Short and Long-Term Data

Data by Research Category
All Projects Datasets
Animal Projects Datasets
Climate Projects Datasets
Decomposition Projects Datasets
Hydrology Projects Datasets
Plant Projects Datasets
Soil Projects Datasets
Displaying 1 - 41 of 41 Research Projects

Animal Projects

  • Dataset: Animal Transect Data
Project ID: 210009000
Abstract:

Jackrabbits and desert cottontail rabbits are the most abundant non-domestic herbivores in the Chihuahuan Desert. We hypothesize that lagamorph populations were extremely low in desert grasslands prior to desertification because rabbits depend upon shrubs for water (bark and small stems), during the winter dry season. Data on population densities of rabbits in various habitats over a series of years is needed to test this hypothesis. We further hypothesize that... more


  • Dataset: Arthropod Pitfall Traps-III in 5x1 grid at LTER II NPP sites
  • Dataset: Arthropod Pitfall Traps-II in 4x4 grid at LTER II NPP sites
Project ID: 210008000
Abstract:

Pitfall traps are used to collect and identify ground-dwelling arthropods at each of the 15 plant NPP sites established in 1989 during LTER II. 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... more


Project ID: PRL2005011
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... more


  • Dataset: Ecotone rodent metrics (abundance, biomass, energy, species richness)
  • Dataset: Ecotone annual net primary productivity by plant form
  • Dataset: Ecotone rodent trapping
Project ID: 210262000
Abstract:

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 partition resources (in terms of C3 (forbs and... more


  • Dataset: Density and cover of winter annual plants
  • Dataset: Ant nest soil nutrients
  • Dataset: Ant nest soil organic matter
  • Dataset: Ant nest soil water content
Project ID: 210368000
Abstract:

Cover and density of winter annual plants on the perimeters of ant nests were compared with those of adjacent reference sites in three habitats at Jornada LTER, New Mexico, USA. There was a distinct floristic assemblage of winter annual plants on ant nest perimeter in comparison to reference sites. Descurainia pinnata, Lesquerella gordonii, Malacothrix fendleri and Eriogonum abertianum were strongly associated with ant nest perimeters and had higher cover on ant... more


  • Dataset: Jornada Experimental Range stocking rates for cattle, horses, and sheep beginning 1916
Project ID: 210412000
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.


Project ID: PRL2005010
Abstract:

Desert grasshopper assemblages from sites in the Chihuahuan desert were assessed for guilds on the basis of substrate or microhabitat use and morphological characteristics of component species. These study area had 9 separate sites on the east bajada of the Dona Ana Mts. The sites were arranged in 3 X 3 configurations across a bajada so that the bajada represented an environmental gradient with varying soil and vegeation characteristics from top to bottom. Three... more


  • Dataset: Lizard pitfall trap data (LTER-II, LTER-III)
Project ID: 210007000
Abstract:

Methods and locations. Pitfall trap grids have been installed at three creosotebush sites, three grassland sites, and three mesquite sites, and two tarbush sites. Each grid consists of 4 x 4 rows of traps at 15 meter intervals. Each pitfall trap is 40 cm deep, and lined with tin can cylinders. A polyethylene funnel is set on a container in each trap. Each trap has a ceramic tile cover which is used to close the trap during non-sampling periods. Traps were opened... more


  • Dataset: SMES rabbit survey data
  • Dataset: SMES Leaf Litter Data
  • Dataset: SMES Rabbit Feces Data
  • Dataset: SMES Soil Surface Disturbance
  • Dataset: SMES termite casing data
  • Dataset: SMES rodent trapping data
  • Dataset: SMES Vegetation Line Intercept Data
  • Dataset: SMES vegetation quadrat data
  • Dataset: SMES Cryptogam Crust Data
Project ID: 210086000
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... more


  • Dataset: Small mammal trapping (LTER-II)
Project ID: 210005000
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... more


Project ID: PRL2005006
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... more


  • Dataset: Rabbit Pellet Biomass
  • Dataset: Rabbit Pellet Total Nitrogen
Project ID: 210373000
Abstract:

The study was undertaken to look at clipping, or browsing, of plants by rabbits in the creosotebush and upper mixed basin zone on the bajada below Mt. Summerford that extends down to College Playa.

