Abstract:

The effects of cadmium, lead and their combined pollution on seed germination and biomass of rape were studied by sand culture method. The results showed that the single pollution of Cd2+ was capable to stimulate the germination percentage (GP), germination energy (GE) and the biomass of rape at lower concentration. The single pollution of Pb2 + were capable to stimulate the germination percentage (GP) and germination energy (GE) at lower concentration. These indexes reduced gradually at higher concentration. Under the condition of combined pollution, they were capable to stimulate the germination energy (GE) ,germination index (GI) and the novel weight of root at lower concentration, but the vigor index (VI) were inhibited obviously as the increase of their combined concentration. Under the condition of Pb2 + and their combined pollution, the vigor index (VI), the shoots length of rape and the novel weight of plant were inhibited obviously as the increase of Pb2 +and their combined concentration. Effects of combined pollution were stronger than that of Cd2 + single pollution; meanwhile, effects of Cd2 + single pollution were stronger than that of Pb2 + single pollution.