摘要
1987～1988年,对湖南省洞口县马尾松毛虫种群密度及天敌寄生情况进行调查,发现寄生性天敌昆虫27种,重寄生者14种。据此,构造了松毛虫—寄生者系统食物网及营养级数量金字塔,对系统的稳定性进行初步分析表明,各代松毛虫的寄生天敌种类和寄生率均存在着差异。寄生率以第2代为最高;害虫种群变动趋势与天敌种类有关;寄生数量与寄主密度成正比;赤眼蜂、平腹小蜂的寄生率与卵块密度呈微弱负相关或无关,卵总寄生率与卵块密度呈轻微负相关,幼虫和蛹的寄生率与寄主密度无关。
The population density and parasitism of Dendrolimus punctatus Walkerwere investigated from 1987 to 1988 in Dongkou County of HunanProvince. 27 species of parasitic enemies and 14 species of secondaryparasitoids were found. The food web and the numerical pyramid of thehost-parasitoids system were constructed and the stability of the systemwas analysed. It was found that the number of species of parasitoids andparasitism rate varied with generations, with the highest patasitism rateoccurring in the second generation. Dynamics of the pest population wasrelated to the number of species of parasitoids. The percentage of hostsparasitized increased with the host density. The parasitism of Trichogrammadendrolimi and Anastatus aibitasis is faintly reversely density dependent orindependent at egg cluster densities. The total parasitism in egg periodisslightly reversely density dependent at egg cluster densities. The parasitismin larva and pupa period is density independent at host densities.
出处
《中南林学院学报》
CSCD
1989年第2期185-193,共9页
Journal of Central South Forestry University
关键词
马尾松
毛虫
寄主
天敌
食物网
Dendrolimus punctatus Walker
parasitic enemy
food web
density dependence
