长白山北坡3个森林群落主要树种种间联结性

长白山是东亚大陆在我国境内唯一具有高山冻原的山地,分析长白山北坡3个群落乔木种的种间关联性尚未见报道。调查了长白山北坡海拔700—1700m的森林群落,根据调查资料,进行了TWINSPAN分类和种间联结性分析。结果表明:(1)35个样方被分为3个群落类型,即原始阔叶红松林、天然次生林和云冷杉林。34个树种被分为五类,第一类和第二类主要为阴性或中性偏阴性的硬阔叶树种,第三类和第四类主要为阳性或中性偏阳的软阔叶树种,第五类主要为针叶树种。(2)原始阔叶红松林建群种总体关联性呈不显著负相关,天然次生林和云冷杉林呈不显著正相关。(3)原始阔叶红松林、天然次生林和云冷杉林分别有89%、76%、47%的种对间关联程度紧密,植物群落稳定性与种间关系并非趋于正相关。

Analysis of interspecific associations among major tree species in three forest communities on the north slope of Changbai Mountain

Changbai Mountain has the only mountainous tundra habitat found in China. Interspecific associations among major tree species in three forestry communities on the north slope of Changbai Mountain have not yet been analyzed. In this study, we surveyed 35 quadrats in the three forest communities from 700 m to 1700 m of altitude, classified the samples using TWINSPAN, and analyzed for possible interspecific associations. The results show that (1) the 35 quadrats were divided into 3 different forest communities, a natural broad-leaved Korean pine forest, a natural secondary forest, and a spruce-fir forest. The 34 species were divided into 5 groups. The major trees species of the first and second groups were negative or neutral partial negative hard hardwood species. The major species of the third and fourth groups were positive or neutral partial Yang soft hardwood species. The fifth group was mainly composed of coniferous species. (3) Associations among major tree species in the natural broad-leaved Korean pine forest did not show any significant negative correlations, and no significant positive correlations were observed in the natural secondary forest and spruce-fir forest. (3) The percentage of closely correlated species pairs was 89%, 76%, and 47% for the natural broad-leaved Korean pine forest, natural secondary forest, and spruce-fir forest, respectively. Plant community stability and interspecies association did not tend to be positively correlated.