土壤衙金属复合污染对油菜生长的影响

采用盆栽试验的方法，研究了潮褐土中Ｃｄ、Ｚｎ、Ｐｂ复合污染对油菜的影响。结果表明，Ｃｄ、Ｚｎ协同使产量降低，而Ｐｂ却使油菜产量有所增加，其对产量的影响顺次为Ｚｎ〉Ｃｄ〉Ｐｂ。Ｃｄ、Ｚｎ、Ｐｂ在油菜体内的积累除了受到本元素添加浓度的显著影响外，同时还受到共存元素的影响。共存元素影响较为复杂，其中土壤Ｚｎ含量的增加显著地降低了油菜可食部分对Ｃｄ的吸收。在Ｃｄ、Ｚｎ、Ｐｂ复合效应影响中，其在油菜可仞部分的累积率顺序为Ｃｄ〉Ｚｎ〉Ｐｂ。因此Ｃｄ对人体健康的威胁最大。

The effect of compound pollution of heavy metals on rape

By pot experiment the paper was to study Cd,Zn,Pb compound effects on rape grown in medium loan meadow cinnamon soil. The results showed that the combination of Cd Zn exhibited synergistic decreasing effect on rape yield, whereas Pb element made the rape yield increase in the experiment. The toxicity sequence of the three elements on rape yield was Zn>Cd>Pb. The accumulation of the three elements in rape was evidently affected by their own doses in soil and their interaction. The interactions of these coexisting elements were very complex. In Cd-Zn-Pb coexisting elements, Zn supplied in soil significantly suppressed Cd accumulation in the edible parts of rape. And the accumulation rate of the three elements in rape top was Cd>Zn>Pb in order. Therefore Cd was absorbed very easily by rape and it had the greatest potential toxicity to human.