The Contamination Characteristic of Cadmium in Soil and Green Plant in the Downtown Area of Zhaoyuan City

In April 2010, the soil and common green plants samples in the downtown area of Zhzoyuan City were gathered to study the cadmium (Cd) pollution characteristics of plants and soils in Zhaoyuan city. The investigation area was divided into 5 zones as industrial zone, inner commercial, inner residence, Traffic Area, Park and Plaza, the soil and plants sample was collected according the Uniform distribution principle with GPS. The content of Cd in soil and plants was detected by ABS. The study showed that Cd concentration in soil was accumulated at a high level, the lowest is 3.38mg/kg and the highest is 8.32mg/kg, the soil is polluted severely, its content is more than III standard. Different area has different Cd content: industrial zone is the highest, 6.98mg/kg is at the top, Park and Plaza is at the lowest, the difference in the concentration is not very great, the city´s pollution has been fairly well-distributed. The physics and chemistry characteristics of soil, such as pH, CEC and organic matter are the factors that influence the Cd concentration. The study showed that only pH has the significantly correlation with Cd concentration. Other rationalized in the Cd in the concentration is not obvious relevance. Cd concentration in plants is 0.53-0.84mg/kg. The positive relationship is significant between soil and plants about the Cd concentration.