Fe对稻田土壤重金属迁移转化影响机制及研究进展

doi:10.13745/j.esf.sf.2023.9.12

地学前缘 ›› 2024, Vol. 31 ›› Issue (2): 103-110.DOI: 10.13745/j.esf.sf.2023.9.12

• 农田土壤污染机制与风险评价 • 上一篇下一篇

Fe对稻田土壤重金属迁移转化影响机制及研究进展

李杉杉¹(), 张荣¹, 费杨¹, 梁家辉¹, 杨兵¹, 王萌², 师华定¹, 陈世宝²^,^*()

1.生态环境部土壤与农业农村生态环境监管技术中心, 北京 100012
2.中国农业科学院农业资源与农业区划研究所北方干旱半干旱耕地高效利用全国重点实验室, 北京 100081

收稿日期:2023-09-12 修回日期:2023-09-29 出版日期:2024-03-25 发布日期:2024-04-18
通讯作者: *陈世宝(1971—),男,研究员,博士生导师,从事土壤重金属污染防治与环境基准研究工作。E-mail: chenshibao@caas.cn
作者简介:李杉杉(1986—),女,博士,副研究员,主要从事农用地土壤重金属源头防控和风险管控研究工作。E-mail: lishanshan@tcare-mee.cn
基金资助:
国家自然科学基金面上项目(42177010);国家重点研发计划项目(2020YFC1806304)

How iron influence heavy metal migration and transformation in paddy soils—a review

LI Shanshan¹(), ZHANG Rong¹, FEI Yang¹, LIANG Jiahui¹, YANG Bing¹, WANG Meng², SHI Huading¹, CHEN Shibao²^,^*()

1. Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
2. State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received:2023-09-12 Revised:2023-09-29 Online:2024-03-25 Published:2024-04-18

摘要/Abstract

摘要：

我国是全球最大的水稻生产国和消费国,部分地区稻田土壤重金属污染严重,威胁粮食安全和人体健康。目前稻田土壤重金属复合污染是我国土壤污染治理的重点和难点。Fe在地壳中分布广泛,居元素分布序列的第四位,是土壤中的高活性元素,参与多种重金属的地球化学过程。文章针对Fe氧化物对重金属的作用机制、土壤中Fe的生物化学过程、稻田系统中Fe对重金属吸收转运的影响,以及Fe相关材料在重金属污染土壤修复中的应用等方面进行总结。结果显示:(1)土壤中Fe氧化物主要通过吸附/络合/沉淀作用固定重金属,或通过氧化还原作用降低重金属的毒性和有效性;(2)土壤环境的变化容易引起Fe氧化物的还原溶解/氧化沉淀,以及微生物介导的Fe(III)还原和Fe(II)氧化等过程;(3)稻田环境变化关系到土壤中Fe氧化物的形态转化、水稻根表铁膜的形成与成矿过程、水稻对Fe的吸收转运等,从而影响重金属在土壤-水稻中的运移;(4)Fe相关材料对土壤单一重金属污染修复效率高,但尚未在重金属复合污染土壤修复中大面积应用。同时,对我国当前Fe相关材料在稻田重金属复合污染修复应用中存在的问题进行思考,对今后的研究方向进行展望,以期为稻田重金属复合污染修复的推广应用提供参考与借鉴。

关键词: 稻田土壤, 重金属复合污染, Fe, 土壤修复

Abstract:

China is the world’s largest producer and consumer of rice. In some areas heavy metal contamination of paddy soils is a serious problem and poses risks to food security and human health. At present, the major challenge for soil pollution control in China is remediation of paddy soils contaminated with multiple heavy metals. Iron, as the fourth most abundant element in the Earth’s crust and a highly reactive element in soils, is involved in the geochemical processes of many heavy metals. In this review, the mechanism by which iron oxides influence heavy metals, the biochemical process of iron in soils, the effects of iron on heavy metal transformation in soil-rice system, and the application of iron derived materials in the remediation of heavy metal contaminated soils are summarized as the follows: (1) Iron oxides in soils can achieve heavy metal fixation through adsorption/complexation /precipitation, and can reduce heavy metal bioavailability through redox reaction. (2) With change of soil environmental conditions iron oxides are prone to reduction-dissolution/oxidation-precipitation or microbial mediated Fe(III) reduction and Fe(II) oxidation. (3) Change of soil pH and Eh in paddy soils can lead to transformation of iron oxides, formation of iron plaque, and iron uptake by rice, which in turn can affect heavy metal transport in soil-rice system. (4) Iron derived materials show high remediation efficiency for soils contaminated with a single heavy metal, but such materials have not been widely used for remediation of soils contaminated with multiple heavy metals. To provide a reference for addressing this issue this paper discusses the application-related problems and proposes future research directions.

Key words: paddy soil, combined pollution of heavy metals, iron, soil remediation

中图分类号:

李杉杉, 张荣, 费杨, 梁家辉, 杨兵, 王萌, 师华定, 陈世宝. Fe对稻田土壤重金属迁移转化影响机制及研究进展[J]. 地学前缘, 2024, 31(2): 103-110.

LI Shanshan, ZHANG Rong, FEI Yang, LIANG Jiahui, YANG Bing, WANG Meng, SHI Huading, CHEN Shibao. How iron influence heavy metal migration and transformation in paddy soils—a review[J]. Earth Science Frontiers, 2024, 31(2): 103-110.

图/表 2

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Fe对稻田土壤重金属迁移转化影响机制及研究进展

How iron influence heavy metal migration and transformation in paddy soils—a review

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