Paddy and Water Environment

, Volume 10, Issue 4, pp 281–289 | Cite as

Comparison of methanotrophic bacteria, methane oxidation activity, and methane emission in rice fields fertilized with anaerobically digested slurry between a fodder rice and a normal rice variety

  • K. T. Win
  • R. Nonaka
  • A. T. Win
  • Y. Sasada
  • K. Toyota
  • T. Motobayashi
  • M. Hosomi


Methane oxidation activity (MOA), methanotrophic bacteria (MOB), and CH4 emission in a paddy field fertilized with anaerobically digested slurry were compared between two varieties: a fodder rice variety Leaf star (LS) and a normal rice variety Kinuhikari (KN). Average MOA and MOB per unit dry root were significantly higher in KN (7.1 μmol g−1 CH4 g−1 dry root h−1 and 3.7 × 107 MPN g−1 dry root, respectively) than in LS (4.3 μmol g−1 CH4 g−1 dry root h−1, 2.1 × 107 MPN g−1 dry root), although MOA in the rice root per whole plant was not significantly different since root biomass of LS (1.5 g dry root plant−1) was significantly higher than that of KN (1.2 g dry root plant−1). MOA in the soil ranged from 0.031 to 0.087 μmol g−1 CH4 g−1 dry soil h−1, but there were no significant differences in both depths (0–5 and 5–15 cm) between the two rice varieties. MOA in the rhizosphere soil was significantly different between the rice varieties at flowering, but not at tillering. Methane emission in the field was lower and MOA and MOB in the rice root were higher in LS than in KN at tillering, but the reverse results were found at flowering and maturity stages. Total CH4 emission during a growing period was not significantly different between LS (27.4 ± 16.9 g CH4 m−2) and KN (24.0 ± 19.5 g CH4 m−2). There was a significant negative relationship between CH4 emission and rice root MOB (P < 0.01) or MOA (P < 0.05) and significant positive relationship was observed between root MOA and MOB (P < 0.01). This study revealed that choice of rice variety might be an important environmental issue in paddy cultivation since it can influence MOA and MOB in rice root and rhizosphere soil which relate with CH4 emission.


Kinuhikari Leaf star Methanotrophs Methane oxidation Methane emission Root biomass 



This study was supported by Japan Science and Technology (JST) and National Natural Science Foundation of China (NSFC). The authors thank Dr. Masanori Okazaki, Dean, Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology (TUAT) for permitting of analysis of C and N for soil and Dr. Kimura Sonoko D., Associate Professor, TUAT, for her supporting of Plexiglas chambers.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • K. T. Win
    • 1
  • R. Nonaka
    • 1
  • A. T. Win
    • 1
  • Y. Sasada
    • 1
  • K. Toyota
    • 1
  • T. Motobayashi
    • 2
  • M. Hosomi
    • 3
  1. 1.Graduate School of Bio-Applications and Systems EngineeringTokyo University of Agriculture and TechnologyKoganeiJapan
  2. 2.Faculty of AgricultureTokyo University of Agriculture and TechnologyFuchuJapan
  3. 3.Faculty of EngineeringTokyo University of Agriculture and TechnologyKoganeiJapan

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