论文部分内容阅读
苜蓿害虫群落结构有以下特点：同翅目害虫是苜蓿地上最繁盛的一个类群，其科数、种数、个体数都是最多；半翅目害虫的科数、种数次之，但个体数较少；直翅目害虫的科数、种数居第三位，但个体数多于半翅目，居第二位。群落多样性指数４月份达最高，为１．９７３；９月份害虫种类最多，指数为１．７４０。本研究着重探讨了不同时期苜蓿害虫群落的相似性和稳定性；对害虫群落树状图聚类分析及排序的结果表明：害虫群落可聚类为两个亚群落。同时对害虫群落作了动态聚类分析。
Community structure of alfalfa pests has the following characteristics: Homoptera is one of the most prosperous alfalfa on the ground, its number of branches, species and individuals are the most; Hemiptera pests of the number of branches, but the number of species, but the number of individuals Less; Orthoptera pest number of subjects, the number of species ranks third, but the number of individuals more than Hemiptera, ranking second. The community diversity index reached the highest in April at 1.973; the most pest species in September, with an index of 1.740. This study focused on the similarity and stability of alfalfa pest communities in different periods. The cluster analysis and sequencing of the pest community showed that the pest communities clustered into two sub-communities. At the same time, the pest community was dynamically clustered.