It has been noted that insect community is a powerful indicator of forest discover and succession. We examined the changes in species diversity and faunal composition of insect along a successional gradient of conifer and broad-leaved mixed forests in Changbai Mountain in this study. Insect community of three habitats, viz. Secondary birch forest (SBF), secondary conifer and broad-leaved mixed forest (SCBF), and original broad-leaved Korean pine forest (OBPF), from the early successional stage to mature forest understory were investigated by using sweeping nets, light traps and pitfall traps. The results showed that a total of 8 183 individuals representing 699 species in 362 orders were recorded. The dominant species were of Lepidoptera and Coleoptera. SCBF had the highest number of individuals and OBPF had the highest number of species, but the number of species and individuals between the successional habitats did not differ significantly. The Fisher' s a index values of SCBF and OBPF were significantly greater than that of SBF, and the diversity at the family level was not significantly different between the three habitats. Insect diversity increased following the herb diversity along the successional habitats. Because of different feeding habits and habitat preference, the diversity of Lepidoptera increased along the successional habitats, while that of Coleoptera decreased, which was similar to that found in previously reported studies.%昆虫多样性变化对生态系统健康有重要的指示作用,为研究昆虫群落变化与生境演替之间的关系,本研究采用网捕、灯诱和诱捕法系统调查了长白山针阔混交林不同演替阶段(次生白桦林、次生针阔混交林、原始阔叶红松林)昆虫群落的组成和多样性,分析了昆虫在森林演替过程中的规律及与植被群落之间的关系.系统调查共采集昆虫标本8 183头,隶属于14个目699种,其中鳞翅目和鞘翅目是主要优势类群.次生针阔混交林昆虫的个体数量最多,原始阔叶红松林中物种数最多.不同演替阶段昆虫群落的物种数和个体数差异不显著,但次生针阔混交林、原始阔叶红松林的Fisher's α指数显著高于次牛白桦林.目水平七的昆虫多样性未表现出著性差异.昆虫多样性在森林演替过程中和草本植物多样性的变化趋势相同;由于食性和生境选择的不同,森林演替过程中鳞翅口昆虫多样性逐渐升高,而鞘翅目多样性逐渐降低.
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