At beginning of study the following questions were asked:

1. How much nitrogen is in wastage (plants and rabbit pellets)?

2. Does nitrogen vary seasonally in plants and pellets?

3. Compare N in rabbit clippings with senescent litter in... more


  • Dataset: Transect Soil Disturbance
Project ID: 210374000
Abstract:

Data were collected on disturbances on soil/surface for different categories of animal (for example, Novomesser ant). Information was used to calculate percent disturbance and soil disturbance density by animal on a fertilized (with NHNO3 in a concentration equal to 10g N/m2) transect and adjacent control transect.


  • Dataset: Transect Termites
Project ID: 210375000
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.


Animal Projects

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Decomposition Projects

  • Dataset: Termite bait data
Project ID: 210010000
Abstract:

Data for Jornada LTERII termite bait weight loss. Toilet paper roll termite baits are placed on grids on each consumer plot. Data include initial bait weights and bait weights after baits have been retrieved from the field once each year. Weight loss is calculated as a measure of termite foraging activity.


Climate Projects

  • Dataset: Dryfall deposition chemistry data
  • Dataset: Wetfall deposition chemistry data
Project ID: 210169000
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.

Wetfall occurring as precipitation is collected after each event with a sample size large enough to analyze. Dryfall is collected monthly. Each sample is analyzed for NO3, NH4, Cl, SO4, Ca, Mg,Na, K, Total N, & Total P. Inclusion of... more


  • Dataset: Estimated daily precipitation at the 15 ANPP sites: 1980-2010
Project ID: 210425000
Abstract:

The principal purpose is to provide daily precipitation at specific sites to assist the study of vegetation response over time. 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... more


  • Dataset: Evaporation pan data beginning 1983 - Jornada LTER Weather Station
Project ID: 210127000
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... more


  • Dataset: JER standard gauge monthly precipitation data
Project ID: 210380000
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 gages 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 spreadsheet.


  • Dataset: Dipstick rain gauge data - LTER Weather Station
  • Dataset: LTER Weather Station hourly summary climate data
  • Dataset: LTER Weather Station daily summary climate data
Project ID: 210126000
Abstract:

Jornada LTER climatalogical station on the Jornada basin. Weather station location:

            deg   min  sec           UTM: 331192.4E 3599474N WGS84, Zone 13

LAT        32     31   17

LONG   106     47   50

Hourly and Daily Summary climate data... more


  • Dataset: Monthly graduated rain gauge (GRG) precipitation at 15 NPP sites (LTER-II)
Project ID: 210002000
Abstract:

Collection is made of total monthly precipitation at the 15 Net Primary Production sites on the day that monthly soil water content measurements are made in order to correlate precipitation input with belowground water content both spatially and temporally.


  • Dataset: Transect Precipitation
Project ID: 210003000
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,... more


  • Dataset: Upper Trailer Soil Temperature
Project ID: 210378000
Abstract:

Temperature data was acquired using a mechanical chart recorder of soil temperatures at 5 cm and 20 cm soil depths at a site approximately 20' west of the Upper Trailer on the Jornada.


  • Dataset: USDA-NOAA NWS Daily Climatological Data
  • Dataset: USDA-NOAA NWS Monthly Summary Climatological Data
  • Dataset: USDA-NOAA NWS Monthly Total Pan Evaporation Data
Project ID: 210379000
Abstract:

Climate data collected at USDA Jornada Experimental Range Headquarters which is a NOAA weather station. Daily data has been collected since 1914 for minimum and maximum air temperature as well as daily precipitation. Pan evaporation data was collection from January 1956 through August 1979.


