一、长江上游水土流失重点区的现状与问题 长江上游存在4大片陡坡耕地,即金沙江下游及毕节地区、陕南和陇南地区、嘉陵江中下游地区、三峡库区。这4大片陡坡与长江流域暴雨区相重合,形成严重的水土流失。而且从河系水文资料分析,长江上游河流中的高 I. Status and Problems of Key Areas for Soil and Water Loss Correlation in the Upper Reaches of the Yangtze River There are four large areas of steep arable land in the upper reaches of the Yangtze River, namely the lower reaches of the Jinsha River and the Bijie area, the areas of southern Shaanxi and Longnan, the middle and lower reaches of the Jialing River, and the Three Gorges reservoir area. These four large steep slopes coincide with the heavy rainfall areas in the Yangtze River basin, resulting in serious soil erosion. And from the river hydrological data analysis, the upper reaches of the Yangtze River in the high