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| Amount of Soil Loss Under Different Land Use Type in Granite Area of Three Gorges of Yangtze River |
| Gao Zhongqi1,Zhang Hongjiang1,Shi Yuhu1,2 |
| 1.College of Soil and Water Conservation, Beijing Forestry University, 100083,Beijing; 2.Hubei Forestry Academy, 430079,Wuhan: China |
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Abstract Research on the sediment sources in small watershed of Three Gorges Reservoir Area can guarantee hydro-junction engineering's safe working and benefit exertion. In the selected typical small watershed, several soil profiles were dug, and the relationship between physical characteristics of soil under different types of land utilization and soil erosion is analyzed through the investigation of soil erosion, the observation of sediment and runoff in slope plot. The quantity of soil erosion in different slopes and gully under different types of land utilization is measured. The results show that the characteristics of soil grain under different types of land utilization are closely correlated to the extent of soil loss. With the increasing of soil loss, the sorting coefficient for soil particle diameter of A layer decrease in different types of land utilization. The symmetry of diameter groups is low in different types of land utilization. Sediment in granite area of Three-Gorges mainly originates from soil erosion in slope. Sediment yielded from slope chiefly comes from arable land located at slope, and the quantity of sediment yielded from arable land located at the slope above 25°accounts for about 50% of the total sediment yielded from slope.
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Received: 02 April 2004
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