Jornada Basin LTER Research

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Displaying 1 - 25 of 182 Datasets


File description including attribute definitions: data_JornadaStudy_370_grasshopper_plot_vegetation, File description including attribute definitions: Plant Species Codes
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370002
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.




File description including attribute definitions: data_JornadaStudy_370_grasshopper_plot_vegetation, File description including attribute definitions: Plant Species Codes
Original investigator: David Lightfoot
Duration: 1983 - 1985
Dataset ID: 210370002
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.




File description including attribute definitions: ANPP_6yr_means_precip_variability
Original investigator: Laureano Gherardi
Data contact: Darren James
Duration: 2009 - 2014
Dataset ID: 210328001
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.edirepository.org/nis/metadataviewer?packageid=knb-lter-jrn.210328001.1




File description including attribute definitions: data_Jornada_122001_crust_evolution_scrape_site_abrasion
Original investigator: Dale A Gillette
Data contact: Greg Okin
Duration: 1995 - ongoing
Dataset ID: 210122001
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.




File description including attribute definitions: data_Jornada_301001_aggregate_litterchem
Original investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Dataset ID: 210301001
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 encroachment.

We hypothesized that (i) reductions in grass cover would destabilize soils and promote SLM, and (ii) that SLM would enhance microbial abundance and alter microbial community composition in ways that accelerate decomposition. To test our hypotheses, we quantified mass loss, and chemistry of litter... more




File description including attribute definitions: data_Jornada_301001_aggregate_litterchem
Original investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Dataset ID: 210301001
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 encroachment.

We hypothesized that (i) reductions in grass cover would destabilize soils and promote SLM, and (ii) that SLM would enhance microbial abundance and alter microbial community composition in ways that accelerate decomposition. To test our hypotheses, we quantified mass loss, and chemistry of litter... more




File description including attribute definitions: data_Jornada_301002_aggregate_littermass
Original investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Dataset ID: 210301002
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 manipulated to simulate losses of grass cover from livestock grazing and shrub encroachment. I hypothesized that reductions in grass cover would promote SLM and accelerate mass loss by improving conditions for microbial decomposition.  This study is complete.

 

For more see: Hewins, D. B., S. R. Archer, G. S. Okin, R. L. McCulley, and H. L. Throop. 2013. Soil-litter mixing... more




File description including attribute definitions: data_Jornada_301002_aggregate_littermass
Original investigator: Dan Hewins
Data contact: Steven Archer
Duration: 2010 - 2012
Dataset ID: 210301002
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 manipulated to simulate losses of grass cover from livestock grazing and shrub encroachment. I hypothesized that reductions in grass cover would promote SLM and accelerate mass loss by improving conditions for microbial decomposition.  This study is complete.

 

For more see: Hewins, D. B., S. R. Archer, G. S. Okin, R. L. McCulley, and H. L. Throop. 2013. Soil-litter mixing... more




Download data: File nh3vol88.dat
File description including attribute definitions: data_JornadaStudy_393_ammonia_volitalization_1988
Original investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1988 - 1988
Dataset ID: 210393001
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 mineralization is stimulated by rainfall. Overall rates of NH3 volatilization from undisturbed desert ecosystems appear to be much lower than those reported for rangeland and agricultural soils.

The data set shows ammonia volatilization from grassland, cresotebush, and playa habitats in response to a variety of experimental treatments chosen to elucidate the processes controlling the... more




Download data: File anmltran.dat
File description including attribute definitions: data_JornadaStudy_009_npp_animal_transects
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1989 - 1994
Dataset ID: 210009001
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.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_soil_nutrient
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368002
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+). Also included is below ground biomass from five ant nests for each of the three sites.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_organic_matter
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368003
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.




File description including attribute definitions: data_JornadaStudy_368_ant_nest_soil_water_content
Original investigator: Rodolfo R Di Marco
Data contact: John Anderson
Duration: 1987 - 1987
Dataset ID: 210368004
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).




Download data: Binary Data ablitape.raw
File description including attribute definitions: data_JornadaStudy_384_arson_burn_field_data_tape
Original investigator: Debra Peters
Data contact: John Anderson
Duration: 2000 - 2000
Dataset ID: 210384001
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 all segments. 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... more




Download data: File ablilt.dat
File description including attribute definitions: data_JornadaStudy_384_arson_burn_percent_cover
Original investigator: Debra Peters
Data contact: John Anderson
Duration: 2000 - 2000
Dataset ID: 210384002
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 using a "species" code of BURN. 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... more




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1995_2001
Original investigator: David Lightfoot
Duration: 1996 - 2001
Dataset ID: 210008001
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 be related to the NPP of the sites.  Data for arthropods captured in pitfall traps on LTER III consumer plots at 2 month intervals. Data includes order, family, genus, species, and number. This data collection has been completed.




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1988_1994
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Dataset ID: 210008002
Abstract:

Data for arthropods captured in pitfall traps on LTER II consumer plots. Data includes order, family, genus, species, and number.




File description including attribute definitions: data_JornadaStudy_008_npp_arthropod_pitfall_trap_1988_1994
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1988 - 1994
Dataset ID: 210008002
Abstract:

Data for arthropods captured in pitfall traps on LTER II consumer plots. Data includes order, family, genus, species, and number.




Download data: File ltrophic.dat
File description including attribute definitions: data_JornadaStudy_369_larrea_arthropod_trophic_composition
Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1986 - 1986
Dataset ID: 210369001
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.




File description including attribute definitions: Jornada_atmospheric_deposition_wetfall
Original investigator: William H Schlesinger
Data contact: John Anderson
Duration: 1983 - 2017
Dataset ID: 210128002
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.  




Download data: File bdpltres.dat
File description including attribute definitions: data_JornadaStudy_121_biodiversity_plant_response
Original investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1999 - 1999
Dataset ID: 210121004
Abstract:

Pilot study to examine feasibility of measuring individual species response to competing vegetation removal




Original investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1996 - ongoing
Dataset ID: 210121008
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).




Original investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1996 - ongoing
Dataset ID: 210121005
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).




File description including attribute definitions: data_JornadaStudy_015_transect_vegetation_biomass_data
Original investigator: Walter G Whitford
Duration: 1989 - 1989
Dataset ID: 210015001
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 transect is to the west, the Treatment transect is to the east side of the Control transect, and the Alternate Control is to the east of the Treatment transect. Each transect is 30 meters wide with a 45 meter buffer zone between each transect. The Treatment transect was treated annually until 1987 with NHNO3 in a concentration equal to 10g N/m2. The station markers occur at 30 meter intervals along... more




Download data: File bdremove.dat
File description including attribute definitions: data_JornadaStudy_121_biodiversity_biomass_removal
Original investigator: Laura Huenneke
Data contact: John Anderson
Duration: 1995 - 1995
Dataset ID: 210121003
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.


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