Scheme of Paddy Field Ecosystem


 Paddy field ecosystem is composed of surface water, plowed soil layer and subsoil, and the plowed soil layer is divided into two layers; thin oxidized soil layer and reduced soil layer. These soil layers are connected by percolating water. In addition, rice roots are developed and plant residues such as rice straw and stubble after rice harvest are incorporated into the plowed soil layer. These microsites are different habitats for microorganisms, and unique microbial communities inhabit depending on the microsites.

 Microbial communities in paddy field ecosystem, which are composed of virus, bacteria, archaea, fungi and protist, have impacts each other. For example, supply of methanogenic substrates by symbiotic anaerobic bacteria are required to produce methane gas, one of the greenhouse gases, by methanogenic archaea. Methane is oxidized by methanotrophs in oxidized aerobic soil. Dynamics of methanogenic archaeal and methanotorph communities are controlled by virus and protists.

 Dynamics of soil microorganisms and their interactions in a paddy field ecosystem are the current central themes of this research group. The aim is to elucidate the facts and mechanisms of microbial diversity and functions in cycling of bioelements in a paddy field ecosystem.


Current researches

  1. 箇条書き項目Microorganisms involving methane cycling in paddy field

  2. 箇条書き項目Microbial ecology during decomposition of organic matter in paddy soil

  3. 箇条書き項目Ecology of protists in paddy field

  4. 箇条書き項目Virus ecology in paddy field

Research keywords

  1. 箇条書き項目Isolation and characterization of novel soil microorganisms

  2. 箇条書き項目Molecular analysis of microbial community

  3. 箇条書き項目Biogeochemical cycles

  4. 箇条書き項目Gene expression and physiology of soil microorganisms

Findings (only in Japanese)

  1. 箇条書き項目Phylogeny of microorganisms inhabiting paddy field ecosystem

  2. 箇条書き項目Function of paddy soil and community structure of microoganisms

  3. 箇条書き項目Supply of organic matters and their impacts on soil microorganisms

  4. 箇条書き項目Origin of methane emitted from paddy field and dynamics of methane in paddy soil

Other (only in Japanese)

  1. 箇条書き項目Open lab. in 2012 (9-10 June 2012)

  2. 箇条書き項目Open lab. in 2006 (3-4 June 2006)