食蚜绒螨和棉蚜的分布关系研究

A STUDY ON THE SPATIAL PATTERN OF ALLOTHROMBIUMSP.AND COTTON APHID

本文应用7个聚集度指标分析了食蚜绒螨、棉蚜有翅蚜和棉蚜无翅蚜在不同时期的种群空间格局,采用Fuzzy聚类分析法测定了空间格局动态,并用Weibull-Ⅰ型函数和David and Moore提出的比较两个总体聚集程度的方法,分析了食蚜绒螨和棉蚜在时间和数量上的配合,以及它们在空间格局上的差异,以此判断棉苗上的食蚜绒螨控制棉蚜的可能性,结果得出:(1)食蚜绒螨和棉蚜在发生时间和发生数量上具有同步性,田间寄生率符合Weibull-Ⅰ型分布;(2)食蚜绒螨和棉蚜有翅蚜的空间格局差异显著,与无翅蚜差异不显著;(3)聚集指标测定得出,食蚜绒螨和棉蚜无翅蚜的空间格局为聚集型,有翅蚜为随机型;(4)聚类分析得出,被寄生有翅蚜有2d周期变化;食蚜绒螨聚集性在前期与有翅蚜相似,在后期与无翅蚜相似;提出了天敌控制的连接问题。

Seven aggregation indices were used to analyze the spatial pattern of the red velvet mite(Allothrombium sp)and cotton aphid(Aphis gossypii G.)in different stages.The pattern dynamics were tested by fuzzy clustering method. Weibull-I distribution and David and Moore's method were used to analyze similarity of the mite and the aphid in time and number, and difference of their spatial pattern.The results showed that.(1)The mite and the aphid had synchronism in time and number.Under the field conditions,the dynamics of parasiting percentage conform to Wei-bull- I distribution.(2)The patterns of the mite and the alatus aphids were apparently different, while the mite and the apterous aphid's were not apparently different,,(3)The aggregation indices were tested,the results showed that the patterns of the mite and the apterous aphids were aggregate, and alatus aphid's were random.(4) The results from the fuzzy clustering analysis were that the parasited alatus aphids had two day's period,The aggregate of the mite and the alatus aphids were similar in early stages,and the apterous aphid's in late stages, and the questions about the natural enemy controlling connection were asked.