肚倍蚜越冬种群空间格局及抽样技术研究

调查结果表明，肚倍蚜（ＫｕｂｕｒａｇｉａｒｈｕｓｉｃｏｌａＴａｋａｇｉ）越冬种群在自然气候室内不同层次、方向的越冬寄主上的分布无本质差异，空间格局符合“复合波松”等理论分布型，由三重疏松个体群组成，个体群面积分别为２８，２０个和１２ｃｍ￣２，个体群平均有虫３．８４５３头，在此基础上建立了理论抽样模型。抽样方法比较结果以五点取样，每点在相邻两层冬寄主上取样１０个（×４ｃｍ￣２）代表性最好。

Spatial Distribution Pattern and Sampling Techniques of Gallnut Aphid (Kuburagia rhusicola Takagi) Overwintering Population

This paper deals with the spatial distribution pattern and sampling techniques of the gallnut aphid,Kuburagia rhusicola Takagi overwintering population.The investigatory and experimental results show that the average densities of the population at different layers and orientations have no statistical difference in the natural climatic laboratory.The spatial distribution pattern is in agreement with complex Poisson distribution.The distribution consists of three individual groups.The areas of large,medium and small groups average 28,20,and 12cm² respectively with the average aphid member of 3.8453 in each group,on which the theoretical sampling model is set up.The result of the comparasion among the sampling methods shows that the 5 plot sampling method,taking 10 (4cm²)samples from winter hosts at two adjacent layers at each spot,has the best representation for the population.