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The importance of soil water in the recruitment of Bouteloua gracilis in the shortgrass steppe In the shortgrass steppe region of North America there is a controversy about the ability of the dominant species to recruit from seedlings. The prevailing view is that Bouteloua gracilis is incapable of recruitment from seedlings in areas receiving <380 mm of annual precipitation. A common explanation for this situation is that environmental conditions permitting seedling establishment are infrequent. To assess the frequency of environmental conditions appropriate for the recruitment of B. gracilis we used a soil water simulation model and long-term climatic data in conjunction with detailed information about the ecophysiological requirements for seed germination and growth of seminal and adventitious roots. We... Categories: Publication; Types: Citation, Journal Citation; Tags: Bouteloua gracilis, Ecological Applications, disturbance, germination, recruitment, All tags... shortgrass steppe, simulation, soil texture effect, soil water, spatial variability, temporal variability, Fewer tags Publication and Report: Ecosystem Water Balance in a Desert Grassland ​Abstract: Climate change predictions include warming and drying trends, which are expected to be particularly pronounced in the southwestern United States. In this region, grassland dynamics are tightly linked to available moisture, yet it has proven difficult to resolve what aspects of climate drive vegetation change. In part, this is because it is unclear how heterogeneity in soils affects plant responses to climate. Here, we combine climate and soil properties with a mechanistic soil water model to explain temporal fluctuations in perennial grass cover, quantify where and the degree to which incorporating soil water dynamics enhances our ability to understand temporal patterns, and explore the potential consequences... Categories: Data, Publication; Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 2012, AZ-02, AZ-03, AZ-04, Academics & scientific researchers, All tags... Applications and Tools, Arizona, Big Bend ‐ Río Bravo & Lower Río Conchos Pilot Area, CA-08, CO-03, California, Chihuahua, Chihuahuan Desert, Colorado Plateau, Conservation NGOs, Data.gov Desert LCC, Datasets/Database, Decision Support, EARTH SCIENCE > BIOSPHERE > VEGETATION, Federal resource managers, LCC Network Science Catalog, Mexico, Mojave Desert, Mojave Desert Pilot Area, NM-02, NV-03, NV-04, New Mexico, Population & Habitat Evaluation/Projection, Publication, Report, Sonora, Sonoran Desert, TX-16, TX-23, Transboundary Madrean Watersheds Pilot Area, UT-02, UT-03, United States, User Manual, Utah, Vulnerability Assessment, biota, climate change, completed, desert southwest, ecohydrology, plants, product, soil water, vegetation change, water availability, Fewer tags The Influence of Pedology and Changes in Soil Moisture Status on Manganese Release from Upland Catchments: Soil Core Laboratory Experiments Manganese (Mn) contamination of drinking water may cause aesthetic and human health problems when concentrations exceed 50 and 500 ?g l?1, respectively. In the UK, the majority of Mn-related drinking water supply failures originate from unpolluted upland catchments. The source of Mn is therefore soil, but the exact mechanisms by which it is mobilised into surface waters remain unknown. Elevated Mn concentrations in surface waters have been associated with the rewetting of dried upland soils and with conifer afforestation. We investigated these hypotheses in a laboratory experiment involving the drying and rewetting of intact soil cores (1,900 cm3 volume) of horizons of four representative soil type-land use combinations... Categories: Publication; Types: Citation, Journal Citation; Tags: Drinking water, Intact soil cores, Land use, Manganese, Mobilisation, All tags... Soil horizon, Soil water, Upland catchments, Water, Air, & Soil Pollution, Fewer tags Restoring riparian meadows currently dominated by Artemisia using alternative state concepts - the establishment component We evaluated the potential for restoring riparian grass and sedge meadows currently dominated by Artemisia tridentata var. tridentata with an experiment in which we burned sites with low, intermediate, and high water tables, i.e., dry, intermediate, and wet sites. To define the alternative states and thresholds for these ecosystems, we examined burning and water table effects on both abiotic variables and establishment of grasses adapted to relatively high (Poa se-cunda ssp. juncifolia), intermediate (Leymus triticoides), or low (L. cinereus) water tables. Wet sites had lower soil temperatures and higher soil water contents than dry sites. Burning increased soil temperatures on all sites. Undershrub microsites on... Categories: Publication; Types: Citation, Journal Citation; Tags: Applied Vegetation Science, Great Basin, dry meadow, restoration, seedling emergence, All tags... seedling survival, soil temperature, soil water, thresholds, Fewer tags Water Relations and Water use Patterns for Artemisia Tridentata Nutt. In Wet and Dry Years Plant H"2O relations and soil moisture depletion and recharge were followed in a stand of Artemisia tridentata near Washtucna, Washington during 1973 and 1974. Precipitation during the 1972-73 recharge season was 14.5 cm, 11 cm below normal. The 1973-74 precipitation was 35.7 cm, or 10 cm above normal. The 2 yr were therefore ideal for comparing plant behavior on wet vs. dry years. Soil moisture was depleted to around -70 bars in 1973 and -60 bars in 1974 to depths of 2.5 m. Leaf H"2O potentials were -10 bars in the spring and decreased to -50 to -60 bars in the summer of 1973. In 1974, summer leaf H"2O potential was -30 bars. Osmotic potentials were around -20 bars in the spring of 1973 and throughout the spring... Categories: Publication; Types: Citation, Journal Citation; Tags: Artemisia tridentata, Ecology, Washington, diffusion resistance, evapotranspiration, All tags... neutron meter, osmotic potential, pressure bomb, soil evaporation, soil water, thermocouple psychrometer, water potential, Fewer tags