夏棉田昆虫群落结构的研究

目的]为夏棉田害虫治理对策提供科学依据。方法]采用5点取样法调查取样范围内地面和植株上所有昆虫、螨类等种类和数量,计算昆虫群落的丰富度、优势度指数、均匀度指数和多样性指数,研究该夏棉田昆虫群落的结构。结果]夏棉田中昆虫群落组成较为丰富,由10目30科43种昆虫组成,丰富度最大值为22,害虫类和天敌类昆虫的相对丰富度分别为80.22%和19.78%。昆虫群落的多样性指数最大值为2.095 1,均匀度最大值为0.738 5,群落的优势集中性指数最大为0.954 4。夏棉田害虫优势种是棉蚜和烟粉虱;天敌优势种为棉蚜蚜茧蜂。结论]该研究对棉花害虫的可持续治理有重要的指导意义。

Study on Insect Community Structure in Sunmmer Cotton Field

Objective] The aim was to provide the scientific basis for the management countermeasure of pest in summer cotton field.Method] The insect community structure in the summer cotton field was studied by investigating the species and quantity of all the insects,mites on the ground and in the plants in sampling range using five point sampling mode and calculating the richness,dominance index,evenness index and diversity index of insect community.Result] The insect community composition in the summer cotton field was rich and it was consisted of 43 species,30 families and 10 orders.The maximum richness was 22 and the relative abundance of pest and natural enemy were 80.22% and 19.78%,resp.The maximum of the insect community diversity index,evenness and the dominant concentration index were 2.095 1,0.738 5 and 0.954 4,resp.The dominant species of pest in summer cotton field were Aphis gossypii and Bemisia tabaci and that of natural enemy was Lysiphlebia japonica.Conclusion] This research had an important directive meaning for the sustainable cotton pest management.