Journal Articles

A GIS-based technique for linking landscape characteristics to non-point source nitrogen export potential: implications for contributing areas management

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A Nitrate-N Leaching Index (NLI) is calculated and the results indicate that nitrogen loss in the study area occurs through both leaching and surface runoff. A non-linear regression model of trapping efficiency was combined with a first order decay model to examine the impact of soil characteristics, slope, vegetative cover, land use and distance to streams on the spatial pattern of non-point source nitrogen inputs to streams. The model evaluates the statistical significance of each landscape factor and provides an easy interpretation of the landscape delivery ratio of nitrogen based on a pixel-based characterisation of the watershed. The model was validated by comparing the distributions of the observed and estimated monthly nitrogen concentrations. The exploratory GIS-based method presented here can improve the understanding of the impact of landscape characteristics on nitrate-nitrogen contributing areas and therefore assist watershed management efforts.

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Detail Information

Series Title

Journal of Environmental Planning and Management

Call Number

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Publisher

United Kingdom : Routledge Taylor & Francis Group., 2010

Collation

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Language

English

ISBN/ISSN

09640568

Classification

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Content Type

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Media Type

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Carrier Type

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Edition

Volume 53, Issue 7 October 2010 , pages 863 - 882

Subject(s)

Nitrate Leaching Index
Non-linear regression
Weibull distribution
Kruskal-Wallis nonparametric test

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