棉田昆虫群落及时间生态位研究

通过对棉田昆虫群落结构和时间生态位的研究,共记录昆虫39种,隶属9个目,30个科.在害虫种群中,棉叶蝉种内竞争最为激烈,棉蚜的竞争最缓和;大青叶蝉与棉叶蝉的竞争作用强,朱砂叶螨与棉叶蝉的竞争作用弱;在天敌种群中,异色瓢虫种内竞争最激烈,龟纹瓢虫最为缓和;龟纹瓢虫与异色瓢虫的生态位重叠最大,异色瓢虫与棉蚜茧蜂的生态位重叠最小.龟纹瓢虫、中华草蛉与棉田主要害虫的重叠较大,说明龟纹瓢虫和中华草蛉对棉田主要害虫的跟随和控制作用较强.

Investigation on Insect Community and Temporal Niche in Cotton Field

There were 39 species in spring cotton field through the investigation of insect community structure and temporal niche,which belong to 9 orders and 30 families.In the pest community,Empoasca biguttula Shiraki was the fiercest in intraspecific competition,and the Aphis gossypii Glover was the weakest.Competition between Cicadella viridis(L.)and Empoasca biguttula Shiraki was the strongest;competition between Tetranychus cinnabarinus(Boisduva1) and Empoasca biguttula Shiraki was weak.In the natural enemies population,Leis axyridis(Pallas)was the fiercest in intraspecific competition;and Propylaea japonica(Thunberg)was the weakest.Propylaea japonica(Thunberg)and Leis axyridis(Pallas)had the widest niche overlap;Leis axyridis(Pallas)and Lysiphlebia japonica(Ashmead) had the smallest ecological niche overlap.The wide niche overlap among Propylaea japonica(Thunberg),Chrysopa sinica Tjeder and the main pests in cotton field indicated that Propylaea japonica(Thunberg)and Chrysopa sinica Tjeder played an important role in tracking and controlling the main pests in cotton field.