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species abundance is jointly determined by functional traits and negative density dependence in a subtropical forest in southern China

引用

Journal of Plant Ecology 2021年第3期14卷 491-503页

作者： Weitao Wang Yun Jiang Buhang Li Nianxun Xi Yongfa Chen Dong He Jiayi Feng Chengjin Chu Department of Ecology State Key Laboratory of BiocontrolSchool of Life SciencesSun Yat-sen UniversityGuangzhou 510275China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Aims The factors affecting species abundance are a subject of ongoing debates in community *** studies have demonstrated that tree abundance is affected by plant functional traits and negative density dependence(NDD).However,few studies have focused on the combined effects of NDD and plant functional traits on species *** In this study,we used tree functional traits and two census data from a 50-ha forest dynamic plot in the Heishiding(HSD)Nature Reserve to explore the combined effects of functional traits and NDD on species *** hierarchical Bayesian models,we analyzed how neighbor densities affected the survival of saplings from 130 species and extracted posterior means of the coefficients to represent *** structural equation modeling(SEM)analysis was then applied to investigate the causal relationships among species functional traits,NDD and species *** Findings SEM showed that tree functional traits,including specific leaf area(SLA),leaf area(LA),leaf dry matter content(LDMC),leaf N content(LNC),maximum electron transport rate(ETRmax)and conspecific adult negative density dependence(CNDDadult),together explained 20%of the total variation in tree ***,SLA affected tree abundance both directly and indirectly via CNDDadult,with a totally negative influence on *** and LNC had only indirect effects mediated by CNDDadult on tree *** and LA had directly negative effects on abundance,but their direct connections with CNDDaduIt were not *** addition,CNDDadult was negatively correlated with species abundance,indicating that abundant species are under stronger *** these investigated traits,SLA contributed the most to the variation in CNDDaduIt and *** argued that our findings of trait-CNDDadult-abundance relationships can improve our understanding of the determinants of species commonness and rarity in forests.

关键词： tree abundance negative density dependence functional traits common species rare species

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