中文摘要：

草原土壤跟植被有密切的关系，它们之间的关系对草地的退化和恢复机制研究十分重要。通过对内蒙古草原区（主要是典型草原）具有不同群落特征的14个样点进行植被与土壤调查，分析植被群落数量特征与土壤理化指标之间的相关关系，探讨围封与放牧作用下植被、土壤响应差异。结果表明：群落地下生物量、群落盖度、单位面积物种数与土壤有机碳、全氮含量均呈显著正相关关系（P〈0．05），与土壤容重呈显著负相关关系（P〈0．05）。土壤全磷含量与群落地下生物量和群落盖度存在显著正相关关系（P〈0．05），而与单位面积物种数相关不显著。由于地上现存生物量受随机放牧和围封的影响较大，与土壤各项指标之间相关不显著。在围封26年、7年、2年和自由放牧4个样地中，土壤各指标除表层容重变化显著外，土壤粒径组成和有机碳、全氮、全磷含量变化均不明显（P〉0．05），但4个样地在群落盖度、高度、生物量、群落物种数量、丰富度指数、多样性指数等群落数量特征上均呈现显著差异（P〈0．05）。基于上述研究结果讨论了植被与土壤之间的关系，并提出了人为驱动力作用下草原植被-土壤响应差异的概念模型。

英文摘要：

There is a close relationship between vegetation and soil in steppe. Their relation is important to degradation of grassland and its restoration mechanism research. Fourteen plots with different community characteristics in Inner Mongolian steppe area （mainly typical steppe） were selected to research vegetation and soil, analyze the relation between community quantitative characteristics and soil physical and chemical indicator, and discuss the influence of enclosure and grazing on the soil - vegetation. The results indicated that there were significant correlation between soil organic carbon, total nitrogen and bulk density, community underground biomass, community coverage and unit area species number （ p 〈 0.05 ）. Soil total phosphorus content and community underground biomass, community coverage showed considerable correlation （ p 〈 0.05 ） while there was no significant relationship between soil total phosphorus and unit area species number. The plots 2, 3, 4, and 7, which stands for 26 - year, 6 - year, 2 - year enclosed plots and free grazing site respectively, showed no significant distinction of their soil conditions ; yet there were significant differences between the community composition and quantity characteristic, which were indicated mainly by community species number, diversity index, community coverage and above ground biomass. Finally, the correlation between vegetation and soil was discussed, and the conceptual model on response difference of vegetation and soil to disturbance was presented.