Low-molecular-weight organic acids inhibit the methane-dependent arsenate reduction process in paddy soils

文献类型： 外文期刊

第一作者： Zhang, Yu

作者： Zhang, Yu;Tong, Di;Ji, Haofeng;Zhou, Xinyao;Tang, Xianjin;Zou, Lina;Gustave, Williamson

作者机构：

关键词： Methane oxidation; Arsenic reduction; Microorganisms; Anaerobic; Organic acids

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.2； 五年影响因子：6.3 ）

ISSN： 0147-6513

年卷期： 2024 年 282 卷

页码：

收录情况： SCI

摘要： Anaerobic methane oxidation (AOM) can drive soil arsenate reduction, a process known as methane-dependent arsenate reduction (M-AsR), which is a critical driver of arsenic (As) release in soil. Low molecular weight organic acids (LMWOAs), an important component of rice root exudates, have an unclear influence and mechanism on the M-AsR process. To narrow this knowledge gap, three typical LMWOAs - citric acid, oxalic acid, and acetic acid - were selected and added to As-contaminated paddy soils, followed by the injection of 13 CH 4 and incubation under anaerobic conditions. The results showed that LMWOAs inhibited the M-AsR process and reduced the As(III) concentration in soil porewater by 35.1 - 65.7 % after 14 days of incubation. Among the LMWOAs, acetic acid exhibited the strongest inhibition, followed by oxalic and citric acid. Moreover, LMWOAs significantly altered the concentrations of ferrous iron and dissolved organic carbon in the soil porewater, consequently impacting the release of As in the soil. The results of qPCR and sequencing analysis indicated that LMWOAs inhibited the M-AsR process by simultaneously suppressing microbes associated with ANNIE-2d and arrA . Our findings provide a theoretical basis for modulating the M-AsR process and enhance our understanding of the biogeochemical cycling of As in paddy soils under rhizosphere conditions.

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