Remediation of Soil with Cd, Zn, Pb Combined Pollution by Chlorophytum Comosum Growth

Effect of Cd, Zn, Pb combined pollution on soil enzyme activities, chemical properties, available concentration of the heavy metals in soil and the repairing effect of soil with Cd, Zn and Pb combined pollution by Chlorophytum comosum were researched by using pot experiment. The results showed that Cd and Zn collectively inhibited catalase activity of soil while Pb advanced catalase activity in the condition of Cd, Zn and Pb combined pollution. The compound pollution of Cd, Zn and Pb on phosphatase activity exhibited protective effect. The activities of invertase and urease were all reduced with the increasing concentration of Cd, Zn and Pb. The inhibiting effect of the three heavy metals on soil enzymes had a toxicity order: Cd Zn Pb. The soil enzyme activity of experimental groups was significantly higher than that of control groups. The values of pH and oxidation reduction potential(ORP)were all increased with the increasing concentration of Cd, Zn and Pb. The Organic matter have less to do with the concentration of heavy metals, it did not changed much. Available concentration of the heavy metals in soil of experimental groups was significantly lower than that of control groups owing to the influence of C. comosum. In conclusion, C. comosum has obviously effect in repairing Cd, Zn and Pb combined pollution soils, it has broad application prospects in remediating soil of Cd, Zn and Pb combined pollution.