Assessment of soil moisture influence on CO2 flux: A laboratory experiment
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...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09430105_v58_n3_p491_Sanci http://hdl.handle.net/20.500.12110/paper_09430105_v58_n3_p491_Sanci |
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paper:paper_09430105_v58_n3_p491_Sanci2023-06-08T15:53:38Z Assessment of soil moisture influence on CO2 flux: A laboratory experiment 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 CO<sub>2</sub> 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 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09430105_v58_n3_p491_Sanci http://hdl.handle.net/20.500.12110/paper_09430105_v58_n3_p491_Sanci |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 CO<sub>2</sub> 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 |
| spellingShingle |
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 CO<sub>2</sub> 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 Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| topic_facet |
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 CO<sub>2</sub> 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 |
| description |
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. |
| title |
Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| title_short |
Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| title_full |
Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| title_fullStr |
Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| title_full_unstemmed |
Assessment of soil moisture influence on CO2 flux: A laboratory experiment |
| title_sort |
assessment of soil moisture influence on co2 flux: a laboratory experiment |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09430105_v58_n3_p491_Sanci http://hdl.handle.net/20.500.12110/paper_09430105_v58_n3_p491_Sanci |
| _version_ |
1768545236221427712 |