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用地统计学的方法 ,研究比较了内蒙古高原 4类地带性针茅草原群落 ,贝加尔针茅 (Stipa baicalensis)群落、大针茅(S.grandis)群落、克氏针茅 (S.krylovii)群落和小针茅 (S.kelemenzii)群落 0～ 2 0 cm土壤水分和碳、氮的小尺度空间异质性特征 ,结果表明 :4类群落土壤水分、有机碳和全氮均表现出显著的小尺度空间结构特征 ,自相关尺度为 1 .91 m～1 0 .81 m,结构性方差占样本方差的 3 5 .3 1 %～ 99.74%。从贝加尔针茅群落到小针茅群落空间自相关的尺度逐渐增大 ,纹理有逐渐变粗的趋势。土壤水分、碳和氮的小尺度空间格局共同作用于群落的生态学过程 ,即土壤水分格局→植物种群格局 (基本斑块的大小 )→土壤碳空间格局→土壤氮空间格局。同时 ,由于生态学过程的反馈作用 ,土壤氮空间格局→种群格局→土壤水分格局。土壤属性空间自相关尺度的改变可能是导致群落演替的驱动力 ,草原退化可能与土壤异质性尺度的改变相关
By means of geostatistics, we compared the Stipa baicalensis community, Stipa baicalensis community, S.grandis community, S. krylovii community in four types of zones in Inner Mongolia Plateau, The small-scale spatial heterogeneity of soil moisture and carbon, nitrogen in S.kelemenzii community showed that: the soil moisture, organic carbon and total nitrogen of four communities showed significant small-scale The spatial structure was characterized by a self-correlation scale of 1.91 m -1 0 .81 m and a structural variance of 35.31% -99.74% of the sample variance. The scale of spatial autocorrelation from Stipa baicalensis and Stipa grandis communities gradually increased, and the texture gradually became thicker. The small-scale spatial pattern of soil moisture, carbon and nitrogen interacted with ecological processes of the community, that is, soil water pattern → plant population pattern (basic patch size) → soil carbon spatial pattern → soil nitrogen spatial pattern. At the same time, due to the feedback of ecological process, spatial pattern of soil nitrogen → population pattern → soil moisture pattern. The change of soil autocorrelation scale may be the driving force that leads to the succession of the community. The degradation of grassland may be related to the change of soil heterogeneity scale