Hydrology Projects

  • Dataset: Hydrology natural runoff plots - runoff
  • Dataset: Hydrology plot surface runoff water chemistry
  • Dataset: Hydrology natural runoff plots plant cover
Project ID: 210001000
Abstract:

Looking at infiltration and runoff rates as related to rain event duration and intensity as well as soil and organic movement as related below in creosotebush and grassland areas. Nine hydrology runoff plots were begun in 1983 during LTER-I and located in creosotebush zone. An additional 12 runoff plots have been added. These additions consist of 4 each at C-CALI, G-SUMM, and G-IBPE. G-SUMM and G-IBPE are blackgrama grassland sites. Refer to LTER site map for... more


  • Dataset: Hydrological and Energy Surface and Atmospheric Fluxes in the Tromble Watershed from 6/2010 to 10/2011
  • Dataset: Precipitation Measured at Four Locations in the Tromble Watershed from 6/2010 to 10/2011
  • Dataset: Soil Moisture in the Tromble Watershed from 6/2010 to 10/2011
Project ID: 210338000
Abstract:

The seasonal variability in rainfall duration, intensity, and volume due to the North American Monsoon Season (NAMS) has been well documented in southwestern American semiarid landscapes.  The characteristic high intensity convective NAMS storm systems during the months of June-September lead to a greatly altered land surface in terms of soil moisture and vegetation.  However, large-scale investigation of the effects of land-surface changes on... more


Decomposition Projects

Plant Projects

  • Dataset: Arson burn on LTER-I Transect plant line intercepts - field data (tape format)
Project ID: 210384000
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,... more


  • Dataset: Conmod Pilot Study: Annual plant canopy gap and basal gap intercept data
  • Dataset: Conmod Pilot Study: Annual vegetation transect Line Point Intercept measurements
Project ID: 210308000
Abstract:
This study is designed to generate predictions about the density, spatial arrangement and cover of obstructions to wind and water necessary to promote grass recovery in
shrub-dominated plant communities in the northern Chihuahuan Desert.  Specifically, we would like to "(a) to understand the density of vegetation regrowth in intershrub areas(such as we have seen as a result oi last summer) necessary for it to become self-sustaining and... more

  • Dataset: Drought recovery gas-exchange of Larrea Tridentata
Project ID: 210391000
Abstract:

Principal questions include: 1. How fast do key physiological functions (CO2 assimilation, stomatal conductance, leaf water status, leaf area, PS II function) recover upon soil rewetting after drought, and in what order? Details include: does stomatal conductance follow the Ball-Berry model, gs = m A hs/Cs + b, with A = CO2 assimilation rate, hs, Cs = relative humidity and CO2 mixing ratio at the leaf surface, and m, b= empirical constants (but almost universally... more


  • Dataset: East and west boundary fence plant line intercepts - percent cover for 9 species, Jornada Basin, 1982 to 1992
  • Dataset: East and west boundary fence plant line intercepts - percent cover for all species beginning 1986
Project ID: 210120000
Abstract:

PURPOSE:

Investigate the response of vegetation with respect to landscape characteristics as well as release from grazing through vegetation monitoring across fence lines of grazed and ungrazed pastures.

INTRODUCTION.

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... more


  • Dataset: Erosion zone vegetation
  • Dataset: Biomass removal, initiation of biodiversity experiment
  • Dataset: Biodiversity plots vegetation transects
  • Dataset: The Effects of Changing Vegetative Composition on the Abundance, Species Diversity and Activity of Birds in the Chihuahuan Desert
  • Dataset: Biodiversity tipping bucket rain gauge data - Daily Summary
  • Dataset: Biodiversity tipping bucket rain gauge data - By Event
Project ID: 210121000
Abstract:

