Biogenic silica sequestration in freshwater tidal marshes: relation with marsh developmental stage
Struyf, E.; Temmerman, S.; Meire, P. (2005). Biogenic silica sequestration in freshwater tidal marshes: relation with marsh developmental stage, in: Struyf, E. The role of freshwater marshes in estuarine silica cycling (Scheldt estuary) = De rol van zoetwaterschorren in de estuariene siliciumcyclus (Schelde-estuarium). pp. 99-122
In: Struyf, E. (2005). The role of freshwater marshes in estuarine silica cycling (Scheldt estuary) = De rol van zoetwaterschorren in de estuariene siliciumcyclus (Schelde-estuarium). PhD Thesis. Universiteit Antwerpen: Antwerpen. 162 pp., meer
The sequestration and recycling of biogenic silica (BSi) in freshwater tidal marshes was modelled through the combination of short-term year round sediment trap data with a long-term sedimentation model, MARSED. The modelling covered the complete evolution from a young rapidly rising marsh to a marsh with an elevation close to mean high water. BSi in imported suspended matter was higher in summer (10.9 mg BSi g-l sediment) than winter (7.6 mg BSi g-l sediment). However, the deposition of BSi on the marsh surface was higher in winter compared to summer, due to the higher sedimentation rates. Deposition of BSi was correlated to the suspended matter deposition. In the old marsh, yearly about 40 g BSi m-2 was deposited, while in the young marsh deposition could rise to 300 g m-2. Young marshes retained up to 85 % of the imported biogenic silica. Recycling efficiency (60%) increased drastically for older marshes
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