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| Titel |
Effects of temperature and organic pollution on nutrient cycling in marine sediments |
| VerfasserIn |
C. Sanz-Lázaro, T. Valdemarsen, M. Holmer |
| 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 ; 12, no. 15 ; Nr. 12, no. 15 (2015-08-03), S.4565-4575 |
| Datensatznummer |
250118045
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| Publikation (Nr.) |
 copernicus.org/bg-12-4565-2015.pdf |
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| Zusammenfassung |
| Increasing ocean temperature due to climate change is an important
anthropogenic driver of ecological change in coastal systems. In these
systems sediments play a major role in nutrient cycling. Our ability to
predict ecological consequences of climate change is enhanced by simulating
real scenarios. Based on predicted climate change scenarios, we tested the
effect of temperature and organic pollution on nutrient release from coastal
sediments to the water column in a mesocosm experiment. PO43−
release rates from sediments followed the same trends as organic matter
mineralization rates, increased linearly with temperature and were
significantly higher under organic pollution than under nonpolluted
conditions. NH4+ release only increased significantly when the
temperature rise was above 6 °C, and it was significantly
higher in organic polluted compared to nonpolluted sediments. Nutrient
release to the water column was only a fraction from the mineralized organic
matter, suggesting PO43− retention and NH4+ oxidation in
the sediment. Bioturbation and bioirrigation appeared to be key processes
responsible for this behavior. Considering that the primary production of
most marine basins is N-limited, the excess release of NH4+ at a
temperature rise > 6 °C could enhance water column primary
productivity, which may lead to the deterioration of the environmental
quality. Climate change effects are expected to be accelerated in areas
affected by organic pollution. |
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