Our understanding of ecological function in desert systems suggests that the physiological and morphological differences among species act as strong influences on resource capture and ecosystem modification; hence alteration of the composition or the relative abundances of species should alter availability and cycling of energy, water, and other resources. We initiated a long-term experiment in which the diversity of plant "functional types" and of plant species... more


  • Dataset: Fluffgrass rhizosphere N mineralization potential
  • Dataset: Fluff grass mesocosm: mites and nematodes
Project ID: 210385000
Abstract:

Recent studies suggest that rhizosphere soil microarthropods may have a major role in determining soil nitrogen availability. Desert soil microarthropods are consumers of soil bacteria, fungi, and nematodes, thus they accelerate mineralization processes by causing turnover in immobilized nitrogen. [It is] hypothesized that changing densities of soil microarthropods would result in changes in nitrogen availability. In order to test this hypothesis, Erionueron... more


  • Dataset: Plant cover in precipitation and nitrogen treatment plots (by species)
  • Dataset: Soil water content in precipitation and nitrogen treatment plots at 2 depth profiles
Project ID: 210278000
Abstract:

On a continental scale, a strong spatial correlation between precipitation and aboveground net primary production (ANPP) gives us great confidence that precipitation is the primary driver of ANPP in arid and semi-arid ecosystems, which occupy nearly 40% of the Earth's land surface. However, as a series of comparable long-term data sets have become available in recent years, the relationship has not held up in a temporal context; annual precipitation accounts for... more


  • Dataset: Photosynthetic rates for leaves from 5 precipitation treatments
  • Dataset: Pre-dawn water potential for leaves from 5 precipitation treatments
Project ID: 210409000
Abstract:

The project explores the influence of precipitation change on black grama and mesquite ecophysiology. Precipitation is manipulated relative to ambient precipitation with Sala et al's rainout shelters and sprinklers in Pasture 13. Ecophysiological measurements (pre-dawn water potential and photosynthesis) are measured throughout the growing season.


  • Dataset: Jornada Experimental Range permanent quadrat chart data beginning 1915 - plant density
Project ID: 210351000
Abstract:
Permanent quadrats record vegetation changes since 1915 in a range of vegetation and soil texture types. More than 100 1 x 1 m**2 quadrats were set up between 1915 and 1932 to study the response of major forage species to cattle grazing and precipitation. A pantograph was used to chart the following variables:
  1. basal area of perennial grasses,
  2. locations of annual grasses, forbs, and shrubs, and sometimes
  3. ... more

  • Dataset: Soil Nutrients
  • Dataset: Mesquite Foliar Arthropods
  • Dataset: Mesquite Phenology
  • Dataset: Mesquite Tissue Nutrients - 1986
  • Dataset: Mesquite Soil Mites
  • Dataset: Mesquite Root Tube Soil Nutrients
  • Dataset: Mesquite Tissue Nutrients - 1987
Project ID: 210386000
Abstract:

The mesquite phenology study includes multiple studies and experiments all designed to highlight soil microarthropods, soil nutrients, and phenological aspects of mesquite systems. Some experiments examine the above in the context of resource limitation (irrigation experiments), in simple studies examining multiple mesquite habitats (dune, arroyo, grassland and playa study), and in additional studies where documentation is not complete.


  • Dataset: Stressor II transect line point intercept data
Project ID: 210461000
Abstract:

The objective of this project is to determine the effect of multiple stressors (grazing and shrub removal) on the decline and recovery of perennial grasses in a black grama-mesquite savanna on sandy soils. The initial savanna state represents an intermediate and possibly stable state between black grama grassland and mesquite shrubland. The experimental manipulations removed about 60% of aboveground herbaceous biomass over 24-36 hour periods in each of four years (... more


  • Dataset: Plant phenology transect at NPP sites
Project ID: 210287000
Abstract:

The phenological stage of select 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). Data are summarized as the percentage of total... more


Project ID: PRL2002035
Abstract:

