Soil contamination with antibiotics in a typical peri-urban area in eastern China: Seasonal variation, risk assessment, and microbial responses

论文摘要

The prevalence and persistence of antibiotics in soils has become an emerging environmental issue and an increasing threat to soil security and global public health. The problem is more severe in areas undergoing rapid urbanization; however, the ecological risks of antibiotics,seasonal variability, and associated soil microbial responses in peri-urban soils have not been well-explored. The seasonal soil sampling campaigns were conducted in a typical peri-urban watershed in eastern China to investigate distribution of antibiotics. The results demonstrated higher mean concentrations of most antibiotic compounds in winter than in summer in periurban soils. The seasonal variations of norfloxacin, enrofloxacin, and ciprofloxacin were more significant than those of other antibiotics, due to their higher migration ability and bioavailability.An ecological risk assessment demonstrated that chlortetracycline, ciprofloxacin, doxycycline,and ofloxacin can pose high risks to soil microorganisms. Furthermore, the coexistence of multiple antibiotics obviously poses higher risks than individual compounds. A redundancy analysis demonstrated that tetracyclines mainly showed negative correlations with Firmicutes and Chloroflexi, and quinolones showed obviously negative correlations with Acidobacteria,Gemmatimonadetes, and Nitrospirae, suggesting potential inhibition from antibiotics on biological activities or biodegradation processes. However, the persistence of antibiotics in soil results in a significant decrease in bacterial diversity and a change in dominant species.Our results provide an overview of the seasonal variability of antibiotics and the associated effects on bacterial communities in peri-urban soils. The results can provide scientific guidance on decreasing soil contamination with antibiotics to enhance soil security in similar areas.

论文目录

• Introduction
• 1. Materials and methods
•   1.1. Study area and sampling sites
•   1.2. Chemicals and standards
•   1.3. Sample pretreatment and analysis
•   1.4. Seasonal variation and risk characterization of antibiotics
•   1.5. Characterization of bacterial communities
•   1.6. Statistical analysis
• 2. Results
•   2.1. Occurrence and concentration of antibiotics in soils
•   2.2. Risk assessment of antibiotics in soils
•   2.3. Correlationsbetweenbacterialcommunitiesand antibiotics
• 3. Discussion
•   3.1. Seasonal variation and distribution of antibiotics in soils
•   3.2. Potential risk of antibiotics in soils
•   3.3. Responses of soil bacterial communities to antibiotics
• 4. Conclusions

文章来源

类型: 期刊论文

作者: Fangkai Zhao,Lei Yang,Liding Chen,Qian Xiang,Shoujuan Li,Long Sun,Xinwei Yu,Li Fang

来源: Journal of Environmental Sciences 2019年05期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,University of Chinese Academy of Sciences,Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhoushan Municipal Center For Disease Control and Prevention

基金: supported by the National Natural Science Foundation of China(Nos.41571130064 and 41701018),the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2018057)

分类号: X53;X826

页码: 200-212

总页数: 13

文件大小: 769K

下载量: 71