寄生性天敌对华山松大小蠹种群控制作用评价

Evaluation on control effect of parasitoids on Dendroctonus armandi population

对秦岭林区优势先锋虫种华山松大小蠹Dendroctonus armandi寄生蜂种群的林间分布规律进行了研究。在标准地调查基础上，选择华山松大小蠹虫害木作为解析木，分期分批采集华山松大小蠹幼虫和蛹进行室内饲养。结果表明：秦岭林区华山松大小蠹有寄生蜂7种。在河谷地带华山松林中寄生蜂种类最多，7种寄生蜂都有分布，总寄生率最高（37．5％-42．5％），其它依次为竹子华山松林、鹿蹄草华山松林、苔草华山松林、山坡下部华山松林；华山松虫害木树干不同部位寄生蜂种群组成和总寄生率不同，华山松大小蠹寄生蜂种群在华山松虫害木树干上的垂直分布与华山松大小蠹种群相吻合，说明华山松大小蠹种群和寄生蜂种群长期以来建立了相互制约而又相互依存的密切关系。

The distribution regularity of the population of wasps parasitizing Dendroctonus armandi in the Qinling Mountains was studied. The parasitoid larvae and pupae were collected from bark beetle galleries in different types of Pinus armandi stands and then brought to the laboratory to breed until they got mature and emerged. 7 species of parasitic wasps on Dendroctonus armandi were identified at last. The Pinus armandii communities in valley forest region had the most parasitic wasps and the highest parasitic rates（37.5%-42. 5 % ）. Others were Sinarundina nitida-Pinus armandii stands ,Pyrola rotundifolia-Pinus armandii stands, Carex montana-Pinus armandii stands, Pinus armandii stands on the lower slopes, pure Pinus armandii stands in sequence. The distribution of parasitic wasps on the standing tree of Pinus armandii was in accord with the distribution of Dendroctonus armandi. The populations of Dendroctonus armandi and their parasitic wasps had an intimate long-term interdepen dent and mutual restrictive relationship.