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：269-275
出版社：John Libbey Eurotext
摘要：Authors Jean-Marie Karimou Ambouta , Christian Valentin , Marc R. Laverdière Université Abdou-Moumouni de Niamey, BP 10960, Niamey, Niger, Mission ORSTOM, BP 11416, Niamey, Niger, Université Laval, Local 2215, pavillon Comtois, G1K 7P4, Québec, Canada Page(s) : 269-75 Published in: 1996 The effect of surface crusting in the Sahel has been given much attention. However, the influence fallow periods have on this specific phenomenon, and thereby on surface hydrodynamics, has not yet been fully clarified. Studies were conducted on the crusting index in fallows and agricultural sites in the Banizoumbou area, along with analyses to determine the proportions of fine particles of the soil surface. The results provide a more accurate indication as to the impact of fallows on the severity of soil crusting. It was shown that the fallow period promotes erosion-crust formation an extension due to the effects of vegetation regrowth (which traps aeolian dust) and the lack of sortillage. This effect is observed as early as the first year of fallows but then diminishes after 4-7 years (probably because of the renewal of termite activity) ; however, the situation becomes serious again in long-standing fallows. The high erosion crust formation in short and long fallow period increases run off and soil erosion throughout the catchment area.
