林火对森林虫害发生影响的研究

对黑龙江省的大兴安岭、黑河、伊春、牡丹江等林区近5年的火灾过火林地进行森林虫害调查分析.结果表明:大兴安岭及黑河林区森林过火后主要虫害为天牛和小蠹类;伊春林区食叶害虫种类较多,但危害较轻;牡丹江林区落叶松毛虫发生程度严重.森林火灾后林内蛀干害虫大量发生,树干熏黑高度是影响虫害发生数量的一个重要因子.火烧强度与虫害发生数量呈正相关性;天牛及小蠹类虫害发生数量与树干熏黑高度线性关系明显;兴安落叶松林、樟子松林、白桦林的虫害发生数量与树干熏黑高度相关性较高,兴安落叶松和樟子松林尤为明显.

Influence of fire on the occurrence of forest pest

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.