标题：Determination of the bioclimatic aridity of seven localities in the province of Tillabéri (South Western part of Niger) and their distribution into bioclimatic zones
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：2005
卷号：16
期号：2
页码：107-114
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Larwanou Mahamane , Saadou Mahamane , André Nonguierma Institut national de la recherche agronomique du Niger (Inran), Département de gestion des ressources naturelles, BP 429, Niamey, Niger, Département de biologie végétale, Université Abdou Moumouni de Niamey, BP 10662, Niamey, Niger, Centre régional AGRHYMET, BP 11011, Niamey, Niger Key words: Bioclimatolgy, Aridity, Indicators, Niger Page(s) : 107-14 Published in: 2005 A study aimed at determining the bioclimatic aridity gradient of seven localities in the Province of Tillabéri (South Western part of Niger) was carried out in order to distribute these localities into bioclimatic zones. A set of climatic data spreading over thirty years (1970-1999), coupled with biophysical information on this region was used. As a result of this investigation, two distinct bioclimatic zones were identified with an intermediary one in-between. The bioclimatic zones are: a semi-arid zone with an aridity degree ranging from 0.21 to 0.19, and comprising the localities of Say, Kollo, and Niamey; an arid zone with an aridity index of 0.17 to 0.15, and containing the localities of Tillabéri, Ouallam, and Filingué. With an aridity index of 0.17, Téra was considered as an intermediary zone. This study provides an insight into the degree of climatic vulnerability of theses localities taken individually and collectively.
