中文摘要：

以水循环为纽带，把水、沙、汽和冰作为一个有机整体，研究了古里雅河和叶尔羌河流域在不同海拔地区的水循环特征及其在环境变化中的作用，发现这两条流域内水循环在不同海拔地区存在着一些特征差异，并对这些特征差异进行了分析。从机制上揭示了这两条流域的水循环在不同海拔地区特征差异的原因，证实了沙尘在该流域不同海拔地区的水循环中起纽带作用。从这两条流域的水循环在环境变化中的作用的研究中，进一步得出了沙尘对我国西北干旱地区的气候变化影响较大的结论。

英文摘要：

With circulating water as a link to water, sand, steam and ice for an organic whole, this paper studied the water circulation characteristics and environmental changes of Guliya River and Yarkant River basins in different altitudes. It found that there were characteristic differences of water circulation in the basin at different altitudes, and analyzed the differences in these characteristics. It revealed the reasons for the differences of the water cycle in the basin at different altitudes, and proved the effect of dust on the water cycle in the different altitudes of the basin. From the study of the role of the water cycle in the environment change, it was concluded that sand dust had an important effect on the climate change in the arid region of Northwest China.