Show simple item record

resumen

Abstract
Understanding nitrogen (N) exchange between cultivated ecosystems and groundwater becomes crucial in the Rolling Pampas where high and variable water table levels are accompanied by increasing N-fertilization rates. Field monitoring of crops, soils and groundwater was combined with modeling to evaluate bidirectional flows (from terrestrial ecosystems to aquifers and vice versa) of water and N throughout a 10-year period (1998–2007) of highly variable [ver mas...]
dc.contributor.authorPortela, Silvina Isabel
dc.contributor.authorAndriulo, Adrian Enrique
dc.contributor.authorJobbagy, Esteban G.
dc.contributor.authorSasal, Maria Carolina
dc.date.accessioned2020-04-30T13:04:04Z
dc.date.available2020-04-30T13:04:04Z
dc.date.issued2009-12
dc.identifier.issn0167-8809
dc.identifier.otherhttps://doi.org/10.1016/j.agee.2009.08.001
dc.identifier.urihttp://hdl.handle.net/20.500.12123/7177
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0167880909002291
dc.description.abstractUnderstanding nitrogen (N) exchange between cultivated ecosystems and groundwater becomes crucial in the Rolling Pampas where high and variable water table levels are accompanied by increasing N-fertilization rates. Field monitoring of crops, soils and groundwater was combined with modeling to evaluate bidirectional flows (from terrestrial ecosystems to aquifers and vice versa) of water and N throughout a 10-year period (1998–2007) of highly variable precipitation (760–1506 mm year−1) and water table depths (6.5 to <1 m). Piezometers at three topographic positions (upland: UP, mid slope: MS, and toe slope: TS; 1740 and 510 m apart) were used to monitor water table depth and phreatic (<14 m), intermediate (35 m) and bottom of the aquifer (45 m) water chemistry. Crop production and soil water and nitrate content were monitored in two agricultural plots (wheat/soybean–corn rotation) where MS and TS piezometers were located. Nitrate concentration in phreatic groundwater was relatively stable and low at UP and MS (<10 mg l−1) but increased sharply at TS (>45 mg l−1) during periods of high water table levels (<3 m deep). Groundwater chloride concentrations increased with depth in piezometers at UP and MS, but showed the opposite trend at TS during periods of high water table levels, suggesting evaporative discharge at this position. The lateral hydraulic gradient (moving energy) between MS and TS ranged from −0.1 to 0.4% and was negatively correlated with water table depth at TS (R2 = 0.23, p < 0.001, n = 79) indicating that groundwater flow towards TS increased as the water table level rose. A capillary transport model (UPFLOW) suggested that at TS groundwater supplied an important amount of water and solutes to crops with corn obtaining approximately half of its water needs (228–413 mm) and one fourth of its N requirement (38–76 kg ha−1) from groundwater. Water and N supply from groundwater may have explained the higher biomass and grain yield in the lower positions of each plot with regard to the rest of the area. Our results suggest that the Rolling Pampas landscapes can switch from a typical recharge behavior to a recharge–discharge one following extended rainy periods that rise water table levels and hydraulic gradients, favoring water and solute transport towards the lower positions of the landscape and local concentration of solutes by groundwater consumption, simultaneously affecting groundwater quality.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceAgriculture, Ecosystems and Environment 134 (3,4) : 277–286. (December 2009)es_AR
dc.subjectHidrologíaes_AR
dc.subjectHydrologyeng
dc.subjectAguas Subterráneases_AR
dc.subjectGroundwatereng
dc.subjectEvaporaciónes_AR
dc.subjectEvaporationeng
dc.subjectAcuíferoes_AR
dc.subjectAquiferseng
dc.subjectNitrógenoes_AR
dc.subjectNitrogeneng
dc.subject.otherEvaporative Dischargeeng
dc.subject.otherNitrate leachingeng
dc.subject.otherRegión Pampa Ondulada
dc.titleWater and nitrate exchange between cultivated ecosystems and groundwater in the Rolling Pampases_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Pergaminoes_AR
dc.description.filFil: Portela, Silvina Isabel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Laboratorio de Suelos; Argentinaes_AR
dc.description.filFil: Andriulo, Adrián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Pergamino. Departamento de Laboratorio de Suelo; Argentinaes_AR
dc.description.filFil: Jobbágy, Esteban G. Universidad Nacional de San Luis. Instituto de Matemática Aplicada San Luis. Grupo de Estudios Ambientales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Argentinaes_AR
dc.description.filFil: Sasal, María Carolina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentinaes_AR
dc.subtypecientifico


Files in this item

Thumbnail

This item appears in the following Collection(s)

common

Show simple item record