Pantropical variability in tree crown allometry

Grace Jopaul Loubota Panzou*, Adeline Fayolle, Tommaso Jucker, Oliver L. Phillips, Stephanie Bohlman, Lindsay F. Banin, Simon L. Lewis, Kofi Affum-Baffoe, Luciana F. Alves, Cécile Antin, Eric Arets, Luzmila Arroyo, Timothy R. Baker, Nicolas Barbier, Hans Beeckman, Uta Berger, Yannick Enock Bocko, Frans Bongers, Sam Bowers, Thom BradeEduardo S. Brondizio, Arthur Chantrain, Jerome Chave, Halidou Compaore, David Coomes, Adama Diallo, Arildo S. Dias, Kangbéni Dimobe, Gloria Djaney Djagbletey, Tomas Domingues, Jean Louis Doucet, Thomas Drouet, Eric Forni, John L. Godlee, Rosa C. Goodman, Sylvie Gourlet-Fleury, Fidele Hien, Yoshiko Iida, Bhely Angoboy Ilondea, Jonathan Ilunga Muledi, Pierre Jacques, Shem Kuyah, Jorge López-Portillo, Jean Joël Loumeto, Ben Hur Marimon-Junior, Beatriz Schwantes Marimon, Sylvanus Mensah, Edward T.A. Mitchard, Glenn R. Moncrieff, Ayyappan Narayanan, Sean T. O’Brien, Korotimi Ouedraogo, Michael W. Palace, Raphael Pelissier, Pierre Ploton, Lourens Poorter, Casey M. Ryan, Gustavo Saiz, Karin dos Santos, M. Schlund, Giacomo Sellan, Bonaventure Sonke, Frank Sterck, Quentin Thibaut, Yorick Van Hoef, Elmar Veenendaal, Alejandra G. Vovides, Yaozhan Xu, Tze Leong Yao, Ted R. Feldpausch

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
4 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)459-475
Number of pages17
JournalGlobal ecology and biogeography
Volume30
Issue number2
Early online date12 Dec 2020
DOIs
Publication statusPublished - Feb 2021
Externally publishedYes

Keywords

  • crown allometry
  • environment
  • forest
  • precipitation
  • savanna
  • soil
  • stand-level variable
  • tropical biomes
  • ITC-CV

Fingerprint

Dive into the research topics of 'Pantropical variability in tree crown allometry'. Together they form a unique fingerprint.

Cite this