Influence des Pressions Anthropiques sur la Dynamique Paysagère de la Reserve Partielle de Faune de Dosso (Niger)
Autor: | Jan Bogaert, Moussa Massaoudou, Tougiani Abasse, Habou Rabiou, Idrissa Kindo Abdou, Idrissa Soumana |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Data source
Spatial structure National park Maximum likelihood 05 social sciences Natural forest Perforation (oil well) 0211 other engineering and technologies 0507 social and economic geography 021107 urban & regional planning Forestry 02 engineering and technology Aire protégée composition configuration fragmentation structure spatiale transformation paysagère Protected area composition configuration fragmentation spatial structure landscape transformation Landscape dynamics Geography Landscape transformation 050703 geography |
Zdroj: | International Journal of Biological and Chemical Sciences; Vol 13, No 2 (2019); 1094-1108 |
ISSN: | 1991-8631 1997-342X |
Popis: | La Reserve Partielle de Faune de Dosso est une aire protegee a statut de zone tampon du parc national du W du Niger. De sa creation (1962) a aujourd’hui, la reserve est devenue l’espace d’accueil des refugies ecologiques (migrants agricoles et eleveurs peulhs) du Niger et des pays limitrophes. Une destruction massive de son potentiel ligneux et faunique a ete observee ces trois decennies, decriees par les gestionnaires forestiers. Cette etude vise a analyser la dynamique du paysage de la reserve couvrant la periode 1986 a 2016. Les images Landsat 5 TM (1986) et Landsat 8 OLI (2016) ont servi de source de donnees pour cette etude. La classification supervisee par maximum de vraisemblance et le calcul d’indices ecologiques ont permis de quantifier la dynamique d’occupation du sol et de detecter les transformations spatiales survenues en 30 ans, au moyen des logiciels ENVI 7.1 et Arcgis 10.2. Les resultats montrent globalement une forte progression des classes d’occupation du sol champs-jacheres et sols nus contre une nette regression des classes de formations forestieres naturelles. Les transformations spatiales en cours sont la fragmentation, la dissection et la perforation des classes de vegetation naturelle. Cette etude a permis de mettre en lumiere les processus de transformation spatiale en cours dans le paysage de la reserve et de determiner les indicateurs d’etat pouvant servir de base a la gestion et a la conservation des ressources forestieres de la reserve de partielle de faune de Dosso au Niger. © 2019 International Formulae Group. All rights reserved Mots cles: Aire protegee, composition, configuration, fragmentation, structure spatiale, transformation paysagere English Title: Influence of Anthropic Pressures on the Landscaping Dynamics of the Partial Reserve of Dosso Fauna (Niger) English Abstract The Dosso Wildlife Reserve is a protected area with buffer zone status in Niger's W National Park. From its creation (1962) to today, the reserve has become the reception area for environmental refugees (agricultural migrants and Fulani pastoralists) from Niger and neighboring countries. A massive destruction of its ligneous and faunal potential has been observed these three decades, decried by the forest managers. This study aims to analyze the landscape dynamics of the reserve covering the period 1986 to 2016. The Landsat 5 TM (1986) and Landsat 8 OLI (2016) images served as a data source for this study. Maximum likelihood-based classification and ecological index computation were used to quantify land cover dynamics and to detect spatial transformations over 30 years using ENVI 7.1 and Arcgis 10.2 software. Overall, the results show a sharp increase in land-fallow and bare soil occupation classes against a clear regression of the natural forest formation classes. The spatial transformations in progress are fragmentation, dissection and perforation of the vegetation classes natural. This study shed light on the spatial transformation processes underway in the reserve landscape and to determine the state indicators that can be used as a basis for the management and conservation of the forest resources of the partial wildlife reserve from Dosso to Niger. © 2019 International Formulae Group. All rights reserved Keywords: Protected area, composition, configuration, fragmentation, spatial structure, landscape transformation |
Databáze: | OpenAIRE |
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