Effects of Combined Pollution of Cu,Zn,Pb and Cd on Growth of Tomato and Heavy Metal Accumulation Regularity

Heavy metal pollution in agricultural land becomes more and more serious in recent years. The soil culture experiments were performed to study the effects of combined pollution of Cu,Zn,Pb and Cd on growth of tomato and heavy metal accumulation regularity. The results showed that with the increasing of soil heavy metals Cu, Zn,Pb and Cd,the content of Cu,Zn,Pb and Cd in root of tomato were obviously increased. Zn and Cd content in stems and leaves were increased. Cu and Pb content in stems and leaves were not obviously increased,Cu,Zn,Pb and Cd content in fruits were increased slightly. Cu,Zn,Pb and Cd uptake in stems and leaves of tomato were far greater than that of fruits and roots. When the soil heavy metals content were higher,Cu and Pb uptake in the stems and leaves decreased due to the decreasing of biomass. With the increasing of soil heavy metals content,Cu,Zn and Pb uptake in leaves of tomato were firstly increased and then decreased. With the increasing of heavy metals content in soil,Cd uptake in stems and leaves in tomato was rising trend. With the increasing of soil heavy metals content, Cu,Zn,Pb and Cd uptake in fruits were not changed significantly,Cu and Pb uptake in root was always increased, while Zn and Cd uptake in root changed slightly. In the same soil heavy metal processing conditions,the accumulation ability of heavy metal elements in each part of tomato was Cd Zn Cu Pb. The distribution of heavy metals of Cu,Zn,Pb and Cd in different parts of tomato was root stem and leaf fruit.