格氏栲天然林林窗植物物种多样性与系统发育多样性  

Taxonomic and phylogenetic diversity of plants in a Castanopsis kawakamii natural forest

作　　者：陈博 江蓝[1,2,3] 谢子扬 李阳娣 李佳萱 李梦佳 魏晨思 邢聪 刘金福 何中声[1,2,3] Bo Chen;Lan Jiang;Ziyang Xie;Yangdi Li;Jiaxuan Li;Mengjia Li;Chensi Wei;Cong Xing;Jinfu Liu;Zhongsheng He(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002;Cross-Strait Nature Reserve Research Center,Fujian Agriculture and Forestry University,Fuzhou 350002;Key Laboratory of Fujian Universities for Ecology and Resource Statistics,Fuzhou 350002)

机构地区：[1]福建农林大学林学院,福州350002 [2]福建农林大学海峡自然保护区研究中心,福州350002 [3]生态与资源统计福建省高校重点实验室,福州350002

出　　处：《生物多样性》2021年第4期439-448,共10页Biodiversity Science

基　　金：国家自然科学基金(31700550;31770678);福建省自然科学基金(2019J01367);福建省林业科技推广项目(2018TG14-2);福建农林大学科技创新基金(CXZX2018125)。

摘　　要：林窗环境异质性导致群落物种多样性与系统发育多样性(phylogeneticdiversity,PD)存在差异,研究不同大小的林窗中群落的物种多样性与系统发育多样性有助于揭示林下生物多样性的形成及维持机制。本文以格氏栲(Castanopsiskawakamii)天然林为研究对象,通过Pearson相关性分析与广义线性模型探讨了林窗内物种多样性与系统发育多样性间的相互关系及其环境影响因素。结果表明:(1)大林窗(面积>200 m^(2))植物种类及多度均高于中林窗(50 m^(2)≤面积<100 m^(2))、小林窗(30 m^(2)≤面积<50 m^(2))和非林窗(面积=100 m^(2))。大林窗群落系统发育结构趋于发散,中、小林窗和非林窗群落系统发育结构受到生境过滤和竞争排斥综合作用。(2)群落系统发育多样性指数与物种丰富度(speciesrichness,SR)、Margalef丰富度指数和Shannon-Wiener指数均呈显著正相关,这与林窗内稀有种种类组成多于优势种有关。(3)林窗面积对物种多样性存在显著正效应;土壤全氮含量对系统发育多样性和系统发育结构存在显著正效应。林窗形成提高了格氏栲天然林群落物种多样性和系统发育多样性,林窗面积与土壤全氮共同驱动了格氏栲天然林林窗物种多样性和系统发育多样性的变化。Aims:Environmental heterogeneity of forest gaps leads to variation in taxonomic and phylogenetic diversity of trees in these areas.Studying tree diversity in different sizes of forest gap communities can help to reveal the mechanisms that drive the formation and maintenance of biodiversity.This study took Castanopsis kawakamii gaps as the research object,and aimed to reveal the relationship between the taxonomic and phylogenetic diversity of plants and its environmental influence factors.Methods:We examined different sizes of forest gaps in a Castanopsis kawakamii natural forest as to study the taxonomic and phylogenetic diversity of plants,and used a generalized linear model(GLM)to explore the environmental factors driving the community assembly.Results:We found that the plant species and plant abundance in large gaps(>200 m^(2))were higher than those of medium gaps([50 m^(2),100 m^(2))),small gaps([30 m^(2),50 m^(2)))and non-gaps(100 m^(2)).The phylogenetic community structure of the large gaps tends to diverge,while that of the medium gaps,small gaps and non-gaps were affected by the combined effect of habitat filtering and competitive exclusion.The phylogenetic community diversity index(PD)was significantly positively correlated with species richness(SR),Margalef index and Shannon-Wiener index,which is related to the higher species composition of sparse species than dense species in forest gaps.Overall,forest gap size had a significantly positive effect on species diversity,and the soil total nitrogen content had a significantly positive effect on community phylogenetic diversity and phylogenetic structure.Conclusion:The formation of forest gaps increase the taxonomic and phylogenetic diversity of trees in natural forests,with gap size and soil total nitrogen jointly driving tree diversity in these natural forest gaps.

关 键 词：格氏栲 林窗 物种多样性 系统发育多样性 环境因素 

分 类 号：Q948[生物学—植物学]