三峡库区梁滩河流域水质污染状况研究

Investigation on Water Pollution of Liangtan River Watershed in the Three Gorges Reservoir Area

研究三峡库区梁滩河流域上、中游区域外源和内源对河水水质的污染。结果表明,研究区内N,P元素污染最为严重,其次为有机质污染,重金属污染较轻。外源对河水水质的污染程度大于内源。在外源污染中,研究区干流水质污染较支流严重。干流的污染源主要位于距河流源头约10～35km的区段,而支流的污染源则主要位于距支流源头约18km之后的区段。

This paper studies the current state of water pollution in the Liangtan River watershed which located in the Three Gorges Reservoir area, particularly effects on upper and middle reach from external sources, and effects on lower reach from internal sources. Investigation results reveal , N and P are the primary pollutants, followed by organic materials, while heavy metals have a minor influence as well . In addition, the impacts contributed from the external sources appear to be larger than thoes from internal sources. In terms of external sources impacts on Liang- tan River , the main stream is subjected to be heavier pollution than branches in the studied watershed . Further more, the results indicate major emission sources for the main stream are scattered in the reach of 10-35 km away from head water, while major emission sources for the tributary are scattered in the reach of 18 km after from the head water.