安徽淮北棉田捕食性天敌群落的动态分类

在对安徽省淮北棉田捕食性天敌群落进行系统调查的基础上，采用极点排序和模糊聚类分析方法，研究了棉田捕食性天敌群落的动态分类；采用主成分分析方法。研究了棉田捕食性天敌群落在棉花生长发育过程中演变的主要阶段。结果表明，棉田捕食性天敌群落的时序动态可以分为7种类型；演变可以分为形成和发展阶段（棉花营养生长期）、鼎盛阶段（棉花营养生长和生殖生长并进期）、衰退阶段（棉花生殖生长期）3个主要阶段。研究结果为科学制订棉花不同生育期害虫防治策略和综合治理措施提供了重要依据。

Studies on the dynamic classification of predatory natural enemy community in cotton fields to the North of the Huaihe River of Anhui Province

Based on a systematic investigation on the predatory natural enemy community in cotton fields to the North of the Huaihe River of Anhui Province,the methods of polar ordination(PO)and fuzzy cluster analysis(FCA)were employed to study the dynamic classification of predatory natural enemy community in cotton fields and the method of principal component analysis(PCA)was employed to study the major stages of change of predatory enemy community in cotton fields during the process of cotton growth and development.The results showed that the temporal dynamics of predatory natural enemy community in cotton fields could be classified into seven types and the change of the community could be divided into three major stages of formation and development period(in the vegetative growth stage of cotton),great prosperity period(in the vegetative and reproductive growth stage of cotton)and decline period(in the reproductive growth stage of cotton).The results should provide important scientific basis for formulizing insect pest control strategies and integrated pest management methods to different growth and development stages of cotton.