| Cite this article: | 闫梦,王效举,程红艳,等.污灌区玉米地土壤重金属铜化学形态时空变化及风险评价[J].灌溉排水学报,,():-. |
| Yan Meng,WangXiaoju,Cheng Hongyan,et al.污灌区玉米地土壤重金属铜化学形态时空变化及风险评价[J].灌溉排水学报,,():-. |
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| Temporal and spatial variation and risk assessment of soil copper with plantation of maize in a sewage irrigation area |
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Yan Meng1, WangXiaoju2, Cheng Hongyan1, Chang Jianning1, Huang Fei1, Zhang Guosheng1, He Xiaofang1
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1.College of Resource and Environment,Shanxi Agricultural University,Taigu Shanxi;2.Center for Environmental Science in Saitama,Kazo city,Saitama -,Japan
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| Abstract: |
| 【Objective】To investigate the temporal and spatial changes of different chemical forms of copper in soils, and to provide scientific basis for the environmental and soil remediation of heavy metal contaminated farmland.【Method】Chemical speciation and risk assessment of heavy metal Cu in soils of different tillage layers (0-20 cm, 20-40 cm, 40-60 cm) and different areas were studied for four consecutive years from autumn 2016 to spring 2019 with plantation of Maize (Zea may L.) in a sewage irrigation district in Jinzhong City of Shanxi Province. Tessier continuous extraction method was used for analysis of Cu chemical speciation. 【Result】The content of Cu in soil exceeded the National Environment Quality Standard for Soil (GB 15618-2018). From the autumn of 2016 to the spring of 2019, in the 0 ~ 20cm soil layer, except for non-obvious changes in Fe-Mn oxides-bound fraction of Cu, the other forms showed a decreasing trend. In the soil layer of 20-40cm, the Carbonate-bound fraction decreased with time, the residual fraction did not change significantly, while the exchangeable fraction, Fe-Mn oxides-bound fraction and the Organic-bound fraction increased. In the soil layer of 40 ~ 60cm, except for the organic-bound fraction and residual fraction, the other forms showed an increasing trend. Environmental risk was assessed with secondary and primary facies distribution ratio method (RSP), and the results showed that heavy metal Cu in soil in the sewage irrigation areas constitutes a heavy environmental pollution level to the soil environment. 【Conclusion】Continuous maize plantation obviously reduced the environmental risk caused by Cu pollution in this sewage irrigation area, and contributed to remediation of contaminated soil to a certain extent. |
| Key words: Soil in Sewage Irrigation Area; Cu; Chemical forms; Risk assessment analysis; soil remediation |
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