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| Titel |
Microbial bioavailability regulates organic matter preservation in marine sediments |
| VerfasserIn |
K. A. Koho, K. G. J. Nierop, L. Moodley, J. J. Middelburg, L. Pozzato, K. Soetaert, J. Plicht, G.-J. Reichart |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-20), S.1131-1141 |
| Datensatznummer |
250017523
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| Publikation (Nr.) |
 copernicus.org/bg-10-1131-2013.pdf |
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| Zusammenfassung |
| Burial of organic matter (OM) plays an important role in marine sediments,
linking the short-term, biological carbon cycle with the long-term,
geological subsurface cycle. It is well established that low-oxygen
conditions promote organic carbon burial in marine sediments. However, the
mechanism remains enigmatic. Here we report biochemical quality, microbial
degradability, OM preservation and accumulation along an oxygen gradient in
the Indian Ocean. Our results show that more OM, with biochemically higher
quality, accumulates under low oxygen conditions. Nevertheless, microbial
degradability does not correlate with the biochemical quality of OM. This
decoupling of OM biochemical quality and microbial degradability, or
bioavailability, violates the ruling paradigm that higher quality implies
higher microbial processing. The inhibition of bacterial OM remineralisation
may play an important role in the burial of organic matter in marine
sediments and formation of oil source rocks. |
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