Heavy metal content in urban. soils as an indicator of anthropogenic and natural influences on landscape of Karachi-A multivariate spatio-temporal analysis
Heavy metal content in urban. soils as an indicator of anthropogenic and natural influences on landscape of Karachi-A multivariate spatio-temporal analysis
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DOI：
10.1016/j.ecolind.2013.07.020
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发表时间：
2014-07-01
影响因子：
6.9
通讯作者：
Qureshi, Salman
中科院分区：
文献类型：
--
作者：
Karim, Zahida;Qureshi, Bilal Aslam;Qureshi, Salman
城市土壤受自然因素和人为因素的共同影响。因此，它们的影响，修正城市土壤中重金属的浓度。在这项研究中，选定的重金属，包括铜，锌，铅，铁和铬在城市土壤中的浓度进行了评估，在大城市的卡拉奇，巴基斯坦。金属浓度的变异性在不同的城市土地利用，并通过季节性干预措施被用作所涉及的因素的指标。为了进行空间分析，从30个不同的地点收集了土壤样本，这些地点属于大城市中占主导地位的6种不同的土地利用。对于时间调查，样品收集在前季风（PRM）和后季风（POM）的条件。结果表明，两个季节的平均浓度均为Fe >> Zn > Pb > Cu > Cr。降雨后，铅和铁的浓度增加，似乎是由于下沉的空中金属和搬迁的洪水径流。铜和锌的浓度下降，在POM季节可能是由于雨水稀释。Cu、Zn和Pb金属浓度的空间变化似乎是点源和机动车排放的结果。尽管铁在土壤中的平均浓度很高，但其表现出中等的空间变异（方差
Urban soil is influenced by both the natural and anthropogenic factors. Their impacts, therefore, amend the concentration of heavy metals in urban soils. In this study, the concentration of selected heavy metals including Cu, Zn, Pb, Fe and Cr in urban soils was assessed in the megacity of Karachi, Pakistan. Variability of metal concentration across distinct urban land uses, and through seasonal interventions was used as an indicator of the factors involved. For spatial analysis, soil samples were collected from 30 different locations, belonging to 6 distinct land uses dominant in the megacity. For temporal investigations, the samples were collected in both pre-monsoon (PRM) and post-monsoon (POM) conditions. The results revealed that the mean concentrations were in the order Fe >> Zn > Pb > Cu > Cr, in both the seasons. Increase in concentration of Pb and Fe, after rain, seems to be the result of sinking of aerial metal and relocation by flood runoffs. The concentration of Cu and Zn decreased in the POM season possibly due to dilution by rainwater. The spatial variation in the concentration of Cu, Zn and Pb metals seemed to be the result of point sources and vehicle emissions. Fe, despite of its very high average concentration in soil, shows moderate spatial variation (Variance