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Methane and nitrous oxide emissions from organic and conventional rice cropping systems in Southeast China

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Abstract

To evaluate the impacts of organic cropping system on global warming potentials (GWPs), field measurements of CH4 and N2O were taken in conventional and organic rice (Oryza sativa L.) cropping systems in southeast China. Rice paddies were under various water regimes, including continuous flooding (F), flooding–midseason drainage–reflooding (F-D-F), and flooding–midseason drainage–reflooding and moisture but without waterlogging (F-D-F-M). Nitrogen was applied at the rate of 100 kg N ha−1, as urea-N or pelletized, dehydrated manure product in conventional or organic rice paddies, respectively. Seasonal fluxes of CH4 averaged 4.44, 2.14, and 1.75 mg m−2 h−1 for the organic paddy plots under the water regimes of F, F-D-F and F-D-F-M, respectively. Relative to conventional rice paddies, organic cropping systems increased seasonal CH4 emissions by 20%, 23%, and 35% for the plots under the water regimes of F, F-D-F, and F-D-F-M, respectively. Under the water regimes of F-D-F and F-D-F-M, seasonal N2O-N emissions averaged 10.85 and 13.66 μg m−2 h−1 in organic rice paddies, respectively, which were significantly lower than those in conventional rice paddies. The net global warming potentials (GWPs) of CH4 and N2O emissions from organic rice paddies relative to conventional rice paddies were significantly higher or comparable under various water regimes. The greenhouse gas intensities were greater, while carbon efficiency ratios were lower in organic relative to conventional rice paddies. The results of this study suggest that organic cropping system might not be an effective option for mitigating the combined climatic impacts from CH4 and N2O in paddy rice production.

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Acknowledgments

This work was supported by the Special Fund for Basic Scientific Research of Central Colleges, NAU (Y201018), the NSFC (40971140), the FANEDD (200969), and the NCET (08-0798).

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Authors and Affiliations

  1. College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, Peoples Republic of China

    Yanmei Qin, Shuwei Liu, Yanqin Guo, Qiaohui Liu & Jianwen Zou

  2. College of Environmental Science and Technology, Nanjing University of Information Science and Technology, 210044, Nanjing, Peoples Republic of China

    Qiaohui Liu

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  1. Yanmei Qin
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  2. Shuwei Liu
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Correspondence to Jianwen Zou.

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Qin, Y., Liu, S., Guo, Y. et al. Methane and nitrous oxide emissions from organic and conventional rice cropping systems in Southeast China. Biol Fertil Soils 46, 825–834 (2010). https://doi.org/10.1007/s00374-010-0493-5

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