乌梁素海冰封期砷与环境因子响应及风险评价  

Response between arsenic and environmental factors and risk assessment in Wuliangsuhai during the ice-bound period

作　　者：石文静 赵心亚 刘轶哲 李卫平[1] SHI Wen-jing;ZHAO Xin-ya;LIU Yi-zhe;LI Wei-ping(Autonomous Region Level Ecological Protection and Comprehensive Utilization Cooperative Innovation Center for the Inner Mongolia Section of the Yellow River,School of Energy and Environment,Inner Mongolia University of Science and 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》2024年第2期972-983,共12页China Environmental Science

基　　金：内蒙古自治区自然科学基金项目(2022QN03009);内蒙古自治区事业单位引进高层次人才科研支持项目(2021);内蒙古自治区直属高校基本科研业务费项目(2022);内蒙古科技大学科研启动专项项目;黄河流域内蒙古段复杂河湖环境治理技术应用与示范(2021GG0410)。

摘　　要：以乌梁素海为研究对象,分析冰封期冰-水-沉积物多相介质中砷(As)的分布特征,利用高通量测序技术揭示其主要微生物群落,结合理化因子探究乌梁素海冰封期As与环境因子响应关系并识别影响As分布的关键环境因子,同时综合多种方法进行生态风险评价.结果表明,冰封期乌梁素海各点位沉积物中总砷(TAs)浓度均高于河套平原As背景值,平均浓度为背景值的1.7倍;冰-水-沉积物多相介质中As主要为As(Ⅴ),且TAs浓度的最大值均出现在总排干处;综合多相介质中相关性和冗余分析,冰封期乌梁素海中铁是影响As在冰-水-沉积物相迁移的关键环境因子,微生物在其中扮演重要角色,特别是Thiobacillus、norank_f_Steroidobacteraceae和Bacillus等菌属.风险评价结果表明冰封期乌梁素海表层沉积物大都处于轻度污染,但总排干处已经趋向于偏中度污染,且表层沉积物可能发生As的毒性效应风险,冰封期乌梁素海As的潜在生态风险不容忽视.Analyzed the distribution characteristics of arsenic(As)in ice-water-sediment multiphase media during the ice-bound period,this study took Lake Wuliangsuhai(WLSH)as the studied area.The main microbial community were revealed by high-throughput sequencing technology.Combined with physicochemical factors,its response relationship between As and environmental factors was explored and the key environmental factors were identified in WLSH during the ice-bound period.Meanwhile,assess the ecological risk of As in the surface sediments that used multiple methods.Concentrations of total arsenic(TAs)in the sediments in WLSH during the ice-bound period were higher than the background values of As in the Hetao plain,with an average concentration of 1.7times that of the background value.The main of As was As(V)in ice-water-sediment multiphase media during the ice-bound period in WLSH,and the maximum concentration of TAs appeared at total drainage.Combined with correlation analysis of multiphase media and Redundancy analysis,iron was the key environmental factor affecting the distribution of As in ice-water-sediment during the ice-bound period.Microorganisms play an important role,especially genera such as Thiobacillus,norank_f_Steroidobacteraceae and Bacillus.The risk assessment results indicating that the surface sediment are mostly slightly polluted in WLSH during the ice-bound period,but the total drainage has tended to moderate pollution and the surface sediment may have the risk of As toxicity.The potential ecological risk of As cannot be ignored in WLSH during the ice-bound period.

关 键 词：乌梁素海 冰封期 砷 环境因子 风险评价 

分 类 号：X524[环境科学与工程—环境工程]