As is known, soil erosion is one of the most serious problems in our eco-environmental protection. This paper focuses its attention on the development of a method for estimating soil erosion in the Wubuxi Watershed, Fujian, based on such approaches as the geographic information system (GIS), the remote sensing (RS) technology and the revised universal soil loss equation ( RUSLE). First of all, we have used ERDAS IMAGINE 8.4 to supervise the classification of remote sensing image treatment of the watershed in 2001 and 2003 according to the spatial distribution characteristics of soil erosion in the watershed study area. Secondly, we have analyzed the features of such soil erosion phenomena, with various physical parameters of RUSLE such as K, LS, C, P, and R derived from the processing of our investigation information and remote sensing data through combination of DEM and soil distributing map on ArcView3.2 interface. And, thirdly, the soil erosion intensity map as well as the quantity of the Wubuxi Watershed in 2001 and 2003 was obtained effectively by using the model of overlay analysis based on ArcView3.2. The results of our research show that there was a visible discrepancy between the two periods in the soil erosion in the region under study, with the moderate and higher erosion intensities accounting for 88.1 ％ of the total area in 2001 while that in 2003 accounting for 59.8％. Bes-dies, the soil erosion degree and its change with different factors have been carefully analyzed, which provides highlights to the dynamic parameters of RUSLE, such as C, R, and Borne other land use data, including farmland, forest land, dry land, meadow, etc. All the above results investigated indicate that the rainfall erosion factors contribute a lot to the current soil erosion consequences, which made the situation of soil erosion of the watershed in 2001 much worse than the one in 2003. And, last of all, the paper has brought about some suggestions on how to alleviate the current soii erosion situation and how to avoid irrational land abuse by taking effective measures to protect the eco-environment of the Wubuxi Watershed in the future.
environmental sciencegeographic information system (GIS)remote sensing (RS)revised universal soil loss equation (RUSLE)the Wubuxi Watershedsoil erosion
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