关键词: 油菜, 镉, 铅, 汞, 积累吸收

Abstract: Rapes, which widely eaten by people, were selected as studying objects in this research, soil culture experiments was managed.We studied the absorbing and accumulating characters of heavy metals in rape under the pressure from different concentrations of heavy metals (cadmium, lead, mercury), and discussed the migration of heavy metals in soil-vegetable system.The results show that the absorbing and accumulating rules of different heavy metals in different parts of rape are different.The accumulation order of cadmium and mercury in the rape plants was ranged as roots >leaves >stems, and the accumulation order of lead in the rape plants was ranged as roots >stems >leaves.Rape roots have much stronger ability in accumulating heavy metals than stems and leaves, The adsorptive ability to heavy metals is:Cd >Hg >Pb.The contents of heavy metals in different parts of rape was significantly linearly correlated to the concentrations of heavy metals in the soil (r²>0.859).According to the national regulation about the maximum limit of heavy metals in edible parts of vegetables (GB 15201-1994, GB14935-1994, GB 2762-1994), the thresholds of cadmium, lead and mercury in soil for rape were 0.36 μg/g, 43.62 μg/g and 2.89 μg/g。

Key words: rape, cadmium, lead, mercury, absorption and accumulation