干旱区耕作土壤中重金属镉铅镍剖面分布及行为研究--以白银市区灰钙土为例

通过对干旱区长期污灌农田土壤中重金属的剖面分布及行为进行研究,结果表明:在长期灌溉与降水下渗水流作用下,重金属物质可发生不同程度的淋溶迁移;迁移程度依次为Cd>Ni>Pb;元素Cd具有显著的负指数迁移规律,而元素Pb、Ni规律性不明显.

Study on the Distribution and Behavior of Selected Metals (Cd, Ni, Pb)in Cultivated Soil Profile in Arid Zone (Take Baiyin Region as an Example)

In this paper, the distribution and behavior of selected heavy metals (Cd, Ni, Pb) in cultivated soil profile in arid zone irrigated with waster water for a long time had been investigated. Results showed that there had the different levels of leaching transport for different elements under the influence of infiltration of irrigation or precipitation, and the order of element transport levels was: Cd>Ni>Pb. The significant model of negative exponential function was found for Cd to explain the heavy metal transfer in soil profile, and none for Pb and Ni.