Jornada Data Catalog

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Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100121004


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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: 2100121004


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100121005


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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: 2100121005


Original investigator: Jornada Basin LTER
Data contact: John Anderson
Duration: 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: 2100126003


Original investigator: Al Rango
Data contact: John Anderson
Duration: 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: 2100169001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100169001


Original investigator: Walt 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: Walt Whitford
Data contact: John Anderson
Duration: 1986 - ongoing
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: 210120001


Original investigator: Jin Yao
Data contact: John Anderson
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: Al Rango
Data contact: John Anderson
Duration: 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: 2100127001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100127001


Original investigator: Greg Okin
Data contact: Greg Okin
Duration: 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: 2100288001


Original investigator: John Anderson
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: 2100001002


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: 2100001002


Original investigator: John Anderson
Data contact: John Anderson
Duration: 1989 - 1990
Abstract: On 10/27/89, 03/14/90, and 10/19/90, % plant cover by species was measured on 20 2x2m hydrology run off plots using quadrats with 10x10cm units. Site identification follows: ZONE C - creosotebush; G - grassland SITE CALI-HYD Caliche site - Hydrology study TERM-HYD Termite +/- site - Hydrology study IBPE-HYD IBPE site - Hydrology study SUMM-HYD Summerford site - Hydrology study PLOT CALI-HYD, IBPE-HYD, & SUMM-HYD each have 4 run off plots numbered 1-4. TERM-HYD has 8 plots; 4 control (C1-C4) and 4 treatment (T2-T5). Treatment was with Chlordane to eliminate termites in soil.
Dataset ID: 210001001


Original investigator: Tim Ward
Data contact: John Anderson
Duration: 1989 - 1990
Abstract: On 10/27/89, 03/14/90, and 10/19/90, % plant cover by species was measured on 20 2x2m hydrology run off plots using quadrats with 10x10cm units. Site identification follows: ZONE C - creosotebush; G - grassland SITE CALI-HYD Caliche site - Hydrology study TERM-HYD Termite +/- site - Hydrology study IBPE-HYD IBPE site - Hydrology study SUMM-HYD Summerford site - Hydrology study PLOT CALI-HYD, IBPE-HYD, & SUMM-HYD each have 4 run off plots numbered 1-4. TERM-HYD has 8 plots; 4 control (C1-C4) and 4 treatment (T2-T5). Treatment was with Chlordane to eliminate termites in soil.
Dataset ID: 210001001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 1988 - 1990
Abstract: The data consists of chemical analyses of dissolved ions in samples of surface runoff from natural rainfall events collected from experimental hydrology plots in creosotebush scrub and grass- land areas of the New Mexico State University Ranch and USDA Jornada Experimental Range. Chemical analyses are for 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.
Dataset ID: 210001003


Original investigator: Tim Ward
Data contact: John Anderson
Duration: 1988 - 1990
Abstract: The data consists of chemical analyses of dissolved ions in samples of surface runoff from natural rainfall events collected from experimental hydrology plots in creosotebush scrub and grass- land areas of the New Mexico State University Ranch and USDA Jornada Experimental Range. Chemical analyses are for 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.
Dataset ID: 210001003


Original investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: David Thatcher
Duration: 1915 - ongoing
Abstract: The objective of this long-term project is to measure the precipitation across the entire Jornada Experimental Range. This is achieved by using a network of standard-can rain gauges to continually collect the precipitation as it occurs. The collected precipitation is then measured monthly and the results are recorded on a data sheet which is later entered into a spread sheet.
Dataset ID: 2100380001


Original investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: Kris Havstad
Duration: - 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
Data contact: Kris Havstad
Duration: 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
Data contact: Kris Havstad
Duration: 1939 - ongoing
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: 2100392001


Original investigator: Walt Whitford
Data contact: John Anderson
Duration: 1989 - 2006
Abstract: In conjunction with net primary production studies, consumer and faunal studies are conducted at or near NPP sites using pitfall traps. We use live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement is used with the lizards. Variables measured include species, sex, recapture status, snout-vent length, total length, weight, and whether tail is broken or whole.
Dataset ID: 2100007001


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 1989 - 2006
Abstract: In conjunction with net primary production studies, consumer and faunal studies are conducted at or near NPP sites using pitfall traps. We use live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement is used with the lizards. Variables measured include species, sex, recapture status, snout-vent length, total length, weight, and whether tail is broken or whole.
Dataset ID: 2100007001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 1989 - 2006
Abstract: In conjunction with net primary production studies, consumer and faunal studies are conducted at or near NPP sites using pitfall traps. We use live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement is used with the lizards. Variables measured include species, sex, recapture status, snout-vent length, total length, weight, and whether tail is broken or whole.
Dataset ID: 2100007001


Original investigator: Jornada Basin LTER
Data contact: John Anderson
Duration: 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: 2100126001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100002001


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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: 2100002001


Original investigator: Mike Duniway
Data contact: John Anderson
Duration: 1989 - ongoing
Abstract: 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, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to "." in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. Data from... more
Dataset ID: 210013002


Original investigator: Ross Virginia
Data contact: John Anderson
Duration: 1989 - ongoing
Abstract: 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, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to "." in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. Data from... more
Dataset ID: 210013002


Original investigator: Mike Duniway
Data contact: John Anderson
Duration: 1989 - ongoing
Abstract: 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, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to \\".\\" in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. The... more
Dataset ID: 210013001


Original investigator: Ross Virginia
Data contact: John Anderson
Duration: 1989 - ongoing
Abstract: 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, 180cm, 210cm, 240cm, 270cm, and 300cm when possible or to the greatest depth it was possible to install the access tubing before hitting impenetrable caliche. If fewer depths were measured, the missing depths have a zero in the raw data set of count values. These are changed to \\".\\" in converted water content data set. Calculated water content values equal to less than zero are changed to zero in converted water content data set. Converted water content values are a volume/volume relationship and represent cm3 water/cm3 soil. The... more
Dataset ID: 210013001


