Speciesα-diversity promotes butβ-diversity restricts aboveground biomass in tropical forests,depending on stand structure and environmental factors  

作　　者：Umar Aftab Abbasi Eskil Mattsson Sarath Premalal Nissanka Arshad Ali 

机构地区：[1]Forest Ecology Research Group,College of Life Sciences,Hebei University,Baoding 071002,People’s Republic of China [2]IVL Swedish Environmental Research Institute,Aschebergsgatan 44,41133 Gothenburg,Sweden [3]Gothenburg Global Biodiversity Centre(GGBC),Gothenburg,Sweden [4]Department of Crop Science,Faculty of Agriculture,University of Peradeniya,Peradeniya,Sri Lanka

出　　处：《Journal of Forestry Research》2023年第4期889-901,共13页林业研究（英文版）

基　　金：funded by the Swedish Energy Agency (Project No 35586-1) for supporting the fieldwork;Special Project (No. 521100221033) of Hebei University for the interpretation of results

摘　　要：Forest plays a vital role in the global biogeochemical cycles through a high rate of carbon sequestration and harboring biodiversity.However,local species diversity is declining while also becoming increasingly homogenized across communities.Although eff ects of local biotic processes(e.g.,speciesα-diversity and stand structural heterogeneity)and environmental factors on aboveground biomass(AGB)have been widely tested,there is a huge knowledge gap for the eff ect of regional biotic processes(i.e.,taxonomic and functionalβ-diversity)in forests.Here,we hypothesized that regional and local environmental factors along with biotic processes jointly regulate AGB through species shifts in tropical forests.Using piecewise structural equation modeling(pSEM),we linked climatic water availability,soil fertility,stand structural heterogeneity(either tree DBH inequality,height inequality,or stand density),speciesα-diversity,taxonomic or functionalβ-diversity(and its two components;β-turnover andβ-richness),and AGB across 189 inventory plots in tropical forests of Sri Lanka.Soil fertility and climatic water availability shaped local and regional biotic processes.Stand structural heterogeneity promoted speciesα-diversity but declinedβ-diversity(but increasedβ-taxonomic turnover).Speciesα-diversity and stand structural heterogeneity promoted AGB whereas taxonomic and functionalβ-diversity declined(butβ-taxonomic turnover increased)AGB.The relationships of AGB with speciesα-diversity andβ-diversity varied from signifi cant to nonsignifi cant positive depending on the specifi c combinations of stand structural heterogeneity metrics used.This study shows that local biotic processes could increase AGB due to the local and regional niche complementarity eff ect whereas the regional biotic processes could restrict AGB due to the regional selection or functional redundancy eff ect under favorable environmental conditions.We argue that biotic homogenization,as well as drought conditions,may have strong divergent impacts on

关 键 词：BIODIVERSITY Biotic homogenization Climate Forest functioning Soil Tree size 

分 类 号：S718.5[农业科学—林学]