淋洗脱盐对滩涂土壤孔隙水重金属垂直迁移的影响  

Effects of leaching desalination on the vertical movement of heavy metals in the pore water of tidal flat soils during reclamation

作　　者：杜烨锋[1] 李取生[1] 陈连运[1] 付红波[1] 童泽军[1] 

机构地区：[1]暨南大学环境工程系,广州510632

出　　处：《生态科学》2009年第1期62-65,共4页Ecological Science

基　　金：基金项目：广东省自然科学基金项目（No.07005931）和国家自然科学基金项目（No.40871154,U0833002）

摘　　要：通过淋洗实验，对滩涂土壤在不同脱盐阶段、不同深度的孔隙水重金属含量、土壤氧化还原电位、孔隙水pH值以及土壤含水率等理化性质进行分析。结果表明：在脱盐过程中，同一盐分梯度孔隙水Cd、Pb和Cr含量从0-10cm到35-50cm土层都呈现由小到大的垂直分布变化，而从35-50cm到50-65cm土层孔隙水Cd、Pb和Cr含量无明显变化：对于不同脱盐阶段土柱，孔隙水Cd含量分布变化不明显，Pb含量从高盐分到低盐分呈现由大到小的变化规律。不同处理孔隙水Cr的平均含量在电导率由7000μs·cm^-1到5000μs·cm^-1时明显减小，而在5000μs·cm^-1以后，含量变化不明显。这一研究结果为治理滩涂土壤重金属污染提供理论依据。Heavy metal concentrations and soil physical and chemical properties such as Eh, pH of pore water and moisture content in different stages of desalination and vertical depths were investigated through leaching experiment. The research results showed that the concentrations of Cd, Pb and Cr in the pore water increased from 0-10 cm to 35-50 cm layer in the same treatment during leaching, whereas the heavy metal concentrations from 35-50 cm and 50-65 cm were just similar. In the different treatments of soil column representing different stages of soil desalination, the concentrations of Cd, Pb and Cr in the pore water showed different characteristics in the distribution. The results are useful for the remediation of reclaimed tidal flat soil polluted by heavy metals.

关 键 词：围垦 滩涂土壤 孔隙水 重金属 

分 类 号：X53[环境科学与工程—环境工程]