宁夏白芨滩国家级自然保护区地表甲虫群落多样性

2006年7—9月在宁夏白芨滩国家级自然保护区内选取5个不同样地，主要以巴氏罐诱法结合网捕等采集方法对各样地地表甲虫群落组成和多样性变化进行了调查。结果共获得甲虫标本1 896号，分属17科，其中拟步甲科数量最多，占25.58%；叶甲科次之，占20.99%；肖叶甲科、芫菁科和瓢虫科的数量也相对较多，它们共同构成该地区地表甲虫的优势类群。白芨滩样地地表甲虫的物种数和个体数量最丰富；长流水样地的多样性指数、均匀度指数、优势度指数最高；马鞍山样地的物种数、个体数量和与此相应的均匀度指数、多样性指数、丰富度最低。通过聚类分析显示白芨滩样地和大泉样地具有一定程度的相似性，长流水样地与磁窑堡样地相似性程度较高，马鞍山样地与其他4个地点差异最大。表明生境类型差异性与地表甲虫群落的物种多样性和相似性密切相关；荒漠化环境治理使地表甲虫栖息环境的空间异质性增大，从而增加了地表甲虫的多样性。

Community Diversity of Litter-layer Beetles in the Baijitan National Nature Reserve of Ningxia

The community structure and species diversity of litter-layer beetles in five habitats in Baijitan National Nature Reserve of Ningxia were surveyed from July to September in 2006.A total of 1896 beetles were collected by pitfall traps and other methods during field research.The result showed that all specimens belong to seventeen families.The individual of Tenebrionidae was the maximum, accounts for 25.58%;Chrysomelidae takes the second place, accounts for 20.99%;the individuals of Eumolpidae, Meloidae and Coccinellidae were also rich more than other families.These five families were considered as dominant groups.Among the five habitats, the individuals and species abundance of litter-layer beetles were the highest in the Baijitan plot, but the lowest in the Maanshan plot.The indices of species richness, diversity and evenness were the highest in the Changliushui plot, while the lowest in the Maanshan plot.Cluster analysis showed that the community structures and habitats were similar among the Daquan plot, Ciyaobao plot, Changliushui plot as well as Baijitan plot.It is particularly more similar between Changliushui plot and Ciyaobao plot.The community composition and diversity of litter-layer beetles were closely related to the spatial heterogeneity which was restored by the practice of desertification control.