首页|Disparities in tree mortality among plant functional types(PFTs)in a temperate forest:Insights into size-dependent and PFT-specific patterns

Disparities in tree mortality among plant functional types(PFTs)in a temperate forest:Insights into size-dependent and PFT-specific patterns

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Tree mortality significantly influences forest structure and function,yet our understanding of its dynamic patterns among a range of tree sizes and among different plant functional types(PFTs)remains incomplete.This study analysed size-dependent tree mortality in a temperate forest,encompassing 46 tree species and 32,565 individuals across different PFTs(i.e.,evergreen conifer vs.deciduous broadleaf species,shade-tolerant vs.shade-intolerant species).By employing all-subset regression procedures and logistic generalized linear mixed-effects models,we identified distinct mortality patterns influenced by biotic and abiotic factors.Our results showed a stable mor-tality pattern in evergreen conifer species,contrasted by a declining pattern in deciduous broadleaf and shade-tolerant,as well as shade-intolerant species,across size classes.The contribution to tree mortality of evergreen conifer species shifted from abiotic to biotic factors with increasing size,while the mortality of deciduous broadleaf species was mainly influenced by biotic factors,such as initial diameter at breast height(DBH)and conspecific negative density.For shade-tolerant species,the mortality of small individuals was mainly determined by initial DBH and conspecific negative density dependence,whereas the mortality of large individuals was subjected to the combined effect of biotic(competition from neighbours)and abiotic factors(i.e.,convexity and pH).As for shade-intolerant species,competition from neighbours was found to be the main driver of tree mortality throughout their growth stages.Thus,these insights enhance our understanding of forest dynamics by revealing the size-dependent and PFT-specific tree mortality patterns,which may inform strategies for main-taining forest diversity and resilience in temperate forest ecosystems.

Size-dependent tree mortalityPlant functional typeNeighbourhood competitionTopography variablesSoil properties

Man Hu、Hang Shi、Rui He、Bingbin Wen、Haikun Liu、Kerong Zhang、Xiao Shu、Haishan Dang、Quanfa Zhang

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Key Laboratory of Aquatic Botany and Watershed Ecology,Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China

Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station,Chinese Academy of Sciences & Hubei Province,Wuhan 430074,China

University of Chinese Academy of Sciences,Beijing 100049,China

Forest & Nature Lab,Department of Environment,Ghent University,Geraardsbergsesteenweg 267,Melle-Gontrode,9090,Belgium

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China Postdoctoral Science FoundationNational Natural Science Foundation of China

2023M73371231971491

2024

10.1016/j.fecs.2024.100208

森林生态系统(英文版)
北京林业大学

森林生态系统(英文版)

CSTPCD
影响因子：0.09
ISSN：2095-6355
年,卷(期)：2024.11(4)