Microaerobic iron oxidation and carbon assimilation and associated microbial community in paddy soil

被引：8

作者：

Chen Y. ^{[1
,2
,3
]}

Li X. ^{[1
]}

Liu T. ^{[1
]}

Li F. ^{[1
]}

机构：

[1] Guangzhou Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, 808, Tianyuan Road, Tianhe District, Guangzhou

[2] Institute for Disaster Management and Reconstruction, Sichuan University–Hong Kong Polytechnic University, Chengdu

[3] College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu

来源：

Acta Geochimica | 2017年 / 36卷 / 03期

基金：

中国国家自然科学基金;

关键词：

CO[!sub]2[!/sub] assimilation; Microaerobic Fe(II)-oxidation; Paddy soil; SIP;

D O I：

10.1007/s11631-017-0219-6

中图分类号：

学科分类号：

摘要：

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. © 2017, Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany.

引用

页码：502 / 505

页数：3

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