Effects of antibiotics and heavy metals on denitrification in shallow eutrophic lakes

被引：28

作者：

Deng, Fei ^{[1
]}

Zhang, Dongwei ^{[1
]}

Yang, Liting ^{[1
]}

Li, Lijuan ^{[1
]}

Lu, Yu ^{[1
]}

Wang, Jing ^{[1
]}

Fan, Yujiao ^{[1
]}

Zhu, Yanrong ^{[2
]}

Li, Xiaowen ^{[3
]}

Zhang, Yao ^{[1
]}

机构：

[1] Hubei Univ Med, Ctr Environm & Hlth Water Source Area South To No, Sch Publ Hlth, Shiyan 442000, Peoples R China

[2] Changjiang Water Resources Commiss, Bur Hydrol, Hanjiang Bur Hydrol & Water Resources Survey, Xiangyang 441022, Peoples R China

[3] Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, State Key Lab Freshwater Ecol & Biotechnol, 7 Donghu South Rd, Wuhan 430072, Peoples R China

来源：

CHEMOSPHERE | 2022年 / 291卷

基金：

中国国家自然科学基金;

关键词：

Antibiotic; Heavy metal; Eutrophication; Denitrification; Shallow lake; TROPHIC STATE; COMMUNITY; WATER; SEDIMENTS; BACTERIA; NIRS; RESISTANCE; DIVERSITY; ARSENITE; NITROGEN;

D O I：

10.1016/j.chemosphere.2021.132948

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Antibiotic and heavy metal residues in shallow lakes caused by aquaculture and human activities such as sewage discharge have attracted much attention and public concern. However, mechanisms by which these environ-mental pollutants affect the microorganism-mediated biogeochemical cycle are unknown. This study focused on the effects of antibiotics, heavy metal, and antibiotic resistance genes (ARGs) on denitrification in shallow lakes. The results showed that antibiotics and metal elements had inhibitory effects on denitrification, whereas AGRs exhibited stimulating effects. Specifically, the enrofloxacin concentration showed a significant negative corre-lation with the copy number of denitrifying bacteria, whereas the copy number of the ARGs sulI, sulII, and tetG showed significant positive correlations. In addition, tetG was closely related to the community structure of nirS-type denitrifiers, and nirS-type denitrifiers were significantly correlated with the potential denitrification rate (PDR). Furthermore, the ARGs sulI, sulII, and tetG were positively correlated with PDR (P < 0.05). By contrast, the metal elements arsenic, manganese, cobalt, and antimony were negatively correlated with the copy number of denitrifying bacteria. Arsenic was significantly correlated with the community composition of nirK-type de-nitrifiers, but nirK-type denitrifiers did not show a significant correlation with the PDR. This work extends our understanding of the effects of antibiotics and heavy metals on denitrification, but further studies are needed to determine the interaction effects of pollutants.

引用

页数：10

共 59 条

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