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在松阔混交林中,松毛虫的蛹期死亡率是纯林的1.62倍,松毛虫发生频次也明显低于纯林。究其机制,混交林比纯林植物种类多53种,密源植物多33种,林冠层多1～2层,而且覆被率高,温湿度稳定,利于其中两条食物链:土壤—松林—松毛虫—天敌和土壤—阔叶树—次要害虫—天敌的稳定循环,形成昆虫社会的相互依存,相互制约的平衡机制,抑制了松毛虫暴发成灾。
In the pine-broad-leaved mixed forest, the mortality of pine caterpillars was 1.62 times that of pure forests, and the frequency of pine caterpillars was also significantly lower than that of pure forests. The mechanism of mixed forest is more than pure forest species 53 kinds of dense source plants more than 33 species, canopy layer more than 1 or 2 layers, and the coverage rate is high, temperature and humidity stability, which will benefit the two food chains: soil - pine - Dendrolimus - natural enemies and soil - broadleaf - secondary pests - natural enemies of the cycle, the formation of insect society interdependence and mutual restraint of the balance mechanism, inhibit the outbreak of pine caterpillars.