DOI: 10.1002/2015GB005344
Scopus记录号: 2-s2.0-84960969833
论文题名: Estimated storage of amorphous silica in soils of the circum-Arctic tundra region
作者: Alfredsson H ; , Clymans W ; , Hugelius G ; , Kuhry P ; , Conley D ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 3 起始页码: 479
结束页码: 500
语种: 英语
英文关键词: amorphous Si storage
; circum-Arctic tundra
; landscape distribution
; permafrost
; upscaling
; wetland
Scopus关键词: biological control
; biome
; carbon
; concentration (composition)
; permafrost
; precipitation (chemistry)
; silica
; soil classification
; timescale
; tundra soil
; upscaling
; vertical distribution
; wetland
; Arctic
英文摘要: 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. ©2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77873
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geology, Lund University, Lund, Sweden; Department of Physical Geography, Stockholm University, Stockholm, Sweden
Recommended Citation:
Alfredsson H,, Clymans W,, Hugelius G,et al. Estimated storage of amorphous silica in soils of the circum-Arctic tundra region[J]. Global Biogeochemical Cycles,2016-01-01,30(3)