Abstract:

Because of special geography and climate environment, the water circulation mechanism in the source of Yangtze River has a distinct characteristic. According to the features of climate, precipitation, glaciers and permafrost in the source region of Yangtze River, the transfer mechanisms among water vapor, solid water and liquid water are analyzed. Results show that despite the lack of rainfall in the source region of Yangtze River, there are huge amounts of solid water storage. Its unique characteristics of water conversion mechanism have constructed a fragile ecological system in the Yangtze River source. Once the water cycle mechanism changes, the ecological environment will be significantly affected.

Key words: the source region of Yangtze River , rainfall , water cycle , eco-system