Abstract：
The performance of biochar (BC) in reducing the transport of antibiotics under field conditions has not been sufficiently explored. In repacked sloping boxes of a calcareous soil, the effects of different BC treatments on the discharge of three relatively weakly sorbing antibiotics (sulfadiazine, sulfamethazine, and florfenicol) via runoff and drainage were monitored for three natural rain events. Surface application of 1 % BC (1 %BC-SA) led to the most effective reduction in runoff discharge of the two sulfonamide antibiotics, which can be partly ascribed to the enhanced water infiltration. The construction of 5 % BC amended permeable reactive wall (5 %BC-PRW) at the lower end of soil box was more effective than the 1 %BC-SA treatment in reducing the leaching of the most weakly sorbing antibiotic (florfenicol), which can be mainly ascribed to the much higher plant available and drainable water contents in the 5 %BC-PRW soil than in the unamended soil. The results of this study highlight the importance of BC\'s ability to regulate flow pattern by modifying soil hydraulic properties, which can make a significant contribution to the achieved reduction in the transport of antibiotics offsite or to groundwater.
摘要：
生物炭（BC）在田间条件下减少抗生素运输的性能尚未得到充分探索。在重新包装的倾斜的钙质土壤中，不同BC处理对三种相对弱吸附抗生素(磺胺嘧啶，磺胺二甲嘧啶,和氟苯尼考）通过径流和排水进行了三个自然降雨事件的监测。1％BC（1％BC-SA）的表面应用最有效地减少了两种磺胺类抗生素的径流排放，这可以部分归因于水渗透的增强。在土壤箱的下端建造5％BC修正的渗透反应壁（5％BC-PRW）比1％BC-SA处理更有效地减少了最弱吸附抗生素（氟苯尼考）的浸出，这主要归因于5％BC-PRW土壤中的可用植物和可排水水含量比未经改良的土壤高得多。这项研究的结果突出了BC通过改变土壤水力特性来调节流动模式的能力的重要性，这可以为减少抗生素的异地运输或向地下水的运输做出重大贡献。
