• Effect of Repetitive Redox Transitions to Soil Bacterial Community and its Potential Impact on the Cycles of Iron and Arsenic 
  • Sujin Park1·Sanghyun Kim1·Hyeonyong Chung1·Sun Woo Chang2·Heesun Moon3·Kyoungphile Nam1*

  • 1Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Korea
    2Korea Institute of Civil Engineering and Building Technology, Gyeonggi-Do 10223, Korea
    3Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea

  • 비소오염토양에서 반복적인 Redox 환경 변화가 토양 미생물 군집과 비소 및 철의 순환에 미치는 영향
  • 박수진1·김상현1·정현용1·장선우2·문희선3·남경필1*

  • 1서울대학교 건설환경공학부


In a redox transition zone, geochemical reactions are facilitated by active bacteria that mediate reactions involving electrons, and arsenic (As) and iron (Fe) cycles are the major electron transfer reactions occurring at such a site. In this study, the effect of repetitive redox changes on soil bacterial community in As-contaminated soil was investigated. The results revealed that bacterial community changed actively in response to redox changes, and bacterial diversity gradually decreased as the cycle repeated. Proportion of strict aerobes and anaerobes decreased, while microaerophilic species such as Azospirillum oryzae group became the predominant species, accounting for 72.7% of the total counts after four weeks of incubation. Bacterial species capable of reducing Fe or As (e.g., Clostridium, Desulfitobacterium) belonging to diverse phylogenetic groups were detected. Indices representing richness (i.e., Chao 1) and phylogenetic diversity decreased from 1,868 and 1,926 to 848 and 1,121, respectively. Principle component analysis suggests that repetitive redox fluctuation, rather than oxic or anoxic status itself, is an important factor in determining the change of soil bacterial community, which in turn affects the cycling of As and Fe in redox transition zones. 

Keywords: Redox transition zone, Bacterial community, Phylogenetic diversity, As contaminated soil

This Article

  • 2020; 25(1): 25-36

    Published on Mar 31, 2020

  • 10.7857/JSGE.2020.25.1.025
  • Received on Dec 23, 2019
  • Revised on Dec 26, 2019
  • Accepted on Feb 24, 2020

Correspondence to

  • Kyoungphile Nam
  • Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Korea

  • E-mail: kpnam@snu.ac.kr