土壤-蔬菜系统中环丙沙星的降解与生物累积特征  

Degradation and bioaccumulation characteristics of ciprofloxacin in soil-vegetable system.

作　　者：肖秋美[1,2,3] 王建武[1,2,3] 唐艺玲[1,2,3] 

机构地区：[1]华南农业大学热带亚热带生态研究所,广州510642 [2]农业部华南热带农业环境重点实验室,广州510642 [3]广东省高等学校农业生态与农村环境重点实验室,广州510642

出　　处：《应用生态学报》2012年第10期2708-2714,共7页Chinese Journal of Applied Ecology

基　　金：广东省科技计划项目"产地环境安全技术研究与示范"(2009A020101005)资助

摘　　要：通过盆栽试验,研究了环丙沙星对菜心、萝卜、番茄和豆角生长的影响及其累积特征和在土壤中的降解规律.结果表明:3种不同添加浓度(5、30和75mg·kg-1)的环丙沙星处理对菜心、番茄和豆角的生物量均无显著影响,而高浓度(≥30mg·kg-1)环丙沙星处理显著抑制萝卜生长;环丙沙星在土壤中的降解随着时间的延长而逐渐变缓,豆角盆栽土壤中环丙沙星的降解半衰期(DT50)为18.3～43.9d,降解90%所需要的时间(DT90)为260～738d;土壤中的环丙沙星均能被4种蔬菜的根系吸收并转移至茎叶部分,而且吸收环丙沙星的量随着土壤中环丙沙星含量的增加而增加;菜心地下部环丙沙星的含量高于地上部;而萝卜地上部环丙沙星的含量高于地下部,番茄和豆角的叶、茎、根的环丙沙星含量均为根>茎>叶.A pot experiment was conducted to investigate the effects of applying ciprofloxacin （CIP） on the growth of flowering Chinese cabbage （Brassica campestris）,radish （Raphanus sativus）,tomato （Solanum lycopersicum） and long bean （Vigna unguiculata）,the bioaccumation of CIP in the vegetables,and the degradation of the antibiotics in soil.The results showed that applying 5,30 and 75 mg·kg-1 of CIP had no significant effects on the plant biomass of flowering Chinese cabbage,tomato and long bean,but the high concentration of CIP （≥30 mg·kg-1） inhibited the radish growth significantly.The degradation of CIP in soil was fast at beginning,but slowed down gradually since then.The DT50 and DT90 of CIP in long bean soil were 18.3-43.9 d and 260-738 d,respectively.The CIP could be absorbed by the roots of all the four vegetables and allocated to their aboveground parts,and the CIP residues in the vegetables in creased with the concentration of CIP in soil.The CIP concentration in flowering Chinese cabbage roots was higher than that in the cabbage aboveground parts,that in radish showed a higher concentration in aboveground parts than in roots,and the CIP concentration in tomato and long bean was in the same order of rootstemleaf.

关 键 词：环丙沙星 土壤 蔬菜 降解 吸收 

分 类 号：X592[环境科学与工程—环境工程]