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. In this paper, changes of sediment yield and sedimenttransport were assessed using the Revised Universal Soil Loss Equation(RUSLE) and Geographical Information Systems (GIS). This model was based onthe integrated use of precipitation data, Landsat images in 2000, 2005 and2010, terrain parameters (slope gradient and slope length) and soilcomposition in Zhifanggou watershed, Gansu Province, Northwestern China. Theobtained results were basically consistent with the measured values. Theresults showed that the mean modulus of soil erosion is 1224, 1118 and 875 t km −2  yr −1 and annual soilloss is 23 130, 21 130 and 16 536 in 2000, 2005 and 2010 respectively. Themeasured mean erosion modulus were 1581 and 1377 t km −2  yr −1 , and themeasured annual soil loss were 29 872 and 26 022 t in 2000 and 2005. From2000 to 2010, the amount of soil erosion was reduced yearly. Very lowerosion and low erosion dominated the soil loss status in the three periods,and moderate erosion followed. The zones classified as very low erosion wereincreasing, whereas the zones with low or moderate erosion were decreasing.In 2010, no zones were classified as high or very high soil erosion.

Changes in soil erosion and sediment transport based on the RUSLE model in Zhifanggou watershed, China