关键词: 乌兰布和沙漠, 灌木种群, 空间格局, 半方差函数

Abstract: In this paper, the spatial pattern for 4 main shrub populations in Wulanbuhe Desert, Inner Mongolia was studied by using the semivariogram in Geostatistics. A sample plot with 1 000 m×1 000 m (total area is 100 hectares), which was divided in to 1 600 grids（25 m×25 m for each grid）, was set in southwest of Bayangaole Town. The species and mean crown width of each shrub in each grid were investigated and recorded. Using the software GS+ for Windows, the parameters of the isotropic semivariogram were calculated and the Kriging map was drawn for each shrub population in the plot. According to parameters of the isotropic semivariance model, The spatial distribution of Tamarix chinensis can be described with spherical model of cluster distribution and proportion of spatial structure was high, which indicated less change and the lag of 25 m is appropriate at this area. The spatial distributions for Nitraria tangtorum, follow the exponential model of cluster distribution and proportion of spatial structure was lower. The results will provide the basis of sampling inventory for the desert plants.

Key words: Wulanbuhe desert, shrub population, spatial pattern, Semivariance model