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The shift in plant species composition in a subarctic mountain birch forest floor due to climate change would modify the biogenic volatile organic compound emission profile

Faubert Patrick, Tiiva Päivi, Michelsen Anders, Rinnan Åsmund, Ro-Poulsen Helge et Rinnan Riikka. (2012). The shift in plant species composition in a subarctic mountain birch forest floor due to climate change would modify the biogenic volatile organic compound emission profile. Plant and Soil, 352, (1-2), p. 199-215.

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URL officielle: https://dx.doi.org/doi:10.1007/s11104-011-0989-2

Résumé

Background and aims: Mountain birch forests dominate in the Subarctic but little is known of their nonmethane biogenic volatile organic compound (BVOC) emissions. The dwarf shrubs Empetrum hermaphroditum, Vaccinium myrtillus and Vaccinium uliginosum co-dominate in the forest floors of these forests. The abundance of these three dwarf shrubs relative to each other could be affected by climate warming expected to increase nutrient availability by accelerating litter decomposition and nutrient mineralization. We 1) compared the BVOC emission profiles of vegetation covers dominated by E. hermaphroditum and V. myrtillus plus V. uliginosum in a subarctic mountain birch forest floor, 2) distinguished the BVOCs emitted from plants and soil and 3) measured how the BVOC emissions from the different vegetation covers differed under darkness.

Methods: BVOCs were sampled during two growing seasons using a conventional ecosystem chamberbased method, collected on adsorbent and analyzed with gas chromatography–mass spectrometry.

Results: High abundance of E. hermaphroditum increased the sesquiterpene emissions. Soil released fewer different BVOCs than controls (i.e. natural vegetation) but the total emission rates were similar. Darkness did not affect the emissions. Carbon emitted as BVOCs was less than 0.2% of the CO2 exchange.

Conclusions: Our results suggest that sesquiterpene emissions from subarctic mountain birch forest floors would be reduced following an increased abundance of V. myrtillus and V. uliginosum with climate change because these species respond rapidly to increased nutrient availability.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0032-079X
Volume:352
Numéro:1-2
Pages:p. 199-215
Version évaluée par les pairs:Oui
Date:2012
Identifiant unique:10.1007/s11104-011-0989-2
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
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, Subarctic, Betula pubescens ssp. czerepanovii, Empetrum nigrum ssp. hermaphroditum, Vaccinium myrtillus, Vaccinium uliginosum, composé organique volatile biogène, Subarctique
Informations complémentaires:Contact: Patrick1_Faubert@uqac.ca
Déposé le:02 févr. 2021 23:17
Dernière modification:02 févr. 2021 23:17
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