西江流域亚热带常绿阔叶林土壤动物群落特征与环境因子的关系

对西江流域生态系统进行健康评价、管理，为生态地理研究提供土壤动物学资料。选取西江流域内6个地区近1 a的生境常绿阔叶林情况，采用DCA和数理统计学方法选择线性模型的RDA冗余度，并进一步分析确定土壤动物群落分布与环境因子之间的关系。结果表明，6个地区土壤中存在1 750只大型土壤动物，分别隶属2门6纲13类，蚁科受到速效P、K影响较大，蚰蜒目、拟步甲科幼虫受到土壤温度影响较大，而等足目、鞘翅目幼虫受到土壤含水量和土壤容重影响较大，蚯蚓类受到土壤含水量、土壤容重和土壤温度影响较大，马陆受到土壤有机质影响较大。土层是影响西江流域（肇庆市段）大型土壤动物分布的因素，土壤因子对研究区主要大型土壤动物的分布有重要影响。

Relationship Between the Community Characteristics of Soil Macrofauna and Environmental Factors in Xijiang River Basin (Zhaoqing Section)

The objectives of this study were to evaluate and manage the ecosystem health of Xijiang River Basin to provide soil zoology data for ecological restoration research.The habitats of the evergreen broad-leaved forests occurring in six regions in the Xijiang River Basin in the past year were taken as the research objects.The RDA redundancy of the linear model was determined by using DCA and mathematical statistical method.The relationship between the distribution of soil animal communities and environmental factors were further analyzed and determined.It was found that there existed 1 750 macro soil faunas,belonging to 2 phyla,6 classes and 13 categories.Formicidae was greatly affected by the available phosphorus and potassium,the larvae of Selenide and Pseudocriminal were greatly affected by the soil temperature,while the larvae of the Isopoda and Coleoptera were greatly affected by the soil water content and soil bulk density,and the earthworms were greatly affected by the soil water content,soil bulk density and soil temperature.Malu was greatly affected by soil organic matter.The results indicated that the soil layer plaid important rule in the distribution of soil macrofauna,and the relative soil factors presented significant influences on the distribution in the study area.