Seasonal and Spatial Phosphorus Trends in the Minnesota River Basin
Author : Kara Lynn Greenley Marr
Publisher :
Page : 240 pages
File Size : 32,25 MB
Release : 1999
Category : Ecosystem management
ISBN :
Author : Kara Lynn Greenley Marr
Publisher :
Page : 240 pages
File Size : 32,25 MB
Release : 1999
Category : Ecosystem management
ISBN :
Author :
Publisher :
Page : 12 pages
File Size : 50,89 MB
Release : 1998
Category : Minnesota River (S.D. and Minn.)
ISBN :
Author : Feng Fang
Publisher :
Page : 350 pages
File Size : 48,63 MB
Release : 2002
Category :
ISBN :
Author : Elaine C. Todd Trench
Publisher : DIANE Publishing
Page : 28 pages
File Size : 47,49 MB
Release : 2004
Category : Government publications
ISBN :
Author : Sharon Elizabeth Kroening
Publisher :
Page : 440 pages
File Size : 25,29 MB
Release : 1994
Category : Water
ISBN :
Author : Linda M. Jacobson
Publisher :
Page : pages
File Size : 37,47 MB
Release : 2010
Category :
ISBN :
Phosphorus (P) in rivers and streams in the Mississippi River Basin (MRB) is a contributing nutrient to hypoxia in the Gulf of Mexico and impacts local water quality. Although nitrogen has been extensively studied and attributed to be the main nutrient causing the Gulf hypoxic zone, P has increasingly been recognized as having more of an effect than was previously thought. The primary inputs of P to rivers and streams are through surface runoff or tile drainage from agricultural fields and from point sources, primarily sewage effluent. The objective of this study was to analyze the spatial pattern of P inputs and outputs in the MRB as they relate to riverine P yields to the Gulf of Mexico and to determine the counties in the MRB that have the highest yields of P and the most critical factors causing this P loss. A database of factors contributing P to the environment was constructed for each county in the MRB from 1997 through 2006 including data on fertilizer application, major crop acreage and harvest, animal numbers for manure inputs and human population. Landscape and climate characteristics of tile drainage, soil characteristics, slope and precipitation were also included. Riverine yields of total P (TP), dissolved reactive P (DRP) and particulate P (PP) for 113 watersheds within the MRB were related to these factors to create multiple regression and spatial error regression models to predict P yields throughout the basin. The fraction of the land planted in crops, sewage effluent P inputs and precipitation were found to best predict TP yields with a spatial error model (R2=0.47). Dissolved reactive P yields were predicted by fertilizer P inputs, sewage effluent P inputs and precipitation in a multiple regression model (R2=0.46), whereas PP yields were explained by crop fraction, sewage effluent P inputs and soil bulk density in a spatial error regression model (R2=0.499). Inputs of P from animal manure were not found to be significant in any model predicting P yields, which contrasts with the results of the USGS SPARROW model. Overall, the Cornbelt region of the upper Midwest, where there is a large amount of cropland and fertilizer application, had the counties with the greatest P yields. This analysis of P in the MRB helps to point out specific areas where P reductions are needed to limit the occurrence of Gulf hypoxia and improve local water quality.
Author : Laura Mary Joy McCann
Publisher :
Page : 36 pages
File Size : 14,81 MB
Release : 1998
Category : Agricultural pollution
ISBN :
Author : Laura Mary Joy McCann
Publisher :
Page : 428 pages
File Size : 27,4 MB
Release : 1997
Category :
ISBN :
Author : British Standards Institute Staff
Publisher :
Page : 32 pages
File Size : 28,79 MB
Release : 2004-06-14
Category :
ISBN : 9780580439339
Water, Quality, Water testing, Water resources, Seawater, Effluents (sewage), Industrial water pollutants, Chemical analysis and testing, Determination of content, Phosphorus, Phosphates, Orthophosphates, Polyphosphates, Spectrophotometry, Solvent extraction methods
Author : Vladimir Novotny
Publisher : IWA Publishing (International Water Assoc)
Page : 414 pages
File Size : 27,29 MB
Release : 1999-05-31
Category : Medical
ISBN :
Diffuse Pollution of surface, coastal and ground waters is a major environmental and economic problem in the world today. Unlike point source pollution, which has to some extent been controlled by developments in technology and regulation, diffuse pollution is difficult to control, requiring the application of technological and socio-economical approaches and of education. The 46 papers in these proceedings have been selected from those presented at the 3rd International Conference on Diffuse Pollution, which addressed urban and rural diffuse pollution problems and solutions as experienced in several countries. The papers are divided into five themes: Identification of sources and loads Best Management Practices Receiving water impacts Modelling diffuse pollution Watershed management. The proceedings conclude with two papers, prepared by prominent specialists, that summarise the key findings at the conference. These proceedings will prove an essential resource for all concerned, whether as researchers, regulators or practioners, with diffuse pollution and its control.