Tiiva Päivi, Rinnan Riikka, Faubert Patrick, Räsänen Janne, Holopainen Toini, Kyrö Esko et Holopainen Jarmo K. (2007). Isoprene emission from a subarctic peatland under enhanced UV-B radiation. New Phytologist, 176, (2), p. 346-355.
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URL officielle: http://dx.doi.org/doi:10.1111/j.1469-8137.2007.021...
Résumé
Isoprene is a reactive hydrocarbon with an important role in atmospheric chemistry, and emissions from vegetation contribute to atmospheric carbon fluxes. The magnitude of isoprene emissions from arctic peatlands is not known, and it may be altered by increasing UV-B radiation. Isoprene emission was measured with the dynamic chamber method from a subarctic peatland under long-term enhancement of UV-B radiation targeted to correspond to a 20% loss in the stratospheric ozone layer. The site type of the peatland was a flark fen dominated by the moss Warnstorfia exannulata and sedges Eriophorum russeolum and Carex limosa. The relationship between species densities and the emission was also assessed. Isoprene emissions were significantly increased by enhanced UV-B radiation during the second (2004) and the fourth (2006) growing seasons under the UV-B exposure. Emissions were related to the density of E. russeolum. The dominant moss, W. exannulata, proved to emit small amounts of isoprene in a laboratory trial. Subarctic fens, even without Sphagnum moss, are a significant source of isoprene to the atmosphere, especially under periods of warm weather. Warming of the Arctic together with enhanced UV-B radiation may substantially increase the emissions.
Type de document: | Article publié dans une revue avec comité d'évaluation |
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ISSN: | 0028-646X |
Volume: | 176 |
Numéro: | 2 |
Pages: | p. 346-355 |
Version évaluée par les pairs: | Oui |
Date: | 2007 |
Identifiant unique: | 10.1111/j.1469-8137.2007.02164.x |
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: | Eriophorum russeolum, isoprene, peatland, UV-B radiation, volatile organic compound, VOC, Warnstorfia exannulata, tourbière, rayonnement UV-B, composé organique volatil, COV |
Informations complémentaires: | Contact: Patrick1_Faubert@uqac.ca |
Déposé le: | 22 janv. 2021 00:39 |
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Dernière modification: | 22 janv. 2021 13:18 |
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