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  Surficial and deep pore water circulation governs spatial and temporal scales of nutrient recycling in intertidal sand flat sediment

Billerbeck, M., Werner, U., Polerecky, L., Walpersdorf, E., deBeer, D., & Huettel, M. (2006). Surficial and deep pore water circulation governs spatial and temporal scales of nutrient recycling in intertidal sand flat sediment. Marine Ecology-Progress Series, 326, 61-76.

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 Creators:
Billerbeck, M.1, Author              
Werner, U.2, Author              
Polerecky, L.2, Author              
Walpersdorf, E.3, Author              
deBeer, D.2, Author              
Huettel, M.4, Author              
Affiliations:
1HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
2Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              
3Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              
4Flux Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481701              

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Free keywords: intertidal flat; permeable sediment; oxygen consumption; sulfate reduction; sedimentary mineralization; pore water transport
 Abstract: This study addresses organic matter decomposition in permeable sediment of a sloping intertidal sand flat (German Wadden Sea) affected by current-induced pore water exchange and pore fluid drainage. Seasonal and spatial scales of aerobic and anaerobic mineralization were investigated at 2 sites, one near the water line and one on the upper flat. Hydrodynamic forcing during inundation caused deeper oxygen penetration through flushing of the uppermost sediment layer. This flushing resulted in higher areal oxygen consumption rates and lower depth integrated sulfate reduction rates in the submerged flat compared to the rates measured during exposure. Mineralization rates in the top 15 cm of the sediment were similar between both study sites and ranged from 38 (winter) to 280 mmol C m–2 d–1 (summer), with sulfate reduction contributing 3 to 25% to total mineralization, depending on the season. At the upper flat, these seasonal differences were reflected in the pore water concentrations of nutrients, dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). Near the low water line, however, pore water nutrient and DIC concentrations were independent of the season and up to 15 times higher compared to the values recorded in the upper flat. The differences in concentrations of metabolic products between the 2 sites resulted from a low tide drainage extending deep below the uppermost flushed layer and causing seepage of pore water near the low water line. Mineralization and nutrient release in these permeable intertidal sediments is affected by 2 circulation processes that work on distinctly different temporal and spatial scales: (1) rapid ‘skin circulation’ through the uppermost sediment layer during inundation that is characterized by short flow paths, low pore water residence time and immediate feedback to the ecosystem, and (2) slow ‘body circulation’ through deeper sediment layers during low tide that is characterized by long flow paths and pore water residence times, and acts as a buffered nutrient source to the ecosystem.

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Language(s): eng - English
 Dates: 2006-11-17
 Publication Status: Published in print
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 306487
ISI: 000243104300006
 Degree: -

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Title: Marine Ecology-Progress Series
  Other : Mar. Ecol.-Prog. Ser.
Source Genre: Journal
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Publ. Info: Oldendorf/Luhe, Germany [etc.] : Inter-Research.
Pages: - Volume / Issue: 326 Sequence Number: - Start / End Page: 61 - 76 Identifier: ISSN: 0171-8630
CoNE: https://pure.mpg.de/cone/journals/resource/954925486754