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| Effects of land-cover types on sediment yield in the Three-Gorge Region of Yangtze River |
| Zhang Hongjiang,Cheng Jinhua,He Fan |
| College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China |
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Abstract The effects of land-cover change on sediment yield in Simian Mountain were studied to probe into temporal and spatial variation rule of sediment yield and the relation to environment change in the Three-Gorge Region of Yangtze River.Thirty soil erosion plots were located.The influence of different vegetation types on sediment yield was studied by analyzing process of rainfall,and soil erosion on different degrees slopes under different land-use condition.Results showed that sediment yielded from slope chiefly come from arable land and bare land located at slope,and the quantity of sediment yielded from arable land located at the slope above 25°accounted for about 50% of the total sediment yielded from slope.Land cover types had significant effects on sediment yield of slope.At the same time,the amount of sediment could be decreased 71.05%-95.58% if the forest cover rate reached 70%-80%.
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Received: 13 May 2006
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