丹江口库区水土流失遥感监测应用研究——以商南县为例

Research on Soil Erosion Using Remote Sensing Method in Danjiangkou Reservoir——A Case Study of Shangnan County

基于水土流失监测模型QRSM,研究了丹江口库区商南县共698条集水区构成的小流域水土流失现状。结果表明,微度和轻度侵蚀面积占总面积的63.43%,流失量占总侵蚀量的5.27%,集中在商南县北部和南部治理区,水土流失轻度等级以上面积达57.92%。极强度和剧烈侵蚀面积占总面积的20.40%,侵蚀量占总侵蚀量的87.14%,是造成全县水土流失的主要区域,集中分布在以县城为中心的主河道两岸,从698条小流域整体分布来看,中、轻度侵蚀以上面积占总面积百分比超过40%的小流域达560条,占全部698条小流域总数的80.2%。

The current status of soil loss in 698 small watersheds in Shangnan County in Danjiangkou Reservoir area was investigated based on the quantitative remote sensing model （QRSM）. The results showed that the area for weak erosivity and slight erosivity occupied 63.43% of the total study area, the amount of soil loss accounted for 5.27% of total soil erosivity, which focused on the treated area of north and south part of of Shangnan county. The percentage of the area for slight erosivity and above reached to 57.92%. The area for high erosivity and vio- lent erosivity was up to 20.4% of total area, and the soil loss up to 87.14%, which mainly located in the region along the main river around the county city. From the small watershed, the amount of the watershed with the area of slight and moderate erosivity exceeding 40% was up to 560 watersheds, and occupied 80.2% of the total small watersheds in the county.