植物修复对锰尾渣污染土壤特性的影响

采用盆栽法研究栽培美洲商陆和大豆进行植物修复后,锰尾渣污染土壤特性的变化。栽培美洲商陆和大豆可增加土壤的碱解氮、速效磷、速效钾和有机质。栽培植物后,土壤pH值变化不显著,但土壤磷酸酶、尿酶、蛋白酶、蔗糖酶、硝酸还原酶和脱氢酶的活性都高于对照。栽培植物可影响土壤锰和镉的形态分布,降低土壤锰和镉总含量,减少土壤水溶性锰和镉含量。在锰尾渣污染区域,混种美洲商陆与大豆进行植物修复,改良土壤特性更佳。

Effects of Phytoremediation on Characterization of Soil-Contaminated by Mn Mining Tailings

The aim of this study was to investigate the influence of phytoremediation on characterization of soil-contaminated by Mn mining tailings by using two species,Phytolacca americana and Glycine max.Pot culture experiments were conducted by using Mn mining tailings diluted with clean soil(80% Mn mining tailings 20% soils,DW).The soil organic matter,available N,P,and K increased after phytoremediation for 210 days.The soil pH did not change significantly.The activities of soil enzymes,such as phosphatase,urease,protease,sucrase,nitrate reductase,and dehydrogenase,were all higher in all treatments with phytoremediation than that in controls without phytoremediation.The distribution of Mn and Cd in each fraction were different between the substrates with and without phytoremediation treatments.Comparison with control treatment without phytoremediation,total Mn and Cd decreased in substrates with phytoremediation.The water soluble Mn and Cd were less in substrates with phytoremediation than that in controls.Phytoremediation efforts in areas contaminated by Mn mining tailings can be improved greatly by using mixtures including legume Glycine max and grass species Phytolacca americana.