花椒园棉蚜及其捕食性天敌动态的模糊聚类分析

Fuzzy cluster analysis of the cotton aphid and its predators in Chinese prickly ash orchard

为了了解花椒园棉蚜捕食性天敌对棉蚜的控制作用,采用模糊聚类方法对花椒园棉蚜及其捕食性天敌种群的动态进行分析。结果表明,对不同时期的棉蚜及其捕食性天敌的种群进行模糊聚类得出结果,棉蚜种群的17次调查结果可以聚为7类,λ=0.8300;其捕食性天敌的调查结果同样聚为7类,λ=0.9400。聚类结果阐明了花椒园中棉蚜及其捕食性天敌随季节变化的差异;同时反映了棉蚜的种群消长与其捕食性天敌的数量密切相关,是抑制花椒园棉蚜种群消长的主要因素之一。

In this paper, seventeen investigations were conducted on the population dynamics of cotton aphid and its predators in Chinese prickly ash orchard, and the fuzzy duster method was used for studying the population temporal dynamics of cotton aphid and its predators of Chinese prickly ash. The population of cotton aphid could be clustered into 7 clusters （λ= = 0. 8300）. The population of predators could be clustered into 7 clusters （λ= = 0. 8000）. The results of fuzzy duster analysis reflected that the seasonal differences of the population of cotton aphid and its predators in Chinese prickly ash orchard and the consanguineous correlation between the population temporal dynamics of cotton aphid and its predators.