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4 results for “creosotebush”
Rabbit survey data on creosotebush and grassland routes from the long-term Small Mammal Exclusion Study at Jornada Basin LTER, 1996-ongoing
This data package contains rabbit survey data from grassland and creosote shrubland habitats on Jornada Experimental Range (JER) and Chihuahuan Desert Rangeland Research Center (CDRRC) lands. Two survey routes were established along Jornada Basin roads in 1996; one in black grama grassland and the other in creosotebush shrubland. Quarterly surveys are conducted on these roads at or near the full moon to measure the density of rabbits in the two vegetation types. Each route is about 6 miles long. Parallel studies were established at the Sevilleta LTER site (New Mexico, USA) and Mapimi Biosphere Reserve (Durango, Mexico). Data collection began in April 1996 and includes date and time lagomorphs are spotted, species identification, habitat type, distance/direction from vehicle, and comments on the weather, moon, and anything unusual. This study is ongoing with new data collected quarterly.
Plant cover on 2 x 2 meter rainfall runoff plots in grassland and creosotebush communities at the Jornada Basin LTER, 1989-1990
This data package contains plant cover measurements collected at natural rainfall-runoff plots installed on lands managed by the Chihuahuan Desert Rangeland Research Center (CDRRC) and the Jornada Experimental Range (JER) during the early years of Jornada Basin LTER (LTER-I and II). The purpose of this study was to quantify plant cover and phenology in grassland and creosote bush in runoff study plots, including those that included a termite removal treatment. Plant cover was measured on 20 2 x 2 meter hydrology runoff plots located in zones dominated by either creosotebush or grassland using sampling quadrats divided into 10 x 10 cm units. The number of 10x10cm squares occupied each by plant species was counted and scaled up to determine the total percent cover of each species per plot. Data recorded includes plant species codes, raw cover, percent cover, height of vegetation, and phenology. This study was completed in October 1990.
Rainfall runoff and sediment deposition from 2 x 2 meter plots in grassland and creosotebush communities at the Jornada Basin LTER, 1982-1994
This data package contains data from natural rainfall-runoff plots installed on lands managed by the Chihuahuan Desert Rangeland Research Center (CDRRC) and the Jornada Experimental Range (JER) during the early years of Jornada Basin LTER (LTER-I and II). The purpose of this study was to measure infiltration and runoff rates related to rain event duration and intensity, and soil and organic movement in creosotebush and grassland areas. In addition, some plots were treated with chlordane to remove termites. Nine hydrology runoff plots in the creosotebush sites (Larrea tridentata) were established in 1983 and 12 black grama (Bouteloua eriopoda) grassland runoff plots were established in 1989. Each plot was 2 × 2 square meters and surrounded on 3 sides by a metal frame. Rainfall was collected using a 10-cm diameter PVC pipe and a 120-liter tub. There are 4074 plot-events or observations in the data set. The data set includes the date of the rainfall event, relative cover of vegetation, sediment concentration in runoff (mg/l), precipitation (mm), deposited sediment, and percent carbon. This study began in fall 1982 and was completed in fall 1994.
Rainfall runoff water chemistry from 2 x 2 meter plots in grassland and creosotebush communities at the Jornada Basin LTER, 1988-1990
This data package contains data from natural rainfall-runoff plots installed on lands managed by the Chihuahuan Desert Rangeland Research Center (CDRRC) and the Jornada Experimental Range (JER) during the early years of Jornada Basin LTER (LTER-I and II). The purpose of this study was to analyze dissolved chemicals in surface runoff after precipitation events from creosotebush and grassland areas. In addition, some plots were treated with chlordane to remove termites. Nine hydrology runoff plots in the creosotebush sites (Larrea tridentata) were established in 1983 and 12 black grama (Bouteloua eriopoda) grassland runoff plots were established in 1989. Chemical analyses began in 1988 (1989 for grassland plots). Each plot was 2 × 2 square meters and surrounded on 3 sides by a metal frame. At the lower slope of the plot is a trough that collects the runoff for analysis. The data set includes the date of sampling, plot IDs, volume (L) of surface water runoff collected, and concentrations of F, Cl, NO3, SO4, NH4, Ca, Mg, Na, K, total N, and total P in mg/L. This study was completed in fall 1990.
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