Yang Pingguo, Ge Jing, Yang Miao
College of Life Sciences, Shanxi Normal University, Linfen, 041000, China.
College of Arts and Sciences, Shanxi Agricultural University, Taigu, 030800, China.
Bull Environ Contam Toxicol. 2017 Jun;98(6):837-844. doi: 10.1007/s00128-017-2075-9. Epub 2017 Apr 3.
The study integrates surface and vertical distribution of magnetic susceptibility and heavy metal contents (Pb, Cu, Zn and Fe) to characterize the signature of vehicle pollutants in roadside soils at Linfen city, China. Sites with reforestation and without vegetation cover were investigated. The results showed that magnetic susceptibility and heavy metal contents were higher at the roadside without trees than in the reforest belt. The variations of magnetic susceptibility and heavy metal contents decreased both with distance and with depth. The maximum value was observed at 5-10 m away from the roadside edge. The vertical distribution in soil revealed accumulation of pollutants in 0-5 cm topsoils. The average contents were higher than the background values and in the order Fe (107.21 g kg), Zn (99.72 mg kg), Pb (90.99 mg kg), Cu (36.14 mg kg). Coarse multi domain grains were identified as the dominating magnetic particles. Multivariate statistical and SEM/EDX analyses suggested that the heavy metals derived from traffic sources. Trees act as efficient receptors and green barrier, which can reduce vehicle derived pollution.
该研究综合了磁化率和重金属含量（铅、铜、锌和铁）的地表及垂直分布情况，以表征中国临汾市路边土壤中车辆污染物的特征。对有重新造林和无植被覆盖的地点进行了调查。结果表明，无树的路边土壤的磁化率和重金属含量高于重新造林带。磁化率和重金属含量的变化随距离和深度的增加而减小。最大值出现在距路边边缘5至10米处。土壤中的垂直分布表明，污染物在0至5厘米的表层土壤中积累。平均含量高于背景值，顺序为铁（107.21克/千克）、锌（99.72毫克/千克）、铅（90.99毫克/千克）、铜（36.14毫克/千克）。粗多畴颗粒被确定为主要的磁性颗粒。多变量统计分析和扫描电子显微镜/能谱分析表明，重金属来源于交通污染源。树木是有效的污染物受体和绿色屏障，能够减少车辆产生的污染。
