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Filters Date Range Past year (1) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Citation (3) ArcGIS Service Definition (1) Types Journal Citation (3) ArcGIS REST Map Service (1) ArcGIS Service Definition (1) Downloadable (1) GeoTIFF (1) Map Service (1) Contacts Michael E Wieczorek Maryland-Delaware-D.C. Water Science Center John R. Olson U.S. Geological Survey Shannon E Jackson More... Categories Publication (3) Data (1) Map (1) Tag Types Theme (2) Place (2) Tag Schemes None (2) View Results as: JSON ATOM CSV

Performance of Bromus tectorum L. in relation to soil properties, water additions, and chemical amendments in calcareous soils of southeastern Utah, USA In drylands of southeastern Utah, USA, the invasive exotic grass Bromus tectorum L. occurs in distinct spatial patterns suggesting soil control of ecosystem susceptibility to invasion. To improve our understanding of these patterns, we examined performance of B. tectorum in relation to additions of water, KCl, MgO, and CaO at seventeen 1600 m2 sites distributed across a calcareous soil gradient in Canyonlands National Park. Water additions resulted in a 57% increase in B. tectorum establishment. Fall establishment was significantly correlated with silt and clay content in wet plots but not in dry plots, suggesting that texture effects on B. tectorum establishment patterns may be greater in wet years than in dry... Categories: Publication; Types: Citation, Journal Citation; Tags: Plant and Soil, invasive species, magnesium, manganese, phosphorus, All tags... potassium, spatial pattern, Fewer tags Attributes for NHDPlus Version 2.1 Catchments and Modified Routing of Upstream Watersheds for the Conterminous United States: National Atmospheric Deposition Program (NADP) National Trends Network (NTN) 1985-2014 This data set represents National Atmospheric Deposition Program (NADP) National Trends Network average of annual precipitation-weighted mean atmospheric deposition for seven select constituents from years 1985-2014 compiled for two spatial components of the NHDPlus version 2 data suite (NHDPlusv2) for the conterminous United States; 1) individual reach catchments and 2) reach catchments accumulated upstream through the river network. The seven constiuents presented here are: Calcium, Nitrate, Sulfate, Inorganic Nitrogen, Magnesium, Ammonium, and Chloride. Units are kilograms per hectare. This dataset can be linked to the NHDPlus version 2 data suite by the unique identifier COMID. The source data was produced by... Types: Citation; Tags: Ammonium, Calcium, Catchment, Chloride, Conterminous United States, All tags... Inlandwaters, Inorganic nitrogen, Magnesium, NAWQA, NHDPlus, National Atmospheric Deposition Program, Nitrate, SPARROW, Sulfate, atmospheric wet deposition, Fewer tags Geochemical Characteristics of the Conterminous United States: % MgO This raster depicts the percentage of lithological magnesium oxide (MgO) content in surface or near surface geology. We derived these rasters by calculating the average percent MgO content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, Magnesium, All tags... MgO, Fewer tags High nitrogen availability does not improve salinity tolerance in Sarcobatus vermiculatus Natural and anthropogenic changes in basin lake levels in the western U.S. expose saline, alkaline substrates that are commonly colonized by shrubs in the Chenopodiaceae. On a chronosequence of recently exposed substrates at Mono Lake, California, Sarcobatus vermiculatus has greatest biomass accrual, seed production, seedling establishment, and leaf N at younger sites where soils are extremely saline and alkaline. These field observations and an understanding of the role of N-containing compatible solutes in salinity tolerance of halophytes led to our prediction that Na and N interactions stimulate Sarcobatus performance. To test this, we grew Sarcobatus juveniles for 2 years in the greenhouse at 4 levels of NaCl... Categories: Publication; Types: Citation, Journal Citation; Tags: Sarcobatus vermiculatus, Western North American Naturalist, black greasewood, calcium, cation, All tags... halophyte, magnesium, nitrogen, salinity, selectivity, sodium, Fewer tags Performance of Bromus tectorum L. in relation to soil properties, water additions, and chemical amendments in calcareous soils of southeastern Utah, USA In drylands of southeastern Utah, USA, the invasive exotic grass Bromus tectorum L. occurs in distinct spatial patterns suggesting soil control of ecosystem susceptibility to invasion. To improve our understanding of these patterns, we examined performance of B. tectorum in relation to additions of water, KCl, MgO, and CaO at seventeen 1600 m2 sites distributed across a calcareous soil gradient in Canyonlands National Park. Water additions resulted in a 57% increase in B. tectorum establishment. Fall establishment was significantly correlated with silt and clay content in wet plots but not in dry plots, suggesting that texture effects on B. tectorum establishment patterns may be greater in wet years than in dry... Categories: Publication; Types: Citation, Journal Citation; Tags: Plant and Soil, invasive species, magnesium, manganese, phosphorus, All tags... potassium, spatial pattern, Fewer tags