[ Dynamique spatiale et temporelle de la couverture ligneuse du bassin versant du Kou au Burkina Faso ]
Volume 41, Issue 1, November 2023, Pages 289–299
B. Dembele1, Alain P. K. Gomgnimbou2, J. T. Yameogo3, O. W. Ouedraogo4, and Boalidioa TANKOANO5
1 Université Nazi BONI, Institut du Développement Rural, Laboratoire des Systèmes Naturels, Agrosystèmes et de l’Ingénierie de l’Environnement (Sy.N.A.I.E), 01 BP 1091 Bobo-Dioulasso 01, Bobo Dioulasso, Burkina Faso
2 Laboratoire Sol-Eau-Plante, Programme de Recherche Gestion des Ressources Naturelles et Système de Production, Institut de l’Environnement et de Recherche Agricole, Station de Farako-Bâ, Bobo-Dioulasso, Burkina Faso
3 Université Nazi BONI, Institut du Développement Rural, Laboratoire des Systèmes Naturels, Agrosystèmes et de l’Ingénierie de l’Environnement (Sy.N.A.I.E), 01 BP 1091 Bobo-Dioulasso 01, Bobo Dioulasso, Burkina Faso
4 Ecole Nationale des Eaux et Forêts, Dindéresso, 01 BP 1105 Bobo 01, Bobo Dioulasso, Burkina Faso
5 Institut du Développement Rural, Université Polytechnique de Bobo Dioulasso, Bobo Dioulasso, Burkina Faso
Original language: French
Copyright © 2023 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.
In Burkina Faso, forest areas are losing several hectares of their surface area every year as a result of anthropogenic pressures and climate change. The Kou watershed is no exception to this trend. The aim of this research is to assess the spatio-temporal dynamics of vegetation cover in the Kou watershed using Landsat images. To this end, Landsat TM, Landsat ETM+ and OLI 8 satellite images from September and March (1986 to 2021) were used. Operations on Envi 5.3, field validation output and finally mapping on ArcGIS were the steps. Discrimination was significant, with kappa coefficients of 0.76; 0.79; 0.88 and 0.88. From 1986 to 2001, open forests, gallery forests, wooded and grassy savannahs lost 4.76%, 22.24%, 23.47% and 14.74% of their area respectively. Between 2001 and 2017, the areas of gallery forest (33.53%) and wooded savannah (56.67%) declined. Between 2017 and 2021, wooded and grassy savannahs lost 25.36% and 34.54% of their area respectively. The area occupied by water has decreased considerably over the 35 years. However, during the same period, there has been an increase in areas of annual crops, irrigated crops and habitats. These results highlight the need to develop a sustainable management strategy for the watershed, given its enormous potential.
Author Keywords: agricultural activities, remote sensing, spatial dynamics, Kou watershed, Burkina Faso.
Volume 41, Issue 1, November 2023, Pages 289–299
B. Dembele1, Alain P. K. Gomgnimbou2, J. T. Yameogo3, O. W. Ouedraogo4, and Boalidioa TANKOANO5
1 Université Nazi BONI, Institut du Développement Rural, Laboratoire des Systèmes Naturels, Agrosystèmes et de l’Ingénierie de l’Environnement (Sy.N.A.I.E), 01 BP 1091 Bobo-Dioulasso 01, Bobo Dioulasso, Burkina Faso
2 Laboratoire Sol-Eau-Plante, Programme de Recherche Gestion des Ressources Naturelles et Système de Production, Institut de l’Environnement et de Recherche Agricole, Station de Farako-Bâ, Bobo-Dioulasso, Burkina Faso
3 Université Nazi BONI, Institut du Développement Rural, Laboratoire des Systèmes Naturels, Agrosystèmes et de l’Ingénierie de l’Environnement (Sy.N.A.I.E), 01 BP 1091 Bobo-Dioulasso 01, Bobo Dioulasso, Burkina Faso
4 Ecole Nationale des Eaux et Forêts, Dindéresso, 01 BP 1105 Bobo 01, Bobo Dioulasso, Burkina Faso
5 Institut du Développement Rural, Université Polytechnique de Bobo Dioulasso, Bobo Dioulasso, Burkina Faso
Original language: French
Copyright © 2023 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
In Burkina Faso, forest areas are losing several hectares of their surface area every year as a result of anthropogenic pressures and climate change. The Kou watershed is no exception to this trend. The aim of this research is to assess the spatio-temporal dynamics of vegetation cover in the Kou watershed using Landsat images. To this end, Landsat TM, Landsat ETM+ and OLI 8 satellite images from September and March (1986 to 2021) were used. Operations on Envi 5.3, field validation output and finally mapping on ArcGIS were the steps. Discrimination was significant, with kappa coefficients of 0.76; 0.79; 0.88 and 0.88. From 1986 to 2001, open forests, gallery forests, wooded and grassy savannahs lost 4.76%, 22.24%, 23.47% and 14.74% of their area respectively. Between 2001 and 2017, the areas of gallery forest (33.53%) and wooded savannah (56.67%) declined. Between 2017 and 2021, wooded and grassy savannahs lost 25.36% and 34.54% of their area respectively. The area occupied by water has decreased considerably over the 35 years. However, during the same period, there has been an increase in areas of annual crops, irrigated crops and habitats. These results highlight the need to develop a sustainable management strategy for the watershed, given its enormous potential.
Author Keywords: agricultural activities, remote sensing, spatial dynamics, Kou watershed, Burkina Faso.
Abstract: (french)
Au Burkina Faso, les surfaces forestières perdent plusieurs hectares de leurs étendues chaque année sous l’effet des pressions anthropiques et des changements climatiques. Le Bassin versant du Kou n’est pas en marge de cette situation. L’objectif de cette recherche est d’évaluer la dynamique spatio-temporelle du couvert végétal du Bassin versant du Kou à l’aide des images Landsat. Pour ce faire, des images satellitaires de types Landsat TM, Landsat ETM+ et OLI 8 des mois de Septembre et de Mars ont été utilisées (1986 à 2021). Des opérations sur Envi 5.3, la sortie de validation terrain et enfin la cartographie sur ArcGIS ont été les étapes. La discrimination est significative avec des coefficients de kappa de 0,76 ; 0,79 ; 0,88 et 0,88. De 1986 à 2001 les forêts claires, les forêts galeries, les savanes arborées et herbeuses ont perdu respectivement 4,76%, 22,24%, 23,47% et 14,74% de leur superficie. Entre 2001 et 2017, les superficies des forêts galeries (33,53%), de la savane arborée (56,67%) ont reculé. Entre 2017 et 2021, les savanes arborées et herbeuses ont perdu respectivement 25,36% et 34,54% de leur superficie. Les surfaces occupées par les eaux ont diminué considérablement au cours des 35 ans. Cependant durant la même période, il y a une augmentation des zones de cultures annuelles, cultures irriguées, les habitats. Ces résultats mettent à nu la nécessité d’élaborer une stratégie de gestion durable du bassin versant au vu des potentialités énormes qu’il regorge.
Author Keywords: activités agricoles, télédétection, dynamique spatiale, bassin versant du Kou, Burkina Faso.
How to Cite this Article
B. Dembele, Alain P. K. Gomgnimbou, J. T. Yameogo, O. W. Ouedraogo, and Boalidioa TANKOANO, “Spatial and temporal dynamics of woody cover in the Kou watershed, Burkina Faso,” International Journal of Innovation and Applied Studies, vol. 41, no. 1, pp. 289–299, November 2023.
