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Non-methane biogenic volatile organic compound emissions from boreal peatland microcosms under warming and water table drawdown

Faubert Patrick, Tiiva Päivi, Nakam Tchamga Achille, Holopainen Jarmo K., Holopainen Toini et Rinnan Riikka. (2011). Non-methane biogenic volatile organic compound emissions from boreal peatland microcosms under warming and water table drawdown. Biogeochemistry, 106, (3), p. 503-516.

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URL officielle: https://dx.doi.org/doi:10.1007/s10533-011-9578-y

Résumé

Boreal peatlands have significant emissions of non-methane biogenic volatile organic compounds (BVOCs). Climate warming is expected to affect these ecosystems both directly, with increasing temperature, and indirectly, through water table drawdown following increased evapotranspiration. We assessed the combined effect of warming and water table drawdown on the BVOC emissions from boreal peatland microcosms. We also assessed the treatment effects on the BVOC emissions from the peat soil after the 7-week long experiment. Emissions of isoprene, monoterpenes, sesquiterpenes, other reactive VOCs and other VOCs were sampled using a conventional chamber technique, collected on adsorbent and analyzed by GC–MS. Carbon emitted as BVOCs was less than 1% of the CO2 uptake and up to 3% of CH4 emission. Water table drawdown surpassed the direct warming effect and significantly decreased the emissions of all BVOC groups. Only isoprene emission was significantly increased by warming, parallel to the increased leaf number of the dominant sedge Eriophorum vaginatum. BVOC emissions from peat soil were higher under the control and warming treatments than water table drawdown, suggesting an increased activity of anaerobic microbial community. Our results suggest that boreal peatlands could have concomitant negative and positive radiative forcing effects on climate warming following the effect of water table drawdown. The observed decrease in CH4 emission causes a negative radiative forcing while the increase in CO2 emission and decrease in reactive BVOC emissions, which could reduce the cooling effect induced by the lower formation rate of secondary organic aerosols, both contribute to increased radiative forcing.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0168-2563
Volume:106
Numéro:3
Pages:p. 503-516
Version évaluée par les pairs:Oui
Date:2011
Identifiant unique:10.1007/s10533-011-9578-y
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Isoprene, monoterpene, sesquiterpene, BVOC, biogenic volatile organic compound, climate warming, bog, composé organique volatile biogène, réchauffement climatique, tourbière oligotrophe
Informations complémentaires:Contact: Patrick1_Faubert@uqac.ca
Déposé le:03 févr. 2021 17:45
Dernière modification:03 févr. 2021 17:45
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