亚热带森林植物的叶片和根系功能性状部分耦合但具有不同的群落性状分布格局

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中文摘要：植物的生态过程依赖于叶片和根系的功能运行,但少有研究同时关注这两类性状在群落中的分布格局(CTD).本文测定了广东亚热带森林44种共生木本植物的16个叶片和根系性状,旨在检验类比的叶片和根系性状是否耦合,是否沿类似的功能性状谱变异,是否表现出类似的CTD,其CTD和群落加权平均性状值(CWM)是否沿环境梯度表现出类似的响应.研究结果表明,叶片和根系性状变异的第一轴均呈显出由资源获取向资源保守变异的经济学谱,但叶片变异的第二轴主要由叶片碳含量表征,而根系变异的第二轴主要由反映菌根协作程度的根系粗细表征.类比的叶片和根系化学性状整体正相关,但形态性状的耦合程度较低.在群落水平上,叶片和根系性状第一轴的CWM均随海拔升高而变得更保守,而第二轴的变化则不一致.随土壤磷含量的降低或钾含量的升高,根系变得更细和在养分性状上更保守,而叶片性状无显著变化.当整合多维性状轴时,叶片性状呈发散格局,且随海拔、土壤磷和钾含量的增加呈收敛趋势;而根系性状呈收敛格局,但沿上述环境梯度呈发散趋势.该研究强调,叶片和根系性状与环境互作的差异可能导致不同的性状分布格局;植物可通过多样的地上和地下功能设计应对环境异质性.

外文标题：Leaf and root traits are partially coordinated but they show contrasting multi-trait-based community trait dispersion patterns in a subtropical forest

外文摘要：The ecology of plant species relies on the synchronous functioning of leaves and roots,but few studies have simultaneously examined the community trait dispersion(CTD)patterns of both organs.We measured 16 analogous leaf and root traits on 44 co-occurring woody species in a subtropical forest in southern China,aiming to examine whether leaf and root traits were coordinated,organized into parallel trait axes,exhibited similar CTD,and displayed consistent responses in CTD and community-weighted means of(CWM)traits over environmental gradients.While the first axes of leaf and root trait variation similarly exhibited a fast-slow continuum,leaf traits covered a secondary"carbon economics"axis,contrasting to root traits depicting a collaboration axis reflecting species'mycorrhizal dependency.Analogous leaf and root chemical traits were generally coordinated but less so for morphological traits.At the community level,changes in the CWM of the first axes were generally consistent among organs with more conservative traits found as increasing elevation but not for the second axis.While root traits became thinner and more conservative as soil phosphorus concentration decreased,leaf traits rarely varied.When different trait axes were combined,leaf traits were overdispersed but tended to converge with increased elevation and soil potassium and phosphorus levels,whereas root traits were clustered but tended to diverge along the same gradients.Our study highlights fine filtering of different suites of traits above-and belowground,which in turn might reduce overall niche overlap among species and promote coexistence with diverse functional designs.

外文关键词：

functional dimensionscommunity assemblyleaf traitsroot traitsplant fast-slow spectrumcommunity trait structuresubtropical forest

作者：

Wenqi Luo、Oscar J. Valverde-Barrantes、Monique Weemstra、James F.Cahill Jr、Zi Wang、Dong He、Yongfa Chen、Chengjin Chu、Youshi Wang

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作者单位：

State Key Laboratory of Biocontrol,School of Life Sciences/School of Ecology,Sun Yat-sen University,Guangzhou 510275,China

International Center for Tropical Botany,Department of Biological Sciences,Florida International University,Miami,FL 33199,USA

Department of Biological Sciences,University of Alberta,Edmonton,AB,T6G 2E9,Canada

School of Ecology and the Environment,Xinjiang University,Urumqi 830046,China

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关键词：

性状维度群落构建叶片性状根系性状植物经济谱群落性状结构亚热带森林

基金：

国家自然科学基金国家自然科学基金中国博士后科学基金Guangdong Basic and Applied Basic Research Foundation

项目编号：

31925027323013412021M7037562021A1515110362

出版年：

2024

DOI：

10.1093/jpe/rtad045

植物生态学报(英文版)

ISSN：1752-9921

年,卷(期)：2024.(1)

参考文献量71