水土保持是长江流域可持续发展的基础

Soil and Water Conservation Is Fundamental to Sustained Development in the Yangtze River Basin

长江流域现有水土流失面积56.2万km^2,占土地总面积的31.2%,占全国水土流失面积的15.3%,年侵蚀量22.4亿贫,年侵蚀模数3981.8t/km^2.经过40多年的水土保持综合治理,长江流域已高标准地完成治理面积4.58万km^2,既提高了林草覆盖率,减少了土壤侵蚀量,又增加了粮食产量,培养了新的经济增长点,推动了农业可持续发展.长江流域的治理目标是:“九五”期间治理5.0万km^2,2000～2010年治理15万km^2,2010～2025年治理30万km^2,基本实现15年初见成效,30年大见成效.

There are 562 thousand km2 of soil loss area in the Yangtze River Basin, covering 31. 2% of the total land area and 15. 3% of the total national soil loss area. The annual erosion amount in the total basin is 2. 24 billion tons with erosion modulus 3 981. 8 t/km2. Through more than 40 years of soil and water conservation comprehensive management, the Yangtze River Basin has controlled 45. 8 thousand km of soil loss area, which not only increases forest-grass coverage and decreases soil erosion amount, but also increases grain output and forms a new economy-increasing point, therefore improves sustained development of agriculture. The control targets of the Yangtze River are as follows: controlling 50 thousand km2 soil loss land during the period of 'the Ninth-five Years , 150 thousand km during the period of 2000 ~ 2010, 300 thousand km2 during the period of 2010 ~ 2025, basically realize primary benefit in 15 years and gain great benefit in 30 years.