十字花科蔬菜主要昆虫群落时间生态位研究

通过对白菜、甘蓝、花椰菜田主要昆虫群落时间生态位的研究,明确了不同昆虫对时间资源的利用情况.结果表明:害虫中,蚜虫的时间生态位宽度最大,菜粉蝶与甜菜夜蛾、甘蓝夜蛾的时间生态位重叠指数较大,说明这3种害虫在时间资源上竞争较大；昆虫天敌中,蚜茧蜂时间生态位宽度最大,蚜茧蜂、瓢虫与蚜虫的生态位重叠指数较大,说明这2种天敌昆虫的发生时间与蚜虫较为同步,因此在生产中应注意对天敌昆虫的保护利用.

Temporal Ecological Niche of Major Insect Community in Cruciferous Vegetable Fields

By the study on temporal niche of insect community in Chinese cabbage,cabbage,and broccoli field,defined the different insect utilization of resources of time.The results showed that the taphids had the widest temporal ecological niche breadth among the pests.Cabbage butterfly,beet armyworm and cabbage armyworm had larger temporal niche overlap index,this explained the three pests in time to compete on a larger resource.Among natural enemies,aphid braconida had the largest niche breadth.Aphid bees,ladybugs and aphids had the maximum niche overlap index,this explained these two natural enemies of aphids were more synchronized with the time of occurrence.Therefore,the protection and utilization of natural enemies should be noted.