基于AHP的茂县土壤侵蚀时空格局动态变化

Spatial and Temporal Changes of Soil Erosion in Maoxian Area of Sichuan Province Based on AHP

以遥感(RS)和地理信息系统(GIS)为平台,以四川省茂县为研究区域,依据土壤侵蚀程度的评价原则选取对研究区域土壤侵蚀影响较大的5个评价因子,包括坡度、植被盖度、土壤可蚀性因子、降雨侵蚀力和水土保持措施因子,运用层次分析法(AHP)计算各评价因子的权重,然后根据多因子分析将土壤侵蚀程度分成5个等级——微度侵蚀、轻度侵蚀、中度侵蚀、强度侵蚀、极强度侵蚀,得到茂县土壤侵蚀的等级分布。结果表明,茂县土壤侵蚀还在可控制范围内,没有强度侵蚀和极强度侵蚀的地方。

Using remote sensing （RS） and geographical information system （GIS） as the research platform, taking Maoxian of Sichuan province as the research area, five major factors that affect on soil erosion were choose based on the assessment principles of soil erosion, including slope, vegetation coverage, factor of soil erodibility, erosive force of rainfall and the factor of soil and water conservation measures, and their weight was calculated by analytic hierarchy process （AHP）. Then the soil erosion was divided into five levels using the G1S spatial overlay function, including micro erosion, mild erosion, moderate erosion, serious erosion and very serious erosion. Finally, the level distribution of soil erosion of Maoxian has been created. The results showed that the soil erosion status of Maoxian was still under control, and no serious erosion and very serious erosion level.