Addressing agricultural nitrogen losses in a changing climate

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Abstract

Losses of nitrogen from agriculture are a major threat to environmental and human health at local, regional and global scales. Emerging evidence shows that climate change and intensive agricultural management will interact to increase the harmful effects and undermine current mitigation efforts. Identifying effective mitigation strategies and supporting policies requires an integrated understanding of the processes underlying potential agricultural nitrogen responses to climate change. In this Review, we describe these processes, propose a set of multi-scale principles to guide research and policy for decreasing nitrogen losses in the future, and describe the economic factors that could constrain or enable their implementation.

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Fig. 1: Controls of water fluxes and soil moisture on plant–soil N processes.
Fig. 2: Total aboveground N uptake in maize at harvest increases with total growing season precipitation (May–September).
Fig. 3: Conceptual diagram of the response of plant–soil–microorganism N cycling to changes in soil moisture dynamics resulting from fewer but more intense rain events expected in the future.
Fig. 4: Conceptual diagram showing the relationship between adverse weather and interconnected effects on crop biomass production, yields and NUE in more or less resilient agroecosystems, and management strategies that increase drivers of resilience.

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Acknowledgements

We acknowledge funding to T.M.B. from a US Department of Agriculture Agriculture and Food Research Initiative Education and Literacy Initiative (AFRI ELI) postdoctoral fellowship (2017-67012-26094), to A.S.G. from US Department of Agriculture National Institute of Food and Agriculture Agriculture Experiment Station (NIFA AES) project CA-D-PLS-2332-H, and to W.R.W. from US Department of Agriculture (NIFA 2015-67003-23485) and US Environmental Protection Agency. We thank C. Stewart and V. Jin for providing data and assistance with DAYCENT modelling. We acknowledge the Kellogg Biological Station Long-term Ecological Research Program and GRACEnet for data used to make Fig. 2a and Fig. 2b,c, respectively.

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T.M.B. and A.S.G. conceived the framework and led the writing of the manuscript. T.M.B. analysed the data and made all figures. E.E.C. and W.R.W. conducted the modelling. All authors contributed to the writing of the manuscript.

Correspondence to Timothy M. Bowles.

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Supplementary Sections A–C, Supplementary Figure 1, Supplementary References 1–6

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Bowles, T.M., Atallah, S.S., Campbell, E.E. et al. Addressing agricultural nitrogen losses in a changing climate. Nat Sustain 1, 399–408 (2018) doi:10.1038/s41893-018-0106-0

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