Journal
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
Volume 4, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41612-021-00194-7
Keywords
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Categories
Funding
- Ministry of Education and Science of Estonia [SF0180127s08]
- Estonian Research Council [IUT2-16, PRG-352, MOBERC20]
- Czech Science Foundation [17-18112Y]
- project SustES-Adaptation strategies for sustainable ecosystem services and food security under adverse environmental conditions [CZ.02.1.01/0.0/0.0/16_019/0000797]
- EU through the European Regional Development Fund (Centre of Excellence ENVIRON) [TK-107]
- EU through the European Regional Development Fund (Centre of Excellence EcolChange) [TK-131]
- EU through the European Regional Development Fund (Centre of Excellence MOBTP101 returning researcher grant by the Mobilitas Pluss program)
- European Social Fund (Doctoral School of Earth Sciences and Ecology)
- Academy of Finland [294088, 288494]
- European Research Council (ERC) under the European Union [757695]
- European Research Council (ERC) [757695] Funding Source: European Research Council (ERC)
- Academy of Finland (AKA) [288494, 294088, 288494, 294088] Funding Source: Academy of Finland (AKA)
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Riparian forests are considered hotspots of nitrogen cycling, with climate warming accelerating the process. High soil emissions of N2O in riparian forests are mainly processed in the canopy, with rapid water content changes and freeze-thaw periods being major factors contributing to elevated soil emissions. Eddy covariance measurements suggest that riparian forests are a moderate source of N2O, with photochemical reactions and dissolution in canopy-space water proposed as reduction mechanisms.
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.
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