关键词: 西藏"一江两河", 沙漠化, 成因, 发展趋势

Abstract:

The midstream region of Yarlung Zangbo River is an important development and construction region in Tibet in recent years.but the fast development of desertification has caused immense damages to its social and economic development,so the study on desertification in this region is significant.This paper studies the causes and development trend of desertification in this region through analysis of natural and human factors as well as their relationship.It can be concluded that the descrtification in the midstream region of the Yarlung Zangbo River is one process which is accelerated and intensified by human activities through the mutual action of natural and human factors on the basis of the slow natural dcscrtification process.It is resulted from the dislocation of unrational and intensive human activities and fragile ecologic envirtonmnt and meagre natural resources and tends to become more wide and severe.

Key words: Yarlung Zangbo River Tibet, Descrtification, Ecological environment