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Seasonal dynamics of stem N2O exchange follow the physiological activity of boreal trees
K. Machacova, E. Vainio, O. Urban, M. Pihlatie,
Language English Country Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
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- MeSH
- Atmosphere chemistry MeSH
- Ecosystem * MeSH
- Methane metabolism MeSH
- Nitrous Oxide metabolism MeSH
- Carbon Dioxide metabolism MeSH
- Soil chemistry MeSH
- Seasons * MeSH
- Plant Stems metabolism MeSH
- Trees physiology MeSH
- Taiga * MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Geographicals
- Finland MeSH
The role of trees in the nitrous oxide (N2O) balance of boreal forests has been neglected despite evidence suggesting their substantial contribution. We measured seasonal changes in N2O fluxes from soil and stems of boreal trees in Finland, showing clear seasonality in stem N2O flux following tree physiological activity, particularly processes of CO2 uptake and release. Stem N2O emissions peak during the vegetation season, decrease rapidly in October, and remain low but significant to the annual totals during winter dormancy. Trees growing on dry soils even turn to consumption of N2O from the atmosphere during dormancy, thereby reducing their overall N2O emissions. At an annual scale, pine, spruce and birch are net N2O sources, with spruce being the strongest emitter. Boreal trees thus markedly contribute to the seasonal dynamics of ecosystem N2O exchange, and their species-specific contribution should be included into forest emission inventories.
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- $a Machacova, Katerina $u Global Change Research Institute of the Czech Academy of Sciences, Belidla 4a, CZ-60300, Brno, Czech Republic. machacova.k@czechglobe.cz.
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- $a The role of trees in the nitrous oxide (N2O) balance of boreal forests has been neglected despite evidence suggesting their substantial contribution. We measured seasonal changes in N2O fluxes from soil and stems of boreal trees in Finland, showing clear seasonality in stem N2O flux following tree physiological activity, particularly processes of CO2 uptake and release. Stem N2O emissions peak during the vegetation season, decrease rapidly in October, and remain low but significant to the annual totals during winter dormancy. Trees growing on dry soils even turn to consumption of N2O from the atmosphere during dormancy, thereby reducing their overall N2O emissions. At an annual scale, pine, spruce and birch are net N2O sources, with spruce being the strongest emitter. Boreal trees thus markedly contribute to the seasonal dynamics of ecosystem N2O exchange, and their species-specific contribution should be included into forest emission inventories.
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- $a Vainio, Elisa $u Environmental Soil Science, Department of Agricultural Sciences, University of Helsinki, P.O.Box 56, FI-00014, Helsinki, Finland. Institute for Atmospheric and Earth System Research/Forest Sciences, University of Helsinki, P.O.Box 27, FI-00014, Helsinki, Finland.
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- $a Pihlatie, Mari $u Environmental Soil Science, Department of Agricultural Sciences, University of Helsinki, P.O.Box 56, FI-00014, Helsinki, Finland. Institute for Atmospheric and Earth System Research/Forest Sciences, University of Helsinki, P.O.Box 27, FI-00014, Helsinki, Finland. Viikki Plant Science Centre (ViPS), University of Helsinki, P.O.Box 56, FI-00014, Helsinki, Finland.
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