two depth ranges in the top 20 cm of soil.
Dataset ID: 210394006


Data file: File irrmit.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1988 - 1989
Abstract: Soil samples were collected from mesquite dune site, and analyzed for nutrient content in the plant, N-mineralization potential, rhizobium counts, and microarthropods counts.
Dataset ID: 210386001


Data file: File mdssnema.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: **The objective of the present research was to determine whether there have been changes in the structure and function of the surface (0-20cm) soil system, the zone most affected by litter decomposition, which is associated with the rapid movement of mesquite from historical habitats (arroyo and playa fringe) into recent habitats (grassland and dunes). We hypothesized that the soil biotic communities would be poorly developed in the recent mesquite habitats because of lower soil C and nutrient concentrations. Data set contains Baerman Funnel extracted nematodes (fungal feeders, bacterial feeders, omnivore-predator, total plant parasites, total nematodes) and Elutriator extracted nematodes (fungal feeders, bacterial feeders, omnivore-predator, total plant parasites, total nematodes).
Dataset ID: 210394007


Data file: File mdssnutr.dat
Original Investigator: Ross Virginia
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: **The objective of the present research was to determine whether there have been changes in the structure and function of the surface (0-20cm) soil system, the zone most affected by litter decomposition, which is associated with the rapid movement of mesquite from historical habitats (arroyo and playa fringe) into recent habitats (grassland and dunes). We hypothesized that the soil biotic communities would be poorly developed in the recent mesquite habitats because of lower soil C and nutrient concentrations. As a result of these differences we predicted lower rates of net N mineralization in the soils from recent mesquite habitats. Data set contains analyses for gravimetric soil moisture, pH, phosphate, total Kjeldahl nitrogen, total phosphorus, NO3-N nitrogen mineralization, total... more
Dataset ID: 210394008


Data contact: Robert L Schooley
Duration: 1995 - 2005
Abstract: Termites are important detritivores in Chihuahuan Desert ecosystems and appear to have key roles in plant litter decomposition and nutrient cycling and in altering soil structure and hydrologic processes. These data were collected in conjunction with a study using exclosures to test the effects of rodents on vegetation and abiotic factors, established at each of the Sevilleta, Jornada and Mapimi research locations. At the Jornada, the effects of cattle were also measured using an additional exclosure. Three replicate experimental blocks of plots are randomly located at each study site to measure vegetation responses to the exclusion of rodents, and lagomorphs, and cattle. Due to their role in processing of plant matter, data on grasshoppers and termites was also collected at the Jornada.... more
Dataset ID: 210086008


Data contact: Robert L Schooley
Duration: 1995 - 2005
Abstract: Termites are important detritivores in Chihuahuan Desert ecosystems and appear to have key roles in plant litter decomposition and nutrient cycling and in altering soil structure and hydrologic processes. These data were collected in conjunction with a study using exclosures to test the effects of rodents on vegetation and abiotic factors, established at each of the Sevilleta, Jornada and Mapimi research locations. At the Jornada, the effects of cattle were also measured using an additional exclosure. Three replicate experimental blocks of plots are randomly located at each study site to measure vegetation responses to the exclusion of rodents, and lagomorphs, and cattle. Due to their role in processing of plant matter, data on grasshoppers and termites was also collected at the Jornada.... more
Dataset ID: 210086008


Project: Termite Baits

Original Investigator: Walter G Whitford
Duration: 1988 - 2000
Abstract:   Termites are important to litter decomposition and nutrient cycling in desert grasslands. The annual feeding activity on paper baits of subterranean termites in desertified (degraded-shrub dominated ecosystems) and relatively undegraded black-grama (Bouteloua eriopoda) grasslands was measured over six years on 12 sites on the Jornada Basin. Toilet paper roll termite baits were placed on grids on each consumer plot. Data include initial bait weights and bait weights after baits had been retrieved from the field once each year. Weight loss was calculated as a measure of termite foraging activity. This study is complete.
Dataset ID: 210010001


Original Investigator: Laura Huenneke
Duration: 1997 - 1997
Abstract: Changes in plant composition have the potential to cause disturbances in both structure and function throughout the ecosystem. One element of the ecosystem that can be affected is bird diversity and behavior. Certain species of birds depend more, or entirely, on habitats containing specific functional groups or species of vegetation. Habitat preferences in birds develop because of factors such as availability of food, nesting and perching locations, and cover.  Certain species of birds may be generalists while others use a small variety of plants due to strict habitat requirements. In this study we examine how different growth types of plants affect bird abundance, bird species diversity, and bird activity on the Jornada Basin. The experiment took place on the Biodiversity plots (25m X... more
Dataset ID: 210121006


