[ Potentiel d’analyse des cernes de croissance: Cas de 09 essences forestières en Afrique Centrale ]
Volume 37, Issue 1, August 2022, Pages 49–60
Y. A. Amougou Ndi1, M. Mbolo2, F. B. Amougou Amougou3, and Ndongo Din4
1 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
2 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
3 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
4 Faculté des Sciences, Université de douala, Cameroon
Original language: French
Copyright © 2022 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The presence of growth rings on tropical tree species is proven. In addition, the data on tree growth rhythms are fragmentary for many commercial tree species in the Congo Basin, and several studies question the dendrometric parameter values provided by the forest administration, parameters generally from permanent sample plots. In this study, we have evaluated the potential of tree-rings analysis in the semi-deciduous rainforest in Central Africa. For this, we examined the anatomy of wood of nine tree species to determine the visibility of tree rings and, on the subset of four species whose tree rings are visible, the potential of cross-dating has been evaluated as well as the annual character of formation by tree- rings analysis on stem discs. The age of trees is obtained for each of these tree species: E. cylindricum; M. Altissima; M. Excelsa and T. scleroxylon respectively (137, 126, 87 and 67). And the respective annual diametrical increases of (0.68 ± 0.42; 0, 71 ± 0.31; 0.64 ± 0.29 and 1.02 ± 0.19 cm.an). The comparison of these values to that of the Cameroonian forest administration shows that the latter is higher: 0.5 cm. an E. cylindricum, M. Altissima, M. Excelsa and 0.9 cm.an for T. scleroxylon. This method can be applied to other distinct and annual commercial tree species with distinct and annual tree rings to provide new data and fill the knowledge deficit on the growth rates of tropical trees.
Author Keywords: Tree rings analysis, tree age, diametric increment, Cameroun, wood anatomy.
Volume 37, Issue 1, August 2022, Pages 49–60
Y. A. Amougou Ndi1, M. Mbolo2, F. B. Amougou Amougou3, and Ndongo Din4
1 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
2 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
3 Département de Biologie et Physiologie Végétales, Faculté des sciences, Université de Yaoundé 1, Cameroon
4 Faculté des Sciences, Université de douala, Cameroon
Original language: French
Copyright © 2022 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The presence of growth rings on tropical tree species is proven. In addition, the data on tree growth rhythms are fragmentary for many commercial tree species in the Congo Basin, and several studies question the dendrometric parameter values provided by the forest administration, parameters generally from permanent sample plots. In this study, we have evaluated the potential of tree-rings analysis in the semi-deciduous rainforest in Central Africa. For this, we examined the anatomy of wood of nine tree species to determine the visibility of tree rings and, on the subset of four species whose tree rings are visible, the potential of cross-dating has been evaluated as well as the annual character of formation by tree- rings analysis on stem discs. The age of trees is obtained for each of these tree species: E. cylindricum; M. Altissima; M. Excelsa and T. scleroxylon respectively (137, 126, 87 and 67). And the respective annual diametrical increases of (0.68 ± 0.42; 0, 71 ± 0.31; 0.64 ± 0.29 and 1.02 ± 0.19 cm.an). The comparison of these values to that of the Cameroonian forest administration shows that the latter is higher: 0.5 cm. an E. cylindricum, M. Altissima, M. Excelsa and 0.9 cm.an for T. scleroxylon. This method can be applied to other distinct and annual commercial tree species with distinct and annual tree rings to provide new data and fill the knowledge deficit on the growth rates of tropical trees.
Author Keywords: Tree rings analysis, tree age, diametric increment, Cameroun, wood anatomy.
Abstract: (french)
La présence des cernes de croissance sur les essences forestières tropicales est avérée. De plus les données sur les rythmes de croissance des arbres sont fragmentaires pour de nombreuses essences commerciales du Bassin du Congo, et plusieurs études mettent en doute les valeurs de paramètres dendrométriques fournies par l’administration forestière, paramètre provenant généralement des parcelles permanentes. Dans cette étude, nous avons évalué le potentiel d'analyse des cernes en forêt tropicale humide semi décidue d’Afrique Centrale. À cette fin, nous avons examiné l'anatomie du bois de neuf essences pour déterminer la visibilité des cernes et, sur un sous-ensemble de quatre essences dont les cernes sont visibles, le potentiel d’interdatation a été évalué ainsi que le caractère annuel de la formation des cernes par l’analyse des cernes sur des rondelles de bois. L’âge des arbres est obtenu pour chacune de ces essences forestières: E. cylindricum; M. altissima; M. excelsa et T.scleroxylon respectivement de (137, 126 87 et 67 ans). Et les accroissements diamétriques annuels respectifs de (0,68 ± 0,42; 0, 71 ± 0,31; 0,64 ± 0,29 et 1,02 ± 0,19 cm.an). La comparaison de ces valeurs à celle de l’administration forestière Camerounaise, montrent que ces dernières sont supérieurs: 0,5 cm.an E. cylindricum, M. altissima, M. excelsa et de 0,9 cm.an pour T.scleroxylon. Cette méthode peut être appliquée à d’autres essences commerciales à cernes distincts et annuels pour fournir de nouvelles données et combler le déficit de connaissance sur les rythmes de croissance des arbres tropicaux.
Author Keywords: Analyse de cernes, âge des arbres, accroissement diamétrique, Cameroun, Anatomie du bois.
How to Cite this Article
Y. A. Amougou Ndi, M. Mbolo, F. B. Amougou Amougou, and Ndongo Din, “Potential of tree-ring analysis: A case study on 09 commercial tree species in Central Africa,” International Journal of Innovation and Applied Studies, vol. 37, no. 1, pp. 49–60, August 2022.
