Biogenic silica in tidal freshwater marsh sediments and vegetation (Schelde estuary, Belgium)
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It is concluded that P. australis wetlands could be an essential, but unrecognised, sink for BSi in the biogeochemical cycling of Si in freshwater intertidal marshes.Abstract:
To date, estuarine ecosystem research has mostly neglected silica cycling in freshwater intertidal marshes. However, tidal marshes can store large amounts of biogenic silica (BSi) in vegetation and sediment. BSi content of the typical freshwater marsh plants Phragmites australis, Impatiens glandulifera, Urtica dioica, Epilobium hirsutum and Salix sp. was analysed year-round. All herbaceous species accumulated silica in their tissue during their life cycle. Of the live plants, P. aus- tralis contained the most BSi (accumulating from 6 to 55 mg g -1 ). Dead shoots of P. australis had the highest BSi content (up to 72.2 mg g -1 ). U. dioica (<11.1 mg g -1 ), I. glandulifera (<1.1 mg g -1 ), E. hirsutum (<1.2 mg g -1 ) and Salix sp. (<1.9 mg g -1 ) had a much lower BSi content. Except for P. aus- tralis rhizomes (<15 mg g -1 ) underground biomass contained low amounts of BSi (<6 mg g -1 ). Sediment BSi content decreased from the surface (9 to 10 mg g -1 ) to deeper layers (5 to 7 mg g -1 ). There was seasonal variation in sediment BSi. Dissolved Si in porewater was highest in summer (ca. 600 µM) and lowest in winter (ca. 400 µM). P. australis vegetation (aboveground and roots) con- tained up to 126 g m -2 BSi, while the upper 30 cm of sediment accumulated up to 1500 g m -2 , making sediment the largest BSi reservoir in the marsh. We conclude that P. australis wetlands could be an essential, but unrecognised, sink for BSi in the biogeochemical cycling of Si.read more
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Synthesis and perspectives for the future
TL;DR: This final chapter summarizes the main points about tidal freshwater wetlands that were presented throughout the book, including important ecological characteristics and societal benefits that result from healthy tidal freshwater ecosystems.
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Quantification of Amorphous Silicon by Optimizing the 1% Na2CO3 Method from Intensively Cultivated Rice and Sugarcane Soils in a Tropical Climate
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Silica Storage, Fluxes, and Nutrient Stoichiometry in Different Benthic Primary Producer Communities in the Littoral Zone of a Deep Subalpine Lake (Lake Iseo, Italy)
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TL;DR: In this paper, the authors analyzed stocks and fluxes of biogenic (BSi) and dissolved (DSi) silica in relation to nitrogen (N) and phosphorus (P) in the littoral zone of a deep lake.
References
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Journal ArticleDOI
The anomaly of silicon in plant biology.
TL;DR: Ample evidence is presented that silicon, when readily available to plants, plays a large role in their growth, mineral nutrition, mechanical strength, and resistance to fungal diseases, herbivory, and adverse chemical conditions of the medium.
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The supply and accumulation of silica in the marine environment
TL;DR: For example, the accumulation of biogenic silica in estuarine deposits removes a maximum of 8 × 1014g SiO2/yr or 10% of the dissolved silica input to the oceans as mentioned in this paper.
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The transport and function of silicon in plants.
TL;DR: A number of lines of evidence suggest the intrinsic PSi(OH)4 of about 10‐10 m s‐1 in the plant cell plasmalemma, while relatively low, could maintain the intracellular concentration of Si( OH)4 equal to that in the medium for a phytoplankton cell of 5 μm radius growing with a generation time of 24 h.
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Sulfur, carbon, and nitrogen isotopes used to trace organic matter flow in the salt-marsh estuaries of Sapelo Island, Georgia1
TL;DR: In this article, the stable isotopes of sulfur, nitrogen, and carbon were used to trace organic matter flow in salt marshes and cstuarinc waters at Sapelo Island, Georgia.
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Production and use of detritus in various freshwater, estuarine, and coastal marine ecosystems
TL;DR: It is suggested that the DOM pathway may be ecologically more significant than the POM (particulate organic matter) pathway and that processes analogous to those shown for lakes and rivers probably occur in estuarine and coastal waters.