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@MISC{University_,
author = {Logical Engineering University and Karen A. Poianil and Barbara L. Bedford and Michael D. Merrid},
title = {},
year = {}
}
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Abstract
We developed a spatially-explicit,quantitative Nitrogen Leaching Index to assess the potential for non-point source subsurface nitrogen pollution to wetlands. The index was based on the leaching potential of the water- shed soils, the amount of nitrogen available for leaching, and the spatial position of nitrogen sources in the watershed. A raster or cell-based geographic information system was used to estimate the necessary data inputs for calculating the index, such as soil hydrologic group, land type combination, ground- water residence time, and location of septic systems. The Total and Average Watershed Nitrogen Leaching Index (TWNLI and AWNLI) were calculated by summing and averaging, respectively, individual cell contri- butions over a watershed. Analysis of nine wetland watersheds in central New York state, USA, with mixed forest and agricultural land uses illustrated the use of the index for identifying and wetlands with potential nitrogen pollu- tion. Results showed that the spatial characteristics of a watershed potentially can effect subsurface nitrogen delivery to groundwater-dominated wetlands. The use of an index based on watershed soils, topography, and land use may be useful for assessingpotential nitrogen pollution to wetlands at a regional scale. 1.
Keyphrases
type combination soil hydrologic group mixed forest average watershed nitrogen leaching index necessary data input groundwater-dominated wetland land use individual cell contri butions central new york state nitrogen delivery non-point source subsurface nitrogen pollution agricultural land us nitrogen source spatial position quantitative nitrogen leaching index spatial characteristic potential nitrogen pollu tion cell-based geographic information system septic system assessingpotential nitrogen pollution ground water residence time watershed soil regional scale wetland watershed
