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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
dc.subject Central Monte Desert
dc.subject Western Argentina
dc.subject Cordillera de los Andes
dc.subject Groundwater recharge/discharge
dc.subject Larrea shrublands
dc.subject Mendoza river
dc.subject Monte Desert
dc.subject Phreatophytes
dc.subject Prosopis flexuosa woodlands
dc.subject Telteca Provincial Reserve (Argentina)
dc.subject.classification Ecología
dc.subject.classification Ciencias Biológicas
dc.subject.classification 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


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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)