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| Titel |
Warming mineralises young and old soil carbon equally |
| VerfasserIn |
F. Conen, J. Leifeld, B. Seth, C. Alewell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 3, no. 4 ; Nr. 3, no. 4 (2006-11-07), S.515-519 |
| Datensatznummer |
250001162
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| Publikation (Nr.) |
 copernicus.org/bg-3-515-2006.pdf |
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| Zusammenfassung |
| The temperature sensitivity of soil organic carbon decomposition is critical
for predicting future climate change because soils store 2-3 times the
amount of atmospheric carbon. Of particular controversy is the question,
whether temperature sensitivity differs between young or labile and old or
more stable carbon pools. Ambiguities in experimental methodology have so
far limited corroboration of any particular hypothesis. Here, we show in a
clear-cut approach that differences in temperature sensitivity between young
and old carbon are negligible. Using the change in stable isotope
composition in transitional systems from C3 to C4 vegetation, we were able
to directly distinguish the temperature sensitivity of carbon differing
several decades in age. This method had several advantages over previously
followed approaches. It allowed to identify release of much older carbon,
avoided un-natural conditions of long-term incubations and did not require
arguable curve-fitting. Our results demonstrate that feedbacks of the carbon
cycle on climate change are driven equally by young and old soil organic
carbon. |
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