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Effects of herbicide mixtures on the diversity and composition of microbial community and nitrogen cycling function on agricultural soil: A field experiment in Northeast China

文献类型： 外文期刊

作者： Ma, Qingyun 1 ; Zhou, Yiqing 2 ; Parales, Rebecca E. 3 ; Jiao, Siyu 2 ; Ruan, Zhiyong 2 ; Li, Lin 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Life Sci & Technol, Natl Key Lab Agr Microbiol, Wuhan 430070, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, CAAS,CIAT Joint Lab Adv Technol Sustainable Agr, Beijing 100081, Peoples R China

3.Univ Calif Davis, Coll Biol Sci, Dept Microbiol & Mol Genet, Davis, CA USA

4.Tarim Univ, Coll Life Sci & Technol, Xinjiang Prod & Construct Corps Key Lab Protect &, Alar 843300, Peoples R China

关键词： Soil microbiome; Black soil; Herbicides; Ecological risk; Synthetic communities (SynComs)

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0269-7491

年卷期： 2025 年 372 卷

页码：

收录情况： SCI

摘要： Herbicide mixtures application is a widespread and effective practice in modern agriculture; however, a knowledge gap exists regarding the potential ecotoxicological effects of herbicide mixtures in agricultural systems. Here, the effects of various doses of herbicide mixtures (atrazine, nicosulfuron, and mesotrione) under different varieties of maize cultivation on the structure and function of microbial communities and soil chemical parameters were clarified through field experiments. The results showed that the application of herbicide mixtures increased the bacterial and fungal community alpha diversity at jointing and maturity, indicating a prolonged effect of the herbicide mixtures. Moreover, herbicide mixtures alter the composition of bacterial and fungal communities, with sensitive taxa suppressed and herbicide-tolerant taxa enriched. The herbicide mixtures significantly reduced the abundances of Bacillus even at lower doses, but Penicillum was enriched. FAPROTAX analysis and quantitative PCR (qPCR) results showed that herbicide mixtures inhibited the soil nitrogen-cycle process and related genes AOA-amoA, AOB-amoA, and nifH at maize seedling stage. Moreover, network analysis showed that low concentrations of the herbicide mixtures increased bacterial interactions while high concentrations inhibited them, which indicated that the network complexity may be herbicide concentration dependent. A synthetic community (SynCom) consisting of six bacterial strains was established for the biodegradation of the herbicide mixtures based on the analysis of the bacterial network, which resulted in an increase in the degradation efficiency of nicosulfuron by 15.90%. Moreover, potted maize experiment showed that the addition of the SynCom alleviated the toxic effects of herbicide mixtures on the plants. In summary, this study provides a comprehensive perspective for assessing the ecological risk at taxonomic and functional levels and the biodegradation approach of herbicide mixtures residue on agricultural soils in Northeastern China.

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