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Summer storms trigger soil N₂O efflux episodes in forested catchments

Show simple item record Enanga, E.M. Creed, I.F. Casson, N.J. Beall, F.D. 2018-09-25T23:08:11Z 2018-09-25T23:08:11Z 2016-01-14
dc.identifier.citation Enanga, E.M., I.F. Creed, N.J. Casson, F.D. Beall. "Summer storms trigger soil N₂O efflux episodes in forested catchments." Journal of Geophysical Research - Biogeosciences, 121(1) (January 2016): 95-108. DOI: 10.1002/2015JG003027. en_US
dc.identifier.issn 2169-8953
dc.description.abstract Climate change and climate-driven feedbacks on catchment hydrology and biogeochemistry have the potential to alter the aquatic versus atmospheric fate of nitrogen (N) in forests. This study investigated the hypothesis that during the forest growth season, topography redistributes water and water-soluble precursors (i.e., dissolved organic carbon and nitrate) for the formation of gaseous N species. Soil nitrous oxide (N₂O) and nitrogen (N₂) efflux and soil physical and chemical properties were measured in a temperate forest in Central Ontario, Canada from 2005 to 2010. Hotspots and hot moments of soil N₂O and N₂ efflux were observed in topographic positions that accumulate precipitation, which likely triggered the formation of redox conditions and in turn intercepted the conversion of nitrate N flowing to the stream by transforming it to N₂O and N₂. There was a strong relationship between precipitation and N₂O efflux (y = 0.44x1.22, r² = 0.618, p<0.001 in the inner wetland; y = 1.30x^{1.16} r² = 0.72, p<0.001 in the outer wetland) and significantly different N₂:N₂O ratios in different areas of the wetland (19.6 in the inner wetland and 10.1 in the outer wetland). Soil N₂O+N₂ efflux in response to precipitation events accounted for 16.1% of the annual N input. A consequence of the higher frequency of extreme precipitation events predicted under climate change scenarios is the shift from an aquatic to atmospheric fate for N, resulting in a significant forest N efflux. This in turn creates feedbacks for even warmer conditions due to increased effluxes of potent greenhouse gases. en_US
dc.description.sponsorship "This research was funded by an NSERC Discovery grant to IFC (217053‐2009 RGPIN)." en_US
dc.description.uri en_US
dc.language.iso en en_US
dc.publisher American Geophysical Union en_US
dc.subject ATMOSPHERIC COMPOSITION AND STRUCTURE: Biosphere/atmosphere interactions, Evolution of the atmosphere en_US
dc.subject BIOGEOSCIENCES: Biogeochemical cycles, processes, and modeling, Biogeochemical kinetics and reaction modeling, Nitrogen cycling en_US
dc.subject CRYOSPHERE: Biogeochemistry en_US
dc.subject GLOBAL CHANGE: Biogeochemical cycles, processes, and modeling, Atmosphere HYDROLOGY: Catchment en_US
dc.subject OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL: Biogeochemical cycles, processes, and modeling en_US
dc.subject PALEOCEANOGRAPHY: Biogeochemical cycles, processes, and modeling en_US
dc.subject GEOGRAPHIC LOCATION: North America en_US
dc.title Summer storms trigger soil N₂O efflux episodes in forested catchments en_US
dc.type Article en_US
dc.identifier.doi 10.1002/2015JG003027 en_US

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