LAND COVER AS A FRAMEWORK FOR ASSESSING RISK OF WATER POLLUTION 1

ABSTRACT: A survey of numerous field studies shows that nitrogen and phosphorous export coefficients are significantly different across forest, agriculture, and urban land‐cover types. We used simulations to estimate the land‐cover composition at which there was a significant risk of nutrient loads representative of watersheds without forest cover. The results suggest that at between 20 percent and 30 percent nonforest cover, there is a 10 percent or greater chance of N or P nutrient loads being equivalent to the median values of predominantly agricultural or urban watersheds. The methods apply to environmental management for assessing the risk to increased nonpoint nutrient pollution. Interpretation of the risk measures are discussed relative to their application for a single watershed and across a region comprised of several watersheds.

[1]  D. Correll.  THE ROLE OF PHOSPHORUS IN THE EUTROPHICATION OF RECEIVING WATERS: A REVIEW , 1998 .

[2]  C. Arnold,et al.  IMPERVIOUS SURFACE COVERAGE: THE EMERGENCE OF A KEY ENVIRONMENTAL INDICATOR , 1996 .

[3]  R. Parry,et al.  Agricultural phosphorus and water quality: a U.S. Environmental Protection Agency perspective , 1998 .

[4]  Keith Richards,et al.  Estimation of Surface Water Quality Changes in Response to Land Use Change: Application of The Export Coefficient Model Using Remote Sensing and Geographical Information System , 1996 .

[5]  Marty D. Matlock,et al.  A Watershed-Level Ecological Risk Assessment Methodology , 1996 .

[6]  Keith J. Lucey,et al.  Effects of Climatic Variations over 11 Years on Nitrate‐Nitrogen Concentrations in the Raccoon River, Iowa , 1993 .

[7]  R. O'Neill,et al.  Ecological Risk Assessment at The Regional Scale: Ecological Archives A005-001. , 1991, Ecological applications : a publication of the Ecological Society of America.

[8]  Richard C. Lathrop,et al.  Phosphorus Loads to Surface Waters: A Simple Model to Account for Spatial Pattern of Land Use , 1996 .

[9]  Donald E. Weller,et al.  Effects of agriculture on discharges of nutrients from Coastal Plain watersheds of Chesapeake Bay , 1997 .

[10]  Yves T. Prairie,et al.  EFFECT OF CATCHMENT SIZE ON PHOSPHORUS EXPORT , 1986 .

[11]  W. Battaglin,et al.  Logistic model of nitrate in streams of the upper-Midwestern United States , 1997 .

[12]  Terry L. Sohl,et al.  Regional characterization of land cover using multiple sources of data , 1998 .

[13]  P. Dillon,et al.  The effects of geology and land use on the export of phosphorus from watersheds , 1975 .

[14]  Martinus J. Bergman,et al.  Estimating Nonpoint Source Pollution Loads With a GIS Screening Model , 1995 .

[15]  Walter Rast,et al.  Nutrient Loading Estimates for Lakes , 1983 .

[16]  James D. Wickham,et al.  An ecological assessment of the United States mid-Atlantic region , 1997 .

[17]  W. J. Young,et al.  Nutrient Exports and Land Use in Australian Catchments , 1996 .

[18]  C. Frink,et al.  Estimating nutrient exports to estuaries , 1991 .

[19]  Kenneth H. Reckhow,et al.  An Examination of Land Use - Nutrient Export Relationships , 1982 .

[20]  J. Vogelmann,et al.  Regional Land Cover Characterization Using Landsat Thematic Mapper Data and Ancillary Data Sources , 1998 .

[21]  Quay Dortch,et al.  Nutrient changes in the Mississippi River and system responses on the adjacent continental shelf , 1996 .