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Analysis on Sand Granularity and the Effects of Water and Heat Change on Environment ──A Case Study in Gurbantonggut Desert

Wei Wenshou(Xinjiang Institute of Geography, Chinese Academy of Sciences,Wulumuqi 830011 )  
Gurbantonggut Desert is the second largest desert in China. It forms in an arid area far away from seas and oceans,and does not be affected by monsoon. Under the influence of the regional topography and western air current, a particular regional climatic environment forms. This paper mainly discusses the granular composition of surface sand in the different types of sand deserts (moving sand desert and fixed sand desert) in Gurbantonggut Desert,and the interrelation between sand granularity and heat transmission in sand layer and sand moisture content. The results of field observation and sample analysis show that heat transmission and moisture movement in sand layer as well as evaporation from sand surface of the different types of the desert are directly related to sand granular composition. Moreover,sand granular composition plays an important role in sensible heat and latent heat of sand surface and feedback of the desert to climate. Meanwhile, sand granularity and change process of water and heat transmission directly influence the survival rate and growth of plants in the desert,and have an important effect on desert climate and environment.
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