天然次生针叶林蛀干害虫大发生原因

Study on the Cause of Trunk Bore's Spreading Occurrence to the Secondary Coniferous Forest

在吉林省延边地区蛀干害虫严重威胁着针叶林生长,并有逐步扩展的趋势。采用踏查和解析木调查的方法,对针叶林蛀干害虫的种类、危害情况及特点进行了调查,并对其发生原因做了初步分析。

Trunk borer has threatened the coniferous forest seriously. Trees have been damaged in a scale somewhere, and the disaster is exending gradually. By the means of general and anatomic tree investigation, the species, harm case and characteristic of trunk borer are studied. And the reason for the trunk borer＇s occurring is analyzed.