长江上游陡坡耕地退耕的难点与对策

DIFFICULTIES AND STRATEGIES FOR THE DE-FARMING OF STEEP CROPLAND IN THE UPPER REACHES OF THE YANGTZE RIVER

长江上游属于 2 5°以上的陡坡退耕还林地面积达 170万hm2 ,是长江上游水土流失的重要策源地 ,严重制约了该区域社会经济的可持续发展。因此 ,实行陡坡耕地退耕还林是建设长江上游生态屏障的重要组成部分 ,也是生态建设的主要内容之一。本文较为系统地论述了陡坡耕地的形成原因与危害 ,以及退耕的难点与有利时机 。

Steep cropland with a slope over than 25° reaches 1.73 millon hm\+2 in the upper reaches of the Yangtze River,and is the major resource of soil erosion in this region.Sustainable development of the society and economy has inevitably been restricted in the region,so that the de farming and afforestation in the steep cropland become far more significant for the development of the society and economy there.In this paper,the formation of the steep cropland and its negative effects have been analyzed,and the countermeasures for de farming and afforestation have been proposed in consideration of their advantages and disadvantages.