城郊土壤共存元素对土壤作物系统Cd、Pb迁移的影响分析——以白银市城郊区为例

Influence of Co-exist Heavy Metals on the Transfer of Cadmium and Lead in Soil-Wheat Root System in Suburb Land ——Taking the Baiyin suburb as an example

通过共存元素对土壤小麦系统Cd、Pb行为影响的调查研究发现 :大田条件下共存元素以正对数模式与根系Cd、Pb密切相关 ,同种元素间相关程度最高 ;根系Cd、Pb积累主要取决于土壤环境Cd、Pb的含量 ,共存元素也产生一定的影响。认为要防止重金属通过食物链对人类的危害 ,就必须降低土壤环境中重金属的总量。

Investigation of relationships between the co exist trace element contents and the selected metal (cadmium and lead) contents in soil-wheat root system under the actual conditions was carried out.The positive logarithmic models of the influence of co exist elements on transport of Cd and Pb was highly significant, and the most significant equations occurred between the same kind metals. The accumulative levels of selected heavy metals in wheat root were mainly dependent on the same kind elements in soil, and to a certain extent, the co exist trace metals had some functions on the absorption of root.It is concluded that the contents of co exist elements in soil was the only feasible way to protect human being food chain from heavy metals.