Abstract
The responses of δ15N–N2O isotopic signatures to nitrogen (N) fertilization in in situ soils are not yet clear in agricultural field settings. We therefore conducted a 1-year field experiment to assess how N fertilization (0 and 400 kg N ha−1 year−1, N0 and N400) affects the δ15N–N2O isotopic signatures both at soil surface and in soil profile (0–3 m) in a wheat–maize rotation in North China. N fertilization increased N2O concentrations by 18–79% in the soil profile. It increased N2O fluxes by 9 times and 1–7 times at the soil surface and 0–0.9 m soil depth, respectively. In comparison, N fertilization reduced δ15N–N2O values by 10–74% in the soil profile. It reduced δ15N–N2O isotopic signatures at the soil surface and in the soil profile by 18% and 33%, respectively. The δ15N–N2O isotopic signature was dominated by substrate δ15N signature and N isotope fractionation during cold and warm seasons, respectively. Our results indicate that denitrification steps of NO3− → N2O dominated N2O production (over 99%) in the N0 treatment and the N400 treatment during N-fertilizer-free period. Following N fertilization, the NO3− → N2O dominated N2O production (over 99%) in the soil profile, N2O flux from the soil surface was mostly derived from NO3− → N2O and less from NH4+ → N2O. Overall, denitrification was found to dominate soil N2O transformation metabolism in the wheat–maize rotation cropland in North China.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Grant No. 41875180, Grant No. 41530859), and the National Key Research and Development Program of China (2016YFD0200307). We sincerely thank Jinlian Li, Junqi Yang, Shuqin Wen and Xinzhi Kang for their hard work and enthusiasm in the field.
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Wang, Y., Dong, W., Zhang, Y. et al. δ15N–N2O signatures in response to N fertilization in a wheat–maize rotation. Nutr Cycl Agroecosyst 119, 369–387 (2021). https://doi.org/10.1007/s10705-021-10123-y
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DOI: https://doi.org/10.1007/s10705-021-10123-y