Tree growth in West African cocoa agroforestry systems: high timber yields and superior performance of natural regeneration
Aimé K. Kouassi | Irié C. Zo-Bi | Bruno Hérault | Isaac K. Konan | Marie R. Dago | Baptiste Lasbats | Sylvain Schmitt | Anny E. N’Guessan | Raphaël Aussenac
Abstract Key message Cocoa agroforestry systems (AFS) in West Africa represent an underexplored yet promising source of timber. Within these systems, species can reach a 50-cm diameter as early as 14 years of age. Naturally regenerated trees grow 10% faster than planted ones and develop a 43% greater bole volume. These findings underscore the high timber potential of cocoa AFS and confirm natural regeneration as a superior strategy for tree renewal and wood production. Context In West Africa, where over 80% of original forests have been converted to agriculture, finding alternative timber sources is essential. Agroforestry, prevalent across the region, offers a potential solution. Aims This study assesses the timber production potential of trees in cocoa agroforestry systems in Côte d’Ivoire. Methods In 150 cocoa agroforestry plots, we (i) modelled the diameter growth of forest tree species; (ii) developed specific allometric models for cocoa AFS; and (iii) evaluated the effect of tree origin (natural regeneration vs. plantation) on growth trajectories, allometry, and bole volume. Results Trees can reach a diameter of 50 cm as early as 14 years of age, and a bole height of up to 8.83 m at this diameter. Naturally regenerated trees grow 10% faster annually than planted trees, reaching their minimum logging diameter up to 10 years earlier, and have a 43% greater bole volume. Conclusion Natural regeneration is a more effective strategy than planting for tree renewal in cocoa AFS, providing faster growth, greater timber volumes, and significant potential for sustainable forestry management and meeting regional timber demands.
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