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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

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

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

FEMS Microbiology Ecology

ISSN

0168-6496

e-ISSN

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Svazek periodika

92

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

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Kód UT WoS článku

000383898400013

EID výsledku v databázi Scopus

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