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题名: Electron Shuttles Enhance Anaerobic Ammonium Oxidation Coupled to Iron(III) Reduction
作者: Zhou, Guo-Wei; Yang, Xiao-Ru; Li, Hu; Marshall, Christopher W.; Zheng, Bang-Xiao; Yan, Yu; Su, Jian-Qiang; Zhu, Yong-Guan
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期: 2016-09-06
卷号: 50, 期号:17, 页码:9298-9307
DOI: 10.1021/acs.est.6b02077
部门归属: 土壤环境科学实验室
英文摘要: Anaerobic ammonium oxidation coupled to iron(III) reduction, termed Feammox, is a newly discovered nitrogen cycling process. However, little is known about the roles of electron shuttles in the Feammox reactions. In this study, two forms of Fe(III) (oxyhydr)oxide ferrihydrite (ex situ ferrihydrite and in situ ferrihydrite) were used in dissimilatory Fe(III) reduction (DIR) enrichments from paddy soil. Evidence for Feammox in DIR enrichments was demonstrated using the N-15-isotope tracing technique. The extent and rate of both the N-30(2)-N-29(2) and Fe(II) formation were enhanced when amended with electron shuttles (either 9,10-anthraquinone-2,6-disulfonate (AQDS) or biochar) and further simulated when these two shuttling compounds were combined. Although the Feammox-associated Fe(III) reduction accounted for only a minor proportion of total Fe(II) formation compared to DIR, it was estimated that the potentially Feammox-mediated N loss (0.13-0.48 mg N L-1 day(-1)) was increased by 17-340% in the enrichments by the addition of electron shuttles. The addition of electron shuttles led to an increase in the abundance of unclassified Pelobacteraceae, Desulfovibrio, and denitrifiers but a decrease in Geobacter. Overall, we demonstrated a stimulatory effect of electron shuttles on Feammox that led to higher N loss, suggesting that electron shuttles might play a crucial role in Feammox-mediated N loss from soils.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36251
Appears in Collections:土壤环境科学实验室_期刊论文

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