Abstract: Hunshandake Sand Land is one of the four main sandy area of China.It is also one of the districts that are sensitive to climatic changes and human activities.Since 1960s,due to the irrational human activities,especially over-grazing,this sand pasture has been deteriorated and desertified severely.Consequently,not only the pasture productivity has been reduced,but also the development of livestock industry has been restricted seriously.Now Hunshandake Sand has become one of the main sand source for Beijing and Tianjin Region.Thus,daily life of local people and ecological safety are under more and more serious threat.The paper took Zhenglan Banner,Inner Mongolia,as an example.We analyzed the vegetation types and its distribution characteristics,measured and calculated the production capacity and evaluated the pasture resources.The theoretical stocking density of the sandy pasture in Hunshandke Sandy Land was also discussed which provided a theoretical basis for scientifically and rationally use of pasture resources.

Key words: Stomatal conductance, Aneurolepidium chinense, Conductance simulation