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Artículo

Livestock stations as foci of groundwater recharge and nitrate leaching in a sandy desert of the Central Monte, Argentina

Meglioli, Pablo AndrésIcon ; Aranibar, Julieta NelidaIcon ; Villagra, Pablo EugenioIcon ; Alvarez, Juan AgustinIcon ; Jobbagy Gampel, Esteban GabrielIcon
Fecha de publicación: 04/2014
Editorial: Wiley
Revista: Ecohydrology
ISSN: 1936-0584
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ecología

Resumen

In arid ecosystems, evapotranspiration generally exceeds precipitation, preventing deep drainage and groundwater recharge. We propose that vegetation changes associated with the establishment of pastoralist settlements (i.e. livestock stations) can disrupt the ecological and hydrological linkages in arid groundwater-coupled ecosystems of the Monte desert (Argentina), allowing local groundwater recharge and nitrate leaching to the aquifer, affecting groundwater quality. We tested this hypothesis by analysing vegetation, land use indicators, water and nitrate dynamics in three pairs of livestock stations and relatively undisturbed control woodlands. Livestock stations had lower vegetation and dead wood but higher dung covers than control woodlands, indicating soil and vegetation changes associated to land use. Water and nitrate dynamics were also affected by land use. Soil nitrate and water contents sampled down to the water table were higher, and soil chloride and salinity were lower in livestock stations, indicating higher water percolation and N input/transport rates. Higher groundwater nitrate concentrations in livestock stations indicate that these areas behave as foci of N and water export from ecosystems to the phreatic aquifer. Our study supports the idea that vegetation in arid areas prevents downward surface–groundwater interactions, but it also indicates that human modifications of vegetation disrupt this control, reducing soil water consumption and allowing vertical movement of water and solutes to the aquifer, which can modify groundwater quality. Disruptions of ecological processes by livestock activities clearly affect the hydrological links between surface and groundwater
Palabras clave: Land Use Changes , Prosopis Flexuosa Woolands , Grazing Systems , Shallow Groundwater
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/5749
URL: http://onlinelibrary.wiley.com/doi/10.1002/eco.1381/abstract
DOI: http://dx.doi.org/10.1002/eco.1381
DOI: http://dx.doi.org/ 10.1002/eco.1381
Colecciones
Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Articulos(IMASL)
Articulos de INST. DE MATEMATICA APLICADA DE SAN LUIS
Citación
Meglioli, Pablo Andrés; Aranibar, Julieta Nelida; Villagra, Pablo Eugenio; Alvarez, Juan Agustin; Jobbagy Gampel, Esteban Gabriel; Livestock stations as foci of groundwater recharge and nitrate leaching in a sandy desert of the Central Monte, Argentina; Wiley; Ecohydrology; 7; 4-2014; 600-611
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