Academic Journal
Centennial black carbon turnover observed in a Russian steppe soil.
| Title: | Centennial black carbon turnover observed in a Russian steppe soil. |
|---|---|
| Authors: | Hammes, K., Torn, M. S., Lapenas, A. G., Schmidt, M. W. I. |
| Source: | Biogeosciences Discussions; 2008, Vol. 5 Issue 1, p661-683, 23p, 1 Chart, 5 Graphs |
| Abstract: | Black carbon (BC), from incomplete combustion of fuels and biomass, has been considered highly recalcitrant and a substantial sink for carbon dioxide. Recent studies have shown that BC can be degraded. We use soils sampled 100 years apart in a Russian steppe preserve to generate the first whole-profile estimate of BC stocks and turnover in the field. BC stocks (initially 2.5 kg m-2) decreased 25% with cessation of biomass burning. BC turnover in the soil was 293 y (best estimate; range 212-541 y), much faster than inert/passive carbon in soil models. Such results provide a new constraint on theories of soil carbon stabilization. Most importantly, BC cannot be assumed chemically recalcitrant in all soils; other explanations for very old soil carbon are needed. [ABSTRACT FROM AUTHOR] |
| Subject Terms: | THERMOCHEMISTRY, SOIL testing, CARBON, BIODEGRADATION, SOIL stabilization, TRACE analysis, THERMAL analysis, DETERMINATIVE mineralogy |
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| ISSN: | 18106277 |
| DOI: | 10.5194/bgd-5-661-2008 |
| Database: | Complementary Index |
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