Filters: Tags: nitrate (X)
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Categories: Publication;
Types: Citation;
Tags: Agricultural Chemicals,
Agricultural runoff,
Agrochemicals,
China,
China, People's Rep.,
Categories: Publication;
Types: Citation;
Tags: Algae,
Bacteria,
Chlorine compounds,
Cultures,
Disinfectants,
Categories: Publication;
Types: Citation;
Tags: Anaerobic conditions,
Biodegradation,
Environmental conditions,
Hydrocarbons,
Iron,
Categories: Publication;
Types: Citation;
Tags: Atmospheric Chemistry,
Biogeochemistry,
Catchment areas,
Deposition,
Flow,
Categories: Publication;
Types: Citation;
Tags: Ammonium,
Artemisia californica,
Bromus madritensis rubens,
Decline,
Grasses,
Categories: Publication;
Types: Citation;
Tags: ASW, USA, Florida, Florida Keys, Key Colony Beach,
Canals,
Coastal waters,
Denitrification,
Environmental monitoring,
Categories: Publication;
Types: Citation;
Tags: Aquatic bacteria,
Community composition,
Environmental factors,
Heterotrophic bacteria,
J 02905 Water; P 2000 FRESHWATER POLLUTION,
This data set includes WRTDS nutrient flux trend results and the values of daily streamflow trend results displayed in the Quantile-Kendall plots. For 1995-2015 nutrient trends, the method of generalized flow normalization (FNG) was used which explicitly addresses non-stationary streamflow conditions. For 2005-2015 nutrient trends, the WRTDS trend analyses used the method of stationary flow normalization (FNS) because streamflow nonstationarity is difficult to assess over this shorter duration time frame. The 1995-2015 annual nutrient trends were determined for all five nutrient parameters (TP, SRP, TN, NO23, TKN), and monthly trends were evaluated only for SRP. The 2005-2015 annual nutrient trends were determined...
As an estimate of species-level differences in the capacity to take up different forms of N, we measured plant uptake of 15N-NH4+, 15N-NO3- and 15N, [1]-13C glycine within a set of herbaceous species collected from three alpine community types. Plants grown from cuttings in the greenhouse showed similar growth responses to the three forms of N but varied in the capacity to take up NH4+, NO3- and glycine. Glycine uptake ranged from approximately 42% to greater than 100% of NH4+ uptake; however, four out of nine species showed significantly greater uptake of either NH4+ or NO3- than of glycine. Relative concentrations of exchangeable N at the sites of plant collection did not correspond with patterns of N uptake among...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Plant and Soil,
Springer Netherlands,
ammonium,
glycine,
nitrate
Categories: Publication;
Types: Citation;
Tags: Agriculture,
Corn,
Crop Yield,
Crops,
Fertilization,
Categories: Publication;
Types: Citation;
Tags: ASW, Brazil, Sao Paulo, Baixada Santista Estuary,
Bacteria,
Beaches,
Brackishwater pollution,
Brazil,
Categories: Publication;
Types: Citation;
Tags: Algae,
Algae,
Aquatic Environment,
Biochemistry,
Chlorine compounds,
Categories: Publication;
Types: Citation;
Tags: ASFA 3: Aquatic Pollution & Environmental Quality; Water Res,
Agricultural runoff,
Agriculture,
Atrazine,
Environmental protection,
Summary A detailed local-scale monitoring network was used to assess CFC distribution in an unconfined sand aquifer in southwestern Ontario where the zone of 1–5-year-old groundwater was known with certainty because of prior use of a bromide tracer. Groundwater ⩽5 years old was confined to an aerobic zone at ⩽5 m depth and had CFC concentrations consistent with modern atmospheric mixing ratios at recharge temperatures of 7–11 °C, as was observed in the 3-m thick vadose zone at the site. At depths below 6 m, the groundwater became progressively more reducing, however, with a denitrifying horizon at 6–7 m depth, and a Mn and Fe reducing zone below 7 m depth. In the anaerobic zone, 3H/3He ratios indicated that groundwater-age...
Using a model as a management tool requires testing of the model against field-measured data prior to its application for solving natural resource problems. This study was conducted to test the Root Zone Water Quality Model (RZWQM98) using four years (1996 to 1999) of field-measured data to simulate the effects of different N-application rates on corn yields and nitrate-nitrogen (NO[3]-N) losses via subsurface drain water. Three N-application rates (low, medium, and high), each replicated three times, were applied to corn in 1996 and 1998 under a randomized complete block design at a tile-drained corn-soybean rotation field near Story City, Iowa. No N-fertilizer was applied to soybean in 1997 and 1999. Model calibration...
Categories: Publication;
Types: Citation;
Tags: Data Visualization & Tools,
Dose activity relation,
Drainage water,
Eau drainage,
Fertilisation Soil pollution,
The datasets provided here are the input data used to run the Seasonal Kendall Trend (SKT) tests and Weighted Regressions on Time, Discharge, and Season (WRTDS) models. SKT tests use "annualSamplingFreqs_allSites.csv" and "wqData_screenedSitesAll.csv" which includes, for all site-parameter combinations, information on annual sampling frequencies and the screened water-quality data, respectively. The WRTDS models use "DRB.wqdata.20200521.csv", "DRB.flow.20200610.zip", and "DRB.info.20200521.csv" for calibration which includes, for all site-parameter combinations, the water-quality data, streamflow data (as separate .csv files for each site), model specifications and site information, respectively. The multisource...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Ammonia,
Calcium,
Chloride,
Delaware,
Delaware River,
Two native desert shrubs were evaluated for their growth potential and water and nitrogen uptake patterns over a nitrate-contaminated aquifer at a former uranium ore-processing facility in northeastern Arizona. Sarcobatus vermiculatus and Atriplex canescens are obligate and facultative phreatophytes, respectively, that dominate the local desert plant community. The main questions we addressed were: (1) Are these shrubs able to use water or nitrogen from the alluvial aquifer? (2) If so, does grazing interfere with that ability of shrubs? (3) What would be the ideal strategy to take up N from the plume and prevent its expansion and recharge using shrubs? ?18O and ?D isotope signatures from water in plant stem samples...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Atriplex canescens,
Desert ecology,
Journal of Arid Environments,
Nitrate,
Phytoremediation,
Recent evidence associates the persistence of invasive plant species with disturbance and fluctuations in distinct forms of mineral N in soils. We conducted soil and hydroponic experiments to investigate the influence of N form and availability on germination and seedling development of 2 invasive annual grasses, cheatgrass (Bromus tectorum) and medusahead (Taeniatherum caput-medusae) and 6 perennial grasses, bluebunch wheatgrass (Pseudoroegneria spicata), crested wheatgrass (Agropyron cristatum x A. desertorum), Sand Hollow and Seaman?s Gulch big squirreltail (Elymus multisetus), and Little Camas and Little Wood bottlebrush squirreltail (E. elymoides ssp. brevifolius and E. elymoides ssp. elymoides, respectively)....
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Allen Press and Society for Range Management,
Journal of Range Management,
ammonium,
invasive annual grass,
nitrate,
Categories: Publication;
Types: Citation;
Tags: Agricultural Watersheds,
Agriculture,
British Isles, England,
British Isles, England,
Catchment areas,
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