Biochar reversed antibiotic resistance genes spread in biodegradable microplastics and Cu co-contaminated soil by lowering Cu bio-availability and regulating denitrification process

文献类型： 外文期刊

第一作者： Wang, Zhenyu

作者： Wang, Zhenyu;Wang, Xuejiang;Xia, Siqing;Zhao, Jianfu;Wang, Zhenyu;Wang, Xuejiang;Xia, Siqing;Zhao, Jianfu;Sun, Ying

作者机构：

关键词： Soil remediation; Cu immobilization; PBAT microplastics; Nitrogen conversion; ARGs propagation; Microbial community

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 2 期

页码：

收录情况： SCI

摘要： This study first revealed how biochar affected antibiotic resistance genes (ARGs) development in Cucontaminated soil coexisting with biodegradable microplastics via microcosm experiments. Results indicated that biodegradable microplastics exacerbated ARGs spread in Cu-contaminated soil by increasing Cu bioavailability, which heightened selective pressure on microbes, and by accelerating the denitrification process, as denitrification genes were closely linked to ARGs. Fortunately, biochar amendment decreased the total ARGs abundance by 41.73 % in co-contaminated soil. The passivation of biochar reduced the proportion of bioavailable Cu by 5.39 %. The denitrification process was also diminished, with a 17.85 % reduction in denitrification genes copies. Additionally, biochar altered the dominant denitrifying genera in soil, shifting from ARGs hosts (e.g., Acinetobacter and Bacillus) to non-hosts (Comamonas). Overall, these findings suggested that biochar adoption could promote Cu immobilization and regulate soil denitrification process, making it an effective strategy to mitigate the ARGs transmission in biodegradable microplastics and Cu co-contaminated soil.

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