摘要
本研究以青藏高原东缘亚高山地区岷江冷杉-桦木针阔混交林和岷江冷杉针叶林为对象,测定叶面积、叶厚度、叶干物质含量、比叶面积4种叶片功能性状,分析森林群落的物种多样性、功能多样性和系统发育多样性等多维度生物多样性特征及其相互关系.结果表明:针阔混交林的叶厚度(0.28 mm)和叶片干物质含量(319.86 mg·g-1)显著低于针叶林(分别为0.39 mm和371.33 mg·g-1),比叶面积(192.74 cm2·g-1)显著高于针叶林(100.91 cm2·g-1),而叶面积在2种森林群落中无显著差异(分别为27.88和26.63 cm2).除叶厚度外,其余3种叶片功能性状的系统发育信号均显著.针阔混交林和针叶林森林群落系统发育结构均趋于发散.针阔混交林的Shannon多样性指数、Simpson多样性指数、物种丰富度、功能丰富度、功能离散度、Rao二次熵、谱系多样性均显著高于针叶林,且这些指数之间均呈显著正相关.亚高山森林群落构建主要是竞争排斥起主导作用,且物种多样性、功能多样性和系统发育多样性具有同步性.
Abstract
We analyzed multidimensional biodiversity(including species diversity,functional diversity,and phylo-genetic diversity)of needle-broadleaf mixed forests of Abies fargesii var.faxoniana-Betula spp.and needleleaf for-ests of A.fargesii var.faxoniana in the subalpine regions of eastern edge of Qinghai-Tibet Plateau.We measured leaf functional traits including leaf area,leaf thickness,leaf dry matter content,and specific leaf area.The results showed that leaf thickness(0.28 mm)and leaf dry matter content(319.86 mg·g-1)in the needle-broadleaf mixed forests were significantly lower than in the needleleaf forest(0.39 mm and 371.33 mg·g-1,respectively),while specific leaf area(192.74 cm2·g-1)was significantly higher(100.91 cm2·g-1).Leaf area showed no significant difference between the two forest communities(27.88 and 26.63 cm2,respectively).The phylogenetic signals of all leaf functional traits were significant,except for leaf thickness.The phylogenetic structure of the needle-broadleaf mixed forests and needleleaf forest communities tended toward divergence.Shannon diversity index,Simpson diver-sity index,species richness,functional richness,functional dispersion,Rao's quadratic entropy,and phylogenetic diversity in the needle-broadleaf mixed forests were all significantly higher than in the needleleaf forest,and these indices were significantly positively correlated.Competitive exclusion played a major role in the assembly of subal-pine forest communities,and species diversity,functional diversity,and phylogenetic diversity exhibited synchrony.
基金项目
中央级公益性科研院所基本科研业务费专项资金项目(CAF-YBB2021ZA002-2)
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022SY021)
中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022QC002)
国家科技期刊平台
NSTL
万方数据