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| Titel |
Benthic phosphorus and iron budgets for three NW African slope sediments: a balance approach |
| VerfasserIn |
K. Küster-Heins, G. J. Lange, M. Zabel |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2010-02-03), S.469-480 |
| Datensatznummer |
250004483
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| Publikation (Nr.) |
 copernicus.org/bg-7-469-2010.pdf |
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| Zusammenfassung |
| Despite intensive research on the different domains of the marine phosphorus
(P) cycle during the last decades, frequently discussed open questions still
exist especially on controlling factors for the benthic behaviour of P and
its general distribution in sediment-pore water systems. Steady state or the
internal balance of all relevant physical and (bio)geochemical processes are
amongst the key issues. In this study we present and discuss an extended
data set from surface sediments recovered from three locations on the NW
African continental slope. Pore water data and results from sequential
sediment extractions give clear evidence to the well-known close
relationship between the benthic cycles of P and iron. Accordingly, most of
the dissolved phosphate must have been released by microbially catalyzed
reductive dissolution of iron (oxhydr)oxides. However, rates of release and
association of P and iron, respectively, are not directly represented in
profiles of element specific sediment compositions. Results from
steady-state based transport-reaction modelling suggest that particle mixing
due to active bioturbation, or rather a physical net downward transport of P
associated to iron (oxyhydr)oxides, is an essential process for the balance
of the inspected benthic cycles. This study emphasizes the importance of
balancing analytical data for a comprehensive understanding of all processes
involved in biogeochemical cycles. |
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