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| Titel |
Relative stability of soil carbon revealed by shifts in δ¹⁵N and C:N ratio |
| VerfasserIn |
F. Conen, M. Zimmermann, 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 ; 5, no. 1 ; Nr. 5, no. 1 (2008-02-01), S.123-128 |
| Datensatznummer |
250002231
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| Publikation (Nr.) |
 copernicus.org/bg-5-123-2008.pdf |
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| Zusammenfassung |
| Life on earth drives a continuous exchange of carbon between soils and the
atmosphere. Some forms of soil carbon, or organic matter, are more stable
and have a longer residence time in soil than others. Relative differences
in stability have often been derived from shifts in δ13C (which is bound
to a vegetation change from C3 to C4 type) or through 14C-dating (which
is bound to small sample numbers because of high measurement costs). Here,
we propose a new concept based on the increase in δ15N and the decrease
in C:N ratio with increasing stability. We tested the concept on grasslands
at different elevations in the Swiss Alps. Depending on elevation and soil
depth, it predicted mineral-associated organic carbon to be 3 to 73 times
more stable than particulate organic carbon. Analysis of 14C-ages
generally endorsed these predictions. |
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