森林火灾在一定程度上能起到促进害虫猖獗发生和加剧树木枯死的作用。现以蛀干害虫为例,它常随着火灾的发生而引起暴发性的猖獗。这种现象与火灾的种类有关。一般在松林中发生地表火之后,因受上升热气流影响,树冠遭受损害较为突出。现以陕北林区两起森林火灾后的有关调查资料进行分析如下:栖居在立木上的虫口密度也大。(见表1)。 1965年3月,黄龙县圪台林场黄龙庙讲营林区大岔处,由荒火蔓延到油松幼林中,头8.2亩10余年生的幼林受到地表火的轻度灼伤,仅树皮和部分枝叶发生色变,无死亡 To a certain extent, forest fire can play a role in promoting rampant pests and exacerbating the dead trees. Take the example of pest-boring pests, which often causes the outbreak of rampancy as a result of a fire. This phenomenon is related to the type of fire. After the surface fire usually occurs in the pine forest, the damage to the canopy is more prominent due to the rising hot air current. Now two forest fires in northern Shaanxi forest after the investigation of the relevant information is as follows: dwelling habitat in the poplar density is also large. (See table 1). In March 1965, the Huangchamiao Huanglongmiao Forest Farm in Huanglong County spreads from the wildfire to the young pine forest. The young forest of the first 8.2 mu of 10-year-old is slightly burned by the surface fire and only the bark and Some foliage discoloration, no death