With rapid socio鄄economic development in the Taihu Lake Basin, pollution of Taihu Lake water is increasingly getting more serious. Thus government at all levels has allocated considerable resources (money and manpower) to this issue in the Taihu Lake Basin. As a result of their efforts, point source pollution has been better controlled around the basin. But non鄄point source pollution is still serious due to its dispersion and concealment, and its random nature, and consequent difficult monitoring. So it is still the key to resolving pollution in the basin and is a difficult point to which attention needs to be paid both currently and in the future. The non鄄point source pollution is the result of multiple factors such as soil, topography, hydrology, socio鄄economic development, management methods and land use, and it is closely related to the landscape distribution pattern. Reasonable landscape distribution can improve water quality by reducing the output of non鄄point source pollution, and hindering the transfer of watershed pollutants to receiving waters. Landscape pattern index can also be a good description of landscape heterogeneity, and the location鄄weighted landscape contrast index (LCI) can quantify non鄄point source pollution. However, little work has been done on the concrete relationship between the water quality index and the landscape index. In order to investigate responses of water quality to landscape pattern in the Taihu Basin watershed, 3 typical streams
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