Forest canopy mitigates soil N2O emission during hot moments

Ülo Mander*, Alisa Krasnova, Jordi Escuer-Gatius, Mikk Espenberg, Thomas Schindler, Katerina Machacova, Jaan Pärn, Martin Maddison, J. Patrick Megonigal, Mari Pihlatie, Kuno Kasak, Ülo Niinemets, Heikki Junninen, Kaido Soosaar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Riparian forests are known as hot spots of nitrogen cycling in landscapes. Climate warming speeds up the cycle. Here we present results from a multi-annual high temporal-frequency study of soil, stem, and ecosystem (eddy covariance) fluxes of N2O from a typical riparian forest in Europe. Hot moments (extreme events of N2O emission) lasted a quarter of the study period but contributed more than half of soil fluxes. We demonstrate that high soil emissions of N2O do not escape the ecosystem but are processed in the canopy. Rapid water content change across intermediate soil moisture was a major determinant of elevated soil emissions in spring. The freeze-thaw period is another hot moment. However, according to the eddy covariance measurements, the riparian forest is a modest source of N2O. We propose photochemical reactions and dissolution in canopy-space water as reduction mechanisms.

Original languageEnglish
Article number39
Journalnpj Climate and Atmospheric Science
Issue number1
Early online date14 Jul 2021
Publication statusPublished - Dec 2021


  • biogeochemistry
  • climate change
  • forest ecology


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