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| Titel |
Vegetation and proximity to the river control amorphous silica storage in a riparian wetland (Biebrza National Park, Poland) |
| VerfasserIn |
E. Struyf, W. Opdekamp, H. Backx, S. Jacobs, D. J. Conley, P. Meire |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 4 ; Nr. 6, no. 4 (2009-04-23), S.623-631 |
| Datensatznummer |
250003643
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| Publikation (Nr.) |
 copernicus.org/bg-6-623-2009.pdf |
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| Zusammenfassung |
| Wetlands can modify and control nutrient fluxes between terrestrial and
aquatic ecosystems, yet little is known of their potential as biological
buffers and sinks in the biogeochemical silica cycle. We investigated the
storage of amorphous silica (ASi) in a central-European riparian wetland.
The variation in storage of ASi in the soil of an undisturbed wetland was
significantly controlled by two factors: dominance of sedges and grasses and
distance to the river (combined (R2=78%). Highest ASi storage was
found near the river and in sites with a dominance of grasses and sedges,
plants which are well known to accumulate ASi. The management practice of
mowing reduced the amount of variation attributed to both factors (R2=51%).
Although ASi concentrations in soils were low (between 0.1 and 1%
of soil dry weight), ASi controlled the availability of dissolved silica
(DSi) in the porewater, and thus potentially the exchange of DSi with the
nearby river system through both diffusive and advective fluxes. A depth
gradient in ASi concentrations, with lower ASi in the deeper layers,
indicates dissolution. Our results show that storage and recycling of ASi in
wetland ecosystems can differ significantly on small spatial scales. Human
management interferes with the natural control mechanisms. Our study
demonstrates that wetlands have the potential to modify the fluxes of both
DSi and ASi along the land-ocean continuum and supports the hypothesis that
wetlands are important ecosystems in the biogeochemical cycling of silica. |
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