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Impact of bark and foliage harvesting on fruit production of the multipurpose tree Afzelia africana in Burkina Faso (West Africa)

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Abstract

In sub-Saharan Africa, extraction for daily livelihood needs often results in uncontrolled exploitation of bark and leaves of valuable medicinal and fodder trees. However, overharvesting of bark and foliage can reduce fruit production and threaten reproduction. This study evaluates the impact of combined bark and foliage harvesting on the performance of fruit production of Afzelia africana in Burkina Faso. We compared fruit and seed production at different harvesting intensities. Data on fruit yields were collected by stratified random sampling of 91 trees with no, low, severe, and very severe harvesting intensities. The fruit production varied with harvesting intensity, tree size and number of branches. Fruit and seed quantity and quality decreased with increasing harvesting intensity. However, no significant difference was detected between trees without and trees under low harvesting. Trees of all size classes under very severe harvesting intensity had no fruits. Under low harvesting impact, large trees had twice as many fruits as the control, whereas fruits were reduced by half to 95 % for the small trees. High harvesting intensity is an unsustainable practice that should be completely prohibited in order to ensure longterm persistence of Afzelia africana. Low harvesting intensity should be allowed, but only on large reproductive individuals.

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Acknowledgments

This work was funded by SUN (FP7 INCO-dev 031685). We also thank the UNDESERT (EU FP7 243906) project for support. We are grateful to all foresters and guides of the Provincial and Departmental Forestry Office in Diapaga and especially to Commandant Célestin P. Zida, Commandant Zackaria Traoré and Lieutenant Daouda Traoré. We thank Mr Bourgou Sidiki and Mr Sinaré Cyrille for the field work assistance. We are also very grateful to Dr Fidèle Bognounou for providing advices in data analysis. We thank people living adjacent to the W National Park for collaboration during data collection. Finally, we thank the reviewers for helpful and constructive comments that significantly improved the manuscript.

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Correspondence to Blandine Marie Ivette Nacoulma.

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Nacoulma, B.M.I., Lykke, A.M., Traoré, S. et al. Impact of bark and foliage harvesting on fruit production of the multipurpose tree Afzelia africana in Burkina Faso (West Africa). Agroforest Syst 91, 565–576 (2017). https://doi.org/10.1007/s10457-016-9960-9

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  • DOI: https://doi.org/10.1007/s10457-016-9960-9

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