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中文摘要：
本文以内蒙古大针茅典型草原为研究对象,通过测定不同放牧强度下土壤各个层次中的地下生物量,探讨随放牧强度增加植物地下生物量及其垂直分布的变化情况,目的是研究植物地下生物量对放牧强度的响应,为草地合理管理提供基础数据。结果表明：随着放牧强度的增大0cm-100cm土层中的地下总生物量减小。对植物地下生物量进行逐层分析发现,轻度放牧可以增加地下表层的生物量,但是中度和重度放牧均使其减少。各个放牧强度下植物地下生物量都随着深度增加而减少,而减少的幅度逐渐降低。但是放牧会影响植物地下生物量的垂直分布格局,放牧使地下生物量垂直分布的不均匀性增加,同时使地下生物量垂直分布趋向于表层化的现象更明显。
英文摘要：
This paper takes Typical Stipa Grandis Steppe as research object,based on the change of the underground biomass in different grazing intensities of all soil layers,we discussed the underground biomass and its vertical distribution change with increasing grazing intensities,in order to analyze the response of vegetation underground biomass to grazing intensities,and provide basic data for rational utilization of grassland.The results showed that,with increasing grazing intensity total underground biomass reduced in 0-100cm soil layer.By analyzing the vegetation underground biomass layer-by-layer,we found underground biomass of surface layer increased in light grazing,while it decreased in moderate and heavy grazing.With increasing depth vegetation underground biomass reduced in all grazing intensities,however the reduced range gradually decreased.Grazing will influence vertical distribution of vegetation underground biomass,and increase inhomogeneity of vertical distribution of underground biomass,meanwhile the phenomenon of underground biomass tends to surface becomes more obvious.
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