A study was performed to analyze species composition and spatial distribution of tree seedlings based on a permanent plot in Korean pine broadleaved forest in Changbai Mountains as well as field surveys of seedlings and adult trees in the plot. The relationship between mature trees and seedlings was further assessed. Results showed that a total of 1 802 trees were recorded in this plot, among which there were 9 332 tree seedlings. The numbers of Fraxinus mandshurica, Tilia amurensis, Acer mono, A. Tegmentosum, A. Ukurunduensi, A. Pseudo-sieboldianum, A. Barbinerve, Pinus koraiensis, Quercus mongolica, and Maackia amurensis seedlings were 6 986, 832, 394, 250, 123, 289, 438, 3, 10, and 7, respectively. Seedlings of dominate tree species were characterized by clumped distribution on the scales less than certain critical points. When the scales were enlarged beyond these points, seedlings were randomly dispersed. Analysis of spatial relationship showed an unobvious correlation between seedlings of dominate tree species and their mature trees.%以长白山阔叶红松林永久样地为平台,基于该群落幼苗、大树的调查数据,对乔木树种幼苗组成进行初步分析,并运用点格局分析法,对群落中幼苗及幼苗与大树相关关系进行研究.结果表明:该群落物种组成较丰富,共调查到乔木树种大树1 802株,隶属于20种,幼苗9332株,隶属于10种,这些幼苗也是样地内主要乔木树种的组成成分.在1 hm2样地内,共调查到水曲柳(Fraxinus mandshurica)幼苗6 986株,紫椴(Tilia amurensis)幼苗832株,色木槭(Acer mono)幼苗394株,青楷械(Acer tegmentosum)幼苗250株,花楷械(Acer ukurunduensis)幼苗123株,假色槭(Acer pseudo-sieboldianum)幼苗289株,簇毛槭(Acer barbinerve)幼苗438株,红松(Pinus koraiensis)幼苗3株,蒙古栎(Quercus mongolica)幼苗10株,怀槐(Maackia amurensis)幼苗7株.从幼苗的空间分布格局来看,优势树种幼苗在小尺度上呈现聚集分布,随着尺度的增大而逐渐趋于随机分布.从幼苗与成树相关关系来看,优势树种的幼苗与大树未表现出显著的相关性.
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