期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2011
卷号：22
期号：2
页码：108-116
DOI：10.1684/sec.2011.0305
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Maman Maârouhi Inoussa , Ali Mahamane , Cheikh Mbow , Mahamane Saadou , Bachmann Yvonne Université Abdou Moumouni de Niamey Faculté des sciences Département de biologie Laboratoire Garba Mounkaila BP 10662 227 Niamey Niger, Université de Maradi Faculté des sciences BP 465 227 Maradi Niger, Université Cheikh Anta Diop de Dakar (Ucad) Institut des sciences de l’environnement (ISE) Laboratoire d’enseignement et de recherche en géomatique (LERG) Avenue Cheikh Anta Diop BP 5005 Dakar Fann Sénégal, Institute of Ecology, Evolution and Diversity Siesmayerstr. 70 60323 Frankfurt Germany Key words: forestry, land use, Niger, satellite imaging, vegetation dynamics DOI : 10.1684/sec.2011.0305 Page(s) : 108-16 Published in: 2011 This paper is an assessment of the woodland dynamics in protected dryland ecosystems. The study was conducted in the W National Park of Niger, which belongs to the W Regional Park of Niger located in West Africa. The databases used are composed of two Landsat images TM and ETM + of November 1984 and November 2002, respectively. For each image a supervised classification using maximum likelihood was applied followed by a post classification to eliminate isolated pixels. During the classification some verification tests were performed on the basis of reference data collected in the study area. Two land cover maps of 1984 and 2002 were made, with 9 thematic classes identified. The dynamics of change shows a short increase of woodland from 1 % of the study area in 1984 to 2.7 % in 2002. Spatial landscape dynamics analysis has revealed a process of woodland land cover creation. This process assumes the landscape fragmentation in the study area, which can influence the biodiversity conservation in this protected area.
关键词：forestry; land use; Niger; satellite imaging; vegetation dynamics
