Biology and Fertility of Soils

, Volume 46, Issue 8, pp 825–834 | Cite as

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

  • Yanmei Qin
  • Shuwei Liu
  • Yanqin Guo
  • Qiaohui Liu
  • Jianwen Zou
Original Paper

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.

Keywords

CH4 Global warming potential (GWP) Mitigation for greenhouse gases N2Organic agriculture Rice paddy 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Yanmei Qin
    • 1
  • Shuwei Liu
    • 1
  • Yanqin Guo
    • 1
  • Qiaohui Liu
    • 1
    • 2
  • Jianwen Zou
    • 1
  1. 1.College of Resources & Environmental SciencesNanjing Agricultural UniversityNanjingPeoples Republic of China
  2. 2.College of Environmental Science and TechnologyNanjing University of Information Science and TechnologyNanjingPeoples Republic of China

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