内蒙古高原针茅草原群落土壤水分和碳、氮分布的小尺度空间异质性

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0-20cm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1.91m-10.81m，结构性方差占样本方差的35.31%-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。

On the Small Scale Spatial Heterogeneity of Soil Moisture, Carbon and Nitrogen in Stipa Communities of the Inner Mongolia Plateau

Grassland Vegetation in Inner Mongolia Plateau is the main part of the central Eurasian Steppe region. The gradient distribution of precipitation and temperature is the main factor that affects the zonal distribution of grassland vegetation in the Plateau. Grassland vegetation in the plateau can be divided into three sub vegetation zones: meadow steppe, typical steppe, and desert steppe. They are distributed successively from the east to the west with the increase in temperature and decrease in precipitati...