【摘要】 本文对 2种不同栽培措施 (直播棉田与覆盖棉田 ) ,4种不同施药水平 (不施药、施 1次药、施 4次药、施 6次药 )的棉田的昆虫群落的特征指数进行了分析比较。连续多次施药会降低棉田昆虫群落的丰富度、多样性和均匀度。因此 ,在棉田害虫的综合治理中 ,应当不施药或尽量少施药 ,以利于充分利用天敌的自然控制作用 ,维持棉田生态系统的稳定。更多还原

【Abstract】 The characteristics of insect communities in the cotton field of two different cultural approaches and four different chemical control levels were compared. The richness, diversity and evenness of insect community could decrease due to high chemical control level. Therefore, natural control by natural enemies should be fully utilized by reducing chemical control, in order to keep cotton system stable.更多还原