Disturbance

LTER Core Area: Disturbance

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: 

210308004

Date range: 

2008-06-02 to 2015-05-27

Original investigator: 

Greg Okin

Data contact: 

Abstract: 

    There are 3 sites for this study:  Gravelly Ridges, Aeolian, and Dona Ana.  Within each site,
    there are 8 plots.  The plots are 8x8 meters and have an 8x8 buffer zone on both sides of the
    plot (up and down).  There are four BSNE stands for each plot, 2 in each of the 2 buffer zones

    There are 3 sites for this study:  Gravelly Ridges, Aeolian, and Dona Ana.  Within each site,
    there are 8 plots.  The plots are 8x8 meters and have an 8x8 buffer zone on both sides of the
    plot (up and down).  There are four BSNE stands for each plot, 2 in each of the 2 buffer zones
    (8 collectors per plot).  Each stand contains 2 BSNE collectors with the collection opening at
    10cm and 30cm height and an opening of 2 cm wide and 5 cm height.  These BSNE collectors are in
    a fixed position pointing into the direction of the prevailing wind, which corresponds to the
    plot alignment.  The collectors in the upwind buffer are facing away from the plot and the
    collectors in the downwind buffer are facing into the plot.  The idea is the upwind BSNEs
    measure the amount of dust entering the plot, and the downwind BSNEs measure the amount of dust
    moving off the plot.  This provides a measure of the effectiveness of the plot obstructions to
    wind blown dust.  It is important the BSNEs are fixed in an orientation that points across the
    full length of the plot.
 

Data download: 

Description: 

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  BSNE Dust Collection Data

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  BSNE Dust Collection Data

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: 

407

Data set ID: 

210407001

Date range: 

1976-04-22 to 2010-12-31

Original investigator: 

Eddie Garcia

Data contact: 

Abstract: 

    This data set is comprised of daily precipitation totals, in inches, measured by Belfort
     Instruments weighing rain gauges at 58 locations on the Jornada Experimental Range.
     Locations and the dates during which data were collected at them were generally project-oriented.
     See comment section (#20) for start and end dates for each location.

    This data set is comprised of daily precipitation totals, in inches, measured by Belfort
     Instruments weighing rain gauges at 58 locations on the Jornada Experimental Range.
     Locations and the dates during which data were collected at them were generally project-oriented.
     See comment section (#20) for start and end dates for each location.

    Days on which data could not be obtained (due to equipment failure, user error, and/or
     other reasons) are flagged as missing within this dataset.  As of 31 December 2008 they
     comprised 1,270 of the total 291,465 records, which is less than 0.44% of the data set.
 

Data download: 

Description: 

Data file information for the following Jornada data set: USDA-ARS Jornada Experimental Range Recording (Weighing) Rain Gauge Daily Data begins 1976

Data file information for the following Jornada data set: USDA-ARS Jornada Experimental Range Recording (Weighing) Rain Gauge Daily Data begins 1976

Keywords: 

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: 

461

Data set ID: 

210461001

Date range: 

1996-02-27 to 2009-10-27

Original investigator: 

Kris Havstad

Abstract: 

The goal of this sampling effort is to describe the vegetation response to treatments.  Data were collected following the line-point intercept method (Herrick et al.

2009).  Although the original LPI data set was in multivariate form with separate columns for canopy layers and soil surface, this data set has been transposed into vertical form, implementing a “layer” variable, so that all species and soil surface codes appear in one column.  Within each exclosure, 4837 points were sampled with the following exceptions:

year

exclosure

total_points_sampled

1996

5

4825

1996

7

4836

1996

9

4836

1996

10

4836

1997

1

4830

1997

2

4830

1997

3

4830

1997

4

4830

1997

5

4830

1997

6

4830

1997

7

4830

1997

8

4830

1997

9

4830

1997

10

4830

1997

11

4830

1997

12

4830

1997

13

4830

1997

14

4830

1997

15

4830

1997

16

4830

1997

17

4830

1997

18

4830

2002

12

4835

 

Data download: 

Description: 

Dataset: 

Study number: 

228

Data set ID: 

210228001

Date range: 

