| 刘芳枝,胡俊良,刘劲松,赵震乾,杨雪,张煜,罗朝晖.南岭泡金山矿产集采区土壤重金属空间分布及风险评价[J].农业环境科学学报,2018,37(1):86-95. |
| 南岭泡金山矿产集采区土壤重金属空间分布及风险评价 |
| Spatial distribution and risk assessment of heavy metals in soil in the metal mining area of Paojinshan, Hunan, China |
| 投稿时间：2017-08-20 |
| DOI：10.11654/jaes.2017-1136 |
| 中文关键词: 泡金山 土壤重金属 空间分布 风险评价 数理统计 |
| 英文关键词: Paojinshan soil heavy metals spatial distribution risk assessment statistics |
| 基金项目:中国地质调查局项目（DD20160334） |
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| 中文摘要: |
| 为探究典型多金属矿产集中开采区土壤重金属分布情况及其潜在风险，以南岭泡金山地区即湘南桥条江小流域矿采区为研究区，采集352个表层土壤样品，对Cr、Cd、Pb、Zn、Cu、Ni和As这7种重金属元素进行测试分析，综合运用数统和地统方法分析研究区整体及不同影响因素下土壤重金属的空间分布特征，并对其进行风险评价。结果表明，研究区表层土壤重金属均受到了不同程度的污染，矿区及其下游沿河地区污染严重，空间变异程度略高，复合污染、点源污染情况突出。土壤重金属含量基本随pH及有机质含量升高而升高；不同土地利用方式下土壤Cr、Ni、Cd含量变化不明显，草地、林地中Pb、Zn、Cu、As含量较高；不同地质背景条件下土壤重金属含量在成矿母岩（花岗岩体）、含矿围岩（D2s+h）及矿区中下游干流一级阶地（QxⅠ）含量较高。研究区Cd、Pb、As单元素潜在生态风险水平较高，整体处于低-中等潜在生态风险水平，但矿区及其周边、下游沿河地区潜在生态风险为高或极高等级，可能会对北江流域产生一定影响，应该引起警惕予以重视。 |
| 英文摘要: |
| Spatial distribution and potential risks of heavy metals in soil were studied in the Paojinshan mining area(Qiaotiaojiang River watershed), a typical multi-metal mining area of the Nanling metallogenic belt, Hunan, China. A total of 7 heavy metals, Cr, Cd, Pb, Zn, Cu, Ni, and As were tested and analyzed in 352 surface soil samples. Statistical analysis demonstrated that the surface soil in the study area was subject to