Quantifying and correcting for pre-assay CO2 loss in short-term carbon mineralization assays
| Autor: | M. A. Belanger, C. Vizza, G. P. Robertson, S. S. Roley |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | SOIL, Vol 7, Pp 47-52 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2199-3971 2199-398X |
| DOI: | 10.5194/soil-7-47-2021 |
| Popis: | The active fraction of soil organic carbon is an important component of soil health and often is quickly assessed as the pulse of CO2 released by re-wetting dried soils in short-term (24–72 h) assays. However, soils can lose carbon (C) as they dry and, if soil samples vary in moisture content at sampling, differential C loss during the pre-assay dry-down period may complicate the assay's interpretations. We examined the impact of pre-assay CO2 loss in a long-cultivated agricultural soil at initial moisture contents of 30 %, 50 %, and 70 % water-filled pore space (WFPS). We found that 50 % and 70 % WFPS treatments lost more C during drying than did those in the 30 % WFPS treatment and that dry-down losses led to a 26 %–32 % underestimate of their CO2 pulses. We developed a soil-specific correction factor to account for these initial soil moisture effects. Future C mineralization studies may benefit from similar corrections. |
| Databáze: | Directory of Open Access Journals |
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