中文摘要：

土壤污染日益受到人们的关注，尤其是重金属引起的污染，其中重金属镉有很大的生物毒性，而镉的生物有效性与镉的存在形态密切相关。综述了近年来土壤中镉的植物和生物毒性。土壤中镉的各种形态分布及其土壤pH值、根际效应等影响因素，镉的存在形态与生物有效性的关系及其影响因素等方面的研究进展。同时，对土壤中镉的形态分析方法及生物有效性的发展趋势进行了展望。

英文摘要：

The pollution in soils has been aroused people＇s great concerns in recent years, especially the heavy metals. In these heavy metals, cadmium has serious bioavailability. The bioavailability of cadmium is mainly dependent on its speciation in soils. Research progress of the phytotoxicity and biotoxieity of cadmium in soils, distribution pattern of eadmium and influence of these effect factors such as the pH value of soil and rhizosphere effect, etc., the relationship between the existing form and the bioavailability and their effect factors were summarized in this paper. At the same time, some future research directions such as the analysis methods for form of cadmium and biology effectiveness are forecasted briefly.