数字农科院2.0

Optimizing initial C/N ratio of returned straw with urea mitigates the spread of antibiotic resistance genes in soil

文献类型： 外文期刊

作者： Lijuan Zhao;Zhen Tao;Siyi Li;Taotao Chen;Zhongyang Li;Yuan Liu

作者机构：

关键词： ARGs;C/N ratio;Soil;Straw return

期刊名称： Journal of Environmental Chemical Engineering

ISSN： 2213-3437

年卷期： 2025 年 13 卷 5 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Straw return (SR) can affect the environmental behavior of pollutants. Currently, the impact of SR on the distribution and dynamics of soil antibiotic resistance genes (ARGs) remains inconclusive. Specially, the response of soil ARGs to the C/N ratio of straw returned to the soil has received scant attention. Here, a soil culture experiment was conducted to evaluate the impact of wheat straw return at varying C/N ratios adjusted with urea, and the ARG assembly and the probable propagators such as soil chemical properties, microbial community structure, mobile genetic elements (MGEs), and heavy metal resistance genes (MRGs) were analyzed. The results revealed that, after 60 days of incubation, C/N42 (only soil and straw) increased the absolute abundance of most ARG subtypes in the soil relative to CK (soil only), while C/N15 lowered the levels of soil ARGs, NH4+-N, NO3--N, pH, and bioavailable Hg, and altered the soil microbial community structure. Compared with C/N42, the copy number of individual MRG and ARG subtypes in C/N15 decreased by 0.87 %-100 % and 20.33 %-100 %, respectively. Acidobacteria, Methylomirabilota, and Myxococcota, identified as potential host bacteria of ARGs, were associated with the removal of most ARGs. Chytridiomycota and Basidiomycota, potentially the primary fungi degrading straw, act synergistically with soil bacteria. Network and PLS-PM analysis across all treatments showed that soil MRGs and chemical properties accounted for more variance in ARG distribution than microbial communities and MGEs did. This study provides innovative insights into alleviating ARGs dissemination in farmland soil under the condition of SR.

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