| Title: | Bidirectional Exchange of Biogenic Volatile Organic Compounds in Subarctic Heath Mesocosms During Autumn Climate Scenarios |
| Author(s): | Baggesen NS; Davie-Martin CL; Seco R; Holst T; Rinnan R; |
| Address: | "Terrestrial Ecology Section, Department of Biology University of Copenhagen Copenhagen O Denmark. Center for Permafrost (CENPERM) University of Copenhagen Copenhagen K Denmark. Institute of Environmental Assessment and Water Research (IDAEA-CSIC) Barcelona Spain. Department of Physical Geography and Ecosystem Science Lund University Lund Sweden" |
| ISSN/ISBN: | 2169-8953 (Print) 2169-8961 (Electronic) 2169-8953 (Linking) |
| Abstract: | "Biogenic volatile organic compound (BVOC) flux dynamics during the subarctic autumn are largely unexplored and have been considered insignificant due to the relatively low biological activity expected during autumn. Here, we exposed subarctic heath ecosystems to predicted future autumn climate scenarios (ambient, warming, and colder, dark conditions), changes in light availability, and flooding, to mimic the more extreme rainfall or snowmelt events expected in the future. We used climate chambers to measure the net ecosystem fluxes and bidirectional exchange of BVOCs from intact heath mesocosms using a dynamic enclosure technique coupled to a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS). We focused on six BVOCs (methanol, acetic acid, acetaldehyde, acetone, isoprene, and monoterpenes) that were among the most dominant and that were previously identified in arctic tundra ecosystems. Warming increased ecosystem respiration and resulted in either net BVOC release or increased uptake compared to the ambient scenario. None of the targeted BVOCs showed net release in the cold and dark scenario. Acetic acid exhibited significantly lower net uptake in the cold and dark scenario than in the ambient scenario, which suggests reduced microbial activity. Flooding was characterized by net uptake of the targeted BVOCs and overruled any temperature effects conferred by the climate scenarios. Monoterpenes were mainly taken up by the mesocosms and their fluxes were not affected by the climate scenarios or flooding. This study shows that although autumn BVOC fluxes on a subarctic heath are generally low, changes in future climate may strongly modify them" |
| Keywords: | arctic autumn ecosystem-atmosphere interactions flooding global change volatile organic compound; |
| Notes: | "PubMed-not-MEDLINEBaggesen, Nanna S Davie-Martin, Cleo L Seco, Roger Holst, Thomas Rinnan, Riikka eng 2022/07/23 J Geophys Res Biogeosci. 2022 Jun; 127(6):e2021JG006688. doi: 10.1029/2021JG006688. Epub 2022 Jun 20" |
