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

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

机构地区：[1]Key Laboratory of Aquatic Botany and Watershed Ecology,Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China [2]Danjiangkou Wetland Ecosystem Field Scientific Observation and Research Station,Chinese Academy of Sciences&Hubei Province,Wuhan 430074,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Forest&Nature Lab,Department of Environment,Ghent University,Geraardsbergsesteenweg 267,Melle-Gontrode,9090,Belgium

出　　处：《Forest Ecosystems》2024年第4期480-490,共11页森林生态系统（英文版）

基　　金：supported by the China Postdoctoral Science Foundation (No.2023M733712);the National Natural Science Foundation of China (No.31971491)。

摘　　要：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 mortality patte rn in eve rgreen conifer species,contrasted by a declining pattern in deciduous broadleaf and shadetolerant,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 maintaining forest diversity and resilience in temperate forest ecosystems.

关 键 词：Size-dependent tree mortality Plant functional type Neighbourhood competition Topography variables Soil properties 

分 类 号：S718.5[农业科学—林学]