Abstract: Picea schrenkiana var tianschanica,as a dominant species in Xinjiang Tianshan mountain forest,is an endemic species in central Asian mountainous areas and it exists only in Xinjiang in our country.As the main body of Tianshan mountain forest ecological system,Picea schrenkiana forest plays a vital role in water conservation,water and soil conservation,adjusting the climate.Research on stand structure with longitude change of Picea schrenkiana has important significance to scientific and reasonable management of Picea schrenkiana.In July 2011,Picea schrenkiana stand structure was investigated in Mulei State Forest Farm of east Tianshan Mountains,Xinjiang Agricultural University Forest Farm of central Tienshan mountains and West Tianshan National Nature Reserve in west Tianshan Mountains.Investigated sample area is 1hm²(100m×100m),method is negative exponential function and q inspection.Diameter distribution function of Picea schrenkiana is that N=188.973 9e^-0.0705D,q=1.33 in east Tianshan;N=63.952 5e^-0.0300D,q=1.13 in central Tianshan;N=15.993 7e^-0.0182D,q=1.08 in West Tianshan.The results of the study show that small trees have higher density in east Tianshan,big trees have higher density in west Tianshan.According to q value size,tree high structure and age structure,the different management measures should be adopted to Picea schrenkiana growing from the eastern Tianshan to central Tianshan to west Tianshan to realize Picea schrenkiana multi-functions sustainably.

Key words: Picea schrenkiana var.tianschanica, diameter distribution, negative exponential function, constant ratio q law, forest management