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  Molecular composition of dissolved organic matter from a wetland plant (Juncus effusus) after photochemical and microbial decomposition (1.25 yr): Common features with deep sea dissolved organic matter

Rossel, P. E., Vähätalo, A. V., Witt, M., & Dittmar, T. (2013). Molecular composition of dissolved organic matter from a wetland plant (Juncus effusus) after photochemical and microbial decomposition (1.25 yr): Common features with deep sea dissolved organic matter. Organic Geochemistry, 60, 62-71.

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Rossel, P. E.1, Author           
Vähätalo, A. V., Author
Witt, M., Author
Dittmar, T.2, Author           
Affiliations:
1HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
2Marine Geochemistry Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481705              

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 Abstract: We hypothesized that microbial and photochemical processing of dissolved organic matter (DOM) determines its molecular formula composition in aquatic systems to a greater degree than does the original source of the DOM. To test this hypothesis, we exposed DOM from a leachate of a wetland plant (Juncus effusus) to solar radiation or incubated it in the dark for 1.25 yr. Analysis of the extracted DOM of the leachates via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) identified 2800 molecular formulae. Of the formulae in the initial DOM, 11% were lost during microbial decomposition in the dark and 54% under solar radiation. Solar radiation also produced a large number of formulae containing N, that were preferentially degraded by microorganisms (47% loss). We compared the "recal-citrant formulae'', i.e. those not degraded in the experiment, with those of DOM from the deep North Pacific Ocean. Of the deep sea DOM formulae, 18% were present in the recalcitrant fraction of the initial DOM. An additional 18% of the formulae in marine DOM were photoproduced and recalcitrant, and 8% were produced by microbes in the experiment. Consequently, 44% of the deep sea DOM shares identical molecular formulae with the recalcitrant DOM from the experiment, most of which were produced by the combined action of sunlight and microbes. This indicates that processes in the water column may be more important than the original source in determining the composition of bulk DOM. (C) 2013 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2013-07
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 675373
ISI: 000321109400008
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Title: Organic Geochemistry
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 60 Sequence Number: - Start / End Page: 62 - 71 Identifier: ISSN: 0146-6380
CoNE: https://pure.mpg.de/cone/journals/resource/954925474428