Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Science, Northwest University, Xi'an 710127, China.
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Science, Northwest University, Xi'an 710127, China.
Sci Total Environ. 2024 Nov 15;951:175500. doi: 10.1016/j.scitotenv.2024.175500. Epub 2024 Aug 14.
Arsenic pollution in paddy fields has become a public concern by seriously threatening rice growth, food security and human health. In this review, we delve into the biogeochemical behaviors of arsenic in paddy soil-rice system, systemically revealing the complexity of its migration and transformation processes, including the release of arsenic from soil to porewater, uptake and translocation of arsenic by rice plants, as well as transformation of arsenic species mediated by microorganism. Especially, microbial processes like reduction, oxidation and methylation of arsenic, and the coupling of arsenic with carbon, iron, sulfur, nitrogen cycling through microbes and related mechanisms were highlighted. Environmental factors like pH, redox potential, organic matter, minerals, nutrient elements, microorganisms and periphyton significantly influence these processes through different pathways, which are discussed in this review. Furthermore, the current progress in remediation strategies, including agricultural interventions, passivation, phytoremediation and microbial remediation is explored, and their potential and limitations are analyzed to address the gaps. This review offers comprehensive perspectives on the complicated behaviors of arsenic and influence factors in paddy soil-rice system, and provides a scientific basis for developing effective arsenic pollution control strategies.
稻田砷污染严重威胁着水稻生长、粮食安全和人类健康，已成为公众关注的焦点。本综述深入探讨了砷在稻田土壤-水稻系统中的生物地球化学行为，系统揭示了其迁移转化过程的复杂性，包括砷从土壤向孔隙水的释放、砷被水稻吸收和转运，以及微生物介导的砷形态转化。特别是，强调了砷的还原、氧化和甲基化等微生物过程，以及微生物与相关机制通过砷与碳、铁、硫、氮循环的耦合。pH 值、氧化还原电位、有机质、矿物质、营养元素、微生物和周丛生物等环境因素通过不同途径显著影响这些过程，本综述对此进行了讨论。此外，还探讨了目前修复策略的进展，包括农业干预、钝化、植物修复和微生物修复，并分析了它们的潜力和局限性，以解决存在的差距。本综述全面探讨了砷在稻田土壤-水稻系统中的复杂行为及其影响因素，为制定有效的砷污染控制策略提供了科学依据。
