Abstract: Based on DEM, this study analyses spatial differentiation of vegetation with Picea schrenkiana in Gongliu Tree Farm in Xinjiang as an example. To detect data used in the research which is subject to normal distribution characteristics, the authors illustrate the Normal QQ Plot in ArcGIS9.0 platform. With Moran I index, the authors figure out that distribution of Picea schrenkiana is spatial auto-correlation. Analysis of directional distribution shows Picea schrenkiana runs from northeast to southwest imposed mainly by terrain factors. The overlaying result shows that Picea schrenkiana is mainly distributed at the elevation of 1400~2700 meters. And 77.69% of trees of Picea schrenkiana is distributed on the slope between 15 °~45 °and aspects of north, northeast, west and northwest. It concludes that the relationship between factors of terrain and spatial distribution of Picea schrenkiana is apparently regular.

Key words: DEM, spatial auto-correlation, terrain differentiation, spatial distribution, Picea schrenkiana in the west of Tianshan Mt