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dc.contributor.author
Jayawickreme, Dushmantha
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Santoni, Celina Sofia
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Kim, John H.
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Jobbagy Gampel, Esteban Gabriel
dc.contributor.author
Jackson, Robert B.
dc.date.available
2017-04-20T20:55:04Z
dc.date.issued
2011-10
dc.identifier.citation
Jayawickreme, Dushmantha; Santoni, Celina Sofia; Kim, John H.; Jobbagy Gampel, Esteban Gabriel; Jackson, Robert B.; Changes in hydrology and salinity accompanying a century of agricultural conversion in Argentina; Ecological Society of America; Ecological Applications; 21; 7; 10-2011; 2367-2379
dc.identifier.issn
1051-0761
dc.identifier.uri
http://hdl.handle.net/11336/15530
dc.description.abstract
Conversions of natural woodlands to agriculture can alter the hydrologic balance, aquifer recharge, and salinity of soils and groundwater in ways that influence productivity and sustainable land use. Using a land-use change chronosequence in semiarid woodlands of Argentina's Espinal province, we examined the distribution of moisture and solutes and estimated recharge rates on adjacent plots of native woodlands and rain-fed agriculture converted 6–90 years previously. Soil coring and geoelectrical profiling confirmed the presence of spatially extensive salt accumulations in dry woodlands and pervasive salt losses in areas converted to agriculture. A 1.1-km-long electrical resistivity transect traversing woodland, 70-year-old agriculture, and woodland, for instance, revealed a low-resistivity (high-salinity) horizon between ∼3 m and 13 m depth in the woodlands that was virtually absent in the agricultural site because of leaching. Nine-meter-deep soil profiles indicated a 53% increase in soil water storage after 30 or more years of cultivation. Conservative groundwater-recharge estimates based on chloride tracer methods in agricultural plots ranged from ∼12 to 45 mm/yr, a substantial increase from the <1 mm/yr recharge in dry woodlands. The onset of deep soil moisture drainage and increased recharge led to >95% loss of sulfate and chloride ions from the shallow vadose zone in most agriculture plots. These losses correspond to over 100 Mg of sulfate and chloride salts potentially released to the region's groundwater aquifers through time with each hectare of deforestation, including a capacity to increase groundwater salinity to >4000 mg/L from these ions alone. Similarities between our findings and those of the dryland salinity problems of deforested woodlands in Australia suggest an important warning about the potential ecohydrological risks brought by the current wave of deforestation in the Espinal and other regions of South America and the world.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Ecological Society of America
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Agriculture
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Deforestation
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Ecohydrology
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Espinal Province
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Argentina
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Groundwater Recharge
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Land Use Change
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Salinity
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Salt Leaching
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Semiarid Regions
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Soil Resistivity Imaging
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South America
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Ecología
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Ciencias Biológicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Changes in hydrology and salinity accompanying a century of agricultural conversion in Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-04-18T14:26:02Z
dc.identifier.eissn
1939-5582
dc.journal.volume
21
dc.journal.number
7
dc.journal.pagination
2367-2379
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Jayawickreme, Dushmantha. University Of Duke; Estados Unidos
dc.description.fil
Fil: Santoni, Celina Sofia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis ; Argentina
dc.description.fil
Fil: Kim, John H.. University Of Duke; Estados Unidos
dc.description.fil
Fil: Jobbagy Gampel, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis ; Argentina
dc.description.fil
Fil: Jackson, Robert B.. University Of Duke; Estados Unidos
dc.journal.title
Ecological Applications
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1890/10-2086.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1890/10-2086.1/abstract
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