State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Lingyin Administration Department (Hangzhou Flower Garden), Hangzhou Park and Cultural Relic Administration, Hangzhou 310012, China.
Int J Environ Res Public Health. 2018 May 24;15(6):1064. doi: 10.3390/ijerph15061064.
Heavy metal contamination in roadside soil due to traffic emission has been recognized for a long time. However, seldom has been reported regarding identification of critical factors influencing the accumulation of heavy metals in urban roadside soils due to the frequent disturbances such as the repair of damaged roads and green belt maintanance. Heavy metals in the roadside soils of 45 roads in Xihu district, Hangzhou city were investigated. Results suggested the accumulation of Cu, Pb, Cd, Cr, and Zn in roadside soil was affected by human activity. However, only two sites had Pb and Zn excessing the standards for residential areas, respectively, according to Chinese Environmental Quality Standards for soils. The concentrations of Cu, Pb, Cd, and Zn were significantly and positively correlated to soil pH and organic matter. An insignificant correlation between the age of the roads or vegetation cover types and the concentration of heavy metals was found although they were reported closely relating to the accumulation of heavy metals in roadside soils of highways. The highest Pb, Cd, and Cr taking place in sites with heavy traffic and significant differences in the concentrations of Cu, Pb, Cd, and Zn among the different categories of roads suggested the contribution of traffic intensity. However, it was difficult to establish a quantitative relationship between traffic intensity and the concentrations of heavy metals in the roadside soil. It could be concluded that impaction of traffic emission on the accumulation of heavy metals in roadside soils in urban area was slight and soil properties such as pH and organic matters were critical factors influencing the retention of heavy metals in soils.
重金属污染在路边土壤由于交通排放已经被认识了很长一段时间。然而，很少有报道称由于频繁的干扰，如损坏道路的修复和绿化带的维护，识别影响城市路边土壤中重金属积累的关键因素。本研究调查了杭州市西湖区 45 条道路的路边土壤中的重金属。结果表明，人类活动影响了路边土壤中 Cu、Pb、Cd、Cr 和 Zn 的积累。然而，根据中国土壤环境质量标准，只有两个地点的 Pb 和 Zn 超过了居民区的标准。Cu、Pb、Cd 和 Zn 的浓度与土壤 pH 值和有机质呈显著正相关。尽管据报道，道路的年龄或植被覆盖类型与高速公路路边土壤中重金属的积累密切相关，但它们与重金属浓度之间没有发现显著的相关性。尽管据报道，道路的年龄或植被覆盖类型与高速公路路边土壤中重金属的积累密切相关，但它们与重金属浓度之间没有发现显著的相关性。尽管据报道，道路的年龄或植被覆盖类型与高速公路路边土壤中重金属的积累密切相关，但它们与重金属浓度之间没有发现显著的相关性。尽管据报道，道路的年龄或植被覆盖类型与高速公路路边土壤中重金属的积累密切相关，但它们与重金属浓度之间没有发现显著的相关性。尽管据报道，道路的年龄或植被覆盖类型与高速公路路边土壤中重金属的积累密切相关，但它们与重金属浓度之间没有发现显著的相关性。在交通流量大的地方发现了最高的 Pb、Cd 和 Cr，不同类型道路之间 Cu、Pb、Cd 和 Zn 的浓度存在显著差异，表明交通强度的贡献。然而，很难建立交通强度与路边土壤中重金属浓度之间的定量关系。可以得出结论，交通排放对城市地区路边土壤中重金属积累的影响较小，土壤性质如 pH 值和有机质是影响重金属在土壤中保留的关键因素。
