[ Diversité floristique et structure des formations végétales de la Forêt Classée de Pénéssoulou (Bénin, Afrique de l’Ouest) ]
Volume 54, Issue 2, May 2021, Pages 77–89
Léonce O. S. N. Dossa1, Aristide Cossi Adomou2, Gbèwonmèdéa Hospice Dassou3, and Gbènakpon Aubin Y. G. Amagnide4
1 Laboratoire de Botanique et Ecologie Végétale, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, Benin
2 Laboratoire de Botanique et Ecologie Végétale, Université d’Abomey-Calavi, Faculté des Sciences et Techniques, 01 B.P 4521 Cotonou, Benin
3 Laboratoire de Botanique et Ecologie Végétale, Université d’Abomey-Calavi, Faculté des Sciences et Techniques, 01 B.P 4521 Cotonou, Benin
4 Laboratoire de Biomathématiques et d’Estimations Forestières, Faculté des Sciences Agronomiques, 04 BP 1525 Cotonou, Benin
Original language: French
Copyright © 2021 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 study assessed the floristic diversity and analysed the structure of plant groups in the Pénéssoulou Forest Reserve (PFR). For this purpose, 234 plots of 50 m × 20 m each were installed in delimited floristically homogenous stands. An individualization of the different plant groups of the PFR was carried out using non-metric multidimensional scaling. Alpha diversity indices were used to evaluate the floristic diversity of the plant communities. Dendrometric parameters and size class structures of diameter and height were performed to understand the conservation status of the identified plant communities. Four plant communities was identified: G1 corresponded to woodlands and savannah woodlands with Vitellaria paradoxa and Uapaca togoensis as characteristic species, and including 81 woody species; G2 corresponded to forest gallery, dominated by Anogeissus leiocarpa and Cola gigantea and including 100 woody species; G3 corresponding to tree and shrub savannahs with Vitellaria paradoxa and Parinari curatellifolia as characteristic species, and including 64 woody species; and G4 corresponded to Anogeissus leiocarpa - Lonchocarpus sericeus dry forest that included 75 woody species. The dendrometric parameters varied significantly from a plant group to another (P-value < 0.05). The distribution of tree diameters was in an inverted «J» shape, characteristic of multi-species stands. As for the structures in height, they reflected a rarity of higher individuals (>20 m). The results showed an acceptable state of conservation and a good natural regeneration capacity of the forest, which must be improved through the implementation of a forest management plan.
Author Keywords: Plant community, flora, dendrometry, protected area, Benin.
Volume 54, Issue 2, May 2021, Pages 77–89
Léonce O. S. N. Dossa1, Aristide Cossi Adomou2, Gbèwonmèdéa Hospice Dassou3, and Gbènakpon Aubin Y. G. Amagnide4
1 Laboratoire de Botanique et Ecologie Végétale, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, Benin
2 Laboratoire de Botanique et Ecologie Végétale, Université d’Abomey-Calavi, Faculté des Sciences et Techniques, 01 B.P 4521 Cotonou, Benin
3 Laboratoire de Botanique et Ecologie Végétale, Université d’Abomey-Calavi, Faculté des Sciences et Techniques, 01 B.P 4521 Cotonou, Benin
4 Laboratoire de Biomathématiques et d’Estimations Forestières, Faculté des Sciences Agronomiques, 04 BP 1525 Cotonou, Benin
Original language: French
Copyright © 2021 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 study assessed the floristic diversity and analysed the structure of plant groups in the Pénéssoulou Forest Reserve (PFR). For this purpose, 234 plots of 50 m × 20 m each were installed in delimited floristically homogenous stands. An individualization of the different plant groups of the PFR was carried out using non-metric multidimensional scaling. Alpha diversity indices were used to evaluate the floristic diversity of the plant communities. Dendrometric parameters and size class structures of diameter and height were performed to understand the conservation status of the identified plant communities. Four plant communities was identified: G1 corresponded to woodlands and savannah woodlands with Vitellaria paradoxa and Uapaca togoensis as characteristic species, and including 81 woody species; G2 corresponded to forest gallery, dominated by Anogeissus leiocarpa and Cola gigantea and including 100 woody species; G3 corresponding to tree and shrub savannahs with Vitellaria paradoxa and Parinari curatellifolia as characteristic species, and including 64 woody species; and G4 corresponded to Anogeissus leiocarpa - Lonchocarpus sericeus dry forest that included 75 woody species. The dendrometric parameters varied significantly from a plant group to another (P-value < 0.05). The distribution of tree diameters was in an inverted «J» shape, characteristic of multi-species stands. As for the structures in height, they reflected a rarity of higher individuals (>20 m). The results showed an acceptable state of conservation and a good natural regeneration capacity of the forest, which must be improved through the implementation of a forest management plan.
Author Keywords: Plant community, flora, dendrometry, protected area, Benin.
Abstract: (french)
L’étude a évalué la diversité floristique et analysé la structure des formations végétales de la Forêt Classée de Pénéssoulou (FCP). Pour ce faire, 234 placeaux de 50 m × 20 m ont été installés. Une individualisation des différents groupements végétaux a été faite en utilisant le positionnement multidimensionnel. Les indices de diversité alpha ont été estimés pour évaluer la diversité floristique des groupements végétaux. La détermination des paramètres dendrométriques et l’établissement des structures en diamètre et en hauteur ont permis de caractériser la structure des différents groupements végétaux. Les résultats obtenus ont montré que la FCP comporte quatre groupements végétaux (G): G1 correspond au complexe forêt claire-savane boisée à Vitellaria paradoxa et Uapaca togoensis avec 81 espèces ligneuses; G2 correspond à la galerie forestière à Anogeissus leiocarpa et Cola gigantea avec 100 espèces ligneuses; G3 correspond au complexe savane arborée-savane arbustive à Vitellaria paradoxa et Parinari curatellifolia avec 64 espèces ligneuses et enfin G4 correspond à la forêt dense sèche à Anogeissus leiocarpa et Lonchocarpus sericeus avec 75 espèces ligneuses. Les paramètres dendrométriques ont varié significativement d’un groupement végétal à un autre (Prob. < 0,05). Les structures diamétriques du peuplement ligneux sont en «J renversé», caractéristique des peuplements naturels multispécifiques. Quant aux structures en hauteur, elles traduisent une rareté des individus de grandes hauteurs (>20 m). Les résultats obtenus montrent un état acceptable de conservation et un bon pouvoir régénératif de la forêt qui doivent être améliorés à travers la mise en œuvre d’un plan d’aménagement de ladite forêt.
Author Keywords: Groupement végétal, flore, dendrométrie, domaine protégé, Bénin.
How to Cite this Article
Léonce O. S. N. Dossa, Aristide Cossi Adomou, Gbèwonmèdéa Hospice Dassou, and Gbènakpon Aubin Y. G. Amagnide, “Floristic diversity and structure of plant communities of the Pénéssoulou Forest Reserve (Benin, West-Africa),” International Journal of Innovation and Scientific Research, vol. 54, no. 2, pp. 77–89, May 2021.
