Jornada Basin LTER Research Projects

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Displaying 1 - 25 of 41 Research Projects
Project ID: 210169000
Abstract:

Atmospheric deposition as found in dryfall (dust) and wetfall precipitation has been collected and analyzed since 1983 using an Aerochem Metrics wetfall/dryfall collector located at the Jornada LTER weather station.

Wetfall occurring as precipitation is collected after each event with a sample size large enough to analyze. Dryfall is collected monthly. Each sample is analyzed for NO3, NH4, Cl, SO4, Ca, Mg,Na, K, Total N, & Total P. Inclusion of... more

  • Dataset: Dryfall deposition chemistry data
  • Dataset: Wetfall deposition chemistry data

Project ID: PRL2012002
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: Ecotone rodent metrics (abundance, biomass, energy, species richness)
  • Dataset: Ecotone annual net primary productivity by plant form
  • Dataset: Ecotone rodent trapping

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 domestic... more

  • Dataset: East and west boundary fence plant line intercepts - percent cover for 9 species, Jornada Basin, 1982 to 1992
  • Dataset: East and west boundary fence plant line intercepts - percent cover for all species beginning 1986

Project ID: 210121000
Abstract: Our understanding of ecological function in desert systems suggests that the physiological and morphological differences among species act as strong influences on resource capture and ecosystem modification; hence alteration of the composition or the relative abundances of species should alter availability and cycling of energy, water, and other resources. We initiated a long-term experiment in which the diversity of plant "... more
  • Dataset: Biodiversity tipping bucket rain gauge data - Daily Summary
  • Dataset: Biodiversity tipping bucket rain gauge data - By Event

Project ID: 210425000
Abstract:

The principal purpose is to provide daily precipitation at specific sites to assist the study of vegetation response over time. 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... more

  • Dataset: Estimated daily precipitation at the 15 ANPP sites: 1980-2010

Project ID: 210127000
Abstract:

Surface evaporation is measured weekly to twice weekly using an evaporation pan compatible with standard National Weather Service evaporation measurements. Measurements are made twice per week during hot periods because of high evaporation rate. The following data is collected: number of days between measurements, beginning and ending measurement period, current, minimum, and maximum water temperature; initial water level; final water level; rainfall since last... more

  • Dataset: Evaporation pan data beginning 1983 - Jornada LTER Weather Station

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: Plant cover in precipitation and nitrogen treatment plots (by species)
  • Dataset: Soil water content in precipitation and nitrogen treatment plots at 2 depth profiles

Project ID: 210409000
Abstract:

The project explores the influence of precipitation change on black grama and mesquite ecophysiology. Precipitation is manipulated relative to ambient precipitation with Sala et al's rainout shelters and sprinklers in Pasture 13. Ecophysiological measurements (pre-dawn water potential and photosynthesis) are measured throughout the growing season.

  • Dataset: Photosynthetic rates for leaves from 5 precipitation treatments
  • Dataset: Pre-dawn water potential for leaves from 5 precipitation treatments

Project ID: 210288000
Abstract: Collections of airborne sand are obtained at 16 locations at the Jornada LTER area, the 15 NPP sites and the Geomet site. The collections are taken using BSNE collectors. The collectors are turned into the wind with wind vanes. The amount of material collected corresponds to the horizontalflux at the height of the collector and the opening area of the collector and the duration of the sampling time. The five heights of the BSNE collectors are 5, 10,... more
  • Dataset: Horizontal sand mass flux data Derived from 5-stage BSNE collectors at 15 NPP sites and Geomet site

Project ID: 210001000
Abstract: Looking at infiltration and runoff rates as related to rain event duration and intensity as well as soil and organic movement as related below in creosotebush and grassland areas. Nine hydrology runoff plots were begun in 1983 during LTER-I and located in creosotebush zone. An additional 12 runoff plots have been added. These additions consist of 4 each at C-CALI, G-SUMM, and G-IBPE. G-SUMM and G-IBPE are blackgrama grassland sites. Refer... more
  • Dataset: Hydrology natural runoff plots - runoff
  • Dataset: Hydrology plot surface runoff water chemistry
  • Dataset: Hydrology natural runoff plots plant cover

Project ID: 210380000
Abstract: The objective of this long-term project is to measure the precipitation across the entire Jornada Experimental Range. This is achieved by using a network of standard-can rain gages to continually collect the precipitation as it occurs. The collected precipitation is then measured monthly and the results are recorded on a data sheet which is later entered into a spreadsheet.
  • Dataset: JER standard gauge monthly precipitation data

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. ... more
    • Dataset: Jornada Experimental Range permanent quadrat chart data beginning 1915 - plant density

Project ID: 210412000
Abstract:

Stocking rates for cattle, horses, and sheep are provided for the Jornada Experimental Range beginning in 1916. Goats were few and are included as part of the sheep category and not differentiated.

  • Dataset: Jornada Experimental Range stocking rates for cattle, horses, and sheep beginning 1916

Project ID: 210126000
Abstract:

Jornada LTER climatalogical station on the Jornada basin. Weather station location:

            deg   min  sec           UTM: 331192.4E 3599474N WGS84, Zone 13

LAT        32     31   17

LONG   106     47   50

Hourly and Daily Summary climate data... more

  • Dataset: LTER Weather Station hourly summary climate data
  • Dataset: LTER Weather Station daily summary climate data
  • Dataset: Dipstick rain gauge data - LTER Weather Station

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