阔叶红松林林冠斑块特征及其与林木更新的关系

调查了长白山北坡海拔740m处阔叶红松林主要树种林冠斑块的特征，及其对林分结构与更新的影响，结果表明，林冠斑块主要由红松，椴树，色木，蒙古栎4个树种组成，其林冠斑块覆盖面积占林地面积的57．1％，占样地内林冠斑块总面积的87％，其中以红松和紫椴林冠为主，小林冠斑块数量多，分布广，大斑块则很少，林冠斑块面积基本在100m^2以上，只有个别的斑块超过100m^2，林冠斑块形状变异较大，呈现不规则的多边形，林冠树种对幼龄个体的分布存在一定的影响，色木槭幼龄个体几乎分布在所有的紫椴和红松林冠斑块内，最大密度出现32m^2的紫椴林冠斑块和28m^2的红松林冠斑块内，紫椴的幼龄个体只集中在少数林冠斑块内。

Characteristics of canopy patches related to natural regeneration of broad-leaved Korean pine forest

The characteristics of canopy patches of dominant tree species in a broad leaved Korean pine forest at an elevation of 740 m in north slope of Changbai mountain was investigated to understand the effects of canopy patch on the structure and regeneration of the forest. The results showed that the main species that constituted the canopy patches were Pinus koraiensis,Tilia amurese,Acer mono and Quercus mongolica ,their canopy patches covered 57.1 % of the forest,and 87 % of the total area of the canopy. Most canopy patches were less than 100 m 2, with irregular shapes. The seedlings and saplings of Acer mono were distributed under almost all canopy patches of Tilia amurense and Pinus koraiensis ,and reached the maximum densities under canopy patch of Tilia amurense of 32 m 2,and patch of Pinus koraiensis of 28 m 2. However,the seedlings and saplings of Tilia amurense were distributed only under a few canopy patches of Tilia amurense and Pinus koraiensis .