典型岩溶区小流域土壤流失量估算研究——以桂林寨底地下河流域为例

Evaluation on Soil Loss of Small Watersheds in Typical Karst Area

为研究岩溶区小流域土壤流失状况,以桂林寨底地下河流域为研究对象,以研究区土地利用为基础,采用多元数据集成的方法,将地理信息系统、遥感技术与修正的通用土壤流失方程相结合,估算岩溶区小流域土壤流失量。结果表明,流域平均土壤侵蚀模数为515.38 t/(km2.a),属于中度侵蚀,年均土壤流失总量为17 007.74 t,强烈及以上土壤流失面积仅占全流域总面积的10.05%,但土壤流失量却占流域土壤流失总量的79.75%。估算结果为岩溶区小流域水土流失研究和治理提供了重要的数据参考。

In order to study the situation of soil loss of small watersheds in karst area,the paper estimated the soil loss of small watersheds in karst area by taking Zhaidi underground river basin of Guilin as an example,taking the land utilization of studied area as a basis,using the method of multiple data sources integration and combining GIS,RS and revised universal soil loss equation model.The outcomes show that: the average erosion intensity of the basin is 515.38 t/(km2·a),belonging to moderate erosion(SL 461-2009 standard);the average annual soil loss is about 17 007.74 t,and the area of soil loss above intensity makes up 10.05% of the total drainage area and the soil loss makes up 79.75% of the total soil loss of the basin.The study has provided an example for the calculation of soil loss of small watershed in karst area.The estimated results can provide basic references for the study on soil loss of small watershed in karst area.