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| Land use change and its effects on soil and water loss in typical small watershed of Loess Plateau gully region |
| Chen Panpan1, Chang Hongtao2, Bi Huaxing3, Chen Zhihan4 |
| 1. Taizhou College,317000, Linhai, Zhejiang； 2. Forest Station of Mizhi County, 718100, Mizhi, Shaanxi；3. College of Soil and Water Conservation, Beijing Forestry University, 100083 , Beijing；4. Xifeng Soil and Water Conservation Station, Yellow River Conservancy Commission, 745000,Qingyangt Gansu: China |
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Abstract By using RS and GIS technologies, this study were carried out in Yangjiagou small watershed,Loess Plateau Gully Region based on the basic theory of science of soil and water conservation, and the Dongzhuanggou watershed without control measures were taken as control. The land use change and its impacts on soil and water loss were studied by using the data of rainfall, runoff sediment yield and land use during 1954 to 2008, and referencing the “ Standards for classification and gradation of soil erosion” issued by Ministry of Water Resources. The results will benefit promoting optimal allocation model of land use pattern, and supportting the control of soil and water loss in Loess Plateau. Results show that ： 1) Since early 1950s, the control measures of soil and water conservation have brought a great change in land use in Yangjiagou watershed. The area of forest land increased greatly and the area of unexploited land discreased sharply. 2) The effects of soil and water consevation were improved significantly, which was expressed by the reduction of the annual rain generating runoff, runoff, sediment yield and soil bulkd ensity. The area of soil and water loss in strong, extremely strong, and severe were shringking. 3 )Although the soil and water loss had been effectively controlled in Yangjiagou watershed, it still should be strengthened in the control degree of soil and water loss control, adjusting of land use type and land use structure. Some areas of steep cultivated land should be converted into forests, and the planting should be further taken to improve the utilization of unexploited land.
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Received: 20 October 2010
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