亚热带森林中树木大小可调控功能性状与存活率之间的关系  

Relationships between functional traits and survival mediated by tree size in subtropical forests

作　　者：Zhen-Yu Wang Zhi-Qun Huang 

机构地区：[1]Key Laboratory of Humid Subtropical Eco-Geographical Process of Ministry of Education,Fujian Normal University,Fuzhou 350007,China [2]School of Geographical Science,Fujian Normal University,Fuzhou 350007,China

出　　处：《Journal of Plant Ecology》2024年第3期63-72,共10页植物生态学报（英文版）

基　　金：the National Natural Science Foundation of China(31930077).

摘　　要：使用功能性状来预测植物的存活率是生态学研究中的一个挑战。然而,由于对根系性状的研究较少,根系和叶片性状与树木存活率的一致性尚不确定。此外,植物性状与存活率之间的关系通常是非线性的,并且可能会随着树木大小的变化而变化。本研究整合了在亚热带纯林中生长的32个常见树种共17901棵树的存活率数据,以检验根系和叶片性状与树木存活率的一致性,以及这些性状与存活率之间的关系如何随树木地径大小的变化而变化。结果发现,叶片和根系性状对树木存活率的影响并不一致。具体而言,代表获取策略的比叶面积对存活率有边际显著的负影响,而在一维根经济谱中代表保守策略的根直径也对存活率有显著的负影响。此外,性状与树木存活率之间的关系受到树木大小的调控。比叶面积、叶磷浓度和比根长对存活率的影响随着树木大小的增加由负转正。然而,叶厚度和根直径仅对地径较小的树木的存活率有正效应。上述结果表明,若要准确预测植物性状与存活率的关系,需同时考虑地上和地下性状,以及调控这种关系的树木大小信息。An important challenge in ecology is to link functional traits to plant survival for generalizable predictions of plant demographical dynamics.However,whether root and leaf traits are consistently associated with tree survival remains uncertain because of the limited representation of root traits.Moreover,the relationships between plant traits and survival are rarely linear and are likely to vary with tree size.We analyzed demographic data from 17901 trees of 32 subtropical tree species under 3-year-old monocultures to test whether root and leaf traits have consistent relationships with tree survival and how the relationships between traits and tree survival vary with tree diameter.We discovered that leaf and root traits have inconsistent effects on tree survival.Specifcally,while specifc leaf area(SLA;an acquisition strategy)showed a marginally signifcant negative impact on survival,root diameter(RD;a conservative trait within the one-dimensional root economic spectrum)also demonstrated a signifcant negative effect on survival.Furthermore,we found size-dependent relationships between traits and tree survival.The effect of SLA,leaf phosphorus concentration and specifc root length,on survival shifted from negative to positive with increasing tree size.However,species with high leaf thickness and RD were positively linked to survival only for small trees.The results highlight that to accurately predict the relationships between traits and tree survival,it is essential to consider both above-and belowground traits,as well as the size-dependent relationships between traits and tree survival.

关 键 词：森林动态 多维性 植物表现 植物策略 根系经济谱 

分 类 号：Q94[生物学—植物学]