Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74556
Title: Microaerobic iron oxidation and carbon assimilation and associated microbial community in paddy soil
Authors: Chen, Y 
Li, X
Liu, T
Li, F
Keywords: CO2 assimilation
Microaerobic Fe(II)-oxidation
Paddy soil
SIP
Issue Date: 2017
Publisher: Elsevier
Source: Acta geochimica, 2017, v. 36, no. 3, p. 502-505 How to cite?
Journal: Acta geochimica 
Abstract: 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 and 16S rRNA gene-based sequencing. The results showed that CO2 assimilation and Fe(II) oxidation in the gradient tubes were predominantly mediated by the microbes enriched in the paddy soil, primarily Azospirillum and Magnetospirillum, as their relative abundances were higher in the 13C heavy fractions compared to 12C heavy fractions. This study provided direct evidence of chemoautotrophic microaerophiles linking iron oxidation and carbon assimilation at the oxic–anoxic interface in the paddy soil ecosystem.
URI: http://hdl.handle.net/10397/74556
ISSN: 2096-0956
DOI: 10.1007/s11631-017-0219-6
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