Salt leaching leads to drier soils in disturbed semiarid woodlands of central Argentina

Disturbances in semiarid environments have revealed a strong connection between water, salt and vegetation dynamics highlighting how the alteration of water fluxes can drive salt redistribution process and long-term environmental degradation. Here, we explore to what extent the reciprocal effect, th...

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Detalles Bibliográficos
Autor principal: Marchesini, Victoria A.
Otros Autores: Fernández, Roberto Javier, Jobbágy, Esteban G.
Formato: Artículo
Lenguaje:Inglés
Materias:
CHLORIDE
OSMOTIC AND MATRIC POTENTIAL
SALT AND WATER DYNAMICS
SELECTIVE DEFORESTATION
WOODY VEGETATION
WATER
DEFORESTATION
DISTURBANCE
GROWING SEASON
MATRIC POTENTIAL
OSMOSIS
SALT
SEMIARID REGION
SHRUB
VEGETATION DYNAMICS
WOODLAND
ANALYSIS OF VARIANCE
ARGENTINA
BIOLOGICAL MODEL
BIOTA
ECOSYSTEM
ELECTRIC CONDUCTIVITY
HUMIDITY
SALINITY
SOIL
WATER FLOW
CHLORIDES
MODELS, BIOLOGICAL
WATER MOVEMENTS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2013marchesini.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 0 0 |a Salt leaching leads to drier soils in disturbed semiarid woodlands of central Argentina 
520 |a Disturbances in semiarid environments have revealed a strong connection between water, salt and vegetation dynamics highlighting how the alteration of water fluxes can drive salt redistribution process and long-term environmental degradation. Here, we explore to what extent the reciprocal effect, that of salt redistribution on water fluxes, may play a role in dictating environmental changes following disturbance in dry woodlands. We assessed salt and water dynamics comparing soil-solution electrical conductivity, chloride concentration, soil water content [SWC] and soil matric and osmotic water potential [psi m, psi os] between disturbed and undisturbed areas. A large pool of salts and chlorides present in undisturbed areas was absent in disturbed plots, suggesting deep leaching. Unexpectedly, this was associated with slight but consistently lower SWC in disturbed versus undisturbed situations during two growing seasons. The apparent paradox of increased leaching but diminishing SWC after disturbance can be explained by the effect of native salt lowering Ψos enough to prevent full soil drying. Under disturbed conditions, the onset of deep drainage and salt leaching would raise Ψos allowing a decline of Ψm and SWC. Soil water storage seems to be modulated by the presence [under natural conditions] and partial leaching [following selective shrub disturbance] of large salt pools. This counterintuitive effect of disturbances may be important in semiarid regions where deep soil salt accumulation is a common feature. Our results highlight the importance of water-salt-vegetation coupling for the understanding and management of these systems. 
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700 1 |9 6385  |a Fernández, Roberto Javier 
700 1 |a Jobbágy, Esteban G.  |9 7390 
773 |t Oecologia  |g vol.171, no.4 (2013), p.1003-1012 
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900 |a ^aFernández, R.J.^tIFEVA-CONICET/Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
900 |a ^aJobbágy, E.G.^tGrupo de Estudios Ambientales, IMASL-CONICET and Universidad de San Luis, San Luis, Argentina 
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900 |a WOODY VEGETATION 
900 |a WATER 
900 |a DEFORESTATION 
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900 |a Disturbances in semiarid environments have revealed a strong connection between water, salt and vegetation dynamics highlighting how the alteration of water fluxes can drive salt redistribution process and long-term environmental degradation. Here, we explore to what extent the reciprocal effect, that of salt redistribution on water fluxes, may play a role in dictating environmental changes following disturbance in dry woodlands. We assessed salt and water dynamics comparing soil-solution electrical conductivity, chloride concentration, soil water content [SWC] and soil matric and osmotic water potential [psi m, psi os] between disturbed and undisturbed areas. A large pool of salts and chlorides present in undisturbed areas was absent in disturbed plots, suggesting deep leaching. Unexpectedly, this was associated with slight but consistently lower SWC in disturbed versus undisturbed situations during two growing seasons. The apparent paradox of increased leaching but diminishing SWC after disturbance can be explained by the effect of native salt lowering Ψos enough to prevent full soil drying. Under disturbed conditions, the onset of deep drainage and salt leaching would raise Ψos allowing a decline of Ψm and SWC. Soil water storage seems to be modulated by the presence [under natural conditions] and partial leaching [following selective shrub disturbance] of large salt pools. This counterintuitive effect of disturbances may be important in semiarid regions where deep soil salt accumulation is a common feature. Our results highlight the importance of water-salt-vegetation coupling for the understanding and management of these systems. 
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