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Evidence for suboxic nitrification in recent marine sediments.

Mortimer, R. J. G. and Krom, M. D. and Harris, S. J. and Hayes, P. J. and Davies, I. M. and Davison, William and Zhang, Hao (2002) Evidence for suboxic nitrification in recent marine sediments. Marine Ecology Progress Series, 236 (1). pp. 31-35.

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    Abstract

    The classical scheme of biogeochemical zones (BGZ) is known to be an oversimplification of the microbial processes that occur in organic-rich marine sediments. Results from a coupled deployment of pore-water gel probes in Loch Duich, Scotland, provide direct evidence for rapid recycling within the iron reduction (FeR) and sulphate reduction (SR) zones. High resolution pore-water profiles obtained using diffusive equilibrium in thin films (DET) gel probes found a nitrate peak at the boundary between the FeR and SR zones. This non-steady state feature is consistent with recycling of reduced N occurring throughout the FeR zone. Both conventional pore-water iron profiles and results from diffusive gradient in thin films (DGT) probes indicate that iron is solubilised and precipitated in rapid Fe/S recycling reactions throughout the SR zone. The presence of such complex recycling reactions confirms the oversimplification of the classical BGZ scheme.

    Item Type: Article
    Journal or Publication Title: Marine Ecology Progress Series
    Additional Information: (c)Inter-Research 2002.
    Uncontrolled Keywords: Biogeochemical recycling · Suboxic nitrification · DET · DGT
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 21490
    Deposited By: ep_ss_importer
    Deposited On: 15 Jan 2009 11:14
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 15:47
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/21490

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