Location: Northern Chihuahuan Desert 37 kilometers N of Las Cruces, New Mexico on the NMSU College Ranch and the USDA Jornada Exp. Range. Climate: Characterized by an abundance of sunshine, a wide range between day and night temperatures, low relative humidity, an evapotranspiration rate averaging 229 cm per year, and extremely variable precipitation. The average annual precipitation is 230 mm, with 52% occurring during the summer. Droughts are recurrent climatic... more


  • Dataset: NPP Study: Annual ground-based photographs of 15 NPP sites beginning 1996
  • Dataset: NPP Study: Quadrat biomass data
  • Dataset: NPP Study: Quadrat field measurement data
  • Dataset: NPP Study: Reference harvest data
  • Dataset: NPP Study: Annual aboveground net primary production, summary by site
Project ID: 210011000
Abstract:

Deserts and semi-deserts are characterized as ecosystems of low primary productivity, but a more pertinent trait is the variability of plant production in space and time. In dryland ecosystems there are usually some locations on the landscape (e.g., sites receiving run-on moisture from adjacent areas) and some time periods where plant growth is lush in response to temporary favorable conditions. Our objective in monitoring net primary production, therefore, is to... more


  • Dataset: Transect Larrea Leaf Area
Project ID: 210390000
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,... more


  • Dataset: Transect Creosote Litterfall
  • Dataset: Transect Mesquite Litterfall
Project ID: 210389000
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,... more


  • Dataset: Transect plant line intercepts - LTER series (sorted sheet format)
  • Dataset: Transect plant line intercepts - field data (tape format)
  • Dataset: Transect plant line intercepts - percent cover by species
Project ID: 210119000
Abstract:

INTRODUCTION. 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... more


  • Dataset: Root Chemistry
  • Dataset: Root Chemistry Raw Data
  • Dataset: Root Weight
Project ID: 210387000
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... more


  • Dataset: Transect Soil Mineralization Potential (Initial)
  • Dataset: Transect Vegetation Biomass
Project ID: 210015000
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,... more


  • Dataset: Line intercept data of long-term vegetation responses to shrub removal and lagomorph exclusion in a creosotebush community
Project ID: 210392000
Abstract:

Three exclosure sites each with sixteen 21.3 x 21.3 m plots were established in 1938/39 to evaluate the effects of lagomorph exclusion and shrub removal in a creosotebush dominated community. The study sites, developed by Ken Valentine, were placed on the Jornada Experimental Range at the following locations: 1) outside the southeast corner of the Gravelly Ridges Artificial Revegetation Enclosure, 2) about one half mile southwest of Parker Tank, and 3) inside the... more


Soil Projects

  • Dataset: Nitrogen volatilization from grassland soils - 1989
  • Dataset: Ammonia volatilization from Chihuahuan Desert habitats - 1988
Project ID: 210393000
Abstract:

Little is known about the loss of NH3 from non- agricultural soils. Many native soils in arid regions have alkaline pH and may be a significant source of NH3 to the atmosphere. In the absence of exogenous inputs, NH4+ in soils is derived from the mineralization of soil organic N. Loss of NH3 is affected by the rate of nitrification, cation exchange and biotic immobilizations that compete for NH4+. Plant growth in many desert ecosystems is limited by available N... more


  • Dataset: Abrasion of crust at Scrape Site
Project ID: PRL2002025
Abstract:

The project was designed to test the hypothesis that the abrasion of a surface crust is proportional to the vertical flux of kinetic energy delivered by saltating sand grains. This flux energy is related to the mass flux of saltating grains. The site was selected since it had a flat crust that was not greatly effected by atmospheric precipitation or freeze/ thaw and moistening/drying cycles. The objective of the project was to measure the kinetic energy flux during... more


  • Dataset: Grama/Mesquite Leaching Mineralization Potential Survey
Project ID: 210395000
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.


