Pedosphere 31(2): 231--242, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Yield-scaled nitrous oxide emissions from nitrogen-fertilized croplands in China: A meta-analysis of contrasting mitigation scenarios
Garba ALIYU1,2, Jiafa LUO3, Hong J. DI4, Deyan LIU1, Junji YUAN1, Zengming CHEN1, Tiehu HE1,2, Weixin DING1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
2University of Chinese Academy of Sciences, Beijing 100049(China)
3AgResearch Limited, Ruakura Research Centre, Hamilton 3240(New Zealand)
4Faculty of Agriculture and Life Sciences, Lincoln University, Lincoln 7646(New Zealand)
ABSTRACT
      Nitrogen (N) losses in cropland resulting from the application of synthetic fertilizers decrease crop productivity and exacerbate environmental pollution. Mitigation measures, such as reduction in N fertilizer application rates, can have unintentional adverse effects on crop yield. We conducted a meta-analysis of soil N2O emissions from agricultural fields across China under contrasting mitigation scenarios as a novel approach to identify the most effective strategy for the mitigation of emissions of N2O derived from N fertilizer use in China. Current standard agricultural practice was used as a baseline scenario (BS), and 12 potential mitigation scenarios (S1-S12) were derived from the available literature and comprised single and combinations of management scenarios that accounted for crop yield. Mitigation scenarios S6 (nitrification inhibitor 3,4-dimethylpyrazole phosphate) and S11 (20% reduction in N application rate plus nitrification inhibitor dicyandiamide) in maize, rice, and wheat crops led to an average 56.0% reduction in N2O emissions at the national level, whereas scenario S4 (nitrification inhibitor dicyandiamide) led to yield optimization, with a 14.0% increase for maize and 8.0% increase for rice as compared to the BS. Implementation of these most effective mitigation scenarios (S4, S6, and S11) might help China, as a signatory to the 2015 United Nations Framework Convention on Climate Change (Paris Agreement), to achieve a 30% reduction in N2O emissions by 2030.
Key Words:  crop yield,emission factor,nitrification inhibitor,nitrogen partial factor productivity,N2O emission,yield-scaled emission
Citation: Aliyu G, Luo J F, Di H J, Liu D Y, Yuan J J, Chen Z M, He T H, Ding W X. 2021. Yield-scaled nitrous oxide emissions from nitrogen-fertilized croplands in China:A meta-analysis of contrasting mitigation scenarios. Pedosphere. 31(2):231-242.
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