Occurrence of antibiotics and antibiotic resistance genes in soils from wastewater irrigation areas in the Pearl River Delta region, southern China
Occurrence of antibiotics and antibiotic resistance genes in soils from wastewater irrigation areas in the Pearl River Delta region, southern China
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DOI：
10.1016/j.scitotenv.2017.12.008
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发表时间：
2018-05-15
影响因子：
9.8
通讯作者：
Chu, L. M.
中科院分区：
文献类型：
--
作者：
Pan, Min;Chu, L. M.
对珠江三角洲地区6个农业试验点的四环素（TC）和磺胺乙嗪（SMZ）及其耐药性基因（ARGs）的发生分布进行了调查。对0 ~ 10 cm和10 ~ 20 cm两个不同深度的灌溉水和灌溉土进行了分析。灌溉水中TC和SMZ的总浓度分别为69.3 ~ 234 ng/L和4.00 ~ 58.2 ng/L，灌溉水土壤中TC和SMZ的总浓度分别为5.00 ~ 21.9 mu g/kg和1.30 ~ 4.20 mu g/kg。长期田间灌溉生活污水和鱼塘污水后，东莞和深圳鱼塘灌溉土壤中TC和SMZ残留量及其对应的ARGs显著高于生活污水灌溉土壤（佛山、广州、惠州和中山）。灌溉水中抗生素及其ARGs浓度显著高于灌溉土，表明废水是土壤环境中抗生素的主要来源。生活污水和鱼塘污水是抗生素及其ARGs的重要资源库，需要对其进行有效处理才能排入环境。其他因素如土壤理化性质、施用肥料、灌溉水源和打顶方式也影响抗生素浓度和ARG丰度。灌溉水和灌溉土中抗生素残留浓度与相应的ARGs呈统计学相关，均随土壤深度的增加而降低，说明环境中抗生素浓度对环境中的微生物产生了选择压力。(C) 2017 Elsevier B.V.版权所有
The occurrence and distribution of tetracycline (TC) and sulfamethazine (SMZ), and the corresponding antibiotic resistance genes (ARGs) were investigated in six agricultural sites in the Pearl River Delta (PRD) region in southern China. Irrigation water and irrigated soils at two different depths (0-10 and 10-20 cm) were analyzed. The total concentrations of TC and SMZ in irrigation water ranged from 69.3 to 234 ng/L and from 4.00 to 58.2 ng/L, respectively, while the total concentrations of TC and SMZ in irrigated soils ranged from 5.00 to 21.9 mu g/kg and from 1.30 to 4.20 mu g/kg, respectively. After long-term irrigation with domestic and fishpond wastewater in the field, the residual TC and SMZ and their corresponding ARGs in soils were significantly higher in fishpond-irrigated soils (Dongguan and Shenzhen) than in domestic wastewater-irrigated soils (Foshan, Guangzhou, Huizhou and Zhongshan). The concentrations of antibiotics and their ARGs were significantly higher in irrigation water than in irrigated soils, which indicated that wastewater was the primary source of antibiotics in the soil environments. The domestic and fishpond wastewater were important repositories of antibiotics and their ARGs, which require effective treatment before their discharge into the environment. Other factors such as soil physicochemical properties, manure application, irrigation water sources and (Topping patterns also affect the antibiotic concentrations and ARG abundances. The residual antibiotic concentrations statistically correlated with the corresponding ARGs in irrigation water and irrigated soils, both of which decreased with increasing soil depth, indicating that the concentration of antibiotics in the environment exerted a selection pressure on the microorganisms in the environment. (C) 2017 Elsevier B.V. All rights reserved.