The importance of climate change and nitrogen use efficiency for future nitrous oxide emissions from agriculture

David R. Kanter, Xin Zhang, Denise L. Mauzerall, Sergey Malyshev, Elena Shevliakova

    Research output: Contribution to journalArticlepeer-review


    Nitrous oxide (N2O) is an important greenhouse gas and ozone depleting substance. Previous projections of agricultural N2O (the dominant anthropogenic source) show emissions changing in tandem, or at a faster rate than changes in nitrogen (N) consumption. However, recent studies suggest that the carbon dioxide (CO2) fertilization effect may increase plant N uptake, which could decrease soil N losses and dampen increases in N2O. To evaluate this hypothesis at a global scale, we use a process-based land model with a coupled carbon-nitrogen cycle to examine how changes in climatic factors, land-use, and N application rates could affect agricultural N2O emissions by 2050. Assuming little improvement in N use efficiency (NUE), the model projects a 24%-31% increase in global agricultural N2O emissions by 2040-2050 depending on the climate scenario - a relatively moderate increase compared to the projected increases in N inputs (42%-44%) and previously published emissions projections (38%-75%). This occurs largely because the CO2 fertilization effect enhances plant N uptake in several regions, which subsequently dampens N2O emissions. And yet, improvements in NUE could still deliver important environmental benefits by 2050: equivalent to 10 Pg CO2 equivalent and 0.6 Tg ozone depletion potential.

    Original languageEnglish (US)
    Article number094003
    JournalEnvironmental Research Letters
    Issue number9
    StatePublished - Aug 30 2016


    • CO2
    • agriculture
    • fertilization
    • nitrogen use efficiency
    • nitrous oxide

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • General Environmental Science
    • Public Health, Environmental and Occupational Health


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