Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F24%3A43908781" target="_blank" >RIV/60076658:12310/24:43908781 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s10533-024-01132-4" target="_blank" >https://link.springer.com/article/10.1007/s10533-024-01132-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10533-024-01132-4" target="_blank" >10.1007/s10533-024-01132-4</a>

Result language

angličtina

Original language name

Permafrost degradation and its consequences for carbon storage in soils of Interior Alaska

Original language description

Permafrost soils in the northern hemisphere are known to harbor large amounts of soil organic matter (SOM). Global climate warming endangers this stable soil organic carbon (SOC) pool by triggering permafrost thaw and deepening the active layer, while at the same time progressing soil formation. But depending, e.g., on ice content or drainage, conditions in the degraded permafrost can range from water-saturated/anoxic to dry/oxic, with concomitant shifts in SOM stabilizing mechanisms. In this field study in Interior Alaska, we investigated two sites featuring degraded permafrost, one water-saturated and the other well-drained, alongside a third site with intact permafrost. Soil aggregate- and density fractions highlighted that permafrost thaw promoted macroaggregate formation, amplified by the incorporation of particulate organic matter, in topsoils of both degradation sites, thus potentially counteracting a decrease in topsoil SOC induced by the permafrost thawing. However, the subsoils were found to store notably less SOC than the intact permafrost in all fractions of both degradation sites. Our investigations revealed up to net 75% smaller SOC storage in the upper 100 cm of degraded permafrost soils as compared to the intact one, predominantly related to the subsoils, while differences between soils of wet and dry degraded landscapes were minor. This study provides evidence that the consideration of different permafrost degradation landscapes and the employment of soil fractionation techniques is a useful combination to investigate soil development and SOM stabilization processes in this sensitive ecosystem.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

40104 - Soil science

Project

<a href="/en/project/GC20-21259J" target="_blank" >GC20-21259J: CRYOVULCAN - Vulnerability of carbon in Cryosols – substrate-microorganisms-aggregate interactions</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Biogeochemistry

ISSN

0168-2563

e-ISSN

—

Volume of the periodical

167

Issue of the periodical within the volume

3

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

25

Pages from-to

199-223

UT code for WoS article

001178221600002

EID of the result in the Scopus database

2-s2.0-85186885103