Amendment soil with biochar to control antibiotic resistance genes under unconventional water resources irrigation: Proceed with caution

文献类型： 外文期刊

第一作者： Cui, Er-Ping

作者： Cui, Er-Ping;Gao, Feng;Liu, Yuan;Fan, Xiang-Yang;Li, Zhong-Yang;Du, Zhen-Jie;Hu, Chao;Cui, Er-Ping;Gao, Feng;Liu, Yuan;Fan, Xiang-Yang;Li, Zhong-Yang;Du, Zhen-Jie;Hu, Chao;Neal, Andrew L.

作者机构：

关键词： Antibiotic resistance genes; Biochar; Unconventional water resources; Root endophytes; Nutrients

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2018 年 240 卷

页码：

收录情况： SCI

摘要： The spread of antibiotic resistance genes (ARGs) has become a cause for serious concern because of its potential risk to public health. The use of unconventional water resources (e.g., reclaimed water or piggery wastewater) in agriculture to relieve groundwater shortages may result in an accumulation of ARGs in soil. Biochar addition has been proven to be a beneficial method to alleviate the pollution of ARGs in manure-amended soil. However, the role of biochar on ARGs in soil-plant systems repeatedly irrigated with unconventional water resources is unknown. Under reclaimed water or piggery wastewater irrigation, rhizobox experiments using maize plants in soil amended with biochar were conducted to investigate the variation of typical ARGs (tet and sul genes) in soil-plant systems during a 60-day cultivation, and ARGs was characterized by high-throughput qPCR with a 48 (assays) x 108 (samples) array. Only piggery wastewater irrigation significantly increased the abundance of ARGs in rhizosphere and bulk soils and root endophytes. Following 30-day cultivation, the abundance of ARGs in soil was significantly lower due to biochar addition. However, by day 60, the abundance of ARGs in soil supplemented with biochar was significantly higher than in the control soils. Antibiotics, bio-available heavy metals, nutrients, bacterial community, and mobile gene elements (MGEs) were detected and analyzed to find factors shaping ARGs dynamics. The behavior of ARGs were associated with antibiotics but not with bio-available heavy metals. The correlation between ARGs and available phosphorus was stronger than that of ARGs with total phosphorus. MGEs had good relationship with ARGs, and MGEs shifts contributed most to ARGs variation in soil and root samples. In summary, this study provides insights into potential options for biochar use in agricultural activities. (C) 2018 Elsevier Ltd. All rights reserved.

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