基于DEM的东江源区土壤侵蚀研究

DEM-based study of Soil Erosion in Dongjiangyuan Region

采用RS与GIS技术,研究东江源区2000年的土壤侵蚀状况。利用研究区地形图制作的数字高程模型(DEM),派生出坡度、坡向图。借助于分布指数,通过空间叠加分析,从高程、坡度和坡向3个方面对研究区的土壤侵蚀进行了定量分析,揭示土壤侵蚀在这3个方面上的分布特征。结果表明,土壤侵蚀是自然因子和人为因子综合作用的结果,自然因素是土壤侵蚀发生、发展的潜在条件,而人类活动是土壤侵蚀发生、发展或减弱的主导因素。因此,转变不合理的土地利用方式,加强植被的保育和重建是防治土壤侵蚀的关键环节。

By the technique of RS and GIS, the soil erosion of Dongjiangyuan in 2000 was studied. Digital elevation mode （DEM） was firstly made based on the relief map of the researched area, and the slope and aspect map were computed from the DEM. The terrain factors （elevation, slope and aspect） and distribution index were overlapped to analyze the soil erosion. The results showed that the soil erosion was the result of synthetic action of the natural factors and human factors. Natural factors were the potential condition of the occurrence and development of the soil erosion, and human activity was the domi- nant factor of the soil erosion occurrence, development and weakness. Therefore, it was very important to protect vegetation and to change the unreasonable land use patterns for preventinz the soil erosion of this region.