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Warming mineralises young and old soil carbon equally
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 86888
Author(s) Conen, F.; Leifeld, J.; Seth, B.; Alewell, C.
Author(s) at UniBasel Alewell, Christine
Year 2006
Title Warming mineralises young and old soil carbon equally
Journal Biogeosciences
Volume 3
Number 4
Pages / Article-Number 515-519
Abstract 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 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.
Publisher Copernicus
ISSN/ISBN 1726-4170
URL http://www.biogeosciences.net/3/515/2006/bg-3-515-2006.pdf
edoc-URL http://edoc.unibas.ch/dok/A5251159
Full Text on edoc Available
Digital Object Identifier DOI 10.5194/bg-3-515-2006
ISI-Number WOS:000243785300009
Document type (ISI) Article
 
   

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