completed

Data set status is completed, indicating that data is no longer being collected

Dataset: 

Study number: 

308

Data set ID: 

210308005

Date range: 

2008-05-02 to 2016-08-05

Original investigator: 

Jeff Herrick

Data contact: 

Abstract: 

    Repeat digital groundbased photos are taken once to twice a year to document plant litter and
    soil deposition or removal by wind and water transport on ten microplots located on each of the
    8 plots at each of the Aeolian, Dona Ana, and Gravelly Ridges sites. Five photos are taken of

    Repeat digital groundbased photos are taken once to twice a year to document plant litter and
    soil deposition or removal by wind and water transport on ten microplots located on each of the
    8 plots at each of the Aeolian, Dona Ana, and Gravelly Ridges sites. Five photos are taken of
    each microplot: One overhead (from directly over the microplot) and 4 lateral views at ground
    level of the microplot from each cardinal direction.

   Digital filenames are fully descriptive of the site, plot, microplot, photo view, and date taken.
   Photo filename structure:
      Example: A1-1E_20101109_IMG_1006368.jpg
               12-34_55556677_88888888888.jpg
         Where 1 = site: A=Aeolian: D=Dona Ana; G=Gravelly Ridges
               2 = plot (1-8)
               3 = microplot (1-10)
               4= photo view (O=overview; E=looking east; N=looking north; S=looking south; W=looking west
               5-6-7 = year month day of photo
               8 = original image number assigned by camera

Data download: 

Description: 

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Connectivity Microplot Repeat Photos

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Connectivity Microplot Repeat Photos

Keywords: 

Dataset: 

Study number: 

308

Data set ID: 

210308003

Date range: 

2008-09-23 to 2010-11-01

Original investigator: 

Jeff Herrick

Abstract: 

    Material moved from the overland flow of water resulting from precipitation is collected in
    belowground containers to get an estimate of that material entering and exiting the plots.
    Water and material collected in a container solely from a rain or wind event is not collected.

    Material moved from the overland flow of water resulting from precipitation is collected in
    belowground containers to get an estimate of that material entering and exiting the plots.
    Water and material collected in a container solely from a rain or wind event is not collected.
    Bedload oven-dry weight is obtained and the percent Loss on Ignition is calculated.

Data download: 

Description: 

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Bedload data

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Bedload data

Dataset: 

Study number: 

301

Data set ID: 

210301002

Date range: 

2010-04-01 to 2012-10-31

Original investigator: 

Dan Hewins

Data contact: 

Abstract: 

Mesquite litter mass loss from decomposition associated with soil-litter mixing.

 

Mesquite litter mass loss from decomposition associated with soil-litter mixing.

 

Decomposition models typically under-predict decomposition relative to observed rates in drylands. This discrepancy indicates a significant gap in our mechanistic understanding of carbon and nutrient cycling in these systems. Recent research suggests that certain drivers of decomposition that are often not explicitly incorporated into models (e.g., photodegradation and soil-litter mixing; SLM) may be important in drylands, and their exclusion may, in part, be responsible for model under-predictions. To assess the role of SLM, litterbags were deployed in the Chihuahuan Desert and interrelationships between vegetation structure, SLM, and rates of decomposition were quantified. Vegetation structure was manipulated to simulate losses of grass cover from livestock grazing and shrub encroachment. I hypothesized that reductions in grass cover would promote SLM and accelerate mass loss by improving conditions for microbial decomposition.  

 

For more see: Hewins, D. B., S. R. Archer, G. S. Okin, R. L. McCulley, and H. L. Throop. 2013. Soil-litter mixing accelerates decomposition in a Chihuahuan Desert grassland. Ecosystems 16:183-195

Data download: 

Description: 

Dataset: 

Study number: 

301

Data set ID: 

210301001

Date range: 

2010-04-01 to 2012-10-31

Original investigator: 

Dan Hewins

Data contact: 

Abstract: 

The effect of vegetation structure on soil-litter mixing (SLM) and decomposition was explicitly tested in a litterbag experiment on a Chihuahuan Desert grassland site where vegetation cover was manipulated to simulate the progressive loss of grass cover accompanying livestock grazing and woody plant encroachment.  We hypothesized that (i) reductions in grass cover would destabilize soi

