The Typical Watershed of the Three Gorges Reservoir Area Soil Erosion Diversity Change on Different Slope Gradients Taking the Meixi River Watershed as an Example
The diversity of soil erosion in the Meixi River watershed of the Three Gorges Reservoir Region was analyzed,in order to provide references for governance and protection of ecological environment of the study area.[Method]The soil erosion diversity index and evenness index of the Meixi River watershed in the Three Gorges Reservoir Region were studied based on the TM images in the year of 1988,1999 and 2010,supported by GIS technology to extract various types of soil erosion in the area with different slope gradients and calculate soil erosion diversity index and evenness index.[Result] As slope gradients grew,the diversity index and evenness index of soil erosion decrease after increasing with a turning point from 25° to 35°.[Conclusion] The proportion of light-erosion in the study area is 15.57％.Hence,the increase of diversity index and evenness index with gradients of 5°-35° shows that the higher erosion intensity,the more uniform erosion types and the indexes decreased in gradients higher than 35°,suggesting that the lower erosion intensity,the better environment.Distribution and variation of different land types have close relation with soil erosion diversity and evenness indexes.Though soil erosion problems have been alleviated,by comparing soil erosion diversity index and evenness index,it can be concluded that changes of indexes are lower than 0.02,and soil erosion should be continued to be well controlled.
NETL
NSTL
万方数据
维普
