【摘要】 应用群落生态学方法研究转Bt基因保铃棉 (Bollgard) 972、10 9B、6 90与 15 4新品种种植后对江苏沿海棉区棉田节肢动物群落结构组成与多样性的影响。结果表明 :不同保铃棉品种上的棉铃虫等咀嚼口器害虫得到显著抑制 ,而刺吸口器害虫有上升的趋势。害虫的天敌自控作用较对照品种有所增强。各保铃棉品种棉田节肢动物群落多样性H′、均匀度J都略高于对照品种棉田 ,而优势集中性C都略低于对照品种棉田。不同抗性保铃棉品种棉田节肢动物群落特征参数组分的物种丰富度S、群落总个体数N、均匀度J与优势集中性C对群落多样性H′的直接作用与间接作用与对照品种棉田的趋势基本一致。保铃棉高抗、中抗品种与对照品种上的害虫、天敌及整个节肢动物群落的种相似性系数V1与群落相似性系数V2 值都较高。上述结果说明转基因抗虫保铃棉品种棉田的节肢动物群落多样性、稳定性并不比对照品种差 ,具有一定的生态安全性更多还原

【Abstract】 In order to overall evaluate the ecological safety and planting risk of insect resistant transgenic Bt cotton,the composition and diversity of the arthropod community in 4 bollgard varieties（109B,154,690 and 972 ）was studied by means of the quantitative analysis method in Dafeng of Jiangsu coastal region.The results showed no marked difference in arthropod species was found between each of Bollgard varieties and traditional variety check（Sumian 16）.The dominant species and their abundance were very close among them.The parameters of arthropod community structure,including species richness（S）,total individual（N）,community diversity（H′）,evenness（J）and concentration（C）,in each of Bollgard varieties fluctuated near the ones in check.The path analysis of H′with other parameters showed that it was dominant C and J that mainly decided the change of H′for arthropod community in 5 treatments.H′ would be reduced with increasing of （dominant） C and decreasing of J for all treatments. The coefficient of species similarity（V₁） and the coefficient of community similarity（V₂）between each of Bollgard varieties and check were determined by the Sorenen′s formula and all very high.The arthropod community average value of V₁ was 0.575 8—（0.774 2, ）whereas the average value of V₂ was 0.496 1—0.648 4 （respectively.） The results above indicated that the stability of arthropod community of 4 Bollgard varieties was not significantly different from that of traditional cotton and the risk increased by planting Bollgard varieties was not obvious.更多还原