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：1
页码：23-33
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Benjamin Sultan , Christian Baron , Michael Dingkuhn , Benoit Sarr , Serge Janicot Institut de recherche pour le développement (IRD), Laboratoire d’océanographie dynamique et de climat (LODYC), UMR 7617 (CNRS/IRD/P6/MNHN), Université Pierre et Marie Curie, Case 100, 4, place Jussieu, 75252 Paris cedex 05 France, Centre de coopération internationale en recherche agronomique pour le développement (Cirad)–Amis/Agronomie/Ecotrop, TA 40/01, Avenue Agropolis, 34398 Montpellier cedex 5, France, Centre régional de formation et d’application en agrométéorologie, hydrologie et météorologie (AGRHYMET), BP 11011, Niamey Niger Key words: Rainfall, Hydrologie, Climatology, Mousoon, Agriculture, West Africa. Page(s) : 23-33 Published in: 2005 Agriculture in the Sahel, the only region worldwide where food production per capita is decreasing, occupies an important place in governmental policies, and one of the top priorities has become the stabilisation of crop yields. A better understanding of the monsoon cycle in the Sahel is necessary to optimise the use of water resources. A regional study on monsoon dynamics has identified the variability of monsoon onset and the occurrence of dry spells within the rainy season as important determinants. The objective of the present study is to measure the impact of these regional phenomena on local crop yields using SARRAH, a crop model simulating water-limited yield, by means of sensitivity analyses. The response of potential yield (limited by climate but not mineral nutrition) to sowing date was studied for the period 1968-1990 for millet at Niamey. Potential yield variability is analysed with respect to various aspects: the validity of regional (climatic) and local (rainfall events) criteria for sowing dates, the role of inter-annual variability of rains and the impacts of intra-seasonal dry spells. Results indicate that information on regional climate dynamics might help improve crop production locally.
关键词：Rainfall; Hydrologie; Climatology; Mousoon; Agriculture; West Africa.
