Long-Term and Short-Term Data by Research Area

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plant projects

Displaying 1 - 10 of 10 Research Projects

  • Dataset: Conmod Pilot Study: Annual plant canopy gap and basal gap intercept data
  • Dataset: Conmod Pilot Study: Annual vegetation transect Line Point Intercept measurements
  • Dataset: Conmod Pilot Study: Connectivity Microplot Repeat Photos


Project ID: 210308000
Abstract:
This study is designed to generate predictions about the density, spatial arrangement and cover of obstructions to wind and water necessary to promote grass recovery in
shrub-dominated plant communities in the northern Chihuahuan Desert.  Specifically, we would like to "(a) to understand the density of vegetation regrowth in intershrub areas(such as we have seen as a result oi last summer) necessary for it to become self-sustaining and engender... more

  • Dataset: Ecotone Study: Quadrat Plant Measurement Data
  • Dataset: Ecotone Study: Plant Above Ground Net Primary Productivity by Site
  • Dataset: Ecotone Study: Plant Above Ground Net Primary Productivity by Plant Form


Project ID: 210262000
Abstract:

OBJECTIVE:

The purpose of the study is to investigate how pulses of precipitation translate into pulses of plant aboveground net primary productivity (NPP) and how the small mammal community responds to such changes also in relation to shrub gradient across the landscape. Particularly we are interested in how the energy flows through the ecosystem in response to pulses of rain, how the small mammal community partition resources (in terms of C3 (forbs and... more


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


Project ID: 210120000
Abstract:

PURPOSE:

Investigate the response of vegetation with respect to landscape characteristics as well as release from grazing through vegetation monitoring across fence lines of grazed and ungrazed pastures.

INTRODUCTION.

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... more


  • Dataset: Plant Cover in Precipitation and Nitrogen Manipulation Plots on the Jornada Basin, 2007-2009


Project ID: 210278000
Abstract:

On a continental scale, a strong spatial correlation between precipitation and aboveground net primary production (ANPP) gives us great confidence that precipitation is the primary driver of ANPP in arid and semi-arid ecosystems, which occupy nearly 40% of the Earth's land surface. However, as a series of comparable long-term data sets have become available in recent years, the relationship has not held up in a temporal context; annual precipitation accounts for... more


  • Dataset: Jornada Experimental Range permanent quadrat chart data beginning 1915 - plant density
  • Dataset: Jornada Experimental Range Permanent Quadrat Chart data beginning 1915 - plant cover


Project ID: 210351000
Abstract:
Permanent quadrats record vegetation changes since 1915 in a range of vegetation and soil texture types. More than 100 1 x 1 m**2 quadrats were set up between 1915 and 1932 to study the response of major forage species to cattle grazing and precipitation. A pantograph was used to chart the following variables:
  1. basal area of perennial grasses,
  2. locations of annual grasses, forbs, and shrubs, and sometimes
  3. canopy cover of... more

  • Dataset: Stressor II transect line point intercept data


Project ID: 210461000
Abstract:

The objective of this project is to determine the effect of multiple stressors (grazing and shrub removal) on the decline and recovery of perennial grasses in a black grama-mesquite savanna on sandy soils. The initial savanna state represents an intermediate and possibly stable state between black grama grassland and mesquite shrubland. The experimental manipulations removed about 60% of aboveground herbaceous biomass over 24-36 hour periods in each of four years (... more


  • Dataset: Plant phenology transect at NPP sites


Project ID: 210287000
Abstract:

The phenological stage of select perennial plant species on the 15 NPP sites is recorded on a monthly basis. This allows us to track the influence of weather and of site differences on plant reproduction. The boundaries of the (80m x 80m) study plot are walked and each individual plant of any perennial species in a 1-m belt is examined and its phenology noted (non-reproductive, in bud, in flower, in fruit, or dormant). Data are summarized as the percentage of total... more


  • Dataset: NPP Study: Annual ground-based photographs of 15 NPP sites beginning 1996
  • Dataset: NPP Study: Quadrat biomass data
  • Dataset: NPP Study: Quadrat field measurement data
  • Dataset: NPP Study: Reference harvest data
  • Dataset: NPP Study: Annual aboveground net primary production, summary by site


Project ID: 210011000
Abstract:

Deserts and semi-deserts are characterized as ecosystems of low primary productivity, but a more pertinent trait is the variability of plant production in space and time. In dryland ecosystems there are usually some locations on the landscape (e.g., sites receiving run-on moisture from adjacent areas) and some time periods where plant growth is lush in response to temporary favorable conditions. Our objective in monitoring net primary production, therefore, is to... more


  • Dataset: Transect plant line intercepts - percent cover by species


Project ID: 210119000
Abstract:

INTRODUCTION. 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... more


  • Dataset: Line Intercept Data of Long-term Vegetation Responses to Shrub Removal and Lagomorph Exclusion in a Creosotebush Community on the Jornada Experimental Range,1939-2001


Project ID: 210392000
Abstract:

Three exclosure sites each with sixteen 21.3 x 21.3 m plots were established in 1938/39 to evaluate the effects of lagomorph exclusion and shrub removal in a creosotebush dominated community. The study sites, developed by Ken Valentine, were placed on the Jornada Experimental Range at the following locations: 1) outside the southeast corner of the Gravelly Ridges Artificial Revegetation Enclosure, 2) about one half mile southwest of Parker Tank, and 3) inside the... more