中文摘要：

物种间区域分布与局域多度之间的正相关关系是宏生态学的经典模式之一,即局域高密度的物种地理分布范围广,而局域低密度的物种地理分布范围较窄.这种模式在不同的大型生物类群中得到了广泛的证实.但是微生物群落的相关研究还比较薄弱,并且已有工作主要集中在水体环境中.本文以内蒙古草地土壤细菌为研究对象,在3个不同的空间尺度上采集土壤样品,探讨土壤细菌区域分布与局域多度之间的关系.结果表明,在不同的地理尺度上,土壤细菌区域分布与局域多度之间均呈现显著的正相关关系,二者之间的相关性随分类阶元的降低而有所减弱.该结果暗示细菌群落中常见种和稀有种的多样性维持机制可能存在差异,生态位和中性过程可能同时在起作用.

英文摘要：

Positive interspecific relationship between regional distribution and local abundance is a classic macroecological pattern. Widespread species are likely to occur at high densities whereas species restricted in their distribution tend to be scarce. This pattern has been widely demonstrated in various macroorganisms. However, such studies in microorganisms are still rare, most of which focus on aquatic ecosystems. In the present work a field survey was implemented to analyze the relationship between soil bacteria regional distribution and local abundance on three different geographic scales in Inner Mongolia grassland. Significant positive relationships between soil bacteria regional distribution and local abundance were observed at all geographic scales, and the corresponding relationships became weaker with increased taxonomic resolution for bacteria. These data suggest that abundant and rare soil bacteria may have different mechanisms to maintain biodiversity. Niche and neutral process may play important roles simultaneously.