Data Set section used by Workbench Access
Data file (CSV) for Jornada dataset: Conmod Pilot Study: Annual vegetation transect Line Point Intercept measurements
Data file (CSV) for the Jornada dataset: Conmod Pilot Study: Annual plant canopy gap and basal gap intercept data
Precipitation at 1 minute intervals for rain gauges 2-5 with R1 excluded due to periods of interruption. Spatially averaged rainfall over the watershed is calculated in this dataset based on relative coverage of each rain gauge determined from a Theissen polygon map.
This files presents all of the flux data post-EdiRe processing at 30 minute resolution. Included in this file is: Ux = Mean wind speed in the x-direction, Uy = mean wind speed in the y-direction, Uz = mean wind speed in the z-direction, Co2 = CO2 atmospheric concentrations, H2O = Water atmospheric concentrations, Press = barometric pressure, Air Temp = atmospheric temperature, wind speed = mea
n wind speed towards 216 degrees from north, H Flux = sensible heat flux, LE Flux = latent heat flux, C Flux = carbon flux.
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.
Data file (comma-separated value text) contains the data for the Jornada dataset: Abrasion of Crust at Scrape Site
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 of component landforms from the foot of the mountain to the basin floor. This provided the opportunity to investigate the response of vegetation with respect to landscape characteristics as well as release from grazing. This summary data set consists of percent cover of 9 species from the plant line intercept measurements on either side of the LTER-I exclosure East and West boundary fence. Data is sorted by station, species i.d., then line segment. Along the East Boundary fence, the east side is ungrazed (control) and the west side is grazed (treatment). Along the West Boundary fence, the east side is grazed and the west side is ungrazed. Each plant line transect is divided into 6 5-meter segments. All perennials were measured at about 5 year intervals as the length of intercept along a 30-meter line perpendicular to the fence. Summary data includes only four of the 6 5-meter intervals due to disturbance along fenceline. Data from the 5-meter segment on either side of the fence was not included in summarizing the data. Summary data includes only 9 of the perennial species.
Data file information for the following Jornada data set: East and west boundary fence plant line intercepts - percent cover for 9 species 1982-1992
Data file information for the following Jornada data set: Wetfall deposition chemistry data
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.
Data file information for the following Jornada data set: Arthropod Pitfall Traps-III in 5x1 grid at LTER II NPP sites