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通过对抚仙湖流域1974年MSS,1990年TM,2000、2006、2009、2012年ETM+、2014年OLI数据的土地利用/覆被(LUCC)、复合植被指数、水土流失、土地沙化和土壤含水率各指标的获取,构建流域土地退化评价模型,开展抚仙湖流域土地退化评价研究,并采用层次分析法(AHP)构造包含上述5种指标的判断矩阵,利用层次分析软件对判断矩阵的计算分别获得上述退化指标的权重,通过GIS空间分析方法完成对抚仙湖流域土地退化的动态监测与评价并由此提出退化防治综合措施。结果表明:抚仙湖流域土地退化从1974~1990年总退化面积趋势急剧上升,到2000和2006年土地退化面积又有小幅下降,2009和2012年期大幅下降,土地退化总面积到2012年为200.27km~2达到历史最低,2012~2014年总退化面积又有小幅增加,但增幅不大。
The land use / cover (LUCC), compound vegetation index, water and soil loss, land desertification and soil water content in the Fuxianhu Basin MSS 1974, ET 2000+, 2009-2010, ETM + Rate of each index, build land degradation assessment model of basin, carry out land degradation evaluation of Fuxian Lake Basin, and use analytic hierarchy process (AHP) to construct a judgment matrix containing the above five indicators, and use the analytic hierarchy process to calculate the judgment matrix The weights of the above degradation indexes are respectively obtained, and the dynamic monitoring and evaluation of the land degradation in Fuxianhu Lake Basin is completed by GIS spatial analysis method, and the integrated measures for prevention and control of degradation are put forward. The results show that the total degradation area of Fuxianhu Lake Basin has sharply increased from 1974 to 1990, and the area of land degradation decreased slightly again in 2000 and 2006, but dropped sharply in 2009 and 2012. The total area of land degradation in 2012 was 200.27km ~ 2 reached the lowest level in history, with a slight increase in the total area degenerated from 2012 to 2014, but with little increase.