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

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  • Diana Mitsova
  • Xinhao Wang
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    Abstract

    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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    File URL: http://www.tandfonline.com/doi/abs/10.1080/09640568.2010.490052
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    Bibliographic Info

    Article provided by Taylor & Francis Journals in its journal Journal of Environmental Planning and Management.

    Volume (Year): 53 (2010)
    Issue (Month): 7 ()
    Pages: 863-882

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    Handle: RePEc:taf:jenpmg:v:53:y:2010:i:7:p:863-882

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    Related research

    Keywords: Nitrate Leaching Index; non-linear regression; Weibull distribution; N decay coefficients; Kruskal-Wallis nonparametric test;

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