Technical Note: Mesocosm approach to quantify dissolved inorganic carbon percolation fluxes
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Technical Note: Mesocosm approach to quantify dissolved inorganic carbon percolation fluxes. / Thaysen, E. M.; Jessen, Søren; Ambus, Per Lennart; Beier, C.; Postma, D.; Jakobsen, I.
In: Biogeosciences, Vol. 11, No. 4, 2014, p. 1077-1084.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Technical Note: Mesocosm approach to quantify dissolved inorganic carbon percolation fluxes
AU - Thaysen, E. M.
AU - Jessen, Søren
AU - Ambus, Per Lennart
AU - Beier, C.
AU - Postma, D.
AU - Jakobsen, I.
PY - 2014
Y1 - 2014
N2 - Dissolved inorganic carbon (DIC) fluxes across the vadose zone are influenced by a complex interplay of biological, chemical and physical factors. A novel soil mesocosm system was evaluated as a tool for providing information on the mechanisms behind DIC percolation to the groundwater from unplanted soil. Carbon dioxide partial pressure (pCO2), alkalinity, soil moisture and temperature were measured with depth and time, and DIC in the percolate was quantified using a sodium hydroxide trap. Results showed good reproducibility between two replicate mesocosms. The pCO2 varied between 0.2 and 1.1%, and the alkalinity was 0.1–0.6 meq L−1. The measured cumulative effluent DIC flux over the 78-day experimental period was 185–196 mg L−1 m−2 and in the same range as estimates derived from pCO2 and alkalinity in samples extracted from the side of the mesocosm column and the drainage flux. Our results indicate that the mesocosm system is a promising tool for studying DIC percolation fluxes and other biogeochemical transport processes in unsaturated environments.
AB - Dissolved inorganic carbon (DIC) fluxes across the vadose zone are influenced by a complex interplay of biological, chemical and physical factors. A novel soil mesocosm system was evaluated as a tool for providing information on the mechanisms behind DIC percolation to the groundwater from unplanted soil. Carbon dioxide partial pressure (pCO2), alkalinity, soil moisture and temperature were measured with depth and time, and DIC in the percolate was quantified using a sodium hydroxide trap. Results showed good reproducibility between two replicate mesocosms. The pCO2 varied between 0.2 and 1.1%, and the alkalinity was 0.1–0.6 meq L−1. The measured cumulative effluent DIC flux over the 78-day experimental period was 185–196 mg L−1 m−2 and in the same range as estimates derived from pCO2 and alkalinity in samples extracted from the side of the mesocosm column and the drainage flux. Our results indicate that the mesocosm system is a promising tool for studying DIC percolation fluxes and other biogeochemical transport processes in unsaturated environments.
U2 - 10.5194/bg-11-1077-2014
DO - 10.5194/bg-11-1077-2014
M3 - Journal article
VL - 11
SP - 1077
EP - 1084
JO - Biogeosciences
JF - Biogeosciences
SN - 1726-4170
IS - 4
ER -
ID: 129959988