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Freshwater marshes as dissolved silica recyclers in an estuarine environment (Schelde estuary, Belgium)

Struyf, E. and Damme van, S. and Gribsholt, B. and Meire, P. (2005) Freshwater marshes as dissolved silica recyclers in an estuarine environment (Schelde estuary, Belgium). Hydrobiologia, 540, 69-77. ISSN 0018-8158.

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Official URL: http://dx.doi.org/10.1007/s10750-004-7104-0

Abstract

Compared to knowledge about N and P processing in the aquatic continuum of lakes, wetlands and estuaries, knowledge concerning transport and cycling of Si is only fragmentary. Furthermore, Si research in estuaries has mainly been focused on subtidal benthic sediments and uptake and recycling by diatom communities. The biogeochemical cycling of Si in tidal wetlands, which can contain large amounts of Si, has thus far been neglected. We have conducted several whole ecosystem Si mass-balances on a freshwater marsh located in the Schelde estuary (6 tidal cycles, 2 with BSi included). Our measurements show that the freshwater marsh acts as an important source of dissolved Si to the main river (1–18% more export than import, on average 0.114 g m–2). This export is compensated by import of amorphous silica into the marsh (19–55% more import than export). The marsh was shown to act as silica recycler, resupplying biologically available dissolved Si to the estuarine ecosystem. Extrapolations show that during summer and spring months, when dissolved silica is depleted due to diatom growth, almost half of the total dissolved silica load in the main river channel could result from marsh recycling. [KEYWORDS: estuary ; dissolved silica recycling ; biogenic silica ; eutrophication ; freshwater marshes]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11792
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 11:08

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