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23 results for “black grama”
Walnut Gulch Experimental Watershed site, station Shrubs and sparse grass vegetation zone in Walnut Gulch Watershed, study of plant cover of Bouteloua eriopoda (black grama) in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Walnut Gulch Experimental Watershed (WGE) contains plant cover of Bouteloua eriopoda (black grama) measurements in percent units and were aggregated to a yearly timescale.
Lehmann lovegrass and black grama drought response in the Jornada Desert 2021
<p>Percent cover for <em>Bouteloua eriopoda </em>and <em>Eragrostis lehmanniana </em>was collected over four years at Mt. Summerford (latitude 32.516, longitude -106.802), New Mexico State University's Chihuahuan Desert Rangeland Research Center (CDRRC), Doña Ana County, New Mexico. In June 2016, permanent 2m × 2m plots were installed to evaluate change in percent cover of <em>B. eriopoda</em> and <em>E. lehmanniana</em> in response to precipitation manipulation treatments of +80% (irrigated), -80% (drought), and ambient (control) precipitation. We used a randomized complete block design with six replicates per treatment, with blocks perpendicular to the slope, for a total of 18 plots. Plot locations were adjusted to exclude ant nests, and plant species other than annuals. Cover of other plant species was <1% at the beginning of the study. This cover included <em>Aristida turnipes</em> (0.13%), <em>Panicum hallii</em> (0.20%), and <em>Sporobolus</em> spp. (0.15%). At the upslope border of each plot, we installed galvanized flashing to a depth of approximately 11.4 cm to block surface flow of water onto plots. Metal rebar stakes were driven into the ground at each corner of each plot as permanent markers. A large nail embedded in the center of each plot was used to standardize placement of data collection frames. Rainout shelters, constructed according to the design by Yahdjian and Sala (2002), extended 0.5 m beyond the boundaries of the plots. Rainout shelters manipulated precipitation received, so 151 that irrigated plots received 180% ambient precipitation, drought plots received 20% of ambient precipitation, and control plots received 100% ambient precipitation. Due to repeated malfunctions including pipe leaks and electronic component failures, the maintenance of the irrigation systems became untenable after 2017. Therefore, irrigation plots were excluded and only control and drought data were included in 2018 and 2019 analyses.</p>
Lehmann lovegrass and black grama drought response in the Jornada Desert 2021
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