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Estimated storage of amorphous silica in soils of the circum-Arctic tundra region

Alfredsson, H. LU ; Clymans, W. LU ; Hugelius, G.; Kuhry, P. and Conley, D. J. LU (2016) In Global Biogeochemical Cycles 30(3). p.479-500
Abstract

We investigated the vertical distribution, storage, landscape partitioning, and spatial variability of soil amorphous silica (ASi) at four different sites underlain by continuous permafrost and representative of mountainous and lowland tundra, in the circum-Arctic region. Based on a larger set of data, we present the first estimate of the ASi soil reservoir (0-1 m depth) in circum-Arctic tundra terrain. At all sites, the vertical distribution of ASi concentrations followed the pattern of either (1) declining concentrations with depth (most common) or (2) increasing/maximum concentrations with depth. Our results suggest that a set of processes, including biological control, solifluction and other slope processes, cryoturbation, and... (More)

We investigated the vertical distribution, storage, landscape partitioning, and spatial variability of soil amorphous silica (ASi) at four different sites underlain by continuous permafrost and representative of mountainous and lowland tundra, in the circum-Arctic region. Based on a larger set of data, we present the first estimate of the ASi soil reservoir (0-1 m depth) in circum-Arctic tundra terrain. At all sites, the vertical distribution of ASi concentrations followed the pattern of either (1) declining concentrations with depth (most common) or (2) increasing/maximum concentrations with depth. Our results suggest that a set of processes, including biological control, solifluction and other slope processes, cryoturbation, and formation of inorganic precipitates influence vertical distributions of ASi in permafrost terrain, with the capacity to retain stored ASi on millennial timescales. At the four study sites, areal ASi storage (0-1 m) is generally higher in graminoid tundra compared to wetlands. Our circum-Arctic upscaling estimates, based on both vegetation and soil classification separately, suggest a storage amounting to 219 ± 28 and 274 ± 33 Tmol Si, respectively, of which at least 30% is stored in permafrost. This estimate would account for about 3% of the global soil ASi storage while occupying an equal portion of the global land area. This result does not support the hypothesis that the circum-Arctic tundra soil ASi reservoir contains relatively higher amounts of ASi than other biomes globally as demonstrated for carbon. Nevertheless, climate warming has the potential to significantly alter ASi storage and terrestrial Si cycling in the Arctic.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
amorphous Si storage, circum-Arctic tundra, landscape distribution, permafrost, upscaling, wetland
in
Global Biogeochemical Cycles
volume
30
issue
3
pages
22 pages
publisher
American Geophysical Union
external identifiers
  • Scopus:84960969833
ISSN
0886-6236
DOI
10.1002/2015GB005344
language
English
LU publication?
yes
id
93a21774-8910-427b-83b6-1e0e17bb51d1
date added to LUP
2016-07-14 12:16:34
date last changed
2016-07-14 12:16:34
@misc{93a21774-8910-427b-83b6-1e0e17bb51d1,
  abstract     = {<p>We investigated the vertical distribution, storage, landscape partitioning, and spatial variability of soil amorphous silica (ASi) at four different sites underlain by continuous permafrost and representative of mountainous and lowland tundra, in the circum-Arctic region. Based on a larger set of data, we present the first estimate of the ASi soil reservoir (0-1 m depth) in circum-Arctic tundra terrain. At all sites, the vertical distribution of ASi concentrations followed the pattern of either (1) declining concentrations with depth (most common) or (2) increasing/maximum concentrations with depth. Our results suggest that a set of processes, including biological control, solifluction and other slope processes, cryoturbation, and formation of inorganic precipitates influence vertical distributions of ASi in permafrost terrain, with the capacity to retain stored ASi on millennial timescales. At the four study sites, areal ASi storage (0-1 m) is generally higher in graminoid tundra compared to wetlands. Our circum-Arctic upscaling estimates, based on both vegetation and soil classification separately, suggest a storage amounting to 219 ± 28 and 274 ± 33 Tmol Si, respectively, of which at least 30% is stored in permafrost. This estimate would account for about 3% of the global soil ASi storage while occupying an equal portion of the global land area. This result does not support the hypothesis that the circum-Arctic tundra soil ASi reservoir contains relatively higher amounts of ASi than other biomes globally as demonstrated for carbon. Nevertheless, climate warming has the potential to significantly alter ASi storage and terrestrial Si cycling in the Arctic.</p>},
  author       = {Alfredsson, H. and Clymans, W. and Hugelius, G. and Kuhry, P. and Conley, D. J.},
  issn         = {0886-6236},
  keyword      = {amorphous Si storage,circum-Arctic tundra,landscape distribution,permafrost,upscaling,wetland},
  language     = {eng},
  month        = {03},
  number       = {3},
  pages        = {479--500},
  publisher    = {ARRAY(0xbd06be0)},
  series       = {Global Biogeochemical Cycles},
  title        = {Estimated storage of amorphous silica in soils of the circum-Arctic tundra region},
  url          = {http://dx.doi.org/10.1002/2015GB005344},
  volume       = {30},
  year         = {2016},
}