山地陡坡垦殖引起水土冲刷，危害生态安全。生产发展和人民的安居乐业，这是大家都知道的，但一直没有引起人们足够的重视。只有当长江流域特大水灾的发生，严重威胁到广大人民的安全，才牵动全国人民的心，特别是意识到与长江上游高山峡谷地区大面积森林采伐和垦殖密切相关时? Reclamation of mountainous steep slopes causes soil and water erosion, endangering ecological security. As we all know, the development of production and the people’s livelihood have not given enough attention to people. Only when the floods in the Yangtze River area seriously threaten the safety of the broad masses of the people can they affect the hearts of the people throughout the country, especially when they are closely connected with the large-scale deforestation and cultivation in the alpine gorges area in the upper reaches of the Yangtze River.