Tree growth and mortality of 42 timber species in central Africa

Ligot Gauthier, Gourlet-Fleury Sylvie, Daïnou Kasso, Gilet Jean-François, Rossi Vivien, Mazengue Mathurin, Nna Ekome Stevy, Nkoulou Yanick Serge, Zombo Isaac, Forni Eric, Doucet Jean-Louis. 2022. Tree growth and mortality of 42 timber species in central Africa. Forest Ecology and Management, 505:119889, 13 p.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/EBN15Y

Résumé : Tree growth and mortality are two central processes in mixed and structurally complex moist tropical forests, yet accurate estimates of the variables needed to model them remain sparse and scattered. It is thus still difficult to predict forest evolution at a local scale and build reliable management plans. To help fill this gap, for 1–7 years we annually monitored 21,180 trees belonging to 42 species exploited for timber production in Central Africa. We made new species-specific estimates of diameter increments and mortality rates, and investigated how tree growth varied with tree size and logging history. We compared our results with the legal values of diameter increments, mortality rates, and minimum cutting diameters used to build forest management plans in Cameroon. Diameter increment was found to vary with tree size for most of the species studied. The relationships between diameter increment and tree size were mostly humpback-shaped. The trees with diameters close to or lower than the reference minimum cutting diameter generally grew faster than the average. We also found that tree growth could slow for 1–2 years after timber exploitation and was then spurred for at least 5 years. The tree growth response to logging was nevertheless species-specific. This study provides new estimates of tree diameter increments and mortality rates that could help make more accurate forest projections and draw up sustainable management plans in Africa.

Mots-clés Agrovoc : santé des forêts, production forestière, dynamique des populations, arbre forestier, croissance, mortalité, accroissement forestier, forêt tropicale humide

Mots-clés géographiques Agrovoc : Cameroun, Gabon, Congo

Mots-clés libres : Tropical rainforest, Population dynamics, Annual tree monitoring, Logging effect

Classification Agris : K01 - Foresterie - Considérations générales
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Ligot Gauthier, Université de Liège (BEL) - auteur correspondant
• Gourlet-Fleury Sylvie, CIRAD-ES-UPR Forêts et sociétés (FRA) ORCID: 0000-0002-1136-4307
• Daïnou Kasso, Université de Liège (BEL)
• Gilet Jean-François, Université de Liège (BEL)
• Rossi Vivien, CIRAD-ES-UPR Forêts et sociétés (CMR) ORCID: 0000-0001-5458-1523
• Mazengue Mathurin, Mokabi (COG)
• Nna Ekome Stevy, CEB Precious Wood (GAB)
• Nkoulou Yanick Serge, Pallisco CIFM (CMR)
• Zombo Isaac, CIB [Congolaise industrielle des bois] (COG)
• Forni Eric, CIRAD-ES-UPR Forêts et sociétés (COG)
• Doucet Jean-Louis, Université de Liège (BEL)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/599920/)

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