Abstract:

Global change lead to a series of environmental effects.Soil erosion is one of the most sensitive environmental effects to global change.This paper select Xiaojiang basin which one of the most fragile ecological environment as study object.Land use and precipitation changes of three periods was obtained using remote senses and rainfall stations,meanwhile the soil erosion response to land use and precipitation change were analyzed according to USLE model and basic geographical information data.The results show that the precipitation has there periods in which the precipitation is low from 1981 to 1990 is high from 1991 to 2000,and the precipitation decreased sharply from 2001.The average soil loss values is 7058,8008 and 7981 t/(hm2〖DK1〗·a) in 1987,1995 and 2005 respectively,and the percent of area of above moderate degree is 2992%,3383% and 3318% in 1987,1995 and 2005 respectively.The extreme high degree of soil loss is 915%,1281% and 1263% in 1987,1995 and 2005 respectively and increased continued.At meanwhile,we analysis the distribution and change in different altitude and slop.The USLE model can be used to assess the soil loss response to global change.It also indicates that USLE associated to GIS model is a useful and efficient tool for evaluating and mapping soil erosion risk and providing scientific basis for land resource management and economic activities.〖HJ1〗〖HJ〗