  • Dataset: Horizontal sand mass flux data Derived from 5-stage BSNE collectors at 15 NPP sites and Geomet site
Project ID: 210288000
Abstract:

Collections of airborne sand are obtained at 16 locations at the Jornada LTER area, 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 horizontalflux 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 are 5, 10, 20, 50, and 100... more


  • Dataset: Surface Soil Microarthropods
  • Dataset: Deep Core Soil Saturation Extracts
  • Dataset: Deep Soil Core Nutrients
  • Dataset: Deep Soil Cores N-Mineralization
  • Dataset: Deep Soil Core Micronutrients
  • Dataset: Deep Soil Microarthropods
  • Dataset: Surface Soil Nematodes
  • Dataset: Surface Soil Nutrients
  • Dataset: Surface Soil Canopy Position Nutrients
Project ID: 210394000
Abstract:

In the Chihuahuan Desert of southern New Mexico, mesquite occurs in a variety of landscape populations where water may accumulate: at depth from channeling and concentration of water into low-lying areas (playas and arroyos); in high infiltration soils which permit deep infiltration and limit evaporation (dunes); and, as scattered individuals expanding into former grasslands where rooting is limited to the depth of infiltration of incident rainfall. We hypothesized... more


  • Dataset: NPP Soil Water Content
  • Dataset: NPP Soil Water Content Raw Data
Project ID: 210013000
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 NPP 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 a layer of impenetrable caliche. Converted water content values are a... more


  • Dataset: Horizontal sediment mass flux before & after the windy season from vegetation removal plots(Sediment weight at various heights)
Project ID: 210301000
Abstract:

In a large-scale grass removal experiment (NEAT), we identified several important thresholds that impact the conversion of grasslands to shrublands. Between 75%-100% grass loss, aeolian transport increases dramatically, but carbon and nitrogen in windborne sediment display another threshold between 50%-75% grass loss (Li et al. 2007). With lower grass cover, nutrient additions to the soil are overwhelmed by aeolian emissions, resulting in a net loss of soil... more


  • Dataset: Soil movement across black grama-mesquite ecotones beginning in 1933
Project ID: 210365000
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... more


  • Dataset: Soil nutrient distribution in long-term NPP plots- 1989
Project ID: 210398000
Abstract:

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... more


  • Dataset: Soil nutrient distribution in long-term NPP plots - 1991
Project ID: 210398000
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... more


  • Dataset: Transect Soil Nitrogen
Project ID: 210399000
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,... more


  • Dataset: Transect Total Nitrogen in Soil
  • Dataset: Transect Particle Size Analysis
  • Dataset: Transect Soil Phosphate
  • Dataset: Transect Soil Cations
Project ID: 210400000
Abstract:

Soils were collected from LTER I transects and analyzed for various characteristics including particle size, cations, moisture content, total nitrogen and PO4-P. Transects pass across different vegetation zones of the Jornada Basin.


  • Dataset: Transect Soil Water Content Raw Data - Early Format
  • Dataset: Transect Soil Water Content Raw Data
  • Dataset: Transect Soil Water Content
Project ID: 210012000
Abstract:

Soil water content measurements 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 (19 access tubes) on the nitrogen fertilized Treatment transect using a neutron probe (Campbell Model 503DR Hydroprobe). Transects are 2.7 km in length and run parallel to each other with the center line of each transect approximately 75 meters apart. Stations are 30 meters apart. Measurements are taken at 30cm... more


  • Dataset: Transect Soil Water Potential - 1988
  • Dataset: Transect Soil Water Potential 1986 - 1987
Project ID: 210401000
Abstract:

Soil water potential for 1986 - 1988 measured with screen-cage soil psychrometers along treatment and control transects every 5 stations (30 meter intervals) at 5cm, 15cm and 30cm depths. Data include Soil temperatures and Soil Water Potential at 3 depths. Dew Point and calibration slope and intercept for each psychrometer are included in order to convert microvolt readings to -bar readings.