2008-03-18 to 2015-06-11

Original investigator: 

Dale A Gillette

Data contact: 

Abstract: 

Dataset consists of horizontal dust flux at multiple heights from BSNE dust collectors located in treatment plots (different percent vegetation removed) and adjacent downwind effect plots. Year 2008 was an annual collection. Collection in subsequent years occurred before and after the wind season.
The experiment was designed to test the effects of increasing wind erosion on soil and vegetation properties at the Jornada.  In order to increase wind erosion rates, vegetation was removed to increase bare surface area and stimulate erosion (the less vegetation present the greater the wind erosion).  The basic experimental design includes three treatment blocks.  Each block has four treatment plots with different level of vegetation removed (25-100%) and a control treatment.  Treatment plots are 25x50m with 25m buffers between.  The vegetation removal includes grasses and small shrubs (like XASA and ZIGR), but not mesquite or yucca or any of the larger shrubs).  Also, adjacent downwind plots are included in the design.  These plots are strictly for monitoring of soil and vegetation properties, so no maintenance is required on these areas.

Data download: 

Description: 

Keywords: 

Dataset: 

Study number: 

308

Data set ID: 

210308002

Date range: 

2008-06-10 to 2012-06-28

Original investigator: 

Debra Peters

Data contact: 

Abstract: 

    Line-Point Intercept data are collected annually for this project beginning in 2008. No data were
    collected in 2011. There are 4 pairs of plots consisting of control and treatment. Each plot is
    8x8 meters with an 8x8 meter buffer plot above and below it. Treatment plots have connectivity modules
    Line-Point Intercept data are collected annually for this project beginning in 2008. No data were
    collected in 2011. There are 4 pairs of plots consisting of control and treatment. Each plot is
    8x8 meters with an 8x8 meter buffer plot above and below it. Treatment plots have connectivity modules
    (conmods) installed to decrease gap size between perennials.  Buffer plots do not have conmods.
    Four 24-meter transects run through the plot and 2 buffer plots. These transects are spaced
    0.8, 2.8, 4.3, and 7.2 meters across the plots (denoted as 1, 3, 5, and 7 meters in the database),
    paralleling the long axis of the combined buffer plots and central plot.
         Aeolian site:         Control plots 2,4,5,8  Treatment plots 1,3,6,7
         Dona Ana site:        Control plots 2,4,5,7  Treatment plots 1,3,6,8
         Gravelly Ridges site: Control plots 1,3,5,7  Treatment plots 2,4,6,8
 

Data download: 

Description: 

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Annual vegetation transect Line Point Intercept measurements

Data file (CSV) for Jornada dataset: Conmod Pilot Study:  Annual vegetation transect Line Point Intercept measurements

Keywords: 

Dataset: 

Study number: 

308

Data set ID: 

210308001

Date range: 

2008-06-10 to 2012-06-28

Original investigator: 

Debra Peters

Data contact: 

Abstract: 

Canopy Gap and Basal Gap Intercept data are collected annually for this project beginning in 2008. No data were collected in 2011. There are 4 pairs of plots consisting of control and treatment. Each plot is 8x8 meters with an 8x8 meter buffer plot above and below it. Treatment plots have connectivity modules (conmods) installed to decrease gap size between perennials.
Buffer plots do not have conmods. Four 24-meter transects run through the plot and 2 buffer plots. These transects are spaced 0.8, 2.8, 4.3, and 7.2 meters across the plots (denoted as 1, 3, 5, and 7 meters in the database), paralleling the long axis of the combined buffer plots and central plot.
Aeolian site:                Control plots 2,4,5,8  Treatment plots 1,3,6,7
Dona Ana site:            Control plots 2,4,5,7  Treatment plots 1,3,6,8
Gravelly Ridges site:  Control plots 1,3,5,7  Treatment plots 2,4,6,8

Data download: 

Description: 

Data file (CSV) for the Jornada dataset: Conmod Pilot Study:  Annual plant canopy gap and basal gap intercept data

Data file (CSV) for the Jornada dataset: Conmod Pilot Study:  Annual plant canopy gap and basal gap intercept data

Keywords: 

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