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<p>Heavy metal(loid) contamination in paddy fields poses a major global threat to food security. As a critical soil-plant interface, the rice rhizosphere exerts a “double-edged sword” effect in regulating the speciation and bioavailability of heavy metal(loid)s, driven by its unique redox gradients, dynamic root exudate release, and microbial activity. Herein, we systematically review the speciation transformation and transport characteristics of typical heavy metal(loid)s in the rice rhizosphere. Building on this, we systematically analyze the regulatory mechanisms of different amendments on key rice rhizosphere processes (e.g., pH/Eh dynamics, root exudate profiles, and microbial community structure) to elaborate on the efficacy of soil amendments in heavy metal(loid) immobilization, rice quality improvement, and soil health maintenance. The large body of literature on each soil amendment category underscores growing scientific evidence supporting their utility in mitigating heavy metal(loid) stress in rice systems. This review aims to dissect the remediation mechanisms of heavy metal(loid)-contaminated paddy soils from the perspective of rhizosphere processes, providing a foundational reference for the efficient and innovative development of contaminated soil remediation strategies.</p>

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Mechanisms of Rice Rhizosphere Response to Soil Amendments Under Heavy Metal(loid) Stress- A Review

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Fengfeng Sui,
  • Zhang Gao,
  • Chenyang Qiang,
  • Haoxiang Lu,
  • Jianjun Ma,
  • Liqiang Cui,
  • Guixiang Quan,
  • Jinlong Yan

摘要

Heavy metal(loid) contamination in paddy fields poses a major global threat to food security. As a critical soil-plant interface, the rice rhizosphere exerts a “double-edged sword” effect in regulating the speciation and bioavailability of heavy metal(loid)s, driven by its unique redox gradients, dynamic root exudate release, and microbial activity. Herein, we systematically review the speciation transformation and transport characteristics of typical heavy metal(loid)s in the rice rhizosphere. Building on this, we systematically analyze the regulatory mechanisms of different amendments on key rice rhizosphere processes (e.g., pH/Eh dynamics, root exudate profiles, and microbial community structure) to elaborate on the efficacy of soil amendments in heavy metal(loid) immobilization, rice quality improvement, and soil health maintenance. The large body of literature on each soil amendment category underscores growing scientific evidence supporting their utility in mitigating heavy metal(loid) stress in rice systems. This review aims to dissect the remediation mechanisms of heavy metal(loid)-contaminated paddy soils from the perspective of rhizosphere processes, providing a foundational reference for the efficient and innovative development of contaminated soil remediation strategies.