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The effects of current water management practices on methane emissions in Japanese rice cultivation


  • Ai Leon

    (National Institute for Agro-Environmental Sciences)

  • Kazunori Kohyama

    (National Institute for Agro-Environmental Sciences)

  • Kazuyuki Yagi

    (National Institute for Agro-Environmental Sciences)

  • Yusuke Takata

    (National Institute for Agro-Environmental Sciences)

  • Hiroshi Obara

    () (National Institute for Agro-Environmental Sciences)


Abstract Cultivated wetland rice fields are a source of methane (CH4) emissions. To estimate CH4 emissions and develop policies to reduce such emissions, information on water management at the farm level is crucial. It is known that farmers implement midseason drainage (MD) to increase rice yields and save water. However, little is known about whether MD is carried out in soils where CH4 emissions are high and how part-time status will influence management. The objective of this study is to identify factors that determine MD implementation using a binomial logistic regression model based on a farm-level survey in Japan and to indicate possible changes in estimates of CH4 emissions, accounting for current water management practices. The implementation rates were significantly higher where the soil types were classified as having the potential for high CH4 emissions. Under current water management practices, the duration of MD and the percentage of continuous flooding were 5 to 7 days longer and approximately 7 % higher, respectively, than the values used by the Greenhouse Gas Inventory Office of Japan, which in turn are used to report greenhouse gas emissions to the United Nations Framework Convention on Climate Change. By accounting for current water conditions with the Tier 2 method, this study indicates that national estimates of CH4 emissions from rice straw application areas could be lowered by 12.7 %. These results may contribute to the development of a mitigation policy that will help to further reduce CH4 emissions.

Suggested Citation

  • Ai Leon & Kazunori Kohyama & Kazuyuki Yagi & Yusuke Takata & Hiroshi Obara, 2017. "The effects of current water management practices on methane emissions in Japanese rice cultivation," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 22(1), pages 85-98, January.
  • Handle: RePEc:spr:masfgc:v:22:y:2017:i:1:d:10.1007_s11027-015-9665-9
    DOI: 10.1007/s11027-015-9665-9

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    References listed on IDEAS

    1. Keijiro Otsuka & Takashi Yamano, 2006. "Introduction to the special issue on the role of nonfarm income in poverty reduction: evidence from Asia and East Africa," Agricultural Economics, International Association of Agricultural Economists, vol. 35(s3), pages 393-397, November.
    2. repec:eee:ecomod:v:205:y:2007:i:3:p:475-491 is not listed on IDEAS
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