Seasonal dynamics of stem N2O exchange follow the physiological activity of boreal trees

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http://hdl.handle.net/10138/308552

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Machacova , K , Vainio , E , Urban , O & Pihlatie , M 2019 , ' Seasonal dynamics of stem N2O exchange follow the physiological activity of boreal trees ' , Nature Communications , vol. 10 , 4989 . https://doi.org/10.1038/s41467-019-12976-y

Title: Seasonal dynamics of stem N2O exchange follow the physiological activity of boreal trees
Author: Machacova, Katerina; Vainio, Elisa; Urban, Otmar; Pihlatie, Mari
Contributor: University of Helsinki, Methane and nitrous oxide exchange of forests
University of Helsinki, Department of Agricultural Sciences
Date: 2019-11-01
Language: eng
Number of pages: 13
Belongs to series: Nature Communications
ISSN: 2041-1723
URI: http://hdl.handle.net/10138/308552
Abstract: 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.
Subject: 4112 Forestry
1172 Environmental sciences
NITROUS-OXIDE EMISSIONS
EDDY COVARIANCE
SCOTS PINE
CARBON-DIOXIDE
CH4 EMISSIONS
CO2 EXCHANGE
PLANT-GROWTH
FOREST
SOIL
METHANE
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