Abstract
Guaranteeing high crop yields while reducing environmental impacts of nitrogen fertilizer use due to associated losses of N2O emissions and nitrate (NO3 −) leaching is a key challenge in the context of sustainable intensification of crop production. However, few field data sets are available that explore the effect of different forms of N management on yields as well as on N losses in the form of N2O or NO3 −. Here we report on a large-scale field lysimeter (8 × 4 m2) experiment, which was designed to determine soil CH4 and N2O emissions, NO3 − leaching losses and crop yields from a subtropical rain-fed wheat–maize rotation in the Sichuan Basin, one of the most intensively used agricultural regions in China. One control and three different fertilizer treatments with the same total rate of N application (280 kg N ha−1 y−1) were included: NF: control (no fertilizer); NPK: synthetic N fertilizer; OMNPK: synthetic N fertilizer plus pig manure; RSDNPK: synthetic N fertilizer plus crop residues. As compared to the standard NPK treatment, annual NO3 − leaching losses for OMNPK and RSDNPK treatments were decreased by 36 and 22%, respectively (P < 0.05). Similarly, crop yield-scaled NO3 − leaching for NPK treatment was higher than those for either OMNPK or RSDNPK treatments (P < 0.05). Direct N2O emissions for RSDNPK treatment were decreased as compared with NPK and OMNPK treatments (P < 0.05). Furthermore, the yield-scaled GWP (global warming potential) was lower for the treatments where either pig manure or crop residues were incorporated as compared to the standard NPK treatment (P < 0.05). Our study indicates that it is possible to reduce the negative environmental impact of NO3 − leaching and N2O emissions without compromising crop productivity. Yield-scaled NO3 − leaching, similar to the yield-scaled GWP, represents another valuable-integrated metric to address the dual goals of reducing nitrogen pollution and maintaining crop grain yield for a given agricultural system.
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Acknowledgments
This study was gratefully supported by the Natural Science Foundation of China (Grant No. 41271321), National Program on Key Basic Research Projects of China (Grant No. 2012CB417101), Natural Science Foundation of China (Grant No. 40901144) and the Helmholtz-CAS Joint Laboratory ENTRANCE. We sincerely thank Dr. David Pelster of the International Livestock Research Institute (ILRI) for his help with proof-reading the manuscript. Furthermore, we thank Mr. Zebin Zeng, Dr. Tao Wang and the staff at Yanting station for their support in the field measurements. KBB received financial support via the CCAFS program of CGIAR institutes.
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BZ designed the long-term experiment and KBB, BZ and NB conceived the study. MZ, JB and YW performed the research. MZ analyzed the data and MZ and KBB wrote the paper.
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Zhou, M., Zhu, B., Brüggemann, N. et al. N2O and CH4 Emissions, and NO3 − Leaching on a Crop-Yield Basis from a Subtropical Rain-fed Wheat–Maize Rotation in Response to Different Types of Nitrogen Fertilizer. Ecosystems 17, 286–301 (2014). https://doi.org/10.1007/s10021-013-9723-7
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DOI: https://doi.org/10.1007/s10021-013-9723-7