Abstract:

The study investigated and analyzed the forest insect pests in forest regions in Daxing'anling, Heihe,Yichun and Mudanjiang in Heilongjiang Province of recent 5 years. The result shows that the dominating insect pests in the burned forests in Daxing'anling and Heihe regions are Anoplophora spp. And Ips spp.,the species of leaf eating insect pests are increasing in Yichun region, but harm slightly. Dendrolimus superans occurs badly in Mudanjiang region. Trunk worms happen badly in the burned forests, and there is positive relativity between burning intensity and insect pests occurring quantity. Trunk fumed height is an important factor that affects pests happening quantity. The linear relation between happening quantity of Anoplophora spp. And Ips spp. And trunk fumed height is obvious, the educed unitary linear regress equation makes sense. The relativity between insect pest happening quantity in Larix gmelinii, Pinus sylvestris var.mongolica, Betula platyphylla and trunk fumed height is strong, especially in the L. gmelinii, P. sylvestris var. mongolica.

Key words: forest pest, forest fire, relativity