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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. Attention: These data are not appropriate for estimates of percentage cover. NPP-associated percent cover measurements were developed for and are used solely to provide the best estimate of biomass production. Becuase the methodology results in measurements of overlapping subcanopy systems and canopies of adjacent individuals, NPP percent cover measurements are not an appropriate measure of actual aerial plant cover. Doing so will result in inflated numbers for the "actual" vegetative cover. Attention: Data through... more
Dataset ID: 2100011003


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100011005


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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.     Attention: These data are not appropriate for estimates of percentage      cover. NPP-associated percent cover measurements... more
Dataset ID: 2100011001


Original investigator: Laura F Huenneke
Data contact: John Anderson
Duration: 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 F Huenneke
Data contact: John Anderson
Duration: 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: 2100011004


Original investigator: Heather Throop
Data contact: Heather Throop
Duration: 2007 - 2008
Abstract: Data are photosynthetic rates (Amax) for leaves collected from plants subjected to five possible precipitation treatments: -80%, -50%, control (0), +50%, +80%. The objective is to assess photosynthetic response of plants to precipitation manipulations.
Dataset ID: 2100409001


Original investigator: Osvaldo Sala
Data contact: Osvaldo Sala
Duration: 2006 - ongoing
Abstract: We use vegetation cover as a proxy for plant biomass to avoid confounding spatial and temporal variability or confounding the impact of harvesting. The rate of biomass change is Aboveground net primary production, a key variable that will respond to our PPT and nutrient manipulations. Measured variables: individual cover of plant species measured as cm of green biomass that intercepts a 250cm long line, then averaged for 3 lines/plot.
Dataset ID: 2100278002


Original investigator: Lara G Reichmann
Data contact: Osvaldo Sala
Duration: 2006 - ongoing
Abstract: We use vegetation cover as a proxy for plant biomass to avoid confounding spatial and temporal variability or confounding the impact of harvesting. The rate of biomass change is Aboveground net primary production, a key variable that will respond to our PPT and nutrient manipulations. Measured variables: individual cover of plant species measured as cm of green biomass that intercepts a 250cm long line, then averaged for 3 lines/plot.
Dataset ID: 2100278002


Original investigator: Dawn Browning
Data contact: Dawn Browning
Duration: 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: 2100287001


Original investigator: Laura F Huenneke
Data contact: Dawn Browning
Duration: 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: 2100287001


Original investigator: Heather Throop
Data contact: Heather Throop
Duration: 2007 - 2008
Abstract: Data are pre-dawn water potential for leaves collected from plants subjected to five possible precipitation treatments: -80%, -50%, control (0), +50%, +80%. The objective is to assess water status of plants in response to precipitation manipulations.
Dataset ID: 2100409002


Original investigator: Brandon Bestelmeyer
Data contact: Brandon Bestelmeyer
Duration: 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: 2100086003


Original investigator: David Lightfoot
Data contact: Brandon Bestelmeyer
Duration: 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: 2100086003


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
Duration: 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: 2100086004


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 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: 2100086004


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
Duration: 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: 2100086005


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 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: 2100086005


Original investigator: Robert L Schooley
Data contact: Robert L Schooley
Duration: 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: 2100086006


Original investigator: David Lightfoot
Data contact: Robert L Schooley
Duration: 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: 2100086006


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
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: 2100086009


Original investigator: David Lightfoot
Data contact: John Anderson
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: 2100086009


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
Duration: 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: 2100086007


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 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: 2100086007


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
Duration: 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: 2100086008


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 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: 2100086008


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
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: 2100086001


Original investigator: David Lightfoot
Data contact: John Anderson
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: 2100086001


Original investigator: Brandon Bestelmeyer
Data contact: John Anderson
Duration: 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: 2100086002


Original investigator: David Lightfoot
Data contact: John Anderson
Duration: 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: 2100086002


Original investigator: Kris Havstad
Data contact: Kris Havstad
Duration: 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: 2100365001


Original investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: Kris Havstad
Duration: 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: 2100365001


Original investigator: Osvaldo Sala
Data contact: Osvaldo Sala
Duration: 2006 - ongoing
Abstract: Volumetric soil water is used to measure the effectiveness of the water manipulation treatments. Soil water content is monitored at 2 depths (5-10, 30-50 cm) using ECH2OTM moisture probes connected to an ECH2O check handheld.
Dataset ID: 2100278001


Original investigator: Lara G Reichmann
Data contact: Osvaldo Sala
Duration: 2006 - ongoing
Abstract: Volumetric soil water is used to measure the effectiveness of the water manipulation treatments. Soil water content is monitored at 2 depths (5-10, 30-50 cm) using ECH2OTM moisture probes connected to an ECH2O check handheld.
Dataset ID: 2100278001


Original investigator: John Anderson
Data contact: John Anderson
Duration: 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: 2100119001


Original investigator: Gary Cunningham
Data contact: John Anderson
Duration: 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: 2100119001


Data file: tranprec.dat
Original investigator: 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: 2100003001


Original investigator: Mike Duniway
Data contact: John Anderson
Duration: 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
Duration: 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


Data file: utsoilt.dat
Original investigator: 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: DSL2005013


Original investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: David Thatcher
Duration: 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: 2100379001


Original investigator: USDA ARS Jornada Experimental Range (JER)
Data contact: David Thatcher
Duration: 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: 2100379002


Original investigator: USDA ARS Jornada Experimental Range (JER)
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: 2100379003


Original investigator: Jornada Basin LTER
Data contact: John Anderson
Duration: 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: 2100169002