朝阳地区不同类型油松林对松毛虫的自然防控力研究

Natural Control Ability of Pinus tabulaeformis in Different Types of Pinus tabulaeformis Forest in Chaoyang Area

对朝阳地区油松人工纯林、油松+刺槐混交林及油松+蒙古栎混交林等不同类型林分中松毛虫发生情况进行了调查分析,并对越冬幼虫的虫口密度动态进行了监测。结果表明:在朝阳地区的松毛虫发生区,混交林对松毛虫的自然控制能力明显高于油松纯林。其中油松+刺槐混交林的有虫株率和虫口密度比油松纯林分别减少38.0%和74.8%;油松+蒙古栎混交林的有虫株率和虫口密度比油松纯林分别减少43.9%和80.8%,3种油松林分对松毛虫的自然控制能力顺序为油松+蒙古栎混交林>油松+刺槐混交林>油松人工纯林。

The occurrence of pine caterpillars in different stand types among the artificial pure forest of Pinus tabuliformis,the mixed forest of Pinus tabulaeformis ＋ Robinia pseudoacacia,the mixed forest of Pinus tabuliformis＋ Quercus mongolicain Chaoyang area was analyzed,and the dynamics of the insect mouth density of the overwintering larvae was monitored.The results showed that the natural control ability of mixed forestland in the occurrence area of red pine caterpillar in Chaoyang area is higher than that of Pinus tabulaeformis pure forest,and the rate of strain and density of insect mouth in the mixed forest of Pinus tabulaeformis and Robinia pseudoacacia decreased by38% and 74.8%,respectively,and the yield and density of Quercus mongolica mixed forest were more pure than that of Pinus tabulaeformis.The natural control ability of the three species of Pinus caterpillar is 43.9% 80.8%,respectively.The order of the natural control ability of three kinds of Pinus caterpillars is the mixed forest of Pinus tabulaeformis ＋ Quercus mongolica the mixed forest of Pinus tabulaeformis ＋ Robinia pseudoacacia artificial pure forest of Pinus tabulaeformis.