结果表明各航道底泥中重金属除铅以外，含量均超过《土壤环境质量标准》中的二级标准，其中镉的污染最为严重。

The result showed the heavy metal content in bed mud was over Soil Environmental Quality Standard Two except Pb, in which Cd pollution was the most significant.

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结果表明：园林植物对环境污染物中的铅、镉具有一定的吸收净化能力，并依污染物和植物的不同具有明显差异。

The results show that ornamental plants have certain absorption and purgation ability and have significant differences according to different pollutants and plants.

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综述了镉在环境中的分布、 污染来源及其在土壤中的迁移转化规律，着重讨论了镉在土壤中的赋存形态、 生物有效性以及提取方法的现状和进展。

Progress in distribution, sources and transportation of cadmium in soils are summarized. The occurrence, bioavailability and extraction methodologies for cadmium in soils are discussed in this paper.

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