Multiscale Spatial Associations and Patterns of Shrub Vegetation in the Desert of the Southern Edge of Mosuowan Region, Xinjiang, China
Shrub vegetation is the main body for wind resistance and sand fixation in desert.Studies on spatial associations and pattern of the vegetation can help to understand their distributive patterns and their function, thus may provide the foundation for scientific management.This research was performed in southern Mosouwan Desert (a branch of Gurbantunggut Desert). Three sampling plots were chosen in a length of 15 kilometers following the direction from Gobi to the hinterland of desert. In each sampling plot (200 m × 200 m), the distribution patterns of six kinds of species were investigated using the model of geostatistics. These species were Ceratoides ewersmanniana, Haloxylon ammodendron, Reaumuria soongorica,Calligonum mongolicunl, Tamarix gracilis and Nitraria roborowski. The results showed that C. ewersmanniana had a distinctive spatial pattern and the spatial autocorrelation distance was 5.6-7.1 m, but sill of C. ewersmanniana was high and had little variance among three plots.The spatial autocorrelation distance of H. ammodendron was about 97 m and was greatly affected by human activity. The distribution of R. soongorica took on a cluster characteristic and largely depended on local environment. C. mongolicunl, T. gracilis and N. roborowski had a low distributional frequency and showed random distribution at three plots. An analysis using the linear model of coregionalization and the fractal dimension of information entropy indicated that there was interaction among C. ewersmanniana, H. ammodendron and R. soongorica. But the interaction was largely affected by environment. With the enlargement of sampling grid, the sill and nugget of cross-semivariogram among C. ewersmanniana, H. ammodendron and R. soongorica increased, indicating that selecting a reasonable size of sampling unit was very important. As H. ammodendron and C. ewersmanniana adapted well to the desert condition and their ecological characteristics were complementary, these two species should be planted in pairs in order to improve the effect of wind resistance and sand fixation in desert.
Geostatistics Linear model of coregionalization Information entropy Gurbantunggut desert
Liu T Jia Y M Liu C Z Zhao X J Zhang Y H Luo C Lin H Y
Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Corps, Shihezi 8 College of Life Science, Shihezi University, Shihezi 832003, China
国际会议
北京
英文
82-90
2006-10-14（万方平台首次上网日期，不代表论文的发表时间）