城市道路植物圆柏叶片重金属含量及其与滞尘的关系

为研究植物叶片重金属含量与滞尘之间的关系，对青岛市区道路绿化树种——圆柏（Sabinachinensis）叶片中Pb、zn、Cu、Cd4种重金属含量及其滞尘特征进行了系统分析，并在此基础上探讨了两者之间的关系。结果表明：不同距离和高度处的叶片Pb、Zn含量差异显著，与距离和高度呈负相关关系；叶片Cu含量与高度负相关，与距离相关性不显著；Cd含量则与距离和高度均没有显著相关关系。距离和高度对滞尘量有显著影响，而两者的交互作用对滞尘量的影响不显著，随着距离和高度的增加滞尘量逐渐减少。叶面尘中Pb、Zn含量空间分布差异较大，而Cu、Cd含量分布差异不显著。叶片重金属含量与相对应的叶面尘重金属含量之间具有显著正相关关系，除Cd以外叶片重金属含量与滞尘量之间也表现出不同程度的正相关关系。

Contents of heavy metal and its relationship with dust detainition in leaves of Sabina chinensis in urban road

In order to study the relationship between contents of heavy metal in plant leaves and dust detaining, contents of heavy metals（Pb, Zn, Cu and Cd） in leaves of urban road growing tree species-Sabina （Sabina chinensis） in Qingdao and dust characteris- tics were systematically analyzed. The results showed that significant differences of the contents of Pb and Zn in leaves of different distance and height were observed. The contents of Pb and Zn in plant leaves were negatively correlated with distance and height. The content of Cu in leaves was negatively correlated with height, while no significant correlation was observed for Cu content and distance. There were also no obvious correlation between Cd content and distance or height. Distance and height had significant in- fluences on adsorbing dust quantity. However, there was no significant interaction between them. Dust quantity decreased gradually with the increasing of distance and height. The differences of contents of Pb and Zn in foliar dust were significant, while Cu and Cd distributed equably. Significant correlation between contents of heavy metal in plant leaves and foliar dust was observed. The con- tents of heavy metals except Cd in plant leaves were positively correlated with adsorbing dust quantity.