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An enormous amorphous silica stock in boreal wetlands
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 115, G04008- p.Article in journal (Refereed) Published
Abstract [en]

We investigated amorphous Si (ASi) in a boreal wetland in northern Sweden. We found enormous stocks of ASi in the upper soil layers (up to 11% of dry weight), in the form of diatom frustules and plant ASi. A consistent exponential decrease in ASi concentrations was observed with increasing depth in the soil profile. An inverse modeling approach shows that vegetation takes up a substantial part of weathered dissolved Si (DSi). Concurrent analysis of N and C indicates a faster turnover in and a higher leakage from the ASi pool. The magnitude of the biological buffering we observed is unprecedented and supports the emerging paradigm of the importance of biological uptake of DSi governing the export of DSi from terrestrial ecosystems. Our results complicate current models of silicate transport, highlighting the necessity to incorporate ecosystem biological buffering in our concept of Si biogeochemistry.

Place, publisher, year, edition, pages
2010. Vol. 115, G04008- p.
Keyword [en]
National Category
Earth and Related Environmental Sciences
Research subject
Applied Environmental Science
URN: urn:nbn:se:su:diva-51239DOI: 10.1029/2010JG001324ISI: 000285009700005OAI: diva2:387732
authorCount :4Available from: 2011-01-14 Created: 2011-01-10 Last updated: 2011-01-14Bibliographically approved

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Morth, Carl-MagnusHumborg, Christoph
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Department of Geological SciencesDepartment of Applied Environmental Science (ITM)
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