关帝山天然次生华北落叶松林林下更新特征研究

华北落叶松(Larix principis-rupprechtii Mayr)林是华北地区典型的寒温性落叶针叶林。以华北落叶松林为研究对象,探讨其林下的更新组成、结构及格局特征,了解其更新规律。结果表明,林下针叶树更新幼树所占的比例随冠层密度的增大而增大,但随着林冠层密度的增大,华北落叶松更新幼苗的数量逐渐减少,而云杉更新幼苗逐渐增多。华北落叶松更新幼苗呈现相对简单的年龄结构,即以3 a生以下的幼苗为主,5 a生以上的幼苗很少(0～5%);总体上存在年龄结构的缺失现象,缺少幼苗到幼树的过渡阶段。

Study on Regeneration Characeristics under Canopy of Natural Secondary Larix principis-rupprechtii Mayr in Guandi Mountains

Larix principis-rupprechtii Mayr is a typical cold temperate deciduous coniferous forest.This paper chose Larix principis-rupprechtii as the research object,to study their regeneration under canopy,regeneration composition,age structure and pattern characteristic,and the regeneration regularity.The result showed that: with the increase of canopy density,seedling number of Larix principis-rupprechtii decreased gradually,but the Picea Spp.s’ increased;Larix principis-rupprechtii seedlings showed a relatively simple age strcture.Namely,seedlings under 3 years were dominant,while seedlings over 5 years a few(0～5%).Generally speaking,seedling age structure revealed an imperfection phenomenon on the whole,lacking a transitional stage from seedling to sapling.