Impact of Land Use Changes on Runoff of Taihu Basin in China

摘要

Taihu Basin is one of the most developed regions in China, and land use has had a great change since last 20 years. Based on 1：10000 airscape photo, land use in Taihu basin was interpreted of 1986 and 1996.Land use characters are analyzed in this paper. Runoff of 1986 and 1996 were calculated using precipitation from May to September of 1991. It is found: 1.The land use changed greatly in the Taihu basin during 1986~1996. Cultivated land decreased by 3385km2, construction area increased by 2460km2. 2. Spatial distribution of land use is different in Taihu Basin. With higher GDP per capita and density population, land use has bigger changes than in other regions; 3. Land use changes have increased runoff from precipitation greatly. Compare to 1986, runoff has increased by 10*108m3 in 1996 if 1991 precipitation was used. Runoff increased much more in upper reaches than in lower reaches; 4. These calculated results are corresponding with high water levels of Taihu Lake in 1990s