角倍蚜干母种群的空间格局及其形成机理研究

Spatial patterns of stem-mother of Schlechtendalia chinensis (Bell) and their form principle (Homoptera: Pemphigidae)

对角倍蚜 Ｓｃｈｌｅｃｈｔｅｎｄａｌｉａ ｃｈｉｎｅｎｓｉｓ （ Ｂｅｌｌ）干母种群的空间格局及其形成机理的研究表明，角倍蚜干母种群在倍林间呈聚集分布，导致其聚集分布的原因是角倍蚜本身的聚集行为和盐肤木 Ｒｈｕｓ ｃｈｉｎｅｎｓｉｓ Ｍｉｌｌ复叶生长状况的异质性两个方面：角倍蚜干母种群分布的基本成分是疏松个体群，个体群的大小为３－ ６ 株倍树所占的面积（２．３－ ４．６ ｍ ２）；当样方大小为１、３、６ 株时为聚集分布，大于６ 株时为均匀分布。

Spatial pattems of stem-mother of horned gall aphid Schlechtendalia chinensis (Bell) are analyzed by means of aggregation indices and regression equation methods. The results showed that the stem-mother of S. chinensis (Bell) is of the aggregation pattern, which was affected by the area of sampling plot. The basic component of population distribution occurs as loose clonies and its size was 3-6 plants (2.3-4.6 m 2). The less density there is, the more aggregative. The reasons for aggregation may be due both to active aggregation of stem-mother itself and to various development case of the sumac Rhus chinensis Mill.