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dc.contributor.authorDarwiche-Criado, Nadia-
dc.contributor.authorComín, Francisco A.-
dc.contributor.authorSorando, Ricardo-
dc.contributor.authorSánchez-Pérez, José Miguel-
dc.identifierdoi: 10.1016/j.agee.2014.11.002-
dc.identifierissn: 0167-8809-
dc.identifier.citationAgriculture, Ecosystems and Environment 200: 208-218 (2015)-
dc.description.abstract© 2014 Elsevier B.V. The temporal variability, hysteresis loops and various factors involved in the mobilization of nitrates (NO3 -) have been studied for a 3-year period at the Flumen River basin. Multivariate techniques (cluster analysis and pearson correlation matrix) were used to establish the relationship between the water discharge and NO3 - flushing, as well as to identify the agricultural and hydrometeorological parameters that influence its different mobilization trends. The relationship between changes in the NO3 - concentration (δC) and the overall dynamic of each hysteresis loop (δR) was also analyzed in order to describe the NO3 - trends according to the water discharge. A general dilution pattern of the NO3 - concentration was noted in the Flumen River with respect to the degree of water discharge caused by irrigation return flows. While fertilization increased the NO3 - concentration, the beginning of the irrigation season contributed to its dilution. However, in case of the NO3 - load, the maximum values occurred during high flow periods in the irrigation period, which suggested the influence of the irrigation flow on the NO3 - mass. The NO3 - load increased to 2753t and 1059t during the first and second phases of the study period, respectively, with an average specific yield of 1.33tkm-2 y-1. The NO3 - transport in the first phase of the study was 1722t during the irrigation season and 1031t during the non-irrigation period. Only 348t (13%) of NO3 - was exported during the flood events. However, in the course of the second phase of the study, the NO3 - load was 733t during the irrigation season and 326t during the non-irrigation period. In this case, 610t (57%) of nitrate was transported during the floods. These results revealed the clear influence of irrigation return flows on the NO3 - response in Flumen River.-
dc.description.sponsorshipThis study was part of the AGUAFLASH project funded by theEU Interreg IV B SUDOE Programme (SOE1/P2/F146), which is financed by EU FEDER and has been supported by European Project LIFE09 ENV/ES/000431CREAMAgua too. We also wish to acknowledge the Instituto de Estudios Altoaragoneses grant used to develop part of this work. We thank the Agencia Estatal de Meteorología (AEMET), the Oficina del Regante del Gobierno de Aragón and the Comarca de los Monegros-Aragón for their collaboration and data contribution. Thanks to M. Garcia and A. Barcos for their assistance in laboratory tasks and to S.G. Eisman for her essential help in field work and her contribution with her useful ideas.-
dc.subjectNitrate transport-
dc.subjectIrrigation return flows-
dc.subjectFlood events-
dc.subjectAgricultural practices-
dc.titleSeasonal variability of NO3 - mobilization during flood events in a Mediterranean catchment: The influence of intensive agricultural irrigation-
dc.description.versionPeer Reviewed-
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