Pantropical variability in tree crown allometry

Loubota Panzou, G. J.; Fayolle, Adeline; Jucker, T.; Phillips, O. L.; Bohlman, S.; Banin, L. F.; Lewis, S. L.; Affum-Baffoe, K.; Alves, L. F.; Antin, C.; Arets, E.; Arroyo, L.; Baker, T. R.; Barbier, N.; Beeckman, H.; Berger, U.; Enock Bocko, Y.; Bongers, F.; Bowers, S.; Brade, T.; Brondizio, E. S.; Chantrain, A.; Chave, J.; Compaore, H.; Coomes, D.; Diallo, A.; Dias, A. S.; Dimobe, K.; Djaney Djagbletey, G.; Domingues, T.; Doucet, Jean-Louis; Drouet, T.; Forni, E.; Godlee, J. L.; Goodman, R. C.; Gourley-Fleury, S.; Hien, F.; Iida, Y.; Angoboy Ilonda, B.; Ilunga Muledi, J.; Jacques, P.; Kuyah, S.; Lopez-Portillo, J.; Loumeto, J. N.; Marimon-Junior, B. H.; Schwantes Marimon, B.; Mensah, S.; Mitchard, E. T. A.; Moncrieff, G. R.; Narayanan, A.; O'Brien, S. T.; Ouedraogo, K.; Palace, M. W.; Pelissier, R.; Ploton, P.; Poorter, L.; Ryan, M. W.; Saiz, G.; dos Santos, K.; Schlund, M.; Sellan, G.; Sonke, B.; Sterck, F.; Thibaut, Q.; Van Hoef, Y.; Veenendaal, E.; Vovides, A. G.; Xu, Y.; Leong Yao, T.; Feldpausch, T. R.

doi:10.1111/geb.13231

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Pantropical variability in tree crown allometry

Loubota Panzou, G. J.; Fayolle, Adeline; Jucker, T. et al.

2020 • In Global Ecology and Biogeography, p. 17

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https://hdl.handle.net/2268/258121

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10.1111/geb.13231

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Keywords :

crown allometry; environment; forest precipitation; savanna; soil; stand-level variable; tropical biomes

Abstract :

[en] 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 Major taxa studied: Woody plants. 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. 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.

Disciplines :

Phytobiology (plant sciences, forestry, mycology...)
Agriculture & agronomy

Author, co-author :

Loubota Panzou, G. J.

Fayolle, Adeline ; Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels

Jucker, T.

Phillips, O. L.

Bohlman, S.

Banin, L. F.

Lewis, S. L.

Affum-Baffoe, K.

Alves, L. F.

Antin, C.

More authors (60 more)

Language :

English

Title :

Pantropical variability in tree crown allometry

Publication date :

12 December 2020

Journal title :

Global Ecology and Biogeography

ISSN :

1466-822X

eISSN :

1466-8238

Publisher :

Wiley, Oxford, United Kingdom

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

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since 17 March 2021

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