麦长管蚜种群动态的模糊聚类分析

利用模糊聚类分析方法对麦长管蚜的种群进行动态分析,揭示出麦长管蚜种群动态的一般规律,以确定最佳的防治时期。通过对麦长管蚜进行定时、定点、定株的系统调查,利用平均密度( x)、平均拥挤度(m )、聚块性指标(m / x)等参数作为指标对麦长管蚜种群动态进行模糊聚类分析。分析结果表明:在小麦生长的中后期(即小麦拔节到收获),把麦长管蚜整个种群动态过程分为八个状态集,4个时期,即点片发生期、初盛期、猖獗危害期和衰退期;而且防治麦长管蚜的最佳时期要在初盛期A3,避免猖獗危害期的出现,以达到经济、有效的控制麦长管蚜危害的目的。

Fuzzy Cluster Analysis on the Marosiphum avenae Fab Population Dynamics

The Fuzzy cluster method was used for studying the population dynamics of insects. In this paper,we used Mean density?Mean crowding and Indies of aggregation and so on to go fuzzy cluster analysisabout%Marosiphum avenae Fab% population dynamics.By the fuzzy cluster analysis of the wheat aphid of population dynamics we divided the whole wheat aphid period into eight state groups or four phases which are patch phase, flourishing phase, rampancy phase and withdraw phase. For the sake of field preventing and controlling the wheat aphid and decreasing the lose of agriculture we should take active actions in the flourishing phase.