Global patterns and environmental drivers of forest functional composition

Author:

Bouchard Elise1ORCID,Searle Eric B.12ORCID,Drapeau Pierre1ORCID,Liang Jingjing3ORCID,Gamarra Javier G. P.4ORCID,Abegg MeinradORCID,Alberti GiorgioORCID,Zambrano Angelica Almeyda,Alvarez‐Davila EstebanORCID,Alves Luciana F.ORCID,Avitabile ValerioORCID,Aymard GerardoORCID,Bastin Jean‐FrançoisORCID,Birnbaum PhilippeORCID,Bongers FransORCID,Bouriaud OlivierORCID,Brancalion PedroORCID,Broadbent Eben,Bussotti FilippoORCID,Gatti Roberto CazzollaORCID,Češljar GoranORCID,Chisholm ChelseaORCID,Cienciala EmilORCID,Clark Connie J.,Corral‐Rivas José JavierORCID,Crowther Thomas W.ORCID,Dayanandan Selvadurai,Decuyper MathieuORCID,de Gasper André L.ORCID,de‐Miguel SergioORCID,Derroire GéraldineORCID,DeVries Ben,Djordjević IlijaORCID,Van Do TranORCID,Dolezal JiriORCID,Fayle Tom M.ORCID,Fridman JonasORCID,Frizzera LorenzoORCID,Gianelle DamianoORCID,Hemp Andreas,Hérault BrunoORCID,Herold MartinORCID,Imai Nobuo,Jagodziński Andrzej M.ORCID,Jaroszewicz BogdanORCID,Jucker TommasoORCID,Kepfer‐Rojas SebastianORCID,Keppel GunnarORCID,Khan Mohammed LatifORCID,Kim Hyun SeokORCID,Korjus HennORCID,Kraxner FlorianORCID,Laarmann Diana,Lewis SimonORCID,Lu HuicuiORCID,Maitner Brian S.ORCID,Marcon EricORCID,Marshall Andrew R.ORCID,Mukul Sharif A.ORCID,Nabuurs Gert‐JanORCID,Nava‐Miranda María GuadalupeORCID,Parfenova Elena I.ORCID,Park MinjeeORCID,Peri Pablo L.ORCID,Pfautsch SebastianORCID,Phillips Oliver L.ORCID,Piedade Maria Teresa F.ORCID,Piotto DanielORCID,Poulsen John R.ORCID,Poulsen Axel Dalberg,Pretzsch HansORCID,Reich Peter B.ORCID,Rodeghiero MircoORCID,Rolim SamirORCID,Rovero Francesco,Saikia PurabiORCID,Salas‐Eljatib ChristianORCID,Schall PeterORCID,Schepaschenko DmitryORCID,Schöngart Jochen,Šebeň VladimírORCID,Sist PlinioORCID,Slik FerryORCID,Souza Alexandre F.ORCID,Stereńczak KrzysztofORCID,Svoboda MiroslavORCID,Tchebakova Nadezhda M.ORCID,ter Steege HansORCID,Tikhonova Elena V.,Usoltsev Vladimir A.,Valladares Fernando,Viana HelderORCID,Vibrans Alexander C.ORCID,Wang Hua‐Feng,Westerlund BertilORCID,Wiser Susan K.ORCID,Wittmann FlorianORCID,Wortel VerginiaORCID,Zawiła‐Niedźwiecki Tomasz,Zhou Mo,Zhu Zhi‐Xin,Zo‐Bi Irié C.ORCID,Paquette Alain1ORCID

Affiliation:

1. Department of Biological Sciences, Centre for Forest Research (CFR) Université du Québec à Montréal Montreal Quebec Canada

2. Ontario Forest Research Institute Ontario Ministry of Natural Resources and Forestry Sault Ste. Marie Ontario Canada

3. Forest Advanced Computing and Artificial Intelligence Lab (FACAI), Department of Forestry and Natural Resources Purdue University West Lafayette Indiana USA

4. Forestry Division Food and Agriculture Organization of the United Nations Rome Italy

Abstract

AbstractAimTo determine the relationships between the functional trait composition of forest communities and environmental gradients across scales and biomes and the role of species relative abundances in these relationships.LocationGlobal.Time periodRecent.Major taxa studiedTrees.MethodsWe integrated species abundance records from worldwide forest inventories and associated functional traits (wood density, specific leaf area and seed mass) to obtain a data set of 99,953 to 149,285 plots (depending on the trait) spanning all forested continents. We computed community‐weighted and unweighted means of trait values for each plot and related them to three broad environmental gradients and their interactions (energy availability, precipitation and soil properties) at two scales (global and biomes).ResultsOur models explained up to 60% of the variance in trait distribution. At global scale, the energy gradient had the strongest influence on traits. However, within‐biome models revealed different relationships among biomes. Notably, the functional composition of tropical forests was more influenced by precipitation and soil properties than energy availability, whereas temperate forests showed the opposite pattern. Depending on the trait studied, response to gradients was more variable and proportionally weaker in boreal forests. Community unweighted means were better predicted than weighted means for almost all models.Main conclusionsWorldwide, trees require a large amount of energy (following latitude) to produce dense wood and seeds, while leaves with large surface to weight ratios are concentrated in temperate forests. However, patterns of functional composition within‐biome differ from global patterns due to biome specificities such as the presence of conifers or unique combinations of climatic and soil properties. We recommend assessing the sensitivity of tree functional traits to environmental changes in their geographic context. Furthermore, at a given site, the distribution of tree functional traits appears to be driven more by species presence than species abundance.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Wiley

Subject

Ecology,Ecology, Evolution, Behavior and Systematics,Global and Planetary Change

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