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| Titel |
Enhanced decomposition offsets enhanced productivity and soil carbon accumulation in coastal wetlands responding to climate change |
| VerfasserIn |
M. L. Kirwan, L. K. Blum |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2011-04-21), S.987-993 |
| Datensatznummer |
250005698
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| Publikation (Nr.) |
 copernicus.org/bg-8-987-2011.pdf |
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| Zusammenfassung |
| Coastal wetlands are responsible for about half of all carbon burial in
oceans, and their persistence as a valuable ecosystem depends largely on the
ability to accumulate organic material at rates equivalent to relative sea
level rise. Recent work suggests that elevated CO2 and temperature
warming will increase organic matter productivity and the ability of marshes
to survive sea level rise. However, we find in a series of preliminary
experiments that organic decomposition rates increase by about 20% per
degree of warming. Our measured temperature sensitivity is similar to
studies from terrestrial systems, three times as high as the response of
salt marsh productivity to temperature warming, and greater than the
productivity response associated with elevated CO2 in C3 marsh
plants. Although the experiments were simple and of short duration, they
suggest that enhanced CO2 and warmer temperatures could actually make
marshes less resilient to sea level rise, and tend to promote a release of
soil carbon. Simple projections indicate that elevated temperatures will
increase rates of sea level rise more than any acceleration in organic
matter accumulation, suggesting the possibility of a positive feedback
between climate, sea level rise, and carbon emissions in coastal
environments. |
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