black grama

Dataset: 

Study number: 

39

Data set ID: 

210392001

Date range: 

1939-01-01 to 2001-12-31

Original investigator: 

Ken A Valentine

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 1947, 1956, 1960, 1967, 1989, 1995, and 2001 for Gravelly Ridges and 1939, 1947, 1960, 1967, and 2001 for Dona Ana and Parker Tank using the same methods. Treatments were applied factorially yielding a control plot, single factor plots, and plots with varying degrees of combinations of factors. The factors were lagomorph exclusion (using wire fencing), shrub removal (hand grubbing at the ground surface), furrowing (shallow, hand raked furrows to trap surface water), and seeding (broadcast applications of seeds of native perennials). Seeding and furrowing treatments were only applied in 1939. Lagomorph exclusion has persisted since establishment, and shrub removal treatments have been reapplied immediately following all years of vegetation sampling. This study is complete.

For more information, refer to:

Havstad, K.M., R.P. Gibbens, C.A. Knorr, and L.W. Murray. 1999. Long-term influences of shrub removal and lagomorph exclusion on Chihuhuan Desert vegetation dynamics. Journal of Arid Environments 42: 155-166.

 

Data download: 

Description: 

<p>Data file information for the following Jornada data set: Line intercept data of long-term vegetation responses to shrub removal and lagomorph exclusion in a creosotebush community</p&g

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LTER Core Area(s): 

Dataset: 

Study number: 

372

Data set ID: 

210372001

Date range: 

1984-08-20 to 1985-12-22

Original investigator: 

Walter G Whitford

Data contact: 

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 stage of the litter.

Data download: 

Description: 

Data file information for the following Jornada data set: Transect Leaf-litter Microarthropod Data

LTER Core Area(s): 

Dataset: 

Study number: 

395

Data set ID: 

210395001

Date range: 

1986-05-12 to 1986-05-13

Original investigator: 

Fred Fisher

Data contact: 

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. Measurements made of inorganic soil nitrogen.

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. Measurements made of inorganic soil nitrogen.

Data download: 

Description: 

Data file information for the following Jornada data set: Grama/Mesquite Leaching Mineralization Potential Survey

LTER Core Area(s): 

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