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Climate change‐induced vegetation change as a driver of increased subarctic biogenic volatile organic compound emissions

Valolahti Hanna, Kivimäenpää Minna, Faubert Patrick, Michelsen Anders et Rinnan Riikka. (2015). Climate change‐induced vegetation change as a driver of increased subarctic biogenic volatile organic compound emissions. Global Change Biology, 21, (9), p. 3478-3488.

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URL officielle: http://dx.doi.org/doi:10.1111/gcb.12953

Résumé

Emissions of biogenic volatile organic compounds (BVOCs) have been earlier shown to be highly temperature sensitive in subarctic ecosystems. As these ecosystems experience rapidly advancing pronounced climate warming, we aimed to investigate how warming affects the BVOC emissions in the long term (up to 13 treatment years). We also aimed to assess whether the increased litterfall resulting from the vegetation changes in the warming subarctic would affect the emissions. The study was conducted in a field experiment with factorial open‐top chamber warming and annual litter addition treatments on subarctic heath in Abisko, northern Sweden. After 11 and 13 treatment years, BVOCs were sampled from plant communities in the experimental plots using a push–pull enclosure technique and collection into adsorbent cartridges during the growing season and analyzed with gas chromatography–mass spectrometry. Plant species coverage in the plots was analyzed by the point intercept method. Warming by 2 °C caused a 2‐fold increase in monoterpene and 5‐fold increase in sesquiterpene emissions, averaged over all measurements. When the momentary effect of temperature was diminished by standardization of emissions to a fixed temperature, warming still had a significant effect suggesting that emissions were also indirectly increased. This indirect increase appeared to result from increased plant coverage and changes in vegetation composition. The litter addition treatment also caused significant increases in the emission rates of some BVOC groups, especially when combined with warming. The combined treatment had both the largest vegetation changes and the highest BVOC emissions. The increased emissions under litter addition were probably a result of a changed vegetation composition due to alleviated nutrient limitation and stimulated microbial production of BVOCs. We suggest that the changes in the subarctic vegetation composition induced by climate warming will be the major factor indirectly affecting the BVOC emission potentials and composition.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1354-1013
Volume:21
Numéro:9
Pages:p. 3478-3488
Version évaluée par les pairs:Oui
Date:2015
Identifiant unique:10.1111/gcb.12953
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:Arctic, biogenic volatile organic compounds, BVOCs, climate change, isoprene, monoterpene, plant volatiles, sesquiterpene, temperature, vegetation change
Déposé le:02 févr. 2021 23:02
Dernière modification:02 févr. 2021 23:02
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Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

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