【摘要】 将稻田节肢动物群落按营养关系划分为 5个功能团 ,即植食类、寄生类、捕食类、腐食类和其它类 ,从功能团优势度、功能团内科组成及其优势度、群落主要参数及群落相异性等方面 ,经两年四点的调查就 2个转cry1Ab cry1Ac基因籼稻(Bt水稻 )品系TT9 3和TT9 4对稻田节肢动物群落的影响作了较系统评价。植食类、寄生类和腐食类功能团内某些优势科的优势度在Bt水稻田与对照 (IR72 )田之间有时呈显著或极显著差异 ,如Bt水稻田中茧蜂或姬蜂科的优势度有时明显低于对照。但是 ,在大多情况下Bt水稻田与对照田之间功能团优势度、功能团内科组成及其优势度、群落主要参数 (物种丰富度、Shannon Wiener多样性指数、均匀性指数、优势集中性指数 )及其时间动态基本无明显差异 ;Bt水稻田与对照田间植食类、寄生类、捕食类亚群落和整个节肢动物群落的相异性大多较低。可见 ,Bt水稻对稻田节肢动物群落基本无明显的负面影响更多还原

【Abstract】 The community of arthropods in rice paddy was divided on the basis of nutritional relationships into five guilds, i.e., phytophages, parasitoids, predators, detritivores and others, and the effects of two indica lines (TT9 3 and TT9 4) of transgenic Bacillus thuringiensis rice ( Bt rice) with a fused gene of cry1Ab/cry1Ac on this community were investigated and evaluated in terms of guild dominance, family composition and dominance, as well as the usual indices, at four locations for two years. The control community was that of an untransformed (IR72) rice crop. Significant differences in the dominance of some superior families in phytophagous, parasitoid and detritivorous guilds were found between Bt rice plots and the control. For example, the dominance of the Braconidae and Ichneumonidae in Bt rice plots was sometimes markedly lower than in the control. In most cases, however, there were no significant differences in guild dominance, family composition and dominance or common community indices such as species richness, Shannon Wiener diversity index, evenness index and dominance index. The temporal dynamics of Bt rice plots and the control were also similar. Meanwhile, most of the dissimilarities between phytophagous sub communities, parasitoid sub communities, predator sub communities and arthropod communities as a whole in Bt rice plots and the control were apparently low. It was apparent that planting of Bt rice generally did not have any marked negative effect on the rice paddy arthropod community.更多还原