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• W3179667119 abstract "The rapid climate warming in Arctic regions has inducedextensive permafrost thawing and the consequent mobilizationof a large reservoir of organic carbon that was frozen formillennia. Although the release of this old carbon into theatmosphere, either as carbon dioxide (CO2) or methane (CH4),acts as a positive feedback mechanism to global warming, verylittle is known about the extent and rate of the gas release andthe biochemical processes involved as the different carbonpools are becoming available to ecosystems of Arctic lakes andponds. As a part of an interdisciplinary project investigatingthe influence of geomorphological and limnological factorson GHG emissions from lakes and ponds on Bylot Island,Nunavut, the present study aims to determine the lability andaccessibility of the different carbon pools to microorganisms.In 2014, lability experiments were performed on four sedimenttypes found in organic-rich polygonal patterned groundlandscape and possessing specific characteristics (e.g., annualthermal regime, C/N ratio): upper-half portion of the activelayer, lower-half of the active layer, permafrost, and thermokarstlake sediment. The different soil samples were incubatedin-situ in shaded conditions, in one of the shallow tundraponds. These incubation tests were repeated in controlled andstable temperature conditions in laboratory. Leachates werealso produced from the same soils and incubated similarlyboth in the field and in the laboratory. Dissolved oxygen (O2)and headspace CH4 and CO2 concentrations were measuredregularly over a period of up to two weeks, and the rates ofconsumption or production were calculated. Preliminaryresults show that O2 consumption rates were higher in upperactive layer samples, while it depleted more slowly in otherincubations, suggesting the presence of active aerobic consumersof organic matter in active layer soils naturally exposed to O2.On the other hand, the production of CO2 was faster in lakesediments, whereas permafrost soils showed highest rates ofCH4 production and lowest rates of CO2 production, possiblyindicating a variable balance between different CH4 pathwaysin soils that are naturally anaerobic. Overall, the rates of CO2production were not inversely correlated to O2 consumptionrates, suggesting complex microbial communities inhabitingdifferent niches in such Arctic landscapes, with a wide range ofpossible responses to the expected increase in carbon availabilityas permafrost thaws. These results also indicate the need toemploy a wider array of indicators to assess C lability of Arcticsoils." @default.
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• W3179667119 date "2014-01-01" @default.
• W3179667119 modified "2023-10-18" @default.
• W3179667119 title "Greenhouse Gas Emissions From Arctic Lakes And Ponds As Influenced By Carbon Lability." @default.
• W3179667119 hasPublicationYear "2014" @default.
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