Accumulation and Mobility of Heavy Metals Cu,Zn,Pb and Cd in Soil-radish System

Heavy metal pollution in agricultural land becomes more and more serious in recent years. The soil culture experiments were performed to study the accumulation and mobility of heavy metals Cu,Zn,Pb and Cd in soil-radish system. The results showed that the concentration of soil Cu,Zn,Pb and Cd were 800,1 000,1 000,5. 0 mg / kg,the growth of radish was inhibited obviously. With the increase of soil heavy metal concentrations,Cu,Zn,Pb and Cd concentration in root of radish significantly increased. The growth for 90 days,with the increase of soil heavy metal concentration,concentration of Cu,Zn,Pb and Cd in shoot increased significantly. With the growth period extended,Pb concentration in shoot of radish significantly increased. With the increase of soil heavy metal concentrations,Cu,Zn,Pb and Cd concentrations in root of radish were significantly increased. The amount of soil Cu,Zn,Pb and Cd significantly promoted the absorption of radish root,but the soil Cu concentration exceeding a certain range, Cu concentration in root of radish have no significant changes. With the extension of growth time,Zn and Cd in root were significantly decreased,and Pb concentration significantly increased. Distribution of heavy metals in different parts of radish on different soil heavy metals content: the order of Cu,Pb and Cd content was root stem and leaf, the order of Zn content was stem and leaf root. The order of radish enrichment ability was Cd Zn Cu Pb.