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目前 ,做为长江泥沙的主要来源地 ,长江上游水土流失重点防治区陡坡耕地退耕还林还草已达 70 %以上。据水利部提供的消息 ,目前长江上中游陡坡耕地面积约1 0 0 0万ｈｍ2 ,占现有耕地面积的 44.5 % ,其中大于 2 5°的陡坡耕地 2 4 3万ｈｍ2 ,占坡耕地面积 2 4 .3 %。坡耕地水土?
At present, as the main source of sediment in the Yangtze River, the steep slopes of cultivated land for returning farmland to forests and grasslands in key areas for prevention and control of soil erosion in the upper reaches of the Yangtze River have reached over 70%. According to the information provided by the Ministry of Water Resources, the steep slopes of the upper and middle reaches of the Yangtze River currently have an area of about 10 million hectares of cultivated land, accounting for 44.5% of the existing cultivated land, of which 243,000 hectares are steep slopes of more than 25, accounting for 2 4 .3%. Sloping farmland soil and water?