文献类型： 外文期刊

作者： Li, Zhuoqing ¹ ; Wang, Xinqi ¹ ; Li, Bingyu ¹ ; Ayaz, Tehreem ² ; Lei, Ming ¹ ;

作者机构： 1.Hunan Agr Univ, Coll Environm & Ecol, Changsha 410128, Peoples R China

2.East China Univ Sci & Technol, Coll Resources & Environm Engn, Shanghai 200237, Peoples R China

3.Hunan Acad Agr Sci, Inst Agr Environm & Ecol, Changsha 410125, Peoples R China

关键词： Heavy metal; Antibiotic; Microbial community; Extracellular enzyme activity; Microbial metabolic limitation

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 214 卷

页码：

收录情况： SCI

摘要： Heavy metal or antibiotic contamination significantly affects microbial community structure and soil function. However, the effects of combined heavy metal and antibiotic contamination on soil microbial communities and their metabolic characteristics remain unclear. Hence, this study investigated microbial community responses to sulfamethoxazole (SMX) gradients (0, 1, 10, and 50 mg kg-1) in arsenic (As)-contaminated soils using 16S rRNA sequencing and biochemical analyses. The results showed that bacteria, fungi, and archaea in As-contaminated soils developed distinct adaptation mechanisms to SMX stress. The complexity and connectivity of bacterial networks in As-contaminated soils increased after SMX exposure, while fungal and archaeal networks decreased. Antibiotic-resistant bacteria displaced fungi/archaea as keystone taxa in network hubs due to SMX-driven competitive advantages. SMX stress also increased microbial carbon limitation by 16.6-25.0 % in Ascontaminated soils, attributed to heightened As toxicity and fungal metabolic compensation. Conversely, bacterial community restructuring reduced microbial phosphorus limitation by 4.37-11.4 %. These findings reveal microbial metabolic adaptation mechanisms under combined contamination and offer critical perspectives for soil nutrient management in combined contaminated ecosystems.