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：1996
卷号：7
期号：4
页码：287-297
出版社：John Libbey Eurotext
摘要：Author Pierre Rognon Université Pierre-et-Marie-Curie 4, place Jussieu 75005 Paris, France. Page(s) : 287-97 Published in: 1996 The international convention on desertification encourages reflexion on climatic and socioeconomic causes of desertification. Aridity is one threatening factor - promoting salinization, soil degradation, wind erosion, etc. The problem is that aridity is dependent on the rate of evaporation, a long-ignored and complex climatic factor, and is thus difficult to measure. Drought, defined as a prolonged water deficit (relative to mean or median levels), can have a direct impact on desertification, especially when it persists for several years. Many questions arise with respect to accurately defining a dry season or year, spatially and temporally pinpointing droughts, and objectively assessing the economic impacts of droughts.
