首页 > 过刊浏览>2025年第62卷第1期 >141-152. DOI:10.11766/trxb202310210430
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污染水稻土淹水-落干过程土壤铁形态转化及元素生物有效性的原位监测
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中图分类号:

S153;X53

基金项目:

国家重点研发计划项目（2020YFC1806803，2023YFD1702800）和国家自然科学基金项目（41977021，42030709）资助


Soil Iron Speciation Transformation and in-Situ Monitoring of Element Bioavailability During the Flooding-drainage in Polluted Paddy Soils
Author:
  • ZHAO Wantong

    ZHAO Wantong

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • WANG Yufeng

    WANG Yufeng

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • LIU Zhe

    LIU Zhe

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • HUANG Qiaoyun

    HUANG Qiaoyun

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • YI Ceng

    YI Ceng

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • FENG Xionghan

    FENG Xionghan

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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  • WANG Xiaoming

    WANG Xiaoming

    State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Hubei Key Laboratory of Soil Environment and Pollution Remediation, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
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Fund Project:

Supported by the National Key Research and Development Program of China (Nos. 2020YFC1806803 and 2023YFD1702800) and the National Natural Science Foundation of China (Nos. 41977021 and 42030709)

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    摘要:

    针对我国水稻土重金属污染问题，以广东韶关大宝山矿区污染水稻土为研究对象，通过淹水-落干培养实验，结合化学提取、薄膜扩散梯度技术（DGT）和相关分析，探究了磷酸盐（P）或腐殖酸（HA）添加对土壤铁（Fe）形态及相关元素生物有效性的影响。结果表明：淹水2 d至42 d，酸溶性Fe2+、无定形Fe（Feox）和Fe活化度分别由1.5 g·kg-1升至4.8 g·kg-1、6.6 g·kg-1升至10.1 g·kg-1、21%升至29%，添加P 或HA处理中无定形Fe含量均降低。土壤落干后，Feox和Fe活化度分别快速下降至7.4 g·kg-1和21.6%。对于CaCl2提取态重金属，土壤淹水14 d后降至最低，而落干后砷（As）、镉（Cd）、铜（Cu）和锌（Zn）分别快速增至0.1、0.4、0.3和7.0 mg·kg-1；在淹水初期P处理和HA处理的As含量较对照分别提升了80%和35%，但降低了Cu、Zn和Cd含量，添加HA造成CaCl2提取态Cu、Zn、Cd减少率均大于67%。淹水过程中，DGT提取态P、Fe含量先增加后减小，Zn含量逐渐降低；土壤有效态P、As含量主要受有效态Fe控制；添加P 或HA处理均降低了淹水前期有效Zn含量。上述结果为重金属污染土壤修复和农业安全利用提供了重要的科学依据。

    Abstract:

    【Objective】 Paddy soils are extensively polluted by heavy metals (HMs) in China and present significant challenges for safe agricultural use. Thus, this study seeks to address the heavy metal pollution in China's paddy soils, focusing on polluted soils from the Dabaoshan mining areas in Shaoguan, Guangdong Province.【Method】 A flooding-drainage incubation experiment was conducted and combined with chemical extraction, diffusive gradients in thin films (DGT) technology, and correlation analyses. Also, the impact of phosphorus (P) and humic acid (HA) addition on soil Fe speciation and the bioavailability of related elements was evaluated. The selection of P and HA concentrations was based on common agricultural practices to ensure the environmental relevance of this study.【Results】 The results revealed that soil pH gradually became neutralized while redox potential (Eh) decreased during the flooding period. The concentrations of acid-soluble Fe2+, amorphous Fe, and Fe activation degrees increased from 1.5 g·kg-1 to 4.8 g·kg-1, 6.6 g·kg-1 to 10.1 g·kg-1, and 21% to 29%, respectively, with a decrease in amorphous Fe content observed in treatments with added P and HA from 2 to 42 days of flooding. After soil drainage, both amorphous Fe(Feox) and Fe activation degree rapidly decreased to 7.4 g·kg-1 and 21.6%. Regarding CaCl2-extractable heavy metals, the lowest values were observed after 14 days of flooding, whereas levels of As, Cd, Cu, and Zn rapidly increased to 0.1, 0.4, 0.3, and 7.0 mg·kg-1, respectively, after drainage. The addition of P and HA in the early flooding stage increased the As content by 80% and 35% compared to the control, respectively, but decreased the contents of Cu, Zn, and Cd, with HA addition, the reduction rates of CaCl2-extractable Cu, Zn and Cd were over 67%. During flooding, DGT-extracted P and Fe content initially increased then decreased, while Zn content gradually reduced. The addition of P and HA significantly reduced the bioavailable Zn content in the early stages of flooding while the bioavailable content of P and As was primarily controlled by bioavailable Fe.【Conclusion】 During the soil flooding-drainage incubation, significant changes occurred in soil physicochemical parameters including pH, Eh, and speciation of Fe. The addition of P and HA could regulate the bioavailability of elements such as Fe, P, and HMs. These findings offer valuable insights for the remediation of HMs-polluted soils, highlighting the potential for using P and HA in improving soil quality and ensuring safe agricultural production.

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赵万通,王雨枫,刘哲,黄巧云,易层,冯雄汉,王小明.污染水稻土淹水-落干过程土壤铁形态转化及元素生物有效性的原位监测[J].土壤学报,2025,62(1):141-152. DOI:10.11766/trxb202310210430 ZHAO Wantong, WANG Yufeng, LIU Zhe, HUANG Qiaoyun, YI Ceng, FENG Xionghan, WANG Xiaoming. Soil Iron Speciation Transformation and in-Situ Monitoring of Element Bioavailability During the Flooding-drainage in Polluted Paddy Soils[J]. Acta Pedologica Sinica,2025,62(1):141-152.

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  • 收稿日期:2023-10-21
  • 最后修改日期:2024-04-03
  • 录用日期:2024-07-08
  • 在线发布日期: 2024-07-10
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