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Abstract:

Accurate measurements to assess the influence of soil moisture on CO2 flux requires the absolute estimates of soil CO2 flux. Thus, it was constructed a calibration system where CO2 with fixed concentration flowed through the different porous material. Previous to measurement, in order to verify the performance and reliability of a closed dynamic chamber, different discontinuous air-mixing rates and times were tested. The CO2 flux was estimated through sequential lectures and the best fit for flux measurements was obtained taking short readings every 3 min, during a total time of 12 min (R2 = 0.99). The best mixing rate was attained for 250 mL min-1, allowing 25 s of mixing previous to CO2 extraction for an infrared gas analyzer. The deviation of the measured values for dry sand from the reference CO2 flux (0.097 and 0.071 g m-2 min-1) was 5 and 7%. On dry sandy loam soil (SLS) the deviation was 2%. The measured fluxes decreased 73 and 22% with content moisture of 20 and 10% (sand), and 78% with content moisture of 31% (SLS). This work allowed to estimate how much the measured emission rates deviate from the true ones for the specified chamber and sampling conditions. © Springer-Verlag 2008.

Registro:

Documento: Artículo
Título:Assessment of soil moisture influence on CO2 flux: A laboratory experiment
Autor:Sanci, R.; Panarello, H.O.; Ostera, H.A.
Filiación:Instituto de Geocronología y Geología Isotópica, Universidad Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas, Pabellón INGEIS, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Palabras clave:Calibration system; Closed dynamic chamber; Soil CO2 flux; Soil moisture; Accurate measurement; Best fit; Calibration system; Closed dynamic chamber; Dry sand; Dynamic chamber; Emission rates; Flux measurements; Infrared gas analyzers; Laboratory experiments; Mixing rates; Sampling conditions; Sandy loam soils; Soil CO; Soil CO2 flux; Calibration; Groundwater; Moisture determination; Permittivity; Porous materials; Soil moisture; carbon dioxide; carbon flux; concentration (composition); experimental study; laboratory method; porous medium; sandy soil; soil moisture
Año:2009
Volumen:58
Número:3
Página de inicio:491
Página de fin:497
DOI: http://dx.doi.org/10.1007/s00254-008-1522-7
Título revista:Environmental Geology
Título revista abreviado:Environ. Geol.
ISSN:09430105
CODEN:ENGOE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09430105_v58_n3_p491_Sanci

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Citas:

---------- APA ----------
Sanci, R., Panarello, H.O. & Ostera, H.A. (2009) . Assessment of soil moisture influence on CO2 flux: A laboratory experiment. Environmental Geology, 58(3), 491-497.
http://dx.doi.org/10.1007/s00254-008-1522-7
---------- CHICAGO ----------
Sanci, R., Panarello, H.O., Ostera, H.A. "Assessment of soil moisture influence on CO2 flux: A laboratory experiment" . Environmental Geology 58, no. 3 (2009) : 491-497.
http://dx.doi.org/10.1007/s00254-008-1522-7
---------- MLA ----------
Sanci, R., Panarello, H.O., Ostera, H.A. "Assessment of soil moisture influence on CO2 flux: A laboratory experiment" . Environmental Geology, vol. 58, no. 3, 2009, pp. 491-497.
http://dx.doi.org/10.1007/s00254-008-1522-7
---------- VANCOUVER ----------
Sanci, R., Panarello, H.O., Ostera, H.A. Assessment of soil moisture influence on CO2 flux: A laboratory experiment. Environ. Geol. 2009;58(3):491-497.
http://dx.doi.org/10.1007/s00254-008-1522-7