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
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Background and aims
Mountain birch forests dominate in the Subarctic but little is known of their non-methane 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.
BVOCs were sampled during two growing seasons using a conventional ecosystem chamber-based method, collected on adsorbent and analyzed with gas chromatography–mass spectrometry.
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.
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.
KeywordsBVOC Subarctic Betula pubescens ssp. czerepanovii Empetrum nigrum ssp. hermaphroditum Vaccinium myrtillus Vaccinium uliginosum
We thank Susan Owen for her comments that improved this paper, T. Oksanen for constructing the equipment and J. Tarhanen for assistance in the GC-MS analyses. The study was financially supported by the Emil Aaltonen Foundation, an EU ATANS grant (Fp6 506004), the Danish Council for Independent Research | Natural Sciences and the Abisko Scientific Research Station. P.F. acknowledges the support from the FQRNT, North Savo Regional Fund of the Finnish Cultural Foundation and Ella and Georg Ehrnrooth Foundation.
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