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Non-methane biogenic volatile organic compound emissions from a subarctic peatland under enhanced UV-B radiation

Faubert Patrick, Tiiva Päivi, Rinnan Åsmund, Räsänen Janne, Holopainen Jarmo K., Holopainen Toini, Kyrö Esko et Rinnan Riikka. (2010). Non-methane biogenic volatile organic compound emissions from a subarctic peatland under enhanced UV-B radiation. Ecosystems, 13, (6), p. 860-873.

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URL officielle: http://dx.doi.org/doi:10.1007/s10021-010-9362-1

Résumé

Boreal and subarctic peatlands have been extensively studied for their major role in the global carbon balance. However, study efforts have so far neglected the contribution of these ecosystems to the non-methane biogenic volatile organic compound (BVOC) emissions, which are important in the atmospheric chemistry and feedbacks on climate change. We aimed at estimating the BVOC emissions from a subarctic peatland in northern Finland. Furthermore, our aim was to assess how these emissions are affected by enhanced UV-B radiation, the amount of which has increased especially at high latitudes as a result of stratospheric ozone depletion. The contribution of BVOC emissions to the total net carbon exchange and correlations between the emission of different BVOCs and net ecosystem CO2 exchange, CH4 emission, total green leaf area, and abiotic factors were also studied. The UV-B exposure, simulating a 20% depletion of stratospheric ozone, was started in 2003, and measurements were per- formed during the growing seasons of 2006 and 2008. The subarctic peatland proved to be a small source of BVOCs and the dominant moss, Warnstorfla exannulata, emitted a diverse compound spectrum. The water table level exerted a major influence on the BVOC emissions surpassing the effect of enhanced UV-B. In fact, no overall UV-B effect was established on the BVOC emissions, apart from toluene and 1-octene, emissions of which were doubled and tripled by enhanced UV-B in 2008, respectively. The contribution of BVOCs to the total net carbon exchange was below 1 %.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1432-9840
Volume:13
Numéro:6
Pages:p. 860-873
Version évaluée par les pairs:Oui
Date:2010
Identifiant unique:10.1007/s10021-010-9362-1
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:BVOC, biogenic volatile organic compound, isoprene, ozone depletion, UV-B radiation, water table, carbon exchange, Subarctic, peatland, carbon dioxide, methane, réduction de l'ozone, nappe phréatique, échange de carbone, subarctique, tourbière, gaz carbonique, composé organique volatile biogène
Informations complémentaires:Contact: Patrick1_Faubert@uqac.ca
Déposé le:03 févr. 2021 18:04
Dernière modification:03 févr. 2021 18:04
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