银叶真藓(Bryum argenteum)监测黔滇高速公路重金属污染的研究

Bryum argenteum as Bio-monitors for Heavy Metal Pollution along Qian-Dian Highway

通过采集G60高速公路贵阳—昆明段自然分布的银叶真藓(Bryum argenteum),监测其中Zn、Cd、Cu、Cr和Pb的含量,并采用污染因子和主成分分析方法研究重金属污染程度及来源。结果表明:研究路段银叶真藓中的重金属含量由高到低依次为Zn> Cu> Cr> Pb> Cd,Zn和Cu质量比平均值分别为1 060 mg/kg和102 mg/kg,明显高于对照点。主成分分析表明,重金属Zn、Cu、Pb和Cd可能来源于交通污染,而Cr来源于其他污染源。污染因子分析表明,重金属Zn污染最严重,Cu总体属于重度污染,Cr和Cd属于中度污染,Pb总体污染较低。

In this paper,Bryum argenteum was collected along Guiyang-Kunming highway for determination of Zn,Cd,Cu,Cr and Pb,the pollution level and the sources of these heavy metals were researched by using CF and PCA methods. The results showed that the mass ratios of these heavy metals were Zn > Cu > Cr > Pb > Cd.The average mass ratio of Zn and Cu were 1 060 mg/kg and 102 mg/kg,which were significantly higher than that in the contrast point. According to PCA,Zn,Cu,Pb and Cd might be from the transportation pollution and Cr was from other sources. Results from CF value showed that Zn pollution was the highest,Cu pollution was serious,Cr and Cd pollution were moderate,and Pb pollution was low in general.