森林-草原交错带土壤节肢动物物种相对多度模型拟合研究

应用群落物种多度分布模型:对数级数分布模型、对数正态分布模型、几何级数分布模型和分割线段分布模型研究了森林草原交错带土壤节肢动物群落的种-多度分布关系。结果表明:对数级数分布模型和对数正态分布模型能够较好的拟合交错带大型土壤节肢动物群落的种-多度分布,中小型土壤节肢动物仅能用对数级数分布模型来拟合;几何级数分布模型和分割线段分布模型则不适于描述该区土壤节肢动物群落物种多样性。对数级数分布的参数α和对数正态分布的参数λ是反映群落结构特征内在性质的量,可以作为物种多样性指数运用,能较好地反映群落的物种丰富度。研究结果可为交错区群落物种多样性保护提供理论基础。

Application of various models to the study on relative abundance of soil arthropod animal species in the ecotone of forest-steppe region

Species relative abundance disribution in soil arthropod animal community in the forest-Steppe ecotone in the northern parts of Hebei Province was studied by using patterns of log series distribution,log normal distribution,geometric series distribution and broken stick models to study species-abundance relations of soil arthropod animal community.The results showed that the species relative abundance of macrofaunas in the community could be well described by log series distribution and log normal distribution models,while that of mesofaunas could only be well described by log normal distribution model.The geometric series distribution and broken stick models could not be used to describe the soil arthropod animal community in the ecotone of forest-steppe region.The parameters of log series distribution α and log normal distribution λ,the intrinsic characteristics related to community structure,could be used as species diversity indices and better reflect the richess of soil arthropod animal community.It is suggested that these methods might be useful for the protection of biodiversity of the soil arthropod animal community.