不同生境山茛菪根部重金属元素季节含量特征

Season features of heavy metal elements in the root of Anisodus tanguticus from different habitats

目的:测定3种不同生境的山莨菪样品(即栽培山莨菪、移栽山莨菪以及野生山莨菪)根部各类重金属元素的含量。方法:采用原子荧光光谱仪测定元素镉、砷、汞,原子吸收光谱仪测定元素铅。结果:栽培、移栽山莨菪根部的砷、汞均有明显季节变化规律,镉含量没有显著的季节特征;移栽、野生2种生境的山莨菪之间存在正相关关系。结论:不同生境下,山莨菪根部各种重金属元素的积蓄规律有明显差异。随着城市的工业生产和交通发展,在土壤中累积并由此进入栽培山莨菪根部的重金属必然多于地处偏僻环境、受工业污染较少的移栽和野生山莨菪。同时,随着海拔的升高,各种重金属元素含量均减少。

Objective：To determine the contents of heavy metals in the root of Anisodus tanguticus samples from three different habitats（cultivated,transplanted,and wild）. Methods：To analyze Cd,As,and Hg by atomic fluorescence spectrometry,while Pb by atomic absorption spectrometer. Results：The results show that：contents of As and Hg in cultivated and transplanted Anisodus tanguticus have a significant seasonal variation,while Cd does not.The contents of wild and transplanted Anisodus tanguticus have a positive correlation with each other.Conclusion：The contents of heavy metal elements are much different in the three habitats.With the development of city industry and transportation,due to the pollution,heavy metal elements which are accumulated in the soil will certainly go more into the roots of cultivated plants than the other two.Meanwhile,with higher elevation,contents of all kinds of heavy metal elements decrease.