Atmospheric impact of nitrous oxide uptake by boreal forest soils can be comparable to that of methane uptake
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Atmospheric impact of nitrous oxide uptake by boreal forest soils can be comparable to that of methane uptake Henri M.P. Siljanen & Nina Welti & Carolina Voigt & Juha Heiskanen & Christina Biasi & Pertti J. Martikainen
Received: 29 July 2019 / Accepted: 6 July 2020 # The Author(s) 2020
Abstract Aims Environmental factors controlling nitrous oxide (N2O) uptake in forest soils are poorly known, and the atmospheric impact of the forest N2O sink is not well constrained compared to that of methane (CH4). Methods We compared nitrous oxide (N2O) and CH4 fluxes over two growing seasons in boreal forest soils located in Eastern Finland. Within a spruce forest, we compared plots with long-term nitrogen (N) fertilization history and non-fertilized plots, and additionally pine Responsible Editor: Elizabeth M Baggs. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04638-6) contains supplementary material, which is available to authorized users. H. M. Siljanen : N. Welti (*) : C. Voigt : C. Biasi : P. J. Martikainen Department of Environmental and Biological sciences, University of Eastern Finland, Yliopistonranta 1, 70210 Kuopio, Finland e-mail: [email protected] J. Heiskanen Natural Resources Institute Finland, Neulaniementie 5, FI-70210 Kuopio, Finland
forest plots without a fertilization history. The flux data was complemented with measurements of climatic conditions and soil physical and chemical characteristics, in order to identify factors affecting N2O and CH4 fluxes. Results Non-fertilized spruce forest soils showed the highest cumulative N2O uptake among the sites, whereas the pine forest site displayed low cumulative N2O emission. Nitrous oxide uptake was favored by high soil silt and water content. The low temperature seasons, spring and autumn, had the highest N2O uptake, likely associated with high soil water content typical for these seasons. In the spruce forest the N2O uptake was seasonally decoupled from the CH4 uptake. Conclusions Applying the Global Warming Potential (GWP) approach, the cooling effect of N2O uptake in the spruce forest was on average 35% of that of CH4 uptake showing that N2O uptake should be considered when evaluating the atmospheric impact of boreal forests. Keywords Nitrous oxide . Methane . Atmospheric uptake . Greenhouse gas . Denitrification
Introduction Present Address: N. Welti Commonwealth Scientific and Industrial Research Organization, Agriculture and Food, Glen Osmond, Australia Present Address: C. Voigt Department of Geography, University of Montreal, 1375 Avenue Thérèse-Lavoie-Roux, Montreal, QC H2V 0B3, Canada
The concentration of nitrous oxide (N2O) in the atmosphere has increased from 270 ppb in preindustrial times to 328 ppb today (Blasing 2017). This increase is mainly due to agricultural N2O emissions, but also resulting from wastewater treatment and fossil fuel burning (Machida et al. 1995; Flückiger et al. 1999; MacFarling Meure et al. 2006; Thomson et al. 2012;
Plant Soil
Blasing 2017). N
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