干湿交替过程中重金属在碱性盐化表层土壤中的迁移特征  

Migration of heavy metals in alkaline saline surface soil during wet-dry alternating process

作　　者：吕佳芮 王祖伟 刘雅明 史明易 LYU Jiarui;WANG Zuwei;LIU Yaming;SHI Mingyi(College of Geographical and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China;Communist Party Building Office of Tianjin Binhai New Area,Taiping Town People′s Government,Tianjin 300282,China)

机构地区：[1]天津师范大学地理与环境科学学院,天津300387 [2]天津滨海新区太平镇人民政府党建办公室,天津300282

出　　处：《天津师范大学学报（自然科学版）》2019年第5期57-63,共7页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(40973078);天津自然科学基金重点资助项目(18JCZDJC98000)

摘　　要：为了研究干湿交替过程中水盐运动引起的表层土壤中重金属的迁移转化规律,利用相连通的2个圆柱体,模拟7 d和14 d两个周期干湿交替过程,并分析其中水盐变化对碱性盐化表层土壤中重金属Cd、Cr、Ni、Cu和Pb等的迁移和转化的影响.结果表明:干湿交替过程中水盐运动最终会造成表层土壤中重金属含量的下降;土壤中重金属总量的变化趋势与含水率相反,而盐度的影响可被水分的影响所掩盖;干湿交替过程中的水盐运动引起重金属形态变化,其中Cd的可交换态含量和Cr、Ni的铁锰氧化态含量增加,Cd的铁锰氧化态含量、Cr的有机结合态含量以及Ni、Cu和Pb的碳酸盐结合态含量减少,而Cu和Pb的有机结合态和铁锰氧化态含量变化基本上体现出此消彼长的特点.这些结果表明,干湿交替过程中的水盐运动对表层土壤中的重金属具有活化作用.In order to learn the migration and transformation of heavy metals in surface soil caused by water and salt movement during wet-dry alternation,the wet-drying alternating progcss with the alternating periods of 7 and 14 days were simulated using two connected cylinders,and the influence of water and salt changes on the migration and transformation characteristics of heavy metals Cd,Cr,Ni,Cu and Pb in the surface soils were studied.The simulation results showed that the water-salt movement during wet-dry alternating process could ultimately reduce the content of heavy metals in the surface soil.The change trend of heavy metal content in soil is opposite to that of water content,and the effect of salinity could be concealed by the effect of water content.Salt and water movement during wet-dry alternating process could make heavy metal speciation changes.The exchangeable Cd and Fe-Mn oxide-bound Cr,Ni in surface soil are increased,but the Fe-Mn oxidebound Cd,organic-bound Cr and carbonate-bound Ni,Cu and Pb are decreased.The changes between organic-bound and Fe-Mn oxide-bound of Cu and Pb reflect the reciprocal characteristics on the whole.Salt and water movement during wet-dry alternating process have the activation on the heavy metals in the surface soil.

关 键 词：干湿交替过程 水盐运动 重金属迁移 表层土壤 

分 类 号：P951[天文地球—自然地理学]