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<p>Soil contamination with toxic metal(loids) such as arsenic (As), cadmium (Cd) and lead (Pb) poses significant threats to ecosystem by disrupting microbial community. However, the changes in soil microbial community structure and function induced by migration of toxic metal(loid)s at a lead–zinc smelting site remain poorly understood. This study investigated microbial community structure and function in soils after As, Cd, and Pb migration and retention using 16S rDNA sequencing and PICRUSt2 prediction. And Partial Least Squares Path Modeling (PLS-PM) was used to determine key factors influencing microbial community after toxic metal(loid)s retention. Results showed that after As, Cd, and Pb retention, Pb had stronger impact on soil microbial community structure than As and Cd. The difference in toxic metal(loid)s-sensitive genera (<i>Escherichia</i>, <i>Lactobacillus</i>) and toxic metal(loid)s-resistant genera (<i>Bacteroide</i>s, <i>Rhodanobacter</i>, <i>Acidibacter</i>) were identified. pH regulated the resistance of dominant genera to toxic metal(loid)s. The retention of As, Cd, and Pb induced stress that reduced the metabolic capacity of microbial communities, while increasing the relative abundance of their environmental processing functions. Soil microbial communities appeared to respond to As stress by enhancing amino acid synthesis, DNA repair capacity, and membrane fluidity, while they resisted Cd and Pb stress through metabolic accumulation and repair mechanisms. Soil pH had significantly stronger influence on microbial communities than the stress effect of bio-Cd. The total content of As and Pb was primary factor directly affecting microbial community structure in the soil. <i>Rhodanobacter</i>, <i>Ralstonia</i>, and <i>Acidibacter</i> were potentially influencing the migration ability of As, Cd and Pb. This finding provides theoretical guidance for predicting the ecology risks in toxic metal(loid)-contaminated soils, assessing shifts in microbial indicators and promoting potential microbial-mediated remediation strategies.</p>

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Changes in Soil Microbial Community Structure and Function Induced by Migration of Toxic Metal(loid)s in Soils

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Luhua Jiang,
  • Jiejie Yang,
  • Jiaxin Shi,
  • Ziwen Guo,
  • Yulong Peng,
  • Manjun Miao,
  • Junzhao Wu,
  • Bo Miao,
  • Huidan Jiang,
  • Hongwei Liu,
  • Yili Liang,
  • Huaqun Yin,
  • Xueduan Liu

摘要

Soil contamination with toxic metal(loids) such as arsenic (As), cadmium (Cd) and lead (Pb) poses significant threats to ecosystem by disrupting microbial community. However, the changes in soil microbial community structure and function induced by migration of toxic metal(loid)s at a lead–zinc smelting site remain poorly understood. This study investigated microbial community structure and function in soils after As, Cd, and Pb migration and retention using 16S rDNA sequencing and PICRUSt2 prediction. And Partial Least Squares Path Modeling (PLS-PM) was used to determine key factors influencing microbial community after toxic metal(loid)s retention. Results showed that after As, Cd, and Pb retention, Pb had stronger impact on soil microbial community structure than As and Cd. The difference in toxic metal(loid)s-sensitive genera (Escherichia, Lactobacillus) and toxic metal(loid)s-resistant genera (Bacteroides, Rhodanobacter, Acidibacter) were identified. pH regulated the resistance of dominant genera to toxic metal(loid)s. The retention of As, Cd, and Pb induced stress that reduced the metabolic capacity of microbial communities, while increasing the relative abundance of their environmental processing functions. Soil microbial communities appeared to respond to As stress by enhancing amino acid synthesis, DNA repair capacity, and membrane fluidity, while they resisted Cd and Pb stress through metabolic accumulation and repair mechanisms. Soil pH had significantly stronger influence on microbial communities than the stress effect of bio-Cd. The total content of As and Pb was primary factor directly affecting microbial community structure in the soil. Rhodanobacter, Ralstonia, and Acidibacter were potentially influencing the migration ability of As, Cd and Pb. This finding provides theoretical guidance for predicting the ecology risks in toxic metal(loid)-contaminated soils, assessing shifts in microbial indicators and promoting potential microbial-mediated remediation strategies.