[ IMAGERIE SATELLITAIRE ET MODELISATION DU COUVERT FORESTIER : CAS DU MASSIF DE ZOUZOUNKAN DANS LA ZONE DE TRANSITION ENTRE LE CRISTALLIN ET LE SEDIMENTAIRE AU BENIN ]
Volume 1, Issue 1, April 2014, Pages 9–19
E. Brice SOHOU1, Orekan Vincent2, C. HOUNDENOU3, and Michel BOKO4
1 Laboratoire de sécurité sanitaire, d'expertises et analyses. Institut Régional du génie industriel des Biotechnologies et Sciences Appliquées (IRGIB Africa), Benin
2 Department, Biodiversity and Environmental Expertise Laboratory, University of Abomey-Calavi, BP: 677 Abomey Calavi, Benin
3 Prof Titulaire (CAMES) Laboratoire de Climatologie Pierre Pagney / FLASH / UAC, Benin
4 Laboratoire de SIG appliqués à l'épidémiologie, à l'environnement et aux sciences de la terre, Benin
Original language: French
Copyright © 2014 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.
Zouzounkan massive is one of southern Benin forests whose management is done communally in the transition zone between the crystalline basement and the sedimentary soil. The present study is an application of satellite imagery and statistical modeling to the assessment of Zouzounkan forest cover states since the year 1990 to 2010 . It appears that there is a negative correlation between bare soil and vegetation massif Zouzounkan (-0.74 to clear forests and woodlands and -0.33 for tree and shrub savanna) . The mosaics of crops and fallow induce a negative correlation of -0.29 to clear forests and woodlands. Soil erosion leads to turn a negative correlation of -0.11 with tree and shrub savannah. 2 linear state functions were achieved through factor analysis on the basis of two factorial axes explaining 100% of the variance. The factorial axis 1 is materialized by a linear function f(x) = 0,997 Se + 0,969 FcSb + 0,960 Ma - 0,865 Sd - 0,778 Shs - 0,521 Mcj ; where Se = Soils altered by erosion; fcsb = Clear forest and savanna woodland ; Ma = Wetlands ; Sd = bare floors ; Shs = Savanna Grassland ; Mcj = mosaics of crops and fallow. The factorial axis 2 is represented by F(x) = 0,24 FcSb -0,983 Saa + 0,854 ; With Saa = tree and shrub Savannah. Frome the diagram of components in space after rotation, we deduce that the increase 0.865 units of bare floors or 0.521 units mosaics of crops and fallow causes a degradation of 0.969 units of woodland and savanna Woodland. Urgent mesures of reforestation, erosion control and forest eve well-organized are essential for the sustainability of massive Zouzounkan agroecosystems.
Author Keywords: Massive, Zouzounkan, satellite imagery, statistical modeling, negative correlation.
