Pantropical variability in tree crown allometry

Loubota Panzou, Grace Jopaul; Fayolle, Adeline; Jucker, Tommaso; Phillips, Oliver L.; Bohlman, Stephanie; Banin, Lindsay F. ORCID:; 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 Enock; Bongers, Frans; Bowers, Sam; Brade, Thom; Brondizio, Eduardo S.; Chantrain, Arthur; Chave, Jerome; Compaore, Halidou; Coomes, David; Diallo, Adama; Dias, Arildo S.; Dimobe, Kangbéni; Djagbletey, Gloria Djaney; Domingues, Tomas; Doucet, Jean‐Louis; Drouet, Thomas; Forni, Eric; Godlee, John L.; Goodman, Rosa C.; Gourlet‐Fleury, Sylvie; Hien, Fidele; Iida, Yoshiko; Ilondea, Bhely Angoboy; Ilunga Muledi, Jonathan; Jacques, Pierre; Kuyah, Shem; López‐Portillo, Jorge; Loumeto, Jean Joël; Marimon‐Junior, Ben Hur; Marimon, Beatriz Schwantes; Mensah, Sylvanus; Mitchard, Edward T.A.; Moncrieff, Glenn R.; Narayanan, Ayyappan; O’Brien, Sean T.; Ouedraogo, Korotimi; Palace, Michael W.; Pelissier, Raphael; Ploton, Pierre; Poorter, Lourens; Ryan, Casey M.; Saiz, Gustavo; Santos, Karin; Schlund, Michael; Sellan, Giacomo; Sonke, Bonaventure; Sterck, Frank; Thibaut, Quentin; Van Hoef, Yorick; Veenendaal, Elmar; Vovides, Alejandra G.; Xu, Yaozhan; Yao, Tze Leong; Feldpausch, Ted R.. 2021 Pantropical variability in tree crown allometry. Global Ecology and Biogeography, 30 (2). 459-475.

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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.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN: 1466-822X
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: crown allometry, environment, forest, precipitation, savanna, soil, stand-level variable, tropical biomes
NORA Subject Terms: Ecology and Environment
Date made live: 29 Dec 2020 18:54 +0 (UTC)

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