祥云新松叶蜂茧空间格局的研究

祥云新松叶蜂(NeDdiP,l’o:石ang夕翻ic姗)是云、贵、川三省飞播云南松林区发生和危害严重的新害虫,有关其茧的空间格局尚未有过报道,作者于1988年在这方面作了研究,现将结果报道于下。

STUDY ON THE SPATIAL PATTERN OF COCOON OF NEODIPRION XIANGYUNICUS

This paper deals with the spatial pattern of cocoon of Neodip-rion xiangyunicus in the forest of Pinus yunnanesis. It was found that cocoons were distributed in the soil under crown projection. The pattern is an aggregated distribution. The fundamental unit is a single individual in the inte-rnal, internal inferor and outside layer of soil under crown projection. In the middle layer, the value of mean crowding for the distribution of the number of individuals per basic component is higher, the relative degree of aggregation in the distribution of basic component at low population densi-ties is the highest, and it decreases with the increase of population density. It is an aggregated distribution in all directions, the population density in the Orient is the highest, but it's lowest in the North, the degree of aggre-gation in the North is the highest, but it's lowest in the South.And in intertree, the pupal colonies are double colonies, the area of the small colony is about 10 m2 with 5 trees of P. yunnanensis and the area of big one is about 30 m2 with 15 trees. The small colony distributed uniformly among the bigger one, and the intertree spatial pattern of cocoon is random.