Tree species composition and community structure of the arbor layer of three types of natural secondary forests in Changbai mountain area
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
NSTL
万方数据
