数字农科院2.0

Assessing realistic soil microbial risks from metal pollution in a copper mining area through a progressive triad ecological risk assessment

文献类型： 外文期刊

作者： Li Qian;Jinghan Wang;Yajuan Shi;Qiuyun Xu;Ruoyu Liang;Xuan Zhou;Xuan Li;Xiuqing Shao;Weixia Liu;Lianmian Shen;Kexin Wei;Sinan Li

作者机构：

关键词： Ecological risk assessment;Heavy metals;Microbial community;Soil phospholipid fatty acids;Triad approach

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2025 年 500 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Ecological risk assessment (ERA) is crucial for soil protection of contaminated areas. A traditional triad ERA integrates chemical, ecological, and toxicological evidence in parallel, potentially obscuring nuanced pollution-effect relationships under complex field conditions. This study developed a progressive triad approach with consecutive tiers across a 20-km radius of a metal-polluted mining area. The chemical tier identified a 10-km decaying risk zone, attributed to mining-derived As, Cu, Pb, and Zn accumulations. The ecological tier, applying in-situ soil phospholipid fatty acids (PLFAs) investigation, demonstrated metal contamination significantly altered PLFA structure, and reduced gram-positive bacteria and actinomycetes abundance by 59.0 % and 63.6 %. Notably, Cr—not a risk driver in chemical tier—emerged as the strongest metal factor on PLFA profiles, although soil total nitrogen and organic carbon exerted greater overall impacts. This discrepancy underscores actual pollution-effect relationships could be obscured in conventional chemical ERAs. Toxicological validation through incubation experiments with field-relevant Cr (33–73 mg/kg) and Cu (17–130 mg/kg) levels, coupled with 16S rRNA sequencing, confirmed Cr induced greater bacterial compositional shifts than Cu, notably promoting Firmicutes dominance. This framework provides a widely applicable and cost-effective pathway to enhance ecological realism of ERAs in contaminated areas, supporting sustainable environmental management and soil health protection worldwide.

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