The pot culture experiment was conducted in the greenhouse at the south china botanical garden. top soil(0-20 cm) was collected from a local abandoned cabbage garden,and its soil properties were as follows:a soil texture of 70.5% sand,12.2% silt and 17.7% clay;a soil pH of 6.09;an organic matter content of 3.9%; a cation exchange capacity (CEC) of 79.7 mmol.kg; total cadmium concentration of 1.35 mj.kg and available cadmium concentrations of 0.17 mg.kg