Issue:ISSN 2095-1353
CN 11-6020/Q
Director:Chinese Academy of Sciences
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2012年49 No.5
Effects of several insecticides on the arthropod mmunity in soybean fields
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Key Words：soybean，arthropod，community，insecticide，disturbance coefficient
Abstract：The species composition of a soybean arthropod community wasinvestigated． The effects of malathion， avermectins，β-cypermethrin and dichlorvos on the community and its sub-communities were compared using communitycharacteristic parameters and a disturbance coefficient developed by ourselves． The results indicate that all insecticides tested had significant effects on species richness，Shannon’s index，homogeneity of sub-communities of natural enemies， insect pests and neutralinsects． The sub-community of neutral insects underwent greater change than other subcommunities． Of the insecticides tested，avermectins had the least，and β-cypermethrin the most，effect on arthropod communities，the latter causing the greatest mortality among natural enemies and the resurgence of soybean aphids． Therewere significant differences in the recovery speed of arthropod communities treated with the four insecticides． In contrast to avermectins，the communities of plots treated with the other three insecticides either recovered more slowly or failed torecover during the period of the study．