Contribution of vegetation and water table on isoprene emission from boreal peatland microcosms |
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| Authors: | Päivi Tiiva Patrick Faubert Sanna Räty Jarmo K Holopainen Toini Holopainen Riikka Rinnan |
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| Institution: | 1. Department of Environmental Science, University of Kuopio, PO box 1627, FI-70211 Kuopio, Finland;2. Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark;1. Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, I-50019 Sesto F.no, Florence, Italy;2. Department of Physics and Astronomy, University of Florence and I.N.F.N., Florence, Via G. Sansone 1, I-50019 Sesto F.no, Florence, Italy;1. Department of Physics and Astronomy, University of Florence and National Institute of Nuclear Physics (INFN), Via G. Sansone 1, 50019 Sesto Fiorentino (Fi), Italy;2. Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (Fi), Italy;1. National Key Laboratory of Crop Genetic Improvement, Huazhong Agriculture University, Wuhan 430070, China;2. Biomass and Bioenergy Research Centre, Huazhong Agriculture University, Wuhan 430070, China;3. College of Plant Science and Technology, Huazhong Agriculture University, Wuhan 430070, China;4. Institute of Food Crops, Hubei Academy of Agricultural Sciences, 3 Nanhu Road, Wuhan 430064, China;5. Department of Plant Science, North Dakota State University, Loftsgard Hall, P.O. Box 6050, Fargo, ND 58108, USA;1. Department of Agricultural and Biosystems Engineering, Iowa State University, 3326B Elings Hall, Ames, IA, 50011, United States;2. Department of Agricultural and Biosystems Engineering, Iowa State University, 3327 Elings Hall, Ames, IA, 50011, United States;1. Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan;2. Mount Fuji Research Institute, Yamanashi Prefectural Government (MFRI), Kenmarubi 5597-1, Kamiyoshida, Fujiyoshida City, Yamanashi 403-0005, Japan |
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| Abstract: | Boreal peatlands are substantial sources of isoprene, a reactive hydrocarbon. However, it is not known how much mosses, vascular plants and peat each contribute to isoprene emission from peatlands. Furthermore, there is no information on the effects of declining water table depth on isoprene emission in these naturally wet ecosystems, although water table is predicted to decline due to climate warming. We studied the relative contribution of mosses vs. vascular plants to isoprene emission in boreal peatland microcosms in growth chambers by removing either vascular vegetation or both vascular vegetation and mosses. The microcosms represented wet hollows and dry hummocks of a boreal ombrotrophic bog. A water table drawdown treatment was applied to the hollows with naturally high water table. The mean (±SE) isoprene emission from hummocks with intact vegetation, 30 ± 6 μg m?2 h?1, was decreased by over 90% with removal of vascular plants or all vegetation. Thus, our results indicate that vascular plants, in contrast to mosses, were the main source of isoprene in the studied peatland ecosystem. Water table drawdown also significantly decreased the emissions; the mean isoprene emission from hollows with intact vegetation, 45 ± 6 μg m?2 h?1, was decreased by 25% under water table drawdown. However, water table drawdown reduced net ecosystem carbon dioxide (CO2) exchange more dramatically than isoprene emission. Isoprene emission strongly correlated with both CO2 exchange and methane emission. In conclusion, isoprene emissions from peatlands will decrease, but the proportion of assimilated carbon lost as isoprene will increase, if the naturally high water table declines under the changing climate. |
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