【摘要】 以二滩库区为研究区,运用通用水土流失方程(USLE),监测库区蓄水前后3个时间点(1995、2000年和2005年)汛期水土流失面积、水土流失量、水土流失强度结构等级转化、空间分布变化、防治强度预报等级的变化情况。研究发现:1995—2005年,二滩库区水土流失强度等级以微度、轻度和中度水土流失为主,三者面积之和占库区的97%左右;水土流失量以轻度流失区和中度流失区的为最大,二者之和占总流失量的76%左右;高水土流失强度等级一般都分布在水系沟谷比较发育的地区。10年来库区水土流失强度较高等级不断向较低等级转化,需要治理区和急需治理区的面积一直呈减少趋势,表明水土流失情况得到明显改善。更多还原

【Abstract】 By using the revised universal soil loss equation(RUSLE),the authors monitored and analyzed the change of soil loss in flood seasons in the Ertan reservoir area before and after reservoir impoundment at 3 time points of 1995,2000 and 2005.The results show that the soil losses at slight-level,low-level and medium-level are the main classes of soil loss in the reservoir area.The summation of the three classes is about 97% of the total reservoir area.The amounts of low-level and medium-level soil loss area are the biggest,accounting for 76% of the total.Badly soil loss occurred mainly in well developed area with gullies.In the period from 1995 to 2005,soil losses were transformed from high-level to low-level continuously.The areas in need and urgent need of treatment were decreasing.This means soil loss in the Ertan reservoir area is remarkably getting better.更多还原