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The Royal Society, Philosophical Transactions of the Royal Society B: Biological Sciences, 1625(368), p. 20120295, 2013

DOI: 10.1098/rstb.2012.0295

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Above-ground biomass and structure of 260 African tropical forests

Journal article published in 2013 by Simon Wilcock, Simon L. Lewis, Bonaventure Sonké, Terry Sunderland, Serge K. Begne, Gabriela Lopez-Gonzalez, Geertje M. F. van der Heijden, Oliver L. Phillips ORCID, Gmf Van der Heijden, Kofi Affum-Baffoe, Timothy R. Baker, Lindsay Banin, Jean-François Bastin, Hans Beeckman ORCID, Pascal Boeckx and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We report above-ground biomass (AGB), basal area, stem density and wood mass density estimates from 260 sample plots (mean size: 1.2 ha) in intact closed-canopy tropical forests across 12 African countries. Mean AGB is 395.7 Mg dry mass ha-1 (95% CI: 14.3), substantially higher than Amazonian values, with the Congo Basin and contiguous forest region attaining AGB values (429 Mg ha-1) similar to those of Bornean forests, and significantly greater than East or West African forests. AGB therefore appears generally higher in palaeo- compared with neotropical forests. However, mean stem density is low (426 ± 11 stems ha-1 greater than or equal to 100 mm diameter) compared with both Amazonian and Bornean forests (cf. approx. 600) and is the signature structural feature of African tropical forests. While spatial autocorrelation complicates analyses, AGB shows a positive relationship with rainfall in the driest nine months of the year, and an opposite association with the wettest three months of the year; a negative relationship with temperature; positive relationship with clay-rich soils; and negative relationships with C : N ratio (suggesting a positive soil phosphorus-AGB relationship), and soil fertility computed as the sum of base cations. The results indicate that AGB is mediated by both climate and soils, and suggest that the AGB of African closed-canopy tropical forests may be particularly sensitive to future precipitation and temperature changes. ; Additional co-authors: Charles De Cannière, Eric Chezeaux, Connie J. Clark, Murray Collins, Gloria Djagbletey, Marie Noël K. Djuikouo, Vincent Droissart, Jean-Louis Doucet, Cornielle E. N. Ewango, Sophie Fauset, Ted R. Feldpausch, Ernest G. Foli, Jean-François Gillet, Alan C. Hamilton, David J. Harris, Terese B. Hart, Thales de Haulleville, Annette Hladik, Koen Hufkens, Dries Huygens, Philippe Jeanmart, Elizabeth Kearsley, Miguel E. Leal, Jon Lloyd, Jon C. Lovett, Jean-Remy Makan, Yadvinder Malhi, Andrew R. Marshall, Lucas Ojo, Kelvin S.-H. Peh, Georgia Pickavance, John R. Poulsen, Jan M. Reitsma, Douglas Sheil, Murielle Simo, Kathy Steppe, Hermann E. Taedoumg, Joey Talbot, James R. D. Taplin, David Taylor, Sean C. Thomas, Benjamin Toirambe, Hans Verbeeck, Jason Vleminckx, Simon Willcock, Hannsjorg Woell and Lise Zemagho