Vegetation Dynamics

Dataset:

Aboveground net primary productivity across inter-annual precipitation variability treatments at a grassland site in the Jornada Basin, 2009-2014

Study number:

328

Data set ID:

210328001

Abstract:

This ongoing dataset contains annual aboveground net primary productivity (ANPP) data from a study at the Jornada Experimental Range (JER) in southern New Mexico. The study was designed to assess the effect of interannual variability in precipitation on average aboveground net primary productivity (ANPP) in Chihuahuan Desert grasslands. The study began in 2009, has five precipitation treatments (see Methods) and contains 50 plots (10 per treatment). This data package contains 6-year (2009 to 2014) means of ANPP per plot. Annual and more recent data are available and will be released pending an upcoming publication.

Figure of 6-year ANPP by plant functional group: https://jornada.nmsu.edu/sites/jornada.nmsu.edu/files/files/data/ANPP_figure.jpg

Location of dataset on EDI: https://portal.edirepository.org/nis/metadataviewer?packageid=knb-lter-jrn.210328001.1

Data sources:

ANPP_6yr_means_precip_variability

LTER Core Area(s):

Primary Production

Keywords:

Dataset:

Conmod Pilot Study: Connectivity Microplot Repeat Photos

Study number:

308

Data set ID:

210308005

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
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 sources:

photos_Jornada_308005_conmod_pilot

LTER Core Area(s):

Disturbance

Keywords:

photo point imagery

Dataset:

Conmod Pilot Study: Annual vegetation transect Line Point Intercept measurements

Study number:

308

Data set ID:

210308002

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
(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 sources:

data_Jornada_308001_conmod_pilot_plant_line

LTER Core Area(s):

Disturbance, Populations

Keywords:

vegetation dynamics

Dataset:

Conmod Pilot Study: Annual plant canopy gap and basal gap intercept data

Study number:

308

Data set ID:

210308001

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 sources:

data_Jornada_308001_conmod_pilot_gap

LTER Core Area(s):

Disturbance, Populations

Keywords:

canopy gaps

Project:

Cross-scale Connectivity Experiment - Pilot

Study Number: 308

Project ID:

210308000

Original Investigator:

Debra Peters

Funding Source:

NSF

Research Area:

Vegetation Dynamics

Data Category:

Plant

Dataset:

Soil Water Content in Experimental Precipitation Manipulation Plots on the Jornada Basin, 2007-2009

Study number:

27

Data set ID:

210278001

Abstract:

A 2-year experiment with ambient, reduced, and enhanced precipitation was designed to compare the performance of the encroaching C₃ shrub (honey mesquite Prosopis glandulosa) to the dominant C₄ grass (black grama Bouteloua eriopoda) in terms of photosynthetic rates and leaf water status. Precipitation manipulations dramatically enhanced natural variability and generated a range of rainfall scenarios that could have only been studied only after a multi-decade effort using natural conditions. Responses were highly asymmetric, with precipitation (PPT) additions generally influencing volumetric water content (vwc) to a greater extent than PPT reductions. Desert soils are usually close to their minimum water content and thus when soils were dry, the effects of reducing PPT were relatively minor compared to the effects of adding PPT. Volumetric soil water content was, on average, lower and more variable at the shallower (0–5 cm) depth (mean 9.3 ± 0.14%; range 5.7–14.3%) than at the deeper (30–50 cm) depth (mean 14.4 ± 0.12%; range 10.8–18.1%. This study is complete. For further information and results, see:

Throop, H., L. G. Reichmann, Os. Sala, and S. Archer. 2012. Response of dominant grass and shrub species to water manipulation: an ecophysical basis for shrub invasion in a Chihuahuan desert grassland. Oecologia 169: 373-383.

Data sources:

JornadaStudy_278_changes_in_npp_water_availability_soil_water_content_data

LTER Core Area(s):

Inorganic Nutrients

Dataset:

East and west boundary fence plant line intercepts - percent cover for 9 species, Jornada Basin, 1982 to 1992

Study number:

120

Data set ID:

210120002

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 sources:

data_JRN_120002_fence_plant_line_intercept_percent_cover_1982_92

LTER Core Area(s):

Populations, Primary Production

Dataset:

Jornada Experimental Range permanent quadrat chart data beginning 1915 - plant density

Study number:

351

Data set ID:

210351002

Abstract:

The data set, along with other long-term data collected at multiple spatial scales, is being used to identify the landscape, climatic, and anthropogenic factors that influence grass abundance, growth, and persistence. Variable measured is plant density by species.

Data sources:

JornadaStudy_351_permanent_chart_quadrat_perennial_forb_density_data

LTER Core Area(s):

Primary Production

Dataset:

Jornada Experimental Range Permanent Quadrat Chart data beginning 1915 - plant cover

Study number:

351

Data set ID:

210351001

Abstract:

The data set, along with other long-term data collected at multiple spatial scales, is being used to identify the landscape, climatic, and anthropogenic factors that influence grass abundance, growth, and persistence. Variables measured are basal area of grasses, canopy area of shrubs, and perimeters of both.

Data sources:

JornadaStudy_351_permanent_chart_quadrat_perennial_forb_density_data

LTER Core Area(s):

Populations, Primary Production

Keywords:

Project:

Jornada Experimental Range Permanent Quadrat Chart Data beginning 1915

Study Number: 351

Project ID:

210351000

Funding Source:

USDA

Research Area:

Vegetation Dynamics

Data Category:

Plant

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