 |
| Titel |
Technical Note: Mesocosm approach to quantify dissolved inorganic carbon percolation fluxes |
| VerfasserIn |
E. M. Thaysen, S. Jessen, P. Ambus, C. Beier, D. Postma, I. Jakobsen |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 4 ; Nr. 11, no. 4 (2014-02-25), S.1077-1084 |
| Datensatznummer |
250117243
|
| Publikation (Nr.) |
 copernicus.org/bg-11-1077-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|