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Non-Methane Biogenic Volatile Organic Compound Emissions from a Subarctic Peatland Under Enhanced UV-B Radiation

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Abstract

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 performed during the growing seasons of 2006 and 2008. The subarctic peatland proved to be a small source of BVOCs and the dominant moss, Warnstorfia 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%.

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Acknowledgements

We thank Timo Oksanen for constructing the equipment, Juhani Tarhanen for assistance in the GC–MS analyses, Hanne Suokanerva for the maintenance of the field experiment, and Mia Åberg and Santtu Turunen for the data collection in the field. We are also thankful to Professors Roger Atkinson and Magda Claeys for their valuable contribution to the compound classification. The study was financially supported by Emil Aaltonen Foundation and Academy of Finland (decisions 202300 and 200884), and the research fellowships awarded to Patrick Faubert by FQRNT, North Savo Regional Fund of the Finnish Cultural Foundation and Ella and Georg Ehrnrooth Foundation.

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Authors and Affiliations

  1. Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211, Kuopio, Finland

    Patrick Faubert, Päivi Tiiva, Janne Räsänen, Jarmo K. Holopainen, Toini Holopainen & Riikka Rinnan

  2. Quality and Technology, Department of Food Science, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 30, 1958, Frederiksberg C, Denmark

    Åsmund Rinnan

  3. Terrestrial Ecology Section, Department of Biology, Faculty of Science, University of Copenhagen, Øster Farimagsgade 2D, 1353, Copenhagen K, Denmark

    Riikka Rinnan

  4. Finnish Meteorological Institute, Arctic Research Center, FI-99600, Sodankylä, Finland

    Esko Kyrö

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  1. Patrick Faubert
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  2. Päivi Tiiva
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  3. Åsmund Rinnan
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Correspondence to Patrick Faubert.

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Author contributions

P. F. contributed to the field work, data analysis and wrote the paper. P. T. contributed to the field work, data analysis and writing. Å. R. contributed to the methods in the data analysis and writing. J. R. contributed to the field work and data analysis. J. K. H., T. H. and E.K. conceived and designed the study and contributed to the writing. R. R. conceived and designed the study, contributed to the field work, data analysis and writing.

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Faubert, P., Tiiva, P., Rinnan, Å. et al. Non-Methane Biogenic Volatile Organic Compound Emissions from a Subarctic Peatland Under Enhanced UV-B Radiation. Ecosystems 13, 860–873 (2010). https://doi.org/10.1007/s10021-010-9362-1

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