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dc.contributor.author
Jobbagy Gampel, Esteban Gabriel  
dc.contributor.author
Nosetto, Marcelo Daniel  
dc.contributor.author
Villagra, Pablo Eugenio  
dc.contributor.author
Jackson, Robert B.  
dc.date.available
2017-04-20T22:06:31Z  
dc.date.issued
2011-04  
dc.identifier.citation
Jobbagy Gampel, Esteban Gabriel; Nosetto, Marcelo Daniel; Villagra, Pablo Eugenio; Jackson, Robert B.; Water subsidies from mountains to deserts: their role in sustaining groundwater-fed oases in a sandy landscape; Ecological Society of America; Ecological Applications; 21; 3; 4-2011; 678-694  
dc.identifier.issn
1051-0761  
dc.identifier.uri
http://hdl.handle.net/11336/15538  
dc.description.abstract
In arid regions throughout the world, shallow phreatic aquifers feed natural oases of much higher productivity than would be expected solely from local rainfall. In South America, the presence of well-developed Prosopis flexuosa woodlands in the Monte Desert region east of the Andes has puzzled scientists for decades. Today these woodlands provide crucial subsistence to local populations, including descendants of the indigenous Huarpes. We explore the vulnerability and importance of phreatic groundwater for the productivity of the region, comparing the contributions of local rainfall to that of remote mountain recharge that is increasingly being diverted for irrigated agriculture before it reaches the desert. We combined deep soil coring, plant measurements, direct water-table observations, and stable-isotopic analyses (2H and 18O) of meteoric, surface, and ground waters at three study sites across the region, comparing woodland stands, bare dunes, and surrounding shrublands. The isotopic composition of phreatic groundwaters (delta2H: -137 per thousand +/- 5 per thousand) closely matched the signature of water brought to the region by the Mendoza River (-137 per thousand +/- 6 per thousand), suggestin that mountain-river infiltration rather than in situ rainfall deep drainage (-39 per thousand +/- 19 per thousand) was the dominant mechanism of recharge. Similarly, chloride mass balances determined from deep soil profiles (> 6 m) suggested very low recharge rates. Vegetation in woodland ecosystems, where significant groundwater discharge losses, likely >100 mm/yr occurred, relied on regionally derived groundwater located from 6.5 to 9.5 m underground. At these locations, daily water-table fluctuations of 10 mm, and stable-isotopic measurements of plant water, indicated groundwater uptake rates of 200-300 mm/yr. Regional scaling suggests that groundwater evapotranspiration reaches 18-42 mm/yr across the landscape, accounting for 7 17% of the Mendoza River flow regionally. Our study highlights the reliance of ecosystem productivity in natural oases on Andean snowmelt, which is increasingly being diverted to one of the largest irrigated regions of the continent. Understanding the ecohydrological coupling of mountain and desert ecosystems here and elsewhere should help managers balance production agriculture and conservation of unique woodland ecosystems and the rural communities that rely on them.  
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
Algarrobo Woodlands  
dc.subject
Arid Oasis  
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Central Monte Desert  
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Western Argentina  
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Cordillera de Los Andes  
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Groundwater Recharge/Discharge  
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Larrea Shrublands  
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Mendoza River  
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Monte Desert  
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Phreatophytes  
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Prosopis Flexuosa Woodlands  
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Telteca Provincial Reserve (Argentina)  
dc.subject.classification
Ecología  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Water subsidies from mountains to deserts: their role in sustaining groundwater-fed oases in a sandy landscape  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-04-18T17:02:33Z  
dc.identifier.eissn
1939-5582  
dc.journal.volume
21  
dc.journal.number
3  
dc.journal.pagination
678-694  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Nueva York  
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 "Prof. Ezio Marchi"; Argentina. Universidad Nacional de San Luis. Facultad de Ingeniería y Ciencias Económico Sociales; Argentina  
dc.description.fil
Fil: Nosetto, Marcelo Daniel. Universidad Nacional de San Luis. Facultad de Ingeniería y Ciencias Económico Sociales; Argentina. 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. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Climatología Agrícola; Argentina  
dc.description.fil
Fil: Villagra, Pablo Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina  
dc.description.fil
Fil: Jackson, Robert B.. University Of Duke; Estados Unidos  
dc.journal.title
Ecological Applications