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An enormous amorphous silica stock in boreal wetlands

Struyf, Eric LU ; Morth, Carl-Magnus; Humborg, Christoph and Conley, Daniel LU (2010) In Journal of Geophysical Research 115.
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Geophysical Research
volume
115
publisher
American Geophysical Union
external identifiers
  • wos:000285009700005
  • scopus:77958158416
ISSN
2156-2202
DOI
10.1029/2010JG001324
project
BECC
language
English
LU publication?
yes
id
3ea774c1-011b-49a2-8dd7-477ddfde0e13 (old id 1751703)
date added to LUP
2010-12-29 13:55:28
date last changed
2018-06-10 03:02:24
@article{3ea774c1-011b-49a2-8dd7-477ddfde0e13,
  abstract     = {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.},
  author       = {Struyf, Eric and Morth, Carl-Magnus and Humborg, Christoph and Conley, Daniel},
  issn         = {2156-2202},
  language     = {eng},
  publisher    = {American Geophysical Union},
  series       = {Journal of Geophysical Research},
  title        = {An enormous amorphous silica stock in boreal wetlands},
  url          = {http://dx.doi.org/10.1029/2010JG001324},
  volume       = {115},
  year         = {2010},
}