中文摘要：

采用巴氏罐诱法取样,对大巴山北坡3种主要林型（林区人工林、农耕区天然次生林和农耕区人工林）地表甲虫的类群组成、数量分布进行了分析,并采用对应趋势分析和聚类分析法,研究了3种林型地表甲虫类群组成和数量分布的相似性.结果表明：2002年8月9—13日,研究区共捕获地表甲虫1094号,其中,隐翅虫科和叶甲科分别占40.59%和33.18%,步甲科、球蕈甲科、金龟科、象甲科、蚁甲科和缨甲科均各占1%以上,这8科地表甲虫是该地区常见的类群;地表甲虫的个体数量从林区人工林、农耕区天然次生林到农耕区人工林依次减少;农耕区人工林的科丰富度指数明显低于林区人工林和农耕区天然次生林.大巴山北坡农耕区天然次生林地表甲虫的类群组成和数量分布与林区人工林差异明显,农耕区人工林与林区人工林和农耕区天然次生林各有部分相似性.

英文摘要：

By using pitfall trapping, the species composition and quantitative distribution of grounddwelling beetles in man-made plantations in forest farm （MPFF） , secondary natural forests in farmland （SFF）, and man-made plantations in farmland （MPF） on northern slope of Daba Mountain were analyzed, and detrended correspondence analysis and cluster analysis were adopted to study the similarity of the species composition and quantitative distribution of the beetles among the three forest types. 1094 individuals of ground-dwelling beetles were captured in August 9-13th, 2002. Of these beetles, Staphylinidae and Chrysomelidae accounted for 40. 59% and 33.18% of the total, respectively, and Carabidae, Leiodidae, Scarabaeidae, Curculionidae, Ptiliidae, and Pselaphidae each took more than 1% of the total. These eight families were considered as the common-occurring groups in the study area. The individuals of ground-dwelling beetles decreased from MPFF to SFF to MPF, and the family richness was obviously lower in MPF than in MPFF and SFF. The family composition and abundance of the beetles were significantly different between MPFF and SFF, but partial similarity was observed between MPF and other two forest types.