华北平原耕作区不同林木类型昆虫群落结构研究

应用生物多样性指数分析了河北省廊坊市不同林木类型中昆虫群落结构特征。采集到的97种昆虫隶属于10目、48科，其中鳞翅目、鞘翅目昆虫为优势类群，人工杨树纯林昆虫群落多样性指数高于经常喷施化学农药的果园，杨白潜蛾、杨扇舟蛾、茶袋蛾等食叶昆虫类是造成杨树纯林树势减弱、易于爆发病虫害的主要诱因。因此，通过改变林木种植模式、采取综合控制措施、增加植物群落多样性等方法，可提高不同林木类型中昆虫群落多样性，增强害虫的自然控制能力，同时对增加鸟类群落多样性、增强鸟类的生物防治作用也具有积极意义。

Studies on the Insect Community Structure in Different Vegetation in the Cultivation Areas of North China Plain

By using the diversity index,insect community structure in different vegetation were studied from June to August in 2004 in Langfang region in the northern part of the North China Plain.The results showea that ninety-seven kinds of species which are belonged to ten orders,forty-eight families were collected in this survey.Among them,Lepidoptera and Coleoptera were dominant groups.The diversity indices of insect community in artifical Populus sp.woodlands are higher than those in orchard in which chemical pesticide has been used largely and frequently.The main factors which lead to pest outbreak are the increasing of insect population of eating leaves,such as Leucoptera susinella,Clostera anachoreta and Clania minuscule.By changing the pattern of planting trees,using integrated control measures and adding the vegetation diversity,the insect community diversity,the ability of insects'natural control and the role of birds'biological control can be enhanced.