东北林业大学帽儿山实验林场天然次生林的结构调整

通过在黑龙江省的东北林业大学帽儿山实验林场老爷岭生态站进行的抚育间伐实验，围绕人工经营对森林演替的影响问题进行了研究。结果表明，帽儿山地区天然次生林的演替正在陆续进入硬阔叶林阶段，林分质量逐渐提高，但也有一部分成过熟杨桦林，林分生产力不高，进展演替比较缓慢，有必要对这部分林分通过合理抚育，调整树种组成，促进演替进展，文中对适宜的抚育间伐强度进行了探讨，认为对杨桦林抚育不应采取高强度，否则不利于林分的演替。

Regulation of Structure for Natural Secondary Forest in Maoershan Experimental Forest Farm of Northeast Forestry University

The influence of management on forest succession was studied base on tending experiment in Laoyeling ecological station. The result showed that the natural secondary forest is entering the stage of hard broadleaf forest whose quality is becoming higher. However, there still exist some over-mature forest composed of pioneer tree species such as Betula platyphylla and Populus davidiana , whose productivity is low, and succession is slow. It is necessary to regulate composition of the stand and stimulate its succession by rational tending. The proper tending intensity was discussed, and it is suggested that intensive tending should be avoided, or it would limit succession of the stand.