Pantropical variability in tree crown allometry

Loubota Panzou Grace Jopaul, Fayolle Adeline, Jucker Tommaso, Phillips Oliver L., Bohlman Stephanie, Banin Lindsay F., Lewis Simon L., Affum-Baffoe Kofi, Alves Luciana F., Antin Cécile, Arets Eric, Arroyo Luzmila, Baker Timothy R., Barbier Nicolas, Beeckman Hans, Berger Uta, Bocko Yannick, Bongers Frans, Bowers Samuel, Brade Thomas, Brondizio Eduardo S., Chantrain Arthur, Chave Jérôme, Compaore Halidou, Coomes David A., Diallo Adama, Dias Arildo S., Dimobe Kangbéni, Djaney Djagbletey Gloria, Domingues Tomas, Doucet Jean-Louis, Drouet Thomas, Forni Eric, Godlee John L., Goodman Rosa C., Gourlet-Fleury Sylvie, et al.. 2021. Pantropical variability in tree crown allometry. Global Ecology and Biogeography, 30 (2) : 459-475.

Url - jeu de données - Entrepôt autre : http://doi.org/10.5521/forestplots.net/2020_8

Quartile : Q1, Sujet : ECOLOGY / Quartile : Q1, Sujet : GEOGRAPHY, PHYSICAL

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Géographie-Aménagement-Urbanisme-Architecture

Résumé : Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large-scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site-specific crown allometry and assessed their relationships with environmental and stand-level variables in the tropics. Location: Global tropics. Time period: Early 21st century. Major taxa studied: Woody plants. Methods: Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site-specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power-law models. Stand-level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales. Results: The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand-level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests. Main conclusions: Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand-level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.

Mots-clés Agrovoc : allométrie, anatomie végétale, Houppier, classe de cime, biomasse aérienne des arbres, forêt tropicale, zone tropicale, télédétection

Mots-clés libres : Crown allometry, Forest, Precipitation, Savannah, Soil, Tropical biomes

Classification Agris : K01 - Foresterie - Considérations générales
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

• Loubota Panzou Grace Jopaul, UMNG (COG) - auteur correspondant
• Fayolle Adeline, Université de Liège (BEL)
• Jucker Tommaso, University of Bristol (GBR)
• Phillips Oliver L., University of Leeds (GBR)
• Bohlman Stephanie, University of Florida (USA)
• Banin Lindsay F., Centre for Ecology and Hydrology (GBR)
• Lewis Simon L., University of Leeds (GBR)
• Affum-Baffoe Kofi, Forestry Commission (GHA)
• Alves Luciana F., UC (USA)
• Antin Cécile, IRD (FRA)
• Arets Eric, Wageningen University and Research Centre (NLD)
• Arroyo Luzmila, UAGRM (BOL)
• Baker Timothy R., University of Leeds (GBR)
• Barbier Nicolas, IRD (FRA)
• Beeckman Hans, Musée royal de l'Afrique centrale (BEL)
• Berger Uta, Technische Universität Dresden (DEU)
• Bocko Yannick, UMNG (COG)
• Bongers Frans, Wageningen University and Research Centre (NLD)
• Bowers Samuel, University of Edinburgh (GBR)
• Brade Thomas, University of Edinburgh (GBR)
• Brondizio Eduardo S., Indiana University Bloomington (USA)
• Chantrain Arthur, Université de Liège (BEL)
• Chave Jérôme, CNRS (FRA)
• Compaore Halidou, INERA (BFA)
• Coomes David A., University of Cambridge (GBR)
• Diallo Adama, CNSF (BFA)
• Dias Arildo S., Johann Wolfgang Goethe University (DEU)
• Dimobe Kangbéni, Université de Ouagadougou (BFA)
• Djaney Djagbletey Gloria, FORIG (GHA)
• Domingues Tomas, USP (BRA)
• Doucet Jean-Louis, Université de Liège (BEL)
• Drouet Thomas, ULB (BEL)
• Forni Eric, CIRAD-ES-UPR Forêts et sociétés (COG)
• Godlee John L., University of Edinburgh (GBR)
• Goodman Rosa C., University of Agricultural Sciences (SWE)
• Gourlet-Fleury Sylvie, CIRAD-ES-UPR Forêts et sociétés (FRA) ORCID: 0000-0002-1136-4307
• et al.

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599164/)

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