【摘要】 研究了在棉花生长的早期、中期和后期转Bt(bacillusthuringiensis)基因棉和常规棉两种棉田的节肢动物群落、害虫亚群落和天敌亚群落多样性。结果表明 ,GK 12未防治区的节肢动物群落多样性指数和害虫亚群落的多样性指数在棉花生长前期和后期要高于泗棉 3号未防治区 ;GK未防治区的天敌亚群落多样性指数在棉花生长后期高于泗棉 3号未防治区 ,在棉花生长的早期和中期 ,两者的大小没有表现出显著性差异。对影响棉田生态系统 3种多样性指数的因子的方差分析表明 ,棉花品种和化学防治措施的共同作用是影响棉田生态系统节肢动物群落和天敌亚群落多样性指数的主要因子。更多还原

【Abstract】 In the first, middle and late stage of cotton growth, diversities of arthropod community, pest sub-community and natural enemy sub-community in the transgenic Bt cotton (GK-12) and nontransgenic cotton (SI Cotton 3) agroecosystems were studied. The treatments included: (i) GK-12 with no insecticide treatment,(ii) GK-12 with insecticide treatments, (iii) SI cotton with no insecticide treatment and (iv) SI cotton with insecticide treatments. The results indicated that in the first stage and late stage of cotton growth, diversity indexes of arthropod community and pest sub-community in the GK-12 with out insecticide treatment were higher than those in the SI cotton with out insecticide treatment. In the late stage of cotton growth, diversity index of natural enemy sub-community in the GK-12 with out insecticide treatment were higher than those in the SI cotton with not insecticide treatment. The F-test indicated that varieties×insecticide-treatment was the main factor influencing the diversity of arthropod community and natural enemy sub-community in cotton agroecosystem.更多还原