Abundance of methanogens, methanotrophic bacteria, and denitrifiers in rice paddy soils

Juyoung Seo, Inyoung Jang, Gerhard Gebauer, Hojeong Kang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Many studies have examined greenhouse gas fluxes from rice paddies, but information about microorganisms involved in the process is limited. In this study, we used a molecular approach to identify functional genes including mcrA, pmoA, and nirK/nirS/nosZ to quantify the abundance of methanogens, methane-oxidizing bacteria, and denitrifiers, respectively. We also analyzed soil chemical properties such as soil organicmatter, pH, and inorganic nitrogen to detect key variables, which control the abundances of these microbes. Abundances of methanogens, methane-oxidizing bacteria, and denitrifying genes were unchanged during the 1-year study. The abundances of methane-oxidizing bacteria and denitrifiers, except for methanogens, were highest near the soil surface where oxygen availability was likely higher. It is noteworthy that genes for the reduction of CH4 and N2Owere particularly abundant near the soil surface. Additionally, most of gene abundances were correlated with SOM and inorganic nitrogen especially during summer. Overall, the results indicated that microbes responsible for CH4 or N 2O dynamics were not affected by seasons, but were sensitive to oxygen availability and soil chemical properties. We also concluded that GHG emission would be stimulated by increased C availability and microbial activities in rice paddies, which are expected to be enhanced by global climate change.

Original languageEnglish
Pages (from-to)213-223
Number of pages11
JournalWetlands
Volume34
Issue number2
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Methanogens
Bacteria
rice
Methane
Soils
Genes
bacterium
gene
methane
Availability
inorganic nitrogen
soil
Chemical properties
chemical property
soil surface
Nitrogen
Oxygen
oxygen
Greenhouse gases
Climate change

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

Cite this

Seo, Juyoung ; Jang, Inyoung ; Gebauer, Gerhard ; Kang, Hojeong. / Abundance of methanogens, methanotrophic bacteria, and denitrifiers in rice paddy soils. In: Wetlands. 2014 ; Vol. 34, No. 2. pp. 213-223.
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Abundance of methanogens, methanotrophic bacteria, and denitrifiers in rice paddy soils. / Seo, Juyoung; Jang, Inyoung; Gebauer, Gerhard; Kang, Hojeong.

In: Wetlands, Vol. 34, No. 2, 01.01.2014, p. 213-223.

Research output: Contribution to journalArticle

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