| Cite this article: | 滑小赞,程 滨,赵瑞芬,等.太原市农田土壤重金属污染评价与空间分布特征[J].灌溉排水学报,0,():-. |
| HUA Xiao-zan,CHENG Bin,ZHAO Rui-fen,et al.太原市农田土壤重金属污染评价与空间分布特征[J].灌溉排水学报,0,():-. |
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| Pollution assessment and spatial distribution of heavy metals in the farmland soils of Taiyuan city |
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HUA Xiao-zan, CHENG Bin, ZHAO Rui-fen, HUO Xiao-lan, WANG Zhao, WANG Sen
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College of Resources and Environment,Shanxi Agricultural University
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| Abstract: |
| 【Objective】 The objective of present study was to describe the present situation, pollution sources and spatial distributions of heavy metals in the farmland soil of Taiyuan. This work will be helpful for pollution control and agricultural production. 【Method】 The concentrations of Cr, Cd, Pb, Hg and As in the 214 farmland soils in Taiyuan were determined. The pollution level of soil heavy metal elements was evaluated using single factor index method and nemerow comprehensive index method. The spatial distribution map of heavy metals was drew using ArcGIS 10.3 and the correlation analysis was done by SPSS 16.0 to reveal the pollution sources of heavy metals in soils. 【Result】① The concentrations distribution of heavy metals in farmland soils was quite different. The average content of Cr, Cd, As, Hg and Pb in soil was 68.38, 0.121, 8.59, 0.08 and 24.23 mg?kg-1 respectively. These contents were significantly higher than the corresponding background values of soil in Taiyuan, although they did not exceed the environmental quality standard of the green food producing area. ② The Single Pollution Index was shown as Hg(2.36)>Pb(1.76)>Cd(1.57)>Cr(1.19)>As(1.12). The contaminations of Hg, Pb and Cd mainly originated from industrial production, sewage irrigation, coal burning, application of pesticide and chemical fertilizer and transportation. On the other hand, the pollution of As and Cr were mainly associated with soil parent material and agricultural activities. ③ The Nemerow index of Taiyuan farmland soil was 2.14, indicating the moderate pollution. The Nemerow index of farmland soil was 4.17 in Jinyuan district, 2.98 in Xiaodian district, 2.13 in Jiancaoping district, 2.07 in Qingxu county, 1.71 in Yangqu county, 1.67 in Loufan county and 1.57 in Gujiao county. According to the Nemerow index (higher values, higher pollution), Jinyuan, Xiaodian, Jiancaoping and Qingxu were heavily polluted, while Gujiao, Yangqu and Loufan were slightly polluted. The main pollution elements were Hg and Pb across the 7 sampling counties. ④ The spatial distribution map of heavy metals and pollution status could be visualized, showing moderately and severely polluted in the suburb soils of Taiyuan (especially in Jinyuan and Xiaodian districts), and slightly polluted in the countries far from Taiyuan. 【Conclution】 We conclude that the farmland soils in Taiyuan were moderately polluted and Hg and Pb were the main contaminants. The more serious heavy metal pollution was located in the suburbs of Taiyuan (i.e., Jinyuan, Xiaodian, Jiancaoping and Qingxu). We recommend that it is necessary to strengthen monitoring Hg and Pb in soils in these heavily polluted areas to ensure the soil health and agriculture sustainability. |
| Key words: Taiyuan; arable land soil; heavy metals; pollution envaluation; spatial distribution |
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