湿地植物黄花鸢尾对左氧氟沙星的降解机制  

Degradation Mechanism of Levofloxacin by Wetland Plant Iris pseudacorus L.

作　　者：卢洪斌 卢少勇[2] 曾泽泉[1] 贾高彬 黄张根[1] LU Hongbin;LU Shaoyong;ZENG Zequan;JIA Gaobin;HUANG Zhanggen(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;State Key Laboratory of Environmental Criteria and Risk Assessment,National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of Water Sciences,Beijing Normal University,Beijing 100875,China;Shanxi Mingrui Hengxin Environmental Protection Co.,Ltd.,Taiyuan 030001,China)

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西太原030001 [2]中国环境科学研究院,湖泊水污染治理与生态修复技术国家工程实验室,环境基准与风险评估国家重点实验室,北京100012 [3]北京师范大学,水科学研究院,北京100875 [4]山西铭睿恒信环保股份有限公司,山西太原030001

出　　处：《环境科学与技术》2025年第3期163-168,共6页Environmental Science & Technology

基　　金：山西省区域合作项目(202304041101039);中国科学院山西煤炭化学研究所自主创新基金项目-基础研究项目(SCJC-WRW-2023-18);山西省基础研究计划项目(202203021222404);国家环境保护湖泊污染控制重点实验室开放基金项目(2022HPYB-09)。

摘　　要：左氧氟沙星(LVFX)作为典型的抗生素在水环境中被广泛检出。目前,LVFX在人工湿地植物中的迁移转化规律研究较少,人们对LVFX如何胁迫植物的认知仍不充分。基于此,该研究设计分根试验,解析了黄花鸢尾对LVFX的降解和响应机制。研究结果表明:黄花鸢尾对LVFX降解促进作用显著,LVFX在植物根系及茎叶组织中呈现“脉冲式”变化趋势,根系附近LVFX的吸收和释放同时存在,植物吸收LVFX后对其向上传输动力大于向下传输动力。当黄花鸢尾根系接触到LVFX后,植物组织内保护酶活性迅速提高,根系活力增强,抑制LVFX的胁迫作用。该文对深入认识LVFX对植物的胁迫机理,加强人工湿地对LVFX等新污染物控制效能具有促进作用。Levofloxacin(LVFX)is widely detected as a typical antibiotic in the aquatic environment.Currently,there are fewer studies on the transport patterns of LVFX in plants from constructed wetlands,and the knowledge of how LVFX stresses plants is still insufficient.Therefore,this study designed a split-root experiment to analyze the degradation and response mechanism of Iris pseudacorus L.to LVFX.The results showed that Iris pseudacorus L.promoted the LVFX degra⁃dation,and the concentration of LVFX showed a“pulsed”trend in the root,stem and leaf tissues.The upward transmission was greater than the downward transmission for LVFX in plant tissues.The activity of protective enzymes increased rapidly and root vigor was enhanced to defeat the stress when the roots were exposed to LVFX.This paper contributed to a deeper understanding of the stress mechanism of LVFX on plants and enhanced the efficiency of constructed wetlands in controlling new pollutants such as LVFX.

关 键 词：人工湿地 黄花鸢尾 左氧氟沙星 迁移转化 关键酶 

分 类 号：X703[环境科学与工程—环境工程]