关键词: 气候, 人类话动, 水文循环, 生态功能, 内陆河流域

Abstract:

 In recent 50 years, being similar to many water scarcity areas in arid and semi arid regions of the world，the degradation of hydrological cycle and its ecological function and in turn the exacerbation of ecological environment have been occurring over inland river basins in Northwest China.  based on the observed climat。一hydrological data, with the view of interaction among climate, human activities and hydrological cycle, the above mentioned phenomena have been discussed in this paper. 'hhc fact discerned is that hydrological cycle is generating and accompanying as well as coexistence with ecological systems by its various ecological functions.  "hhe overexploitation and utilization of water resources have been beyond the recreating capacity of hydrological cycle and land plain，the dry and in turn the water resources recycle period has been decelerated.  ()wing to the huge arid index in the in warm climate has amplified the negative effect of human activities on hydrological cycle and thus aggra vatcd the ecological
environment.  "hhc human living and economic development arc situated in the area far from the area of mountain water sources in the inland river system，therefore, the approach of integrated water resources management of water shed seems to be an important tool to sustain healthy hydrological cycle or ecosystem as well.

Key words: climatc, human activity, watcr hydrology, cclogical function, inland river basin