Effect of ferrihydrite biomineralization on methanogenesis in an anaerobic incubation from paddy soil
文献类型： 外文期刊
作者： Zhuang, Li 1 ; Xu, Jielong 1 ; Tang, Jia 1 ; Zhou, Shungui 1 ;
作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou, Guangdong, Peoples R China
关键词： ferrihydrite mineralization;methanogenesis;magnetite;direct electric syntrophy;Geobacter
期刊名称：JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES （ 影响因子：3.822； 五年影响因子：4.566 ）
ISSN： 2169-8953
年卷期： 2015 年 120 卷 5 期
页码：
收录情况： SCI
摘要： Microbial reduction of Fe(III) can be one of the major factors controlling methane production from anaerobic sedimentary environments, such as paddy soils and wetlands. Although secondary iron mineralization following Fe(III) reduction is a process that occurs naturally over time, it has not yet been considered in methanogenic systems. This study performed a long-term anaerobic incubation of a paddy soil and ferrihydrite-supplemented soil cultures to investigate methanogenesis during ferrihydrite biomineralization. The results revealed that the long-term effect of ferrihydrite on methanogenesis may be enhancement rather than suppression documented in previous studies. During initial microbial ferrihydrite reduction, methanogenesis was suppressed; however, the secondary minerals of magnetite formation was simultaneous with facilitated methanogenesis in terms of average methane production rate and acetate utilization rate. In the phase of magnetite formation, microbial community analysis revealed a strong stimulation of the bacterial Geobacter, Bacillus, and Sedimentibacter and the archaeal Methanosarcina in the ferrihydrite-supplemented cultures. Direct electric syntrophy between Geobacter and Methanosarcina via conductive magnetite is the plausible mechanism for methanogenesis acceleration along with magnetite formation. Our data suggested that a change in iron mineralogy might affect the conversion of anaerobic organic matter to methane and might provide a fresh perspective on the mitigation of methane emissions from paddy soils by ferric iron fertilization.
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