农业环境科学学报2026，Vol.45Issue(5)：1277-1290,14.DOI:10.11654/jaes.2025-0430
根系分泌物调节抗生素-重金属复合污染底泥的植物修复效果及微生物机制
Efficiencies and microbial mechanisms of root exudate regulation on the phytoremediation of antibiotic-heavy metal polluted sediment
摘要
Abstract
Antibiotics and heavy metals from aquaculture that are not fully treated are discharged with wastewater and accumulate in sediments.To address this co-contamination issue,this study employed waterlogged pot experiments,adding oxytetracycline(OTC),copper(Cu),and zinc(Zn)to simulate composite-polluted sediments.Canna indica was selected as the remediation plant,with four exogenous root exudate doses(0,5,10,15 mL·pot-1)to investigate their regulatory effects on remediation efficiency and microbial mechanisms,comparing pollutant removal efficiencies under plant-free and plant-combined conditions.Results demonstrated that plant combination significantly enhanced remediation:compared to plant-free groups,plant combination increased OTC removal by 4.8％-17.5％across all exudate doses,with optimal efficiency at 10 mL·pot-1(11.8％-17.5％increase vs.plant-free groups).For Cu and Zn,the 15 mL·pot-1 dose in plant-free groups significantly improved removal by 19.6％and 9.8％,respectively,while the 10 mL·pot-1 dose under plant-combined conditions yielded the best results.At this dose,the bioavailable fractions of Cu/Zn peaked,promoting their accumulation in the belowground parts of Canna indica.Simultaneously,exogenous root exudates ameliorated the inhibition of chlorophyll synthesis in plants,with the 10 mL·pot-1 dose showing the most significant effect.Plant combination stabilized the sediment environment,reducing fluctuations in dehydrogenase activity.Through rhizosphere effects,it also enhanced microbial species richness and diversity,suppressed dominant bacterial proliferation,increased functional microbe abundance,and improved community stability under stress.This study reveals that root exudates strengthen remediation via a tripartite synergistic mechanism,including activating heavy-metal fractions,improving plant physiology,and optimizing microbial community structure,highlighting its critical significance for rehabilitating antibiotic-heavy metal co-contaminated sediments.关键词
根系分泌物/抗生素/重金属/底泥/植物修复/微生物群落结构Key words
root exudates/antibiotics/heavy metals/sediments/phytoremediation/microbial community structure分类
资源环境引用本文复制引用
卢烨彬,张雪琦,漆世英,韩善锐,李威,徐玲娥,成水平..根系分泌物调节抗生素-重金属复合污染底泥的植物修复效果及微生物机制[J].农业环境科学学报,2026,45(5):1277-1290,14.基金项目
国家重点研发计划项目(2023YFC3207503) （2023YFC3207503）
中国电建集团华东勘测设计研究院有限公司科技项目(HDY-CGHT19-20240098Y)National Key Research and Development Program of China(2023YFC3207503) （HDY-CGHT19-20240098Y）
Science and Technology Project of PowerChina Huadong Engineering Corporation Limited(HDY-CGHT19-20240098Y) （HDY-CGHT19-20240098Y）
