Identification of traffic-related metals and the effects of different environments on their enrichment in roadside soils along the Qinghai-Tibet highway
Identification of traffic-related metals and the effects of different environments on their enrichment in roadside soils along the Qinghai-Tibet highway
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DOI：
10.1016/j.scitotenv.2015.03.054
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发表时间：
2015-07-15
影响因子：
9.8
通讯作者：
Li, Lanhui
中科院分区：
文献类型：
--
作者：
Zhang, Hua;Wang, Zhaofeng;Li, Lanhui
道路运输会对路边土壤环境产生不利影响，包括重金属富集。为识别和评价青藏高原道路交通造成的重金属富集情况，本研究对青藏公路沿线4个站点表土（0~10 cm深度）中V、Cr、Co、Ni、Cu、Zn、As、Cd、Rb、Pb、Tl等11种重金属进行了分析。我们的研究结果表明，Cr、Cu、Zn、As、Cd 和 Pb 等重金属与道路运输有关。路边土壤中大多数重金属的含量随着距道路的距离呈指数下降，一些内梅罗综合指数（PN 值）也是如此。交通相关金属的污染系数范围为0.56（无污染）至5.67（严重污染），这些重金属的内梅罗综合指数范围为0.80（无污染）至4.49（严重污染）。镉是优先关注的问题，因为它的污染系数最高。这些与交通相关的重金属的最高 PN 值是在 TTH（高山草原）地点的土壤中发现的。虽然交通导致路边环境中这些与交通相关的金属含量较高，但风和地形等区域差异也与其在路边土壤中的富集有显着关系。应根据青藏公路不同的自然环境，科学确定青藏公路沿线对牲畜和野生动物存在土壤重金属污染潜在风险的路边距离。 (C) 2015 Elsevier B.V. 保留所有权利。
The road transportation could affect roadside soils environment detrimentally, including heavy metal enrichment. In order to identify and evaluate the enrichment of heavy metals resulted from road transportation on the Tibetan Plateau, the 11 heavy metals (V, Cr, Co, Ni, Cu, Zn, As, Cd, Rb, Pb and Tl) in the topsoil (0-10 cm depth) from four sites along the Qinghai-Tibet highway were discussed in this study. Our results indicate that heavy metals such as Cr, Cu, Zn, As, Cd and Pb are related to road transportation. The content of most of these heavy metals in roadside soils decreased exponentially with the distance from the road, as did some of the Nemero Synthesis Indexes (PN values). The contamination factor for the traffic-related metals ranged from 0.56 (no pollution) to 5.67 (considerable pollution) and the Nemero Synthesis Indexes of these heavy metals ranged from 0.80 (no pollution) to 4.49 (severe pollution). Cd was of priority concern as it had the highest contamination factor. The highest PN value for these traffic-related heavy metals was found in soils at site TTH (alpine steppe). Although transportation contributed to the high contents of these traffic-related metals in roadside environments, regional differences such as wind and the terrain also had significant relationship with their enrichment in these roadside soils. The roadside distance at which there is a potential risk to livestock and wildlife from the contamination of soils by heavy metals should be determined scientifically along the Qinghai-Tibet highway, based on the different natural environments found in the region. (C) 2015 Elsevier B.V. All rights reserved.