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据1982年统计,长江流域水土流失面积已增加到73.94万平方公里,占总面积的41%,比1957年增加了1倍,虽然宜昌站测定年输沙量为6亿吨,但全流域的土壤侵蚀量可达24亿吨,比黄河流域严重得多。水土保持和防护林体系,关系到这一地区的社会经济发展、广大农民的脱贫致富以及改善生态环境的长远利益,也关系到中下游广大地区的长治久安。
According to 1982 statistics, the area of soil erosion in the Yangtze River Basin has increased to 739,400 square kilometers, accounting for 41% of the total area, an increase of 1 times that of 1957. Although Yichang Station measured annual sediment discharge of 600 million tons, Soil erosion amounts to 2.4 billion tons, much more serious than the Yellow River basin. Soil and water conservation and shelterbelt systems are also related to the long-term peace and stability in the vast middle and lower reaches of the country in relation to the social and economic development in this region, the peasants’ propensity to get out of poverty and the long-term interest in improving the ecological environment.