Forest canopy mitigates soil N2O emission during hot moments

0544262 - ÚVGZ 2022 RIV DE eng J - Journal Article
Mander, Ülo - Krasnova, A. - Escuer-Gatius, J. - Espenberg, M. - Schindler, Thomas - Macháčová, Kateřina - Pärn, J. - Maddison, M. - Megonigal, J. P. - Pihlatie, M. - Kasak, K. - Niinemets, Ü. - Junninen, H. - Soosaar, Kaido
Forest canopy mitigates soil N2O emission during hot moments.
n p j Climate and Atmospheric Science. Roč. 4, č. 1 (2021), č. článku 39. ISSN 2397-3722. E-ISSN 2397-3722
R&D Projects: GA ČR(CZ) GJ17-18112Y; GA MŠMT(CZ) EF16_019/0000797
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : nitrous-oxide emissions * greenhouse-gas emissions * eddy-covariance * flux measurements * temperate forest * carbon-dioxide * water * exchange * methane * no
OECD category: Plant sciences, botany
Impact factor: 9.448, year: 2021
Method of publishing: Open access
https://www.nature.com/articles/s41612-021-00194-7

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.
Permanent Link: http://hdl.handle.net/11104/0321289