内蒙古中部农牧交错区中小型土壤动物群落特征研究

在内蒙古中部农牧交错区选择农田、退耕地、人工林地和荒漠草原4种生境类型，对中小型土壤动物群落特征进行了研究．结果表明，农牧交错区中小型土壤动物优势类群为线虫(Namatoda)，常见类群为螨类(Acarina)和弹尾类(Collembola)．从4种生境中小型土壤动物群落特征的对比分析看，退耕地的丰富度较高，多样性较大，荒漠草原的各种指数相对较低．从中小型土壤动物的垂直分布看，个体数和类群数随土层深度增加而递减，表聚性明显．不同生境中小型土壤动物个体数和类群数随季节变化具有一定的差异性．春季，人工林地个体数较多，退耕地个体数较少，农田类群数较多．夏季，农田个体数较多，荒漠草原个体数较少，退耕地类群数较多．秋季，人工林地个体数较多．农田个体数较少．人工林地类群数较多，退耕地类群数较少．

Study on the Features of Small-Middle Size Soil Animalls Communities in the Ecotone of Grassland and Farmland in the Middle Area of Inner Mongolia

The features of small-middle size soil animal communities were studied in four habitats in the ecotone of grassland and farmland in the middle area of Inner Mongolia.The results show that the dominant groups are Namatoda and the common groups are Acarina and Collembola.The comparison analysis of the features of small-middle size soil animal communities in the four habitats indicates that the biodiversity and abundance of small-middle size soil animal communities in quitted farmland are relatively higher while the total indices in desert are lower.The analysis of Vertical distribution shows that the number of individual and groups of small-middle size soil animals decrease with increasing soil depth and the surface gathering is obvious.The number of individual and groups of small-middle size soil animals in different habitats vary with seasonal change.In spring, the number of individual is relatively bigger in artificial woodland but smaller in quitted farmland.The number of groups in farmland is relatively bigger.In summer,the number of individual is bigger in farmland but smaller in desert.The number of groups in quitted farmland is relatively bigger.In autumn,the number of individual is bigger in artificial woodland but smaller in farmland.The number of groups is bigger in artificial woodland but smaller in quited farmland.