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| Titel |
Low below-ground organic carbon storage in a subarctic Alpine permafrost environment |
| VerfasserIn |
M. Fuchs, P. Kuhry, G. Hugelius |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 2 ; Nr. 9, no. 2 (2015-03-02), S.427-438 |
| Datensatznummer |
250116760
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| Publikation (Nr.) |
 copernicus.org/tc-9-427-2015.pdf |
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| Zusammenfassung |
| This study investigates the soil organic carbon (SOC) storage in Tarfala
Valley, northern Sweden. Field inventories, upscaled based on land cover, show
that this alpine permafrost environment does not store large amounts of SOC,
with an estimate mean of 0.9 ± 0.2 kg C m−2 for the upper meter
of soil. This is 1 to 2 orders of magnitude lower than what has been
reported for lowland permafrost terrain. The SOC storage varies for
different land cover classes and ranges from 0.05 kg C m−2 for
stone-dominated to 8.4 kg C m−2 for grass-dominated areas. No signs of
organic matter burial through cryoturbation or slope processes were found,
and radiocarbon-dated SOC is generally of recent origin (<2000 cal yr BP).
An inventory of permafrost distribution in Tarfala Valley, based on the
bottom temperature of snow measurements and a logistic regression model,
showed that at an altitude where permafrost is probable the SOC storage is
very low. In the high-altitude permafrost zones (above 1500 m), soils store
only ca. 0.1 kg C m−2. Under future climate warming, an upward shift of
vegetation zones may lead to a net ecosystem C uptake from increased biomass
and soil development. As a consequence, alpine permafrost environments could
act as a net carbon sink in the future, as there is no loss of older or
deeper SOC from thawing permafrost. |
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