Karst soils: Dependence of CO2 concentrations on pore dimension

BLECHA, Martin and Jiří FAIMON. Karst soils: Dependence of CO2 concentrations on pore dimension. Acta Carsologica. 2014, vol. 43, No 1, p. 55-64. ISSN 0583-6050.

Basic information

• Original name: Karst soils: Dependence of CO2 concentrations on pore dimension
• Authors: BLECHA, Martin (203 Czech Republic, belonging to the institution) and Jiří FAIMON (203 Czech Republic, belonging to the institution).
• Edition: Acta Carsologica, 2014, 0583-6050.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: Geochemistry
• Country of publisher: Slovenia
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 0.451
• RIV identification code: RIV/00216224:14310/14:00076752
• Organization unit: Faculty of Science
• UT WoS: 000342408300005
• Keywords in English: CO 2 Concentration Karst Rainfall Temperature Soil
• Tags: AKR, rivok

Abstract

CO2 concentrations were studied in the selected soils of the Moravian Karst, Czech Republic. The direct measurement in the air of drill-holes has indicated that the concentrations depend inversely on a pore dimension. The simplified relation between the drill-hole diameter and CO2 concentration, c0(CO2) = (c(CO2)- bD)/(1+aD) was proposed, where c0(CO2) is the CO2 concentration extrapolated to the zero drill-hole diameter in ppmv, c(CO2) is directly measured CO2 concentration in ppmv, and D is drillhole diameter in cm. a and b are parameters in cm-1 and ppmv cm-1, respectively. For the karst soils formed at grass field and deciduous forest, the values of a and b parameters were determined as -0.146±0.012 (standard error) cm-1 and 262.0±56.3 ppmv cm-1, respectively. The dependence between cco2 and D was less obvious for the heavy clay soils of coniferous forest. To understand the dependence better, a conceptual model was created taking into account the concentration gradients and mass fluxes.