我国是世界上水土流失比较严重的国家之一。据80年代末遥感普查结果,全国各类水土流失面积492万km~2,占国土面积的51.5%,其中水力侵蚀面积179万km~2,风力侵蚀面积188万km~2,冻融侵蚀面积125万km~2。1991年经国务院批准公布了367万km~2,即水蚀和风蚀面积。而冻融侵蚀区的人口很少,主要是正常侵蚀,目前也无力治理, Our country is one of the countries with more serious soil erosion in the world. According to the results of remote sensing survey in the late 1980s, all kinds of soil and water loss areas in China reached 4.92 million km2, accounting for 51.5% of the total land area, of which 1.79 million km2 was affected by hydraulic erosion and 1.88 million km2 by wind erosion. 1.25 million km ~ 2. In 1991, the approval of the State Council announced that 3.67 million km ~ 2, that is, water erosion and wind erosion area. The population of freeze-thaw erosion area is small, mainly normal erosion, at present also unable to control,