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Phragmites australis and silica cycling in tidal wetlands

Struyf, Eric LU ; Van Damme, Stefan; Gribsholt, Britta; Bal, K.; Beauchard, O.; Middelburg, Jack J. and Meire, Patrick (2007) In Aquatic Botany 87(2). p.134-140
Abstract
Tidal marshes have recently been shown to be important biogenic Si recycling surfaces at the land-sea interface. The role of vegetation in this recycling process has not yet been quantified. In situ and ex situ decomposition experiments were conducted with Phragmites australis stems. In a freshwater tidal marsh, litterbags were incubated at different elevations and during both winter and summer. Biogenic Si (BSi) dissolution followed a double exponential decay model in the litterbags (from ca. 60 to 15 mg g(-1) after 133 days), irrespective of season. Si was removed much faster from the incubated plant material compared to N and C, resulting in steadily decreasing Si/N and Si/C ratios. Ex situ, decomposition experiments were conducted in... (More)
Tidal marshes have recently been shown to be important biogenic Si recycling surfaces at the land-sea interface. The role of vegetation in this recycling process has not yet been quantified. In situ and ex situ decomposition experiments were conducted with Phragmites australis stems. In a freshwater tidal marsh, litterbags were incubated at different elevations and during both winter and summer. Biogenic Si (BSi) dissolution followed a double exponential decay model in the litterbags (from ca. 60 to 15 mg g(-1) after 133 days), irrespective of season. Si was removed much faster from the incubated plant material compared to N and C, resulting in steadily decreasing Si/N and Si/C ratios. Ex situ, decomposition experiments were conducted in estuarine water, treated with a broad-spectrum antibiotic, and compared to results from untreated incubations. The bacteria] influence on the dissolution of dissolved Si (DSi) from R australis stems was negligible. Although the rate constant for dissolved Si dissolution decreased from 0.004 to 0.003 h(-1), the eventual amount of BSi dissolved and saturation concentration in the incubation environment were similar in both treatments. P. australis contributes to and enhances dissolved Si recycling capacity of tidal marshes: in a reed-dominated small freshwater tidal marsh, more than 40% of DSi export was attributable to reed decomposition. As the relation between tidal marsh surface and secondary production in estuaries has been linked to marsh Si cycling capacity, this provides new insight in the ecological value of the common reed. (C) 2007 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
tidal marsh ecology, biogenic silica dissolution, Phragmites australis
in
Aquatic Botany
volume
87
issue
2
pages
134 - 140
publisher
Elsevier
external identifiers
  • wos:000248584500006
  • scopus:34250898687
ISSN
0304-3770
DOI
10.1016/j.aquabot.2007.05.002
language
English
LU publication?
yes
id
6fc53cc4-9ee4-43bc-aece-5a1f8f99fc33 (old id 692908)
date added to LUP
2008-01-03 09:01:33
date last changed
2017-09-24 04:24:51
@article{6fc53cc4-9ee4-43bc-aece-5a1f8f99fc33,
  abstract     = {Tidal marshes have recently been shown to be important biogenic Si recycling surfaces at the land-sea interface. The role of vegetation in this recycling process has not yet been quantified. In situ and ex situ decomposition experiments were conducted with Phragmites australis stems. In a freshwater tidal marsh, litterbags were incubated at different elevations and during both winter and summer. Biogenic Si (BSi) dissolution followed a double exponential decay model in the litterbags (from ca. 60 to 15 mg g(-1) after 133 days), irrespective of season. Si was removed much faster from the incubated plant material compared to N and C, resulting in steadily decreasing Si/N and Si/C ratios. Ex situ, decomposition experiments were conducted in estuarine water, treated with a broad-spectrum antibiotic, and compared to results from untreated incubations. The bacteria] influence on the dissolution of dissolved Si (DSi) from R australis stems was negligible. Although the rate constant for dissolved Si dissolution decreased from 0.004 to 0.003 h(-1), the eventual amount of BSi dissolved and saturation concentration in the incubation environment were similar in both treatments. P. australis contributes to and enhances dissolved Si recycling capacity of tidal marshes: in a reed-dominated small freshwater tidal marsh, more than 40% of DSi export was attributable to reed decomposition. As the relation between tidal marsh surface and secondary production in estuaries has been linked to marsh Si cycling capacity, this provides new insight in the ecological value of the common reed. (C) 2007 Elsevier B.V. All rights reserved.},
  author       = {Struyf, Eric and Van Damme, Stefan and Gribsholt, Britta and Bal, K. and Beauchard, O. and Middelburg, Jack J. and Meire, Patrick},
  issn         = {0304-3770},
  keyword      = {tidal marsh ecology,biogenic silica dissolution,Phragmites australis},
  language     = {eng},
  number       = {2},
  pages        = {134--140},
  publisher    = {Elsevier},
  series       = {Aquatic Botany},
  title        = {Phragmites australis and silica cycling in tidal wetlands},
  url          = {http://dx.doi.org/10.1016/j.aquabot.2007.05.002},
  volume       = {87},
  year         = {2007},
}