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

Author

Listed:
  • Katerina Machacova

    (Global Change Research Institute of the Czech Academy of Sciences)

  • Elisa Vainio

    (University of Helsinki
    University of Helsinki)

  • Otmar Urban

    (Global Change Research Institute of the Czech Academy of Sciences)

  • Mari Pihlatie

    (University of Helsinki
    University of Helsinki
    University of Helsinki)

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.

Suggested Citation

  • Katerina Machacova & Elisa Vainio & Otmar Urban & Mari Pihlatie, 2019. "Seasonal dynamics of stem N2O exchange follow the physiological activity of boreal trees," Nature Communications, Nature, vol. 10(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12976-y
    DOI: 10.1038/s41467-019-12976-y
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    Cited by:

    1. Yihao Wang & Xiande Zhao & Daming Dong & Chunjiang Zhao & Feng Bao & Rui Guo & Fangxu Zhu & Leizi Jiao, 2023. "Methane Exchange Flux Monitoring between Potential Source Sewage Inspection Wells and the Atmosphere Based on Laser Spectroscopy Method," Sustainability, MDPI, vol. 15(24), pages 1-15, December.

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