根系土中重金属元素分布特征及在农作物中的迁移

以上海市金山区为对象,分析了农用地土壤重金属元素的形态分布特征,以及元素的有效态（水溶态、离子交换态）与全量、有机质、pH等的相关性;根据重金属元素在稻米、蔬菜等不同农作物中的含量,分析了其迁移及生物有效性。结果表明：不同元素的形态组成差异较大;Pb、Zn、Ni元素的有效态与环境因素（pH、有机质）关系密切;土壤中重金属元素Cd最为活跃且易发生迁移,在多种农作物中有较为明显的富集;稻米中重金属元素的富集程度相对较小。研究成果可为土壤污染治理、种植结构调整、土地合理利用提供有益借鉴。

The Distribution of Heavy Metals in the Rhizosphere and Their Migration in Crops

This paper examines the distribution patterns of heavy metals,and the correlation between their effective phases（e.g.,the water soluble phase and ion exchange phase） and their overall concentration,organic matter content,and pH in farmland in the Jinshan district.It also discusses the influence of concentration on element migration and biological accumulation in rice and vegetable crops.The statistical results indicate that there are large differences in the distributions of the various elements,and that the effective phases of Pb,Zn,and Ni are closely related to environmental factors such as pH and organic matter content.Cadmium is the most active element in the soil,it migrates readily and accumulates in a variety of crops,although the heavy metal concentration in rice is less than that in other crops.These results provide a useful reference point for those involved with the treatment of polluted soil,and the development of optimum planting strategies and land use.