Publications Scientifiques

[ Article ] Ecological consequences of anthropogenic pressure in Wari-Maro Forest Reserve (Benin, West Africa)

Date de soumission: 22-09-2016
Année de Publication: 2015
Entité/Laboratoire Laboratoire de Biomathématiques et d'Estimations Forestières (LABEF)
Document type : Article
Discipline(s) : Sciences Environnement &Ecologie
Titre Ecological consequences of anthropogenic pressure in Wari-Maro Forest Reserve (Benin, West Africa)
Journal: Journal of Agriculture and Environment for International Development
Catégorie Journal: Internationale
Impact factor: 0
Volume Journal: 109
DOI: 10.12895/jaeid.20152.363
Resume This study assessed ecological consequences of anthropogenic pressure in Wari-Maro Forest Reserve (WMFR). First, the dynamics of the forest cover was assessed using a diachronic analysis of land cover maps from Landsat images of 1986, 1995 and 2006. Then, structure of the forest was described. To this end, twenty five (25) one-hectare plots were established using a stratified random sampling technics. The strata were the two main vegetation types (Tree savannah versus woodland) in the WMFR. Within each one-hectare plot, two subplots of 50 m x 30 m were established. All stumps of logged trees and all trees of diameter at breast height (DBH) ≥ 10 cm were counted and identified in the one-hectare plots to reveal the most logged tree species. In the subplots, all standing tree species of DBH ≥ 10 cm were measured for DBH and total height. Stumps of logged trees in the subplots were also measured for diameter at 0.10 m. Data of subplots were used to estimate volume of trees from which we derived carbon stock and carbon loss using conversion and expansion factors. For the two periods 1986 to 1995 and 1995 to 2006, there was a general decline in forest cover, which was however slowed down in the second decade (0.196 %. year-1 versus 0.083 %.year-1 respectively). Top five (5) targeted species in illegal logging were: Pterocarpus erinaceus Poir., Afzelia africana Sm., Isoberlinia spp., Anogeissus leiocarpa Guill., and Daniellia oliveri (Rolfe) Hutch. & Dalziel. Mean values of carbon stock and carbon losses for the whole forest was 147.84 tons C.ha-1 and 17.57 tons C.ha-1 respectively and did not depend on the vegetation type. Results from this study suggest that management strategies should focus on selectively logged species. Monitoring should be enhanced to reduce the illegal logging pressure under a certain level over which survival of the targeted species might be problematic.
Mots clés anthropogenic pressure, forest cover, structure, carbon stock, Wari-Maro forest reserve, Benin.
Pages 271 - 289
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