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Title: Land Cover as a Framework For Assessing the Risk of Water Pollution
Author(s): Wickham, James D.; Riitters, Kurt H.; O'Neill, Robert V.; Reckhow, Kenneth H.; Wade, Timothy G.; Jones, K. Bruce
Date: 2000
Source: Journal of the American Water Resources Association 36(6): 39-46
Description: 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 non-forest 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 watershed. 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.
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