Abstract
Nitrous oxide (N2O) fluxes from an apple orchard soil in the semiarid Loess Plateau of China were measured using static chambers from September 2007 to September 2008. In this study, three sites were selected at distance of 2.5 m (D 2.5), 1.5 m (D 1.5), and 0.5 m (D 0.5) from the apple tree row. Nitrous oxide fluxes followed seasonal pattern, with high N2O emission rates occurring in the hot-humid summer and low rates in the cold-dry winter. Pulses of N2O emissions occurred after nitrogen fertilizer application, summer rainfall events, and during freeze-thaw cycles. Annual average N2O emission rates were the highest at D 0.5 site (48.2 ± 39.9 µg N2O m−2 h−1), the lowest at D 2.5 site (31.9 ± 18.2 µg N2O m−2 h−1), and intermediate at D1.5 site (36.8 ± 32.2 µg N2O m−2 h−1), suggesting that N2O emissions from the apple orchard soil increased when the chamber location was closer to the apple tree row. This may be due to the fertilization close to roots in hot and humid season. Over one third (37.1%) of the annual N2O emission occurred in the summer. Annual N2O emissions from the apple orchard soil averaged to 3.22 kg N2O ha−1 year−1. Annual emission factor of the apple orchard from the applied fertilizer (uncorrected for background emission) was 0.658%. This value was nearly a half (53%) of the default value provided by the Intergovernmental Panel on Climate Change for the application of synthetic fertilizers to cropland (1.25%). Therefore, the amount of N2O emissions from the semiarid apple orchard soil could be largely overestimated if no regional-specific factor is used.
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Acknowledgment
This study was supported by the National Science Foundation of China (40321101) and Ministry of Science and Technology (2002CB412503). The authors would like to thank Meiling Chen and Yucheng Li for their technical assistance in the field. We are very grateful to the editor and two anonymous reviewers for giving helpful comments and revision suggestions.
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Pang, J., Wang, X., Mu, Y. et al. Nitrous oxide emissions from an apple orchard soil in the semiarid Loess Plateau of China. Biol Fertil Soils 46, 37–44 (2009). https://doi.org/10.1007/s00374-009-0403-x
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DOI: https://doi.org/10.1007/s00374-009-0403-x