Shallow groundwater dynamics in the Pampas climate, landscape and crop choice effects
Depending on its depth from the soil surface, shallow groundwater can represent a valuable waterresource to alleviate droughts, or a stress agent that causes waterlogging and flooding in rainfed crops. Groundwater depth varies across space, following landscape topographic features; through time, acc...
| Otros Autores: | , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2016mercau.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 022 | |a 0378-3774 | ||
| 024 | |a 10.1016/j.agwat.2015.09.013 | ||
| 040 | |a AR-BaUFA |c AR-BaUFA | ||
| 245 | 1 | 0 | |a Shallow groundwater dynamics in the Pampas |b climate, landscape and crop choice effects |
| 520 | |a Depending on its depth from the soil surface, shallow groundwater can represent a valuable waterresource to alleviate droughts, or a stress agent that causes waterlogging and flooding in rainfed crops. Groundwater depth varies across space, following landscape topographic features; through time, accom-panying climate fluctuations; and may also shift in both dimensions in response to crop choice. evaluated the contribution of climate, topography and crop choice on the variability of groundwater depthin rainfed systems of western Pampas, throughout a five year period of extreme precipitation fluctuation[2008-2013]. Sixteen permanent monitoring wells were installed in four different topographic settingsalong the smoothly rolling landscape, covering the three phases of a maize-soybean-wheat-soybeanrotation, common in the region. Water table dynamics, measured at weekly to monthly intervals, wasvery similar across landscape positions, with a range of depth from the surface of -0.2 [flood] to 1.8 mand 1.8-4.4 m in the lowest and highest positions, respectively. At the inter-annual scale, water tablefluctuations were predominantly dictated by climate variability with no effect due to the implantedcrop. Only at the intra-annual scale, crop choice appeared as a relevant control, with wheat-soybeanflattening the spring level rises and summer drops repeatedly found under maize and soybean singlecrops. Daily meteorological data and remote sensing estimates of live and dead crop cover were usedto simulate transpiration demand and soil evaporation. As the balance between precipitation and cropevapotranspiration was positive-negative, watertables raised-dropped 0.21 cm mm-1[n = 80, R20.32] and0.22 cm mm-1[n = 1092, R20.31] at inter and intra-annual scales, respectively. While crop choice mayinfluence water table levels within a growing season, it has only a subtle effect on year to year fluctuation. With the explored annual crop options, farmers in the Pampas could reduce spring flooding risk whensowing double crops but cannot have a substantial effect on the longer term dynamics of the water table. | ||
| 653 | 0 | |a WATER TABLE DEPTH | |
| 653 | 0 | |a ECOHYDROLOGY | |
| 653 | 0 | |a ANNUAL CROPS | |
| 653 | 0 | |a FARMING | |
| 653 | 0 | |a ARGENTINA | |
| 700 | |a Mercau, Jorge Luis |9 8200 | ||
| 700 | 1 | |a Nosetto, Marcelo Daniel |9 27095 | |
| 700 | 1 | |a Bert, Federico E. |9 12448 | |
| 700 | 1 | |9 24043 |a Giménez, Raúl Alberto | |
| 700 | 1 | |a Jobbágy Gampel, Esteban Gabriel |9 49575 | |
| 773 | |t Agricultural Water Management |g vol.163 (2016), p.159-168, grafs., tbls. | ||
| 856 | |u http://ri.agro.uba.ar/files/intranet/articulo/2016mercau.pdf |q application/pdf |f 2016mercau |x MIGRADOS2018 | ||
| 856 | |u https://www.elsevier.com |x MIGRADOS2018 |z LINK AL EDITOR | ||
| 942 | 0 | 0 | |c ARTICULO |
| 942 | 0 | 0 | |c ENLINEA |
| 976 | |a AAG | ||