论文部分内容阅读
一、前言马栏林场位于乔山林区南端,属于残败的天然林区,次生着山杨、栎类、桦木、油松等树种。油松在这里生长历史悠久,已成为当前和今后造林的主要先锋树种。由于是天然林区,所以害虫区系比较复杂。在某种适宜的自然环境条件下,一些害虫会猖獗起来。例如1982年以建庄油松梢小蠹为主的蛀干害虫突然大发生,面积达6.4万多亩,占油松林面积的50.5%,其中人工林发生面积4.2万多亩,占1956年建场以来营造油松林保存面积7.4万多亩的56.7%,使木材蓄积损失约4万米~3。小蠹虫在该林区为油松人工幼林的主要虫种,为了给综合防治提供可靠的依据,我们在马栏林区进行了建庄油松梢小蠹等蛀干害虫生活史与习性的观察。现将结果概述如下:
I. Introduction Wuling forest farm is located in the southern tip of Qiaoshan forest, belonging to the natural forest area, the second is the mountain poplar, oak, birch, pine and other tree species. Pinus tabulaeformis has a long history of growing here and has become a major pioneer tree species for current and future afforestation. Because it is a natural forest area, pest flora is more complicated. Under some suitable natural environment, some pests will rampant. For example, in 1982 the construction of Pinus taiwanensis mainly beetles pests suddenly occurred, covering an area of 6.4 hectares, accounting for 50.5% of Pinus tabulaeformis forest area, of which 42000 acres of plantations occurred, accounting for 1956 Since the field to create a conservation area of 74,000 acres of oil palm 56.7%, so that the loss of about 40,000 meters of timber 3 ~ 3. In order to provide a reliable basis for comprehensive prevention and control, Bark beetle is the main insect species in the Pinus tabulaeformis young plantation in this forest region. We observed the life history and habits of the borer pests such as Pinus tabulaeformis in Bailing Forest Region. . The results are summarized as follows: