The physiological and ecological effects on root system of Brassica chinensis grown in hydroponic culture under the stresses at different concentration of Cd and Pb were studied.The experimental results show that the Cd solution concentration of greater than 0.1 mg/L significantly inhibited the root growth, decreased the number of lateral roots,suppressed the root branching,lowered the root biomass and volume,hindered the development of root system,depressed the uptake of Mn,Zn by root,reduced the root ac...