Influence of landscape characteristics on non-point source pollutant output in Taihu upper-river basin

Based on the observed data in monitored drainage areas and GIS spatial analysis tools, watershed basic database of Taihu upper-river basin was built. Using the methods of multiple stepwise regression and redundancy analysis, the influence of landscape characteristics on non-point source pollutant ou...

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Bibliographic Details
Published inHuanjing kexue Vol. 29; no. 5; p. 1319
Main Authors Li, Yan, Li, Heng-Peng
Format Journal Article
LanguageChinese
Published China 01.05.2008
Subjects
China
Environmental Monitoring
Fresh Water - analysis
Regression Analysis
Soil Pollutants - analysis
Water Pollutants, Chemical - analysis
China
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Summary:Based on the observed data in monitored drainage areas and GIS spatial analysis tools, watershed basic database of Taihu upper-river basin was built. Using the methods of multiple stepwise regression and redundancy analysis, the influence of landscape characteristics on non-point source pollutant output at the outlets of watersheds and their relative influence intensity were analyzed. The dominant landscape characteristics influencing non-point source pollutant output in Taihu upper-river basin and sub-watersheds were also illustrated. The results show that there are strong correlations between non-point source pollution and landscape characteristics, in which land use makes the most remarkable effect, followed by soil characteristics and average slope and watershed area in turn. Residential land proportion, farmland proportion and average terrain slope with higher importance and significance level, are the dominant landscape characteristics variables affecting non-point source pollutant output of watersheds.
ISSN:0250-3301