Microaerobic iron oxidation and carbon assimilation and associated microbial community in paddy soil
Iron oxidation is a prevalent and important biogeochemical process in paddy soil,but little is known about whether and how microbially mediated iron oxidation is coupled with carbon assimilation particularly under microaerobic conditions.Here,we investigated kinetics of CO2 assimilation and Fe(Ⅱ)oxidation in an incubation experiment with paddy soil under suboxic conditions,and profiled the associated microbial community using DNA-stable isotope probing(SIP)and 16S rRNA gene-based sequencing.The results revealed that,the CO2 assimilation and Fe(Ⅱ)oxidation in the gradient tubes were predominantly mediated by the microbes enriched from the paddy soil,which mainly included Azospirillum and Magnetospirillum as their relative abundances were higher in the 13C heavy fractions compared to 12C heavy fractions.This study provided direct evidences of chemoautotrophic microaerophiles linking iron oxidation and carbon assimilation at the oxic-anoxic interface in the paddy soil ecosystem.
paddy soil microaerobic Fe(Ⅱ)-oxidation CO2 assimilation SIP
Yating Chen Xiaomin Li Tongxu Liu Fangbai Li
Guangzhou Key Laboratory of Agricultural Environment Pollution Integrated Control,Guangdong Institut Guangzhou Key Laboratory of Agricultural Environment Pollution Integrated Control,Guangdong Institut
国际会议
The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)
贵阳
英文
1-4
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）