The Changbai Mountains region is one of the most biologically diverse areas in northeastern China.To gain a comprehensive understanding of the species composition and community structure across different forest types in this region,our study strategically established 71 plots,each covering an area of 0.1 hm2,utilizing a satellite network for sampling.These plots were categorized into three main forest types:mixed broad-leaved forest,mixed coniferous and broad-leaved forest,and Quercus mongolica pure forest.Our analysis revealed a rich diversity of species comprising 48 species from 13 families and 28 genera.Notably,the flora of the region exhibited a distribution pattern characterized by north temperate and a discontinuity between the southern and northern temperate zones.Key tree species,such as Tilia amurensis,Acer mono,Ulmus pumila,Betula platyphylla and Quercus mongolica,all demonstrated high importance values＞5.Furthermore,the diameter class distribution of individual trees within each plot followed a reverse"J"pattern,indicative of a typical uneven-aged forest structure,contributing to overall forest stability.Analysis of species diversity within the three primary forest types revealed that the coniferous and broad-leaved mixed forest exhibited the highest overall species diversity,followed by the broad-leaved mixed forest and Quercus mongolica pure forest.Specifically,the Shannon-Wiener,Simpson,and Pielou indices underscored the superior richness of the coniferous and broad-leaved mixed forest,with values of 3.093,0.942,and 0.856,respectively.This highlights the region's remarkable forest structure,characterized by a high degree of species diversity and richness.However,it remains in the process of ecological succession towards a stable climax community state.
species compositioncommunity structurenatural secondary forestChangbai mountain area
NETL
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万方数据
