Mining,manufacture and disposal of metals and metal-containing meterials inevit ably cause soil contamination.One of the industries formerly causing severe cont amination of soils was the non-ferrous metallurgical industry. Pyrometallurgica l production process lead to large emissions of metals such as Cd,Zn,Pb,Cu,etc.D ue to the phytotoxicity of soil containing high levels of available metals,the n atural vegetation cover might have disappeared to leave a bare site behind. Such bare sites pose a risk for ...