文献类型： 外文期刊
作者： 张云;;杨玥玮;;于鑫;;杨思德;;孙嘉璐;;孙涛;;张晓林;;叶会科;;孙约兵;;李晓晶
作者机构：
关键词： Biocurrent;Functional genes;Mercury;Methylmercury;Microbial community;Paddy soil
期刊名称： Journal of Cleaner Production
ISSN： 0959-6526
年卷期： 2025 年 489 卷
页码：
收录情况： SCIE（2025版） ; ; EI（2025版）
摘要： Mercury (Hg) pollution in farmland threatens the soil health and agricultural product safety. Bioremediation is an environmentally friendly approach, and yet the effects of soil microbial electron transfer on Hg conversion remain unclear. Thus, a 135-day soil microbial electrochemical system (MES) was established to investigate how Hg forms are regulated by directionally accelerated electron transport. The results revealed that the flux of soil electron transfer was determined by the transformation of Fe(III)/Fe(II). The bioavailable Hg and methylmercury (MeHg) contents were reduced by 16–29% and 37−45%, respectively, in the soil MES on Days 45 and 90 compared with those in the control, whereas the total Hg content decreased by 4.6–7.6% compared with that in the original soil (OS) on Day 135 (p < 0.05). Biocurrent regulates Hg transformation by stimulating microorganisms carrying Hg transformation genes. Compared with those in OS, the abundances of Geobacter and Clostridium, which are responsible for bioelectricity generation and MeHg conversion, in the anode increased by 42-fold and 99%, respectively. Interestingly, the upregulation of the merA/B gene increased MeHg demethylation, although the number of hgcAB gene copies also increased. The results of the plant experiments revealed that the treated soils had no adverse effects on rape growth and Hg accumulation. We proposed a biogeochemical model for the regulation of Hg transformation by biocurrent driven by the iron reduction process in paddy soil, which provides a supporting for predicting and controlling the production of MeHg in paddy soil. This study highlights the impact of biocurrent on Hg transformation in soil and offering a new approach for the safe management of Hg-contaminated soil.
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