外源铁对花叶冷水花根表铁膜及磷吸收的影响  

Effect of Exogenous Fe Input on Root Iron Plaque Formation and P Absorption in Pilea cadierei

作　　者：阳路芳[1] 陈春秀[1] 田丽[1] 邓仕槐 胡文 雷建容[1] YANG Lufang;CHEN Chunxiu;TIAN Li;DENG Shihuai;HU Wen;LEI Jianrong(Institute of Agricultural Resources and Environment,Sichuan Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment in Southwest Mountain Areas of Ministry of Agriculture and Rural Affairs,Chengdu 610066,China;College of Environmental Sciences,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川省农业科学院农业资源与环境研究所/农业农村部西南山地农业环境重点实验室,成都610066 [2]四川农业大学资源学院,成都611130

出　　处：《西南大学学报（自然科学版）》2024年第11期165-174,共10页Journal of Southwest University(Natural Science Edition)

基　　金：国家重点研发计划项目(2022YFD1901400);四川省财政自主创新专项(2022ZZCX015);四川省农业科学院“1+9”揭榜挂帅科技攻关项目(1+9KJGG005)。

摘　　要：为探讨不同磷质量浓度处理下,不同质量浓度Fe^(2+)对湿地植物根表铁膜形成及磷吸收的影响,揭示湿地植物根表铁膜在净化磷污染水体中的作用,以花叶冷水花为试材,构建了基质外源铁(Fe^(2+))质量浓度分别为0,500,1 000 mg/kg和污水P质量浓度分别为0,5,10,50,100 mg/L的模拟垂直流人工湿地系统,在系统持续运行6周后,分析各处理下花叶冷水花的株高、干质量、根表铁膜含量,以及根系、地上部分和根表铁膜对磷的吸收量.结果表明:湿地植物根表铁膜的形成受基质中Fe^(2+)质量浓度和污水P质量浓度的共同影响,当P质量浓度不高于10 mg/L时,铁膜量随Fe^(2+)质量浓度增加呈先降低后升高趋势,当P质量浓度不低于50 mg/L时,铁膜量随Fe^(2+)质量浓度的增加而增加;铁膜对磷的吸附量与基质中外源Fe^(2+)加入量和污水中P质量浓度有关,当基质中无外源Fe^(2+)时,P质量浓度增大会抑制花叶冷水花根表铁膜的形成,同时降低铁膜对磷的吸附能力;根表铁膜与花叶冷水花株高增长量呈显著正相关(r=0.713^(**),p<0.01),与花叶冷水花地上部分磷吸收量和铁膜磷吸附量也具有显著正相关性,相关系数分别为0.386^(**),0.476^(**).研究表明:在应用湿地植物花叶冷水花净化高磷污染水体时,适当加入外源Fe^(2+)有利于根表铁膜的形成和花叶冷水花的生长,并促进花叶冷水花地上部分对磷的吸收,达到转移污水中磷的作用,对磷污染水体的植物修复有着重要的意义.To explore the effects of different concentrations of Fe^(2+)on the formation of root surface iron plaque and phosphorus absorption of wetland plants under different phosphorus concentration treatments,and reveal the role of root surface iron film of wetland plants in purifying phosphorus polluted water bodies,based on a constructed wetland model system,this study systematically investigated the influence of iron plaque on phosphorus uptake and accumulation in a typical wetland plant Pilea cadierei.P.cadierei plants were treated with Fe^(2+) and P at a loading rate of 0,500 and 1,000 mg/kg soil,and 0,5,10,50 and 100 mg/L,respectively in a simulated vertical flow wetland system.The plant height,dry mass,content of iron plaque on root surface,and the concentrations of phosphorus in the roots,shoots and iron plaque on the root surface were analyzed after six weeks of continuous operation.The results show that the formation of iron plaque on the root surface of wetland plants in the constructed wetland system was affected by both the content of iron in the substrate and the concentration of phosphorus in the waste water.When P was less than or equal to 10 mg/L,the amount of iron plaque decreased first and then increased with the increase of Fe^(2+)concentration.When P was greater than or equal to 50 mg/L,the amount of iron plaque increased with the increase of Fe^(2+)concentration.The adsorption capacity of iron plaque on phosphorus was related to the content of exogenous iron in the substrate and the concentration of phosphorus in wastewater.When there was no exogenous iron in the substrate,the increase in phosphorus concentration would inhibit the formation of iron plaque on the root surface of P.cadierei,and reduce the adsorption capacity of iron plaque on phosphorus.When exogenous iron was added to the system and the phosphorus concentration was greater than or equal to 50 mg/L,the phosphorus adsorption capacity of the root surface iron plaque increased with the increase of iron concentration.The root surface iro

关 键 词：铁 磷 铁膜 花叶冷水花 磷吸收 富营养化 

分 类 号：X703[环境科学与工程—环境工程]