中文摘要：

要根据对吉林省左家自然保护区坡地不同坡位土壤动物的调查，以物种多度为指标，运用对数级数分布模型、对数正态分布模型和分割线段模型综合研究了各坡位大型土壤动物群落和中小型土壤动物群落的物种-多度分布格局。结果表明，对数级数分布模型和对数正态分布模型能较好地拟合土壤动物群落物种-多度分布，形成富集种少，稀有种多的格局。但该区土壤动物物种-多度分布不符合分割线段模型。整体上来说，物种与多度呈正相关关系，对数级数分布模型是最优物种-多度模式。

英文摘要：

There are several ways available to measure diversity of biological communities, but the methods of diversity in- dex and species-abundance pattern are the common ones used. To get to know characters of a community, the species-abundance pattern method is more efficient than the diversity index method. In this paper species-abundance distribution of soil animal communities in different positions of a sloping field was studied with a view of introducing a species-abundance distribution model into the study on soil fauna and disclosing in depth the spatial pattern of soil fauna diversity in a micro-region. Based on investigation of the macrofauna and mesofauna communities in piedmont, and the lower, middle and upper parts of a sloping field in the Zuojia Nature Reserve, Jilin Province, China, and by using the log-series distribution model, log-normal distribution model and brokenstick model for fitting of the curves of the species-abundance of the macrofauna and mesofauna communities in different parts of the sloping field, with species-abundance as index, spatial distribution patterns of species-abundance of the two types of soil fauna communities were studied. Results of the analysis were collated with traditional Shannon-wiener index, Pielou index and Mackintosh index. Mechanisms of the formation of such patterns were analyzed and explained, taking into account the characteristics of the natural environment of the study zone. The results showed that the log-series and log-normal distribution models fit well the species-abundance distribution of soil fauna communities, displaying a pattern of enriched species being few, and rare species being plentiful, but the broken-stick model could not. All in all, species was positively correlated with abundance and log-series was the best model. Compared with the traditional method of diversity indexes, the species-abundance pattern was more intuitionistic and more vivid in expressing the characters and difference in diversity of soil fauna communities between different par