The effect of vegetation structure on soil-litter mixing (SLM) and decomposition was explicitly tested in a litterbag experiment on a Chihuahuan Desert grassland site where vegetation cover was manipulated to simulate the progressive loss of grass cover accompanying livestock grazing and woody plant encroachment.  We hypothesized that (i) reductions in grass cover would destabilize soils and promote SLM, and (ii) that SLM would enhance microbial abundance and alter microbial community composition in ways that accelerate decomposition. To test our hypotheses, we quantified mass loss, and chemistry of litter incubated on sites with experimental reductions in grass cover (0 to 100% removals) over a 12-month period.  This dataset is of the percent carbon, percent nitrogen, and the carbon to nitrogen ratio.

Data download: 

Description: 

Dataset: 

Study number: 

120

Data set ID: 

210120002

Date range: 

1982-10-01 to 1992-09-11

Original investigator: 

Walter G Whitford

Data contact: 

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 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 download: 

Description: 

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: East and west boundary fence plant line intercepts - percent cover for 9 species 1982-1992

Dataset: 

Study number: 

425

Data set ID: 

210425001

Date range: 

1980-01-01 to 2010-12-31

Original investigator: 

Jin Yao

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.

Data download: 

Description: 

Data file for the Estimated daily precipitation at the 15 ANPP sites: 1980-2010 dataset

Data file for the Estimated daily precipitation at the 15 ANPP sites: 1980-2010 dataset

Keywords: 

Dataset: 

Study number: 

8

Data set ID: 

210008001

Date range: 

1996-02-16 to 2001-08-17

Original investigator: 

David Lightfoot

Data contact: 

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 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 will be collected for the duration of the LTER program in order to provide data to test these hypotheses. Data for arthropods captured in pitfall traps on LTER III consumer plots at 2 month intervals. Data includes order, family, genus, species, and number.

Description: 

Data file information for the following Jornada data set: Arthropod Pitfall Traps-III in 5x1 grid at LTER II NPP sites

Dataset: 

Study number: 

40

Data set ID: 

210409002

Date range: 

2007-07-25 to 2008-09-20

Original investigator: 

Heather Throop

Data contact: 

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.

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.

Description: 

Data file information for the following Jornada data set: Pre-dawn water potential for leaves from 5 precipitation treatments

Dataset: 

Study number: 

40

Data set ID: 

210409001

Date range: 

2007-07-25 to 2008-09-20

Original investigator: 

Heather Throop

Data contact: 

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.

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.

Description: 

Data file information for the following Jornada data set: Photosynthetic rates for leaves from 5 precipitation treatments

Dataset: 

Study number: 

384

Data set ID: 

210384001

Date range: 

2000-03-24 to 2000-08-29

Original investigator: 

Debra Peters

Data contact: 

Abstract: 

LTER-I Transect plant line intercept data. This data set is as transcribed (UNSORTED) from cassette tape with one intercept observation per record. Data consist of week number, transect, station, segment number, plant species, and length of species intercepted by line stretched between 2 rebar the length of the 30 meter plant line intercept transect.

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. Each plant line transect is divided into 6 5-meter segments. Annuals are measured only in the first meter of segments 1, 2, and 3 and in the last meter of segments 4, 5, and 6. Perennials are measured for the full length of all segments. On March 19, 2000, an arson burn occurred of 2.5 acres of the upper grassland area on the Summerford bajada just below the powerline road. The area affected included portions of the LTER-I Transect Plant Line Intercept study that was begun in 1982. To evaluate the impact of the burn on those lines, the line intercepts were read for the upper grassland area extending from immediately above the creosotebush fringe to the base of Summerford Mountain. The stations measured were C73-C89, T75-T90, and X76-X91 (Control, Treatment, and Alternate Control, respectively). Measurements were made immediately after the burn, after the spring growing season, and after the fall growing season in 2000 only. In the initial sampling period, the burn area intercepted by the line was noted in the data set using a "species" code of BURN. 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.

Description: 

Data file information for the following Jornada data set: Arson burn on LTER-I Transect plant line intercepts - field data (tape format)

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