中文摘要：

阔叶红松林是我国东北东部山区的地带性植被，长白山区是阔叶红松林的核心分布区．由于人类活动的干扰，目前天然阔叶红松林只在长白山和小兴安岭地区残留了一些面积不等的片段．为比较分析阔叶红松林在不同分布区的异同，以广义长白山区阔叶红松林残留片段为研究对象，依照巴拿马BarroColoradoIsland（BCI）50hm^2热带雨林样地的技术规范，于2012年在吉林长白山自然保护区和辽宁东部山区阔叶红松林残留片段分别建立了3个固定样地，对6个样地内胸径≥1cm的木本植物进行定位调查．结果表明：6个样地共记录到木本植物69种，隶属于24科42属，其中槭树科为6个样地物种最丰富的科，区系组成均以北温带成分为主，同时混有亚热带成分；从物种多度、平均胸径、胸高断面积和重要值看，各样地优势种明显；6个样地所有独立个体的径级结构均呈倒“J”型，但各样地不同径级个体比例有很大差异，表明6个样地群落处于不同的演替阶段．各样地中重要值位于前3位物种的径级结构可分为倒“J”型、“L”型、单峰型和偏峰型4种类型；各样地主要树种随物种、径级的变化呈现出不同的空间分布格局，同一物种在不同样地的分布格局也表现出一定的差异．

英文摘要：

The broadleaved Korean pine mixed forest represents the typical vegetation type of the eastern mountain area in Northeast China. However, due to the interference of human activities, the natural broadleaved Korean pine forest only distributes in some residual fragments with unequal areas in Changbai Mountains and Small Hinggan Mountains. To compare and analyze the similarities and differences of broadleaved Korean pine mixed forests in the different areas, we established six forest plots following the field protocol of the 50 hm2 forest plot in Panama （ Barro Colorado Island, BCI） in 2012 in Changbai Mountain National Nature Reserve in Jilin Province and the eastern mountain area in Liaoning Province. All freestanding plant species with DBH （diameter at breast height） ≥ 1 cm were mapped, tagged and identified to species. The results showed that there were 69 woody species in the six plots, comprising 42 genera and 24 families. Aeeraceae was the most speciesrich family in all six plots. Most species belonged to the plant type of North Temperate Zone, with a minor subtropical plant species component. The statistics of species abundance, basal area, mean DBH, and importance value showed that there were obviously dominant species in eachcommunity. The DBH distribution of all individuals showed a reversed ＂J＂ type. However, the percentage of individuals in small sizeclass and large sizeclass varied in the six communities, which indicated that these communities were at different successional stages. Ranked by the importance value, the DBH distribution of the top three species in the six plots showed four distribution types： reversed ＂J＂ distribution, reversed ＂L＂ distribution, unimodal distribution, and partial peak distribution. Spatial distribution patterns of the main species in the six plots changed differently with spe cies and sizeclass, and the distribution patterns of the same species varied in the different plots.community. The DBH distribution of all individuals showed a reversed ＂J?