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Pantropical variability in tree crown allometry

Grace Jopaul Loubota Panzou 1 Adeline Fayolle 2 Tommaso Jucker 3 Oliver Phillips 4 Stephanie Bohlman 5 Lindsay Banin 6 Simon Lewis 7 Kofi Affum‐baffoe 8 Luciana Alves Cécile Antin 9 Eric Arets 10 Luzmila Arroyo 11 Timothy R. Baker 4 Nicolas Barbier 9 Hans Beeckman 12 Uta Berger 13 Yannick Enock Bocko 14 Frans Bongers 15 Sam Bowers 16 Thom Brade 16 Eduardo Brondizio 17 Arthur Chantrain 2 Jérôme Chave 18 Halidou Compaore 19 David Coomes 20 Adama S. Diallo Arildo Dias 21 Kangbéni Dimobe Gloria Djaney Djagbletey Tomas Domingues Jean‐louis Doucet 2 Thomas Drouet 22 Eric Forni 23, 24 John Godlee 16 Rosa Goodman Sylvie Gourlet‐fleury 23, 24 Fidele Hien Yoshiko Iida Bhely Angoboy Ilondea Jonathan Ilunga Muledi Pierre Jacques 2 Shem Kuyah Jorge López‐portillo Jean Joël Loumeto Ben Hur Marimon‐junior Beatriz Schwantes Marimon Sylvanus Mensah Edward Mitchard Glenn Moncrieff Ayyappan Narayanan 25 Sean O’brien Korotimi Ouedraogo Michael W. Palace Raphaël Pélissier 9 Pierre Ploton 9 Lourens Poorter 15 Casey Ryan 16 Gustavo Saiz Karin dos Santos Michael Schlund Giacomo Sellan Bonaventure Sonke Frank Sterck Quentin Thibaut 2 Yorick van Hoef Elmar Veenendaal Alejandra Vovides Yaozhan Xu Tze Leong Yao Ted Feldpausch 1 
Abstract : 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.
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Submitted on : Monday, April 26, 2021 - 4:21:56 PM
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Grace Jopaul Loubota Panzou, Adeline Fayolle, Tommaso Jucker, Oliver Phillips, Stephanie Bohlman, et al.. Pantropical variability in tree crown allometry. Global Ecology and Biogeography, Wiley, 2021, 30 (2), pp.459-475. ⟨10.1111/geb.13231⟩. ⟨hal-03103872⟩



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