Comparative Analysis of Arthropod Communities in Transgenic Bt and Non-Transgenic Poplar-Cotton Composite Systems

【Objective】This study aims to analyse the composition and structure of arthropod community in the Bt gene poplar-cotton composite system,in order to evaluate ecological safety of transgenic poplar-cotton composite system.【Method】The non-transgenic poplar-cotton composite system Ⅰ and transgenic poplar-cotton composite system Ⅱ were constructed in a forest farm at Guojiawu village,Yihezhuang town,Zhuozhou City of Hebei Province.The composition and structure of arthropod community,sub community and different functional groups as well as community time dynamic changes were investigated for three consecutive years by using the method of community ecology.【Result】The two systems had significant differences in the total number of species in arthropod communities, and there was no significant difference in the total number of species and the diversity index.The number of pest sub-community species in the transgenic poplar-cotton composite system was significantly lower than that of the control(P