Volume 1, Issue 1, April 2014, Pages 9–19
E. Brice SOHOU1, Orekan Vincent2, C. HOUNDENOU3, and Michel BOKO4
1 Laboratoire de sécurité sanitaire, d'expertises et analyses. Institut Régional du génie industriel des Biotechnologies et Sciences Appliquées (IRGIB Africa), Benin
2 Department, Biodiversity and Environmental Expertise Laboratory, University of Abomey-Calavi, BP: 677 Abomey Calavi, Benin
3 Prof Titulaire (CAMES) Laboratoire de Climatologie Pierre Pagney / FLASH / UAC, Benin
4 Laboratoire de SIG appliqués à l'épidémiologie, à l'environnement et aux sciences de la terre, Benin
Original language: French
Copyright © 2014 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
Zouzounkan massive is one of southern Benin forests whose management is done communally in the transition zone between the crystalline basement and the sedimentary soil. The present study is an application of satellite imagery and statistical modeling to the assessment of Zouzounkan forest cover states since the year 1990 to 2010 . It appears that there is a negative correlation between bare soil and vegetation massif Zouzounkan (-0.74 to clear forests and woodlands and -0.33 for tree and shrub savanna) . The mosaics of crops and fallow induce a negative correlation of -0.29 to clear forests and woodlands. Soil erosion leads to turn a negative correlation of -0.11 with tree and shrub savannah. 2 linear state functions were achieved through factor analysis on the basis of two factorial axes explaining 100% of the variance. The factorial axis 1 is materialized by a linear function f(x) = 0,997 Se + 0,969 FcSb + 0,960 Ma - 0,865 Sd - 0,778 Shs - 0,521 Mcj ; where Se = Soils altered by erosion; fcsb = Clear forest and savanna woodland ; Ma = Wetlands ; Sd = bare floors ; Shs = Savanna Grassland ; Mcj = mosaics of crops and fallow. The factorial axis 2 is represented by F(x) = 0,24 FcSb -0,983 Saa + 0,854 ; With Saa = tree and shrub Savannah. Frome the diagram of components in space after rotation, we deduce that the increase 0.865 units of bare floors or 0.521 units mosaics of crops and fallow causes a degradation of 0.969 units of woodland and savanna Woodland. Urgent mesures of reforestation, erosion control and forest eve well-organized are essential for the sustainability of massive Zouzounkan agroecosystems.
Author Keywords: Massive, Zouzounkan, satellite imagery, statistical modeling, negative correlation.
Abstract: (french)
Le massif de Zouzounkan est l'un des massifs forestiers du sud Bénin dont la gestion se fait de façon communautaire en pleine zone de transition entre le socle cristallin et le sol sédimentaire. La présente étude constitue une application de l'imagerie satellitaire et de la modélisation statistique à l'évaluation des états du couvert forestier de Zouzounkan de l'année 1990 à 2010. Il ressort l'existence d'une corrélation négative entre les sols dénudés et les formations végétales du massif de Zouzounkan (-0,74 pour les forêts claires et savanes boisées et -0,33 pour les savanes arborées et arbustives). Les mosaïques de cultures et jachères induisent une corrélation négative de -0,29 aux forêts claires et savanes boisées. L'érosion des sols entraine à son tour une corrélation négative de -0,11 aux savanes arborées et arbustives. 2 fonctions linéaires d'état du massif ont été réalisées grâce à l'analyse factorielle sur la base de deux axes factoriels expliquant 100% de la variance. L'axe factoriel 1 se matérialise par une fonction linéaire f(x) = 0,997 Se + 0,969 FcSb + 0,960 Ma - 0,865 Sd - 0,778 Shs - 0,521 Mcj ; où Se = Sols altérés par l'érosion ; FcSb = Forêt claire et savane boisée ; Ma = Marécages ; Sd = Sols dénudés ; Shs = Savane herbeuse et saxicole. L'axe factoriel 2 est matérialisé par F(x) = 0,24 FcSb -0,983 Saa + 0,854; avec Saa = Savane arborée et arbustive. Du diagramme des composantes dans l'espace après rotation, on déduit que l'augmentation de 0,865 unités des Sols dénudés ou de 0,521 unités des mosaïques de cultures et jachères entraine une dégradation de 0,969 unités des forêts claires et savanes boisées. Il urge des mesures de reboisement, d'aménagement antiérosif et de veilles forestières bien organisées pour la pérennité des agroécosystèmes du massif de Zouzounkan.
Author Keywords: Massif, Zouzounkan, imagerie satellitaire, modélisation statistique, corrélation négative.
How to Cite this Article
E. Brice SOHOU, Orekan Vincent, C. HOUNDENOU, and Michel BOKO, “SATELLITE IMAGING AND FOREST COVER MODELING : CASE OF ZOUZOUNKAN MASSIVE IN THE TRANSITION ZONE BETWEEN CRYSTAL AND SEDIMENTARY SOIL IN BENIN,” International Journal of Innovation and Scientific Research, vol. 1, no. 1, pp. 9–19, April 2014.
