Warming and redistribution of nitrogen inputs drive an increase in terrestrial nitrous oxide emission factor

作者：Eliza Harris, Longfei Yu, Ying‐Ping Wang, Joachim Mohn, Stephan Henne, Edith Bai, Matti Barthel, Marijn Bauters, Pascal Boeckx, Christopher D. Dorich, Mark Farrell, Paul B. Krummel, Zoe M. Loh, Markus Reichstein, Johan Six, Martin Steinbacher, Naomi S. Wells, Michael Bahn, Peter Julian Rayner · 发表于：Nature Communications · 年份：2022 · DOI：10.1038/s41467-022-32001-z · 被引用次数：110 · 研究领域：Atmospheric and Environmental Gas Dynamics、Atmospheric chemistry and aerosols、Soil Carbon and Nitrogen Dynamics

Abstract Anthropogenic nitrogen inputs cause major negative environmental impacts, including emissions of the important greenhouse gas N 2 O. Despite their importance, shifts in terrestrial N loss pathways driven by global change are highly uncertain. Here we present a coupled soil-atmosphere isotope model (IsoTONE) to quantify terrestrial N losses and N 2 O emission factors from 1850-2020. We find that N inputs from atmospheric deposition caused 51% of anthropogenic N 2 O emissions from soils in 2020. The mean effective global emission factor for N 2 O was 4.3 ± 0.3% in 2020 (weighted by N inputs), much higher than the surface area-weighted mean (1.1 ± 0.1%). Climate change and spatial redistribution of fertilisation N inputs have driven an increase in global emission factor over the past century, which accounts for 18% of the anthropogenic soil flux in 2020. Predicted increases in fertilisation in emerging economies will accelerate N 2 O-driven climate warming in coming decades, unless targeted mitigation measures are introduced.