[ Evaluation des impacts de l’exploitation de la cimenterie d’Onigbolo sur la flore et la végétation environnantes dans la commune de Pobè (sud-Bénin) ]
Volume 32, Issue 4, May 2021, Pages 509–521
Dadjèdji Léon FANANKPON1, AHOUANDJINOU S. Thibaut Bidossèssi2, and Hounnankpon YEDOMONHAN3
1 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 Cotonou, Benin
2 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 Cotonou, Benin
3 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 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 mining sector is often presented as a driver of economic growth. However, it has negative effects on flora and vegetation. This study aims to assess the structure and floristic diversity of the vegetation in the area of the SCB-Lafarge cement works of Onigbolo in the municipality of Pobè (southern Benin). The data were collected by means of floristic surveys carried out in 60 rectangular plots of 500 m2 including 30 in abandoned quarries and 30 in non-exploited areas. The vegetation of abandoned quarries has been distinguished into 2 plant formations and that of unexploited areas comprises 4 types of vegetation. A total of 304 species have been recorded, including 180 in quarries and 248 in non-exploited areas. The specific richness varies from one plant formation to another in the two zones. The average specific diversity (4.63 bits) of quarries is lower than that of non-exploited areas (5.62 bits). The density of the woody plants varies from 90 to 132 stems / ha in the quarries and from 160 to 268 stems / ha in the non-exploited areas. The basal area is 2.80 m2 / ha in the quarries and varies from 5.40 to 17.16 m2 / ha in the non-exploited areas. The vegetation of abandoned quarries is floristically less diversified and less structured than that of unexploited areas. The exploitation of limestone therefore participates in the reduction of flora diversity and regressively affects the density and basal area of the woody stand.
Author Keywords: SCB-Lafarge, negative effects, plant communities, Onigbolo, Benin.
Volume 32, Issue 4, May 2021, Pages 509–521
Dadjèdji Léon FANANKPON1, AHOUANDJINOU S. Thibaut Bidossèssi2, and Hounnankpon YEDOMONHAN3
1 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 Cotonou, Benin
2 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 Cotonou, Benin
3 Department of plant Biology, Laboratory of Botany and Plant Ecology, Faculty of Science and Technology, University of Abomey-Calavi, Abomey-Calavi, 01 BP 4521 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 mining sector is often presented as a driver of economic growth. However, it has negative effects on flora and vegetation. This study aims to assess the structure and floristic diversity of the vegetation in the area of the SCB-Lafarge cement works of Onigbolo in the municipality of Pobè (southern Benin). The data were collected by means of floristic surveys carried out in 60 rectangular plots of 500 m2 including 30 in abandoned quarries and 30 in non-exploited areas. The vegetation of abandoned quarries has been distinguished into 2 plant formations and that of unexploited areas comprises 4 types of vegetation. A total of 304 species have been recorded, including 180 in quarries and 248 in non-exploited areas. The specific richness varies from one plant formation to another in the two zones. The average specific diversity (4.63 bits) of quarries is lower than that of non-exploited areas (5.62 bits). The density of the woody plants varies from 90 to 132 stems / ha in the quarries and from 160 to 268 stems / ha in the non-exploited areas. The basal area is 2.80 m2 / ha in the quarries and varies from 5.40 to 17.16 m2 / ha in the non-exploited areas. The vegetation of abandoned quarries is floristically less diversified and less structured than that of unexploited areas. The exploitation of limestone therefore participates in the reduction of flora diversity and regressively affects the density and basal area of the woody stand.
Author Keywords: SCB-Lafarge, negative effects, plant communities, Onigbolo, Benin.
Abstract: (french)
Le secteur minier est souvent présenté comme porteur de croissance économique. Cependant, il a des effets négatifs sur la flore et la végétation. Cette étude vise à évaluer la structure et la diversité floristique de la végétation du domaine d’emprise de la cimenterie SCB-Lafarge d’Onigbolo dans la commune de Pobè (sud-Bénin). Les données ont été collectées aux moyens des relevés floristiques effectués dans 60 placeaux rectangulaires de 500 m2 dont 30 dans les carrières abandonnées et 30 dans les zones non exploitées. La végétation des carrières abandonnées a été discriminée en 2 formations végétales et celle des zones non exploitées comporte 4 types de végétation. Au total, 304 espèces ont été recensées dont 180 dans les carrières et 248 dans les zones non exploitées. La richesse spécifique varie d’une formation végétale à l’autre dans les deux zones. La diversité spécifique moyenne (4,63 bits) des carrières est inférieure à celle des zones non exploitées (5,62 bits). La densité des ligneux varie de 90 à 132 tiges/ha dans les carrières et de 160 à 268 tiges/ha dans les zones non exploitées. La surface terrière est de 2,80 m2/ha dans les carrières et varie de 5,40 à 17,16 m2/ha dans les zones non exploitées. La végétation des carrières abandonnées est floristiquement moins diversifiée et moins structurée que celle des zones non exploitées. L’exploitation du calcaire participe donc à la réduction de la diversité floristique et affecte de façon régressive, la densité et la surface terrière du peuplement ligneux.
Author Keywords: SCB-Lafarge, effets négatifs, communautés végétales, Onigbolo, Bénin.
How to Cite this Article
Dadjèdji Léon FANANKPON, AHOUANDJINOU S. Thibaut Bidossèssi, and Hounnankpon YEDOMONHAN, “Assessment of the impacts of the operation of the Onigbolo cement plant on the surrounding flora and vegetation in the commune of Pobè (south Benin),” International Journal of Innovation and Applied Studies, vol. 32, no. 4, pp. 509–521, May 2021.
