부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.agwat.2006.03.010 Byline: Angel Utset (a), Antonio Martinez-Cob (b), Imma Farre (c), Jose Cavero (b) Keywords: Flooding irrigation; Climate variability; Maize water-use; Mechanistic modelling; Weather generator Abstract: The effects of years of extreme rainfall events on maize water-use under traditional flooding irrigation in a Mediterranean landplane were estimated through a simulation assessment; combining a weather generator with an agrohydrological simulation model. Two options: "Fully Irrigation" and "Deficit Irrigation" were considered in the simulations as the extreme water-management situations. Besides, a 2m depth shallow water table and Free Drainage were considered as the typical extreme situations that can be found at the bottom of the simulated soil layer. Thirty "Dry" (DY) and "Wet" (WY) years were randomly selected from the weather generator output. The model SWAP was used to simulate the relative transpiration (RT), i.e. ratio between actual and maximum maize transpiration, actual maize evapotranspiration (ET.sub.C), percolated water and capillary rising during wet and dry years and for each of the irrigation and bottom condition options. According to the modelling results, average mean RT is about 80% and 90% in dry and wet years, respectively. RT and ET.sub.C variability are very high under dry conditions although such variability is notably reduced if a suitable irrigation option is considered. Capillary rising can play a very important role during dry years in those places where irrigation is not enough, but water table is relatively shallower. On the other hand, a shallower water table can carry out RT reductions during wet years, due to water excess, although these negative effects are comparatively lower than those produced by rain scarcity. Besides, percolated water during wet years is very high, particularly in well-irrigated farms. Author Affiliation: (a) Agrarian Technological Institute of Castilla y Leon (ITACYL), Apdo. 172, 47080 Valladolid, Spain (b) Dpto. Genetica y Produccion Vegetal (EEAD), Lab. Asociado Agronomia y Medio Ambiente (DGA-CSIC), Apdo. 202, 50080 Zaragoza, Spain (c) Department of Agriculture Western Australia, 3 Baron-Hay Court, South Perth, WA 6151, Australia Article History: Accepted 17 March 2006