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Abstract
Covering 16% of global land surface, dry forests play a key role in the global carbon budget. The Southern Hemisphere still preserves a high proportion of its native dry forest cover, but deforestation rates have increased dramatically in the last decades. In this paper, we quantified for the first time the magnitude and temporal variability of carbon dioxide and water vapor fluxes and their environmental controls based on eddy covariance measurements in [ver mas...]
dc.contributor.authorGarcia, Alfredo Gabriel
dc.contributor.authorDi Bella, Carlos Marcelo
dc.contributor.authorHouspanossian, Javier
dc.contributor.authorMagliano, Patricio
dc.contributor.authorJobbagy Gampel, Esteban Gabriel
dc.contributor.authorPosse Beaulieu, Gabriela
dc.contributor.authorFernandez, Roberto J.
dc.contributor.authorNosetto, Marcelo Daniel
dc.coverage.spatialArgentina (nation)
dc.date.accessioned2017-10-20T13:58:22Z
dc.date.available2017-10-20T13:58:22Z
dc.date.issued2017-12
dc.identifier.issn0168-1923
dc.identifier.otherhttps://doi.org/10.1016/j.agrformet.2017.08.015
dc.identifier.urihttp://hdl.handle.net/20.500.12123/1550
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0168192317302721
dc.description.abstractCovering 16% of global land surface, dry forests play a key role in the global carbon budget. The Southern Hemisphere still preserves a high proportion of its native dry forest cover, but deforestation rates have increased dramatically in the last decades. In this paper, we quantified for the first time the magnitude and temporal variability of carbon dioxide and water vapor fluxes and their environmental controls based on eddy covariance measurements in a dry forest site of central Argentina. Continuous measurements of CO2 and water vapor exchanges spanning a 15-month period (Dec. 2009 – March 2011) showed that the studied dry forest was a net sink of carbon, with an overall integrated net ecosystem exchange (NEE) of −172 g C m−2 (−132.8 g C m−2 for year 2010). The cool dry season (May–Sept.) accounted for a quarter of the total annual NEE of year 2010 with low but steady CO2 uptake rates (1 g C m−2 d−1 on average) that were more strongly associated with temperature than with soil moisture. By contrast, in the warm wet season (Oct.–April), almost three times greater CO2 uptake rates (2.7 g C m−2 d−1 on average) resulted from a highly pulsed behavior in which CO2 uptake showed sharp increases followed by rapid declines after rainfall events. Cumulative evapotranspiration (ET) during the whole study (595 mm) accounted for most of the rainfall inputs (674 mm), with daily water vapor fluxes during the wet season being four times greater compared to those observed during the dry season (1.7 mm d−1 vs. 0.45 mm d−1). Modeling of the partition of all evaporative water losses suggested that transpiration was the dominant vapor flux (67% of ET), followed by interception (20%) and soil evaporation (13%). The influence of air temperature on half-hourly CO2 fluxes was notably different for the dry and wet seasons. In the 11–34 °C air temperature range, CO2 uptake rates were higher in the warm wet rather than the cool dry season, yet this difference narrowed with temperatures >26 °C. The dry forest became a net CO2 source at 40 °C. Our study provides new insights about the functioning of dry forests and the likely response of their CO2 and water vapor exchange with the atmosphere under future climate and land use/cover changes.eng
dc.formatapplication/pdf
dc.language.isoeng
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.sourceAgricultural and Forest Meteorology 247 : 520-532 (December 2017)
dc.subjectDióxido de Carbono
dc.subjectCarbon Dioxideeng
dc.subjectVapor de Agua
dc.subjectWater Vapoureng
dc.subjectBosques
dc.subjectForestseng
dc.subjectDeforestación
dc.subjectDeforestationeng
dc.subject.otherCO2
dc.subject.otherArgentina
dc.titlePatterns and controls of carbon dioxide and water vapor fluxes in a dry forest of central Argentina
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.description.origenInst. de Clima y Agua
dc.gic155060
dc.description.filFil: Garcia, Alfredo Gabriel. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Clima y Agua; Argentina
dc.description.filFil: Di Bella, Carlos Marcelo. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Clima y Agua; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos; Argentina
dc.description.filFil: Houspanossian, Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Matemática Aplicada de San Luis; Argentina. Universidad Nacional de San Luis; Argentina
dc.description.filFil: Magliano, Patricio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Matemática Aplicada de San Luis; Argentina. Universidad Nacional de San Luis; Argentina
dc.description.filFil: Jobbagy Gampel, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Matemática Aplicada de San Luis; Argentina. Universidad Nacional de San Luis; Argentina
dc.description.filFil: Posse Beaulieu, Gabriela. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Clima y Agua; Argentina
dc.description.filFil: Nosetto, Marcelo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de investigación Fisiológicas y Ecológicas Vinculado a la Agricultura. Universidad de Buenos Aires; Argentina. Universidad Nacional de Entre Ríos. Facultad de Ciencias Agropecuarias. Cátedra de Climatología; Argentina
dc.description.filFil: Fernandez, Roberto J. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de investigación Fisiológicas y Ecológicas Vinculado a la Agricultura. Universidad de Buenos Aires; Argentina
dc.subtypecientifico


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