Heterogeneity of carbon loss and its temperature sensitivity in East-European subarctic tundra soils

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F16%3A43890963" target="_blank" >RIV/60076658:12310/16:43890963 - isvavai.cz</a>

Result on the web

<a href="https://academic.oup.com/femsec/article-lookup/doi/10.1093/femsec/fiw140" target="_blank" >https://academic.oup.com/femsec/article-lookup/doi/10.1093/femsec/fiw140</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/femsec/fiw140" target="_blank" >10.1093/femsec/fiw140</a>

Result language

angličtina

Original language name

Heterogeneity of carbon loss and its temperature sensitivity in East-European subarctic tundra soils

Original language description

Arctic peatlands store large stocks of organic carbon which are vulnerable to the climate change but their fate is uncertain. There is increasing evidence that a part of it will be lost as a result of faster microbial mineralization. We studied the vulnerability of 3500-5900 years old bare peat uplifted from permafrost layers by cryogenic processes to the surface of an arctic peat plateau. We aimed to find biotic and abiotic drivers of C-LOSS from old peat and compare them with those of adjacent, young vegetated soils of the peat plateau and mineral tundra. The soils were incubated in laboratory at three temperatures (4A degrees C, 12A degrees C and 20A degrees C) and two oxygen levels (aerobic, anaerobic). C-LOSS was monitored and soil parameters (organic carbon quality, nutrient availability, microbial activity, biomass and stoichiometry, and extracellular oxidative and hydrolytic enzyme pools) were determined. We found that C-LOSS from the old peat was constrained by low microbial biomass representing only 0.22% of organic carbon. C-LOSS was only slightly reduced by the absence of oxygen and exponentially increased with temperature, showing the same temperature sensitivity under both aerobic and anaerobic conditions. We conclude that carbon in the old bare peat is stabilized by a combination of physical, chemical and biological controls including soil compaction, organic carbon quality, low microbial biomass and the absence of plants.Decomposition of old organic deposits in arctic peatlands is slow due to scarcity of microorganisms there but is highly sensitive to temperature increase, even under anaerobic conditions.Decomposition of old organic deposits in arctic peatlands is slow due to scarcity of microorganisms there but is highly sensitive to temperature increase, even under anaerobic conditions.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DD - Geochemistry

OECD FORD branch

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Project

<a href="/en/project/7E10073" target="_blank" >7E10073: Long-term Carbon Storage in Cryoturbeated Arctic Soils</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2016

Confidentiality

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

Name of the periodical

FEMS Microbiology Ecology

ISSN

0168-6496

e-ISSN

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Volume of the periodical

92

Issue of the periodical within the volume

9

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

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UT code for WoS article

000383898400013

EID of the result in the Scopus database

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