Original Investigator: Laura Huenneke
Duration: 1997 - 1997
Abstract: Changes in plant composition have the potential to cause disturbances in both structure and function throughout the ecosystem. One element of the ecosystem that can be affected is bird diversity and behavior. Certain species of birds depend more, or entirely, on habitats containing specific functional groups or species of vegetation. Habitat preferences in birds develop because of factors such as availability of food, nesting and perching locations, and cover.  Certain species of birds may be generalists while others use a small variety of plants due to strict habitat requirements. In this study we examine how different growth types of plants affect bird abundance, bird species diversity, and bird activity on the Jornada Basin. The experiment took place on the Biodiversity plots (25m X... more
Dataset ID: 210121006


Data file: File creolitr.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1985 - 1988
Abstract: Creosotebush litterfall collected monthly from creosotebush zone Creosotebush litterfall collected monthly from creosotebush zone on upper bajada between College Playa and Mt. Summerford. Oven-dry weights of leave, stem, and seed fractions as well as total dry weight are recorded.
Dataset ID: 210389001


Data file: File leafarea.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Leaf weight-per-unit area of Larrea tridentata from creosote zone on LTER-I Control and Treatment transects was calculated. Litter used was collected from 4 litter baskets placed under each of 10 bushes on Control Transect and also the Treatment transect. Litter was from month of October litterfall. Thirty whole leaves were picked from each bush, dry weight obtained, soaked in H20 to soften, flattened, and run through area meter.
Dataset ID: 210390001


Data file: File tranmite.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1984 - 1985
Abstract: *Changes in microarthropod assemblages were monitored in six types of decomposing surface leaf-litter confined in mesh bags and set across a Chihuahuan Desert watershed for 17 months. The following hypotheses were tested: 1) microarthropod density and diversity are higher in soils with maximum surface litter accumulation, and 2) temporal patterns of density and diversity are more dependent on seasonal factors and physical disturbances than on the decompositional stage of the litter.
Dataset ID: 210372001


Data file: File mesqlitr.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1985 - 1988
Abstract: Mesquite litterfall collected monthly from mesquite fringe on south side of College Playa. Oven-dry weights of leave, stem, and seed fractions as well as total dry weight are recorded.
Dataset ID: 210389002


Data file: File soilsize.dat
Original Investigator: Peter Wierenga
Data contact: John Anderson
Duration: 1982 - 1984
Abstract: Variation in the soil from place to place is a fact of nature and is substantial. It is a major source of uncertainty in soil survey and causes many of the difficulties of applying mathematics to the study of soil. Soil variability within small areas can be studied by using a straight line (transect) laid over a tract of known distance and can be sampled and observed equidistantly. Line transects give an indication of both the local and the general variation. The technique, however, may depend strongly on direction of the transect. Soil along the LTER I Control transect was sampled at 30 meter intervals from station C01 through C89. Soil characteristics were measured at 4 depths (30, 60, 90, and 120 cm) for the percent composition of clay, silt, sand, very coarse sand, coarse sand, medium... more
Dataset ID: 210400003


Original Investigator: Gary Cunningham
Data contact: John Anderson
1982 - ongoing
Abstract: Average percent coverage of each plant species per 5-meter segment along a 30-meter line intercept perpendicular to each of 91 stations on each of the three LTER-I permanent transects. Data consists of week number, transect, station number, species, carbon reduction pathway, habit, form, and average percent cover. It is sorted by transect, station number, then plant species. Measurements are made on 30-meter line intercept transects located perpendicular to each of 91 stations on each of the 2.7 km long Control, Treatment, and Alternate Control Transects established at the beginning of LTER-I. Following January 1, 1987, spring line- intercepts will only record cover of annual species. All perennial cover data will be limited to fall samples. Both annuals and perennials are measured during... more
Dataset ID: 210119001


Data file: File tranprec.dat
Original Investigator: Marsha Conley
Data contact: John Anderson
Duration: 1982 - 1986
Abstract: Precipitation is recorded weekly at each of the 91 sampling stations located 30m apart along the LTER-I Control Transect from a direct- reading rain-gauge attached to the west cross-arm of the station marker.
Dataset ID: 210003001


Data file: File cations5.dat
Original Investigator: Peter Wierenga
Data contact: John Anderson
Duration: 1985 - 1985
Abstract: Levels of basic cations (Ca, Mg, Na, K) extractable in 1N ammonium acetate (NH4Ac) from soils collected at stations C01 through C90 along the LTER-I Control transect.
Dataset ID: 210400001


Data file: File trandist.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1986
Abstract: Contains areas of disturbances on soil/surface for different categories of animal (for example, Novomesser ant). To be used to calculate % disturbance and soil disturbance density by animal.
Dataset ID: 210374001


Original Investigator: Walter G Whitford
Duration: 1989 - 1989
Abstract: In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control... more
Dataset ID: 210015002


Original Investigator: Walter G Whitford
Duration: 1989 - 1989
Abstract: In the spring of 1982, as part of the establishment of the Jornada Long-Term Ecological Research site in southern New Mexico, a 135 ha portion of a 1500 ha, internally drained, watershed was exclosed from grazing by domestic livestock. Prior to exclosure the watershed, as well as the rest of the Jornada basin, had been moderately to heavily grazed for the past 100 years. Concurrent with grazing, the vegetation had undergone a dramatic change from desert grassland, with an almost continuous cover of C4 perennial grasses, to isolated patches of the original grassland in a mosaic with desert shrub dominated plant communities (Buffington and Herbel, 1965). Three parallel transects (2.7 km in length) run from the middle of the College Playa up into the foot of Mt. Summerford. The Control... more
Dataset ID: 210015003


Data file: File trannit.dat
Original Investigator: Fred Fisher
Data contact: John Anderson
Duration: 1983 - 1986
Abstract: NO3 + NO2-N and NH4-N levels of soil samples collected at each station along transect. Moisture content of soil samples is also included.
Dataset ID: 210399001


Data file: File phosphat.dat
Original Investigator: Peter Wierenga
Data contact: John Anderson
Duration: 1985 - 1986
Abstract: PO4-P levels in CaCl2 and NaHCO3 extracts of soils collected at each station along transect. Moisture content of soil samples is also included. No soil samples were collected along the fertilized (treated transect) in January 1985; January 1986 data contains both fertilized (treated) and control transect samples.
Dataset ID: 210400002


Original Investigator: Peter Wierenga
Data contact: John Anderson
1982 - ongoing
Abstract: Soil water content measurements (cm3 H2O / cm3 soil) at 5 depths at each of 89 (2" O.D. diameter) aluminum access tubes on the Control transect and at every 5th station on the nitrogen fertilized Treatment transect using a neutron probe (Campbell Model 503DR Hydroprobe). Access tubes are installed such that there are 6 inches of tube aboveground. Stations are 30 meters apart. Measurements are taken at 30cm, 60cm, 90cm, 110cm, and 130cm. Neutron probe readings taken in 6 lysimeters along transects are also included. 5 standard readings are taken at beginning and end of each transect, and after every 20 stations. Measurements taken at 2 week intervals from April 1982 to 1987, monthly since.
Dataset ID: 210012002


Original Investigator: Peter Wierenga
Data contact: John Anderson
1982 - ongoing
Abstract: Soil water content measurements in the form of raw count readings are made at 5 depths at each of 89 (2" O.D. diameter) aluminum access tubes on the Control transect and at every 5th station on the nitrogen fertilized Treatment transect using a neutron probe (Campbell Model 503DR Hydroprobe). Access tubes are installed such that there are 6 inches of tube aboveground. Stations are 30 meters apart. Measurements are taken at 30cm, 60cm, 90cm, 110cm, and 130cm. Neutron probe readings taken in 6 lysimeters along transects are also included. 5 standard readings are taken at beginning and end of each transect, and after every 20 stations. Measurements taken at 2 week intervals from April 1982 to 1987, monthly since.
Dataset ID: 210012001


Data file: File swp88.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1988 - 1988
Abstract: Soil water potential recorded on data sheets for psychrometers along treatment and control transects every 5 stations at 5cm, 15cm and 30cm depths. Soil temperatures at these depths and calibration slope and intercept for each psychrometer are included in order to convert microvolt readings to -bar readings.
Dataset ID: 210401002


Data file: File swp86-87_0.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1986 - 1987
Abstract: Soil water potential recorded on data sheets for psychrometers along treatment and control transects every 5 stations at 5cm, 15cm and 30cm depths. Soil temperatures at these depths and calibration slope and intercept for each psychrometer are included in order to convert microvolt readings to -bar readings.
Dataset ID: 210401001


Data file: File tranterm.dat
Original Investigator: Marsha Conley
Data contact: John Anderson
Duration: 1982 - 1986
Abstract: Data set includes bi-weekly records of number of termites observed within and beneath each of 4 rolls of toilet paper placed at each of 91 stations on treatment and control transects. Observations of presence of termite activity at each roll (paper eaten, cartons constructed) are also included.
Dataset ID: 210375001


Data file: File trantotn.dat
Original Investigator: Peter Wierenga
Data contact: John Anderson
Duration: 1985 - 1986
Abstract: Total nitrogen in soil was determined on control and treatment (fertilized) transects by Kjeldahl digestion.
Dataset ID: 210400004


Data file: File utsoilt.dat
Original Investigator: Walter G Whitford
Data contact: John Anderson
Duration: 1980 - 1986
Abstract: Soil temperature data was acquired using a mechanical chart recorder of soil temperatures with thermistors at 5 cm and 20 cm soil depths at a site approximately 20 feet west of the Upper Trailer on the Jornada.
Dataset ID: 210378001


Original Investigator: Eddie Garcia
Data contact: Darren James
1976 - ongoing
Abstract:     This data set is comprised of daily precipitation totals, in inches, measured by Belfort      Instruments weighing rain gauges at 58 locations on the Jornada Experimental Range.      Locations and the dates during which data were collected at them were generally project-oriented.      See comment section (#20) for start and end dates for each location.     Days on which data could not be obtained (due to equipment failure, user error, and/or      other reasons) are flagged as missing within this dataset.  As of 31 December 2008 they      comprised 1,270 of the total 291,465 records, which is less than 0.44% of the data set.  
Dataset ID: 210407001


Original Investigator: Elmer Ottis Wooton
Data contact: David Thatcher
1914 - ongoing
Abstract: Monthly summary of precipitation and air temperature data collected daily from standard U.S. climatological service instruments located at USDA Jornada Experimental Range Headquarters.
Dataset ID: 210379001


Original Investigator: Elmer Ottis Wooton
Data contact: David Thatcher
1914 - ongoing
Abstract: Monthly summary of precipitation and air temperature data collected daily from standard U.S. climatological service instruments located at USDA Jornada Experimental Range Headquarters.
Dataset ID: 210379002


Original Investigator: Fred N Ares
Data contact: David Thatcher
Duration: 1953 - 1979
Abstract: Monthly total of pan evaporation data collected daily from standard U.S. climatological service instruments located at USDA Jornada Experimental Range Headquarters.
Dataset ID: 210379003


Original Investigator: John Anderson
Data contact: Darren James
Duration: 1982 - 2018
Abstract: This dataset contains a list of vascular plant species found in the Jornada Basin, an area at the southern end of the Jornada del Muerto in Dona Ana County, New Mexico, USA, bordered by the Rio Grande on the west and the San Andres Mountains on the east. The area encompases the Jornada Basin LTER, Chihuahuan Desert Rangeland Research Center of New Mexico State University, and the plains and bajadas (but not foothills and mountains) of the USDA Jornada Experimental Range. Taxonomy follows Allred, Kelly A. 2012. Flora Neomexican I: Annotated Checklist, 2nd edition and is cross-referenced to the taxonomy maintained by the Jornada Basin LTER (see Methods and Additional Information) as well as species codes to the USDA PLANTS database (plants.usda.gov). More information is provided for species... more
Keywords:
Dataset ID: 210520001


Duration: 2016 - 2016
Abstract: t: The goal of this Master’s thesis project, which was carried out in July and August of 2016, was to assess the effect of inferred grazing intensity on 1) vegetation cover type and 2) soil organic carbon (SOC) at the Jornada Experimental Range in southern New Mexico. A sampling transect was established at each of 3 long term cattle water sources (85-106 years old), beginning 5m from the water source and continuing 1500m outward. Soil bulk density, soil organic carbon, soil organic nitrogen, and dominant plant cover type (shrub, grass, and bare soil) were sampled at 20 locations on each transect. Two hypotheses evaluated in this study are: 1) higher grazing pressure near the water source will lead to reduced vegetation cover and C inputs into the soil, leading to higher SOC stocks in soil... more
Dataset ID: 210472001


Original Investigator: William H Schlesinger
Data contact: John Anderson
1983 - ongoing
Abstract: Wet atmospheric fallout (wetfall occurring as precipitation) is collected monthly using an Aerochem Metrics wetfall/dryfall collector located at the LTER weather station. Each sample is analyzed for NO3, NH4, Cl, SO4, Ca, Mg, Na, K, Total N, & Total P.
Dataset ID: 210169002