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长江流域是我国重要的农业区和经济区,在国民经济建设中具有举足轻重的战略地位。然而,由于自然和人为原因,流域的水土流失十分严重,流失面积达56.2万平方公里,年土壤侵蚀量24亿吨,占全国的48％。尤以上游地区最为剧烈,水土流失面积达35.2万平方公里,年土壤侵蚀量16亿吨,占全流域的67％。严重的水土流失,造成流域内的经济发展极不均衡,阻碍着上游地区社会经济的发展,对中下游地区持
The Yangtze River valley is an important agricultural area and economic zone in our country and plays an important strategic position in the national economic construction. However, due to natural and man-made causes, soil and water loss in the basin is very serious, with an area of 562,000 square kilometers and annual soil erosion amounting to 2.4 billion tons, accounting for 48% of the national total. Especially in the upper reaches of the most violent area, soil erosion area of 352,000 square kilometers, annual soil erosion 1.6 billion tons, accounting for 67% of the basin. Severe water and soil loss, resulting in very uneven economic development within the basin, hindering the socio-economic development of the upper reaches of the region holding