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| Impacts of land use and rainfall intensity on runoff and sediment load in the Lu'ergou watershed on the Loess Plateau |
| Chen Yuehong1,2,Yu Xinxiao1,Xie Chongbao3 |
| 1.College of Soil and Water Conservation,Beijing Forestry University,100083;2.International Research and Training Center on Erosion and Sedimentation,100044;3.China National Center for Irrigation and Drainage Development,100054,Beijing: China |
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Abstract This paper describes a developed methodology based on the statistical analyses on sediment yield and runoff volume for individual rainfall events during 1982-2005 of the Lu'ergou watershed,located at the Ganshu Province,in the Loess Plateau.These analysis evaluated the relationships between timely runoff-rainfall and timely sediment runoff for different rainfall intensity and different land use patterns.For the relationships between timely,power and exponential functions were found regarding runoff-rainfall and sediment yield-runoff,respectively.This paper also presents the influences of land use variation on soil erosion under the circumstance of different rainfall intensity of the watershed.The results show that from the long run that is necessary to adjust the land use structure in order to improve the rate of forest land of the watershed.In addition,it is also needed to increase the vegetation cover of the watershed to control soil erosion in Loess Plateau.
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Received: 03 September 2007
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