一熟转Bt基因棉田昆虫群落研究

以转Ｂｔ基因棉品系Ｒ９３－４ 为试材，常规棉中棉所１２ 为对照，研究了转Ｂｔ基因棉田昆虫群落的变化。结果表明，转基因棉田昆虫群落、害虫和天敌亚群落的种类丰富度、均匀度和优势集中性均高于常规棉，总个体数、害虫的相对丰盛度和多样性指数均低于常规棉；优势害虫种类的变化较大，棉铃虫已不是转基因棉田的优势害虫，棉蚜、红蜘蛛、叶甲类、棉蓟马等已上升为优势害虫；优势捕食性天敌种类无明显变化，仍为龟纹瓢虫和小花蝽。转基因棉田采取综合防治后昆虫群落和害虫亚群落与常规棉相比有较好的稳定性。

Study on the insect community of single transgenic Bt cotton field

Insect community of single transgenic Bt cotton field were studied in three experimental plots of cotton,where the transgenic Bt cotton R93 4 was planted and integrated pest management was carried out (IPM),pests were controlled only by their natural enemies (NEC),and the routine cotton CCRI No.12 was with no insecticide application throughout whole growing seasons (CK).The result showed that the number of species,evenness index and dominant concentration index of the insect community and the sub community in transgenic Bt cotton fields were all higher than that in routine cotton field,and that the total number,and the abundance of the pests and diversity index were all lower than that in routine cotton fields.Cotton Bollworm was not the dominant pest of transgenic Bt cotton field,but the aphids and red spider mite become the dominant pests.The insect community and pest sub community in IPM were more stable as compared with those in CK.