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npj Climate and Atmospheric Science
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Forest canopy mitigates soil N2O emission during hot moments

Authors: Ülo Mander; Alisa Krasnova; Jordi Escuer-Gatius; Mikk Espenberg; Thomas Schindler; Katerina Machacova; Jaan Pärn; +7 Authors

Forest canopy mitigates soil N2O emission during hot moments

Abstract

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.

Peer reviewed

Country
Finland
Related Organizations
Subjects by Vocabulary

Microsoft Academic Graph classification: Canopy Eddy covariance Atmospheric sciences Riparian forest Ecosystem Nitrogen cycle Water content Tree canopy geography geography.geographical_feature_category Temperate forest Environmental science

Keywords

1171 Geosciences, Atmospheric Science, NITROUS-OXIDE EMISSIONS, FLUX MEASUREMENTS, NO, CARBON-DIOXIDE, METHANE, Meteorology. Climatology, WATER, Environmental Chemistry, GE1-350, EXCHANGE, 4112 Forestry, Global and Planetary Change, GREENHOUSE-GAS EMISSIONS, EDDY-COVARIANCE, Environmental sciences, TEMPERATE FOREST, QC851-999

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    5
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Top 10%
Average
Average
gold