乌梁素海铁还原微生物对砷-磷迁移转化的影响  

Effect of Wuliangsuhai iron-reducing microorganisms on the migration and transformation of As-P

作　　者：石文静 刘轶哲 徐浩然 李卫平[1] SHI Wen-jing;LIU Yi-zhe;XU Hao-ran;LI Wei-ping(Collaborative Innovation Center for Ecological Protection and Comprehensive Utilization of the Inner Mongolia Section of the Yellow River Basin,School of Energy and Environment,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,黄河流域内蒙古段生态保护与综合利用自治区协同创新中心,内蒙古包头014010

出　　处：《中国环境科学》2025年第3期1612-1622,共11页China Environmental Science

基　　金：内蒙古自治区自然科学基金资助项目(2022QN03009);内蒙古自治区直属高校基本科研业务费项目(2022063);内蒙古科技大学科研启动专项项目;内蒙古自治区事业单位引进高层次人才科研支持项目(2021)。

摘　　要：以乌梁素海为研究对象,揭示湖泊沉积物微生物群落结构,阐明代表性铁还原微生物及其丰度,探究铁还原微生物驱动下Fe还原过程对As-P迁移转化影响的季节性差异以及P对As迁移转化的影响,旨在为深化寒旱区湖泊As的环境地球化学行为和As污染修复提供依据,为As污染和富营养化双重风险湖泊的水环境保护提供参考.结果表明,乌梁素海冰封期的铁还原微生物相对丰度较夏季更高.代表性铁还原微生物存在季节性差异,芽孢杆菌属和地杆菌属在冰封期和夏季均为铁还原微生物的优势菌属,但地发菌属也是夏季代表性铁还原微生物之一,而希瓦氏菌属则是冰封期代表性铁还原微生物之一.相关性分析和PLS-SEM模型结果表明在As-P迁移转化中起主要驱动作用的代表性铁还原微生物和其对As-p迁移转化的影响均存在明显的季节性差异.夏季热厌氧菌属虽丰度较小,但其驱动的铁还原过程(路径系数0.178)一定程度影响了沉积物中As和P向水中的释放,芽孢杆菌属也可促使Fe还原(路径系数0.115)驱动As-P的迁移转化.而冰封期时,丰度较高的地杆菌属则是导致As迁移的重要驱动者(路径系数0.530),其对As-P的迁移转化有重要影响,热厌氧菌属对Fe的还原作用(路径系数0.284)以及对As-P迁移转化的影响较夏季更(路径系数0.178).This study taken Wuliangsuhai Lake as the research object to reveal the microbial community structure of lake sediments,elucidated the representative iron-reducing microorganisms and their abundance,investigated the seasonal differences in the impact of iron-reducing microorganisms on As-P migration and transformation during the ice-bound period and the summer,and the impact of P on As migration and transformation,with the aim of providing a basis for deepening the understanding of the environmental geochemical behavior of As in cold and arid regions and As pollution remediation,and providing reference for the water environmental protection of As pollution and eutrophication risks in dual-risk lakes.The results showed that the relative abundance of iron-reducing microorganisms during the ice-bound period was higher than that in summer.There were seasonal differences in the representative iron-reducing microorganisms.Bacillus and Geobacter were the dominant genera of iron-reducing microorganisms during the ice-bound period and summer,but Geothrix was also one of the representative iron-reducing microorganisms in summer,and Shiwanella was one of the representative iron-reducing microorganisms during the ice-bound period.The correlation analysis and PLS-SEM model results showed that the representative iron-reducing microorganisms that play a major driving role in As-P migration and transformation and their impact on As-P migration and transformation exist significant seasonal differences.In summer,although the abundance of Thermoanaerobium was small,the iron-reduction process driven by Thermoanaerobium(path coefficient=0.178)would affect the release of As and P from sediments to water to a certain extent.In addition,Bacillus could also promote the iron-reduction process(Path coefficient=0.115)and was the main driver of As-P mobility and transformation.During the ice-bound period,the more abundant Geobacter was an important driver(path coefficient=0.530)of As mobility,which had an important effect on the mobility and

关 键 词：乌梁素海 冰封期 砷 铁还原微生物 迁移转化 

分 类 号：X172[环境科学与工程—环境科学]