Sustainable in-situ arsenic immobilization in paddy soils using magnetic biochar and the role of microbial functional genes

文献类型： 外文期刊

第一作者： Liang, Meina

作者： Liang, Meina;Li, Jiawei;Zhang, Jingnan;Zhang, Qing;Zhang, Xuehong;Wang, Dunqiu;Li, Jiawei;Zhang, Xuehong;Wang, Dunqiu

作者机构：

关键词： Magnetic biochar; Arsenic remediation; Paddy soil microbial community; arsM / arsC; Rice quality

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2025 年 392 卷

页码：

收录情况： SCI

摘要： Arsenic (As) contamination in paddy soils poses a threat to both rice safety and human health. To address this challenge, we developed and evaluated an in-situ remediation approach using magnetic iron oxide biochar (MBC) for paddy soils with varying As contamination levels, aiming to reduce As accumulation in rice grains. MBC significantly altered soil physicochemical properties [pH, dissolved organic carbon (DOC), soil organic matter (SOM), and Free iron oxides (Fe-ox)] at both tillering and maturity stages. Reduced available As by 31-65 % across low (136.68 mg kg- 1), moderate (214.22 mg kg- 1), and high (254.21 mg kg- 1) contamination levels, and suppressed As translocation to rice grains by 62 %, ensuring brown rice As levels below the Chinese national safety threshold (GB 2762-2022, <= 0.35 mg kg- 1). The paddy soils' metagenomic analysis revealed MBC-enriched Pseudomonadota and Actinomycetota with arsM and arsC genes, transitioning microbial networks from modular (tillering stage) to interconnected (maturity stage), enhancing arsenic detoxification and organic matter degradation. MBC enables efficient As immobilization and redox transformation, offering a scalable, eco-friendly solution for reconciling soil remediation with safe rice production in various As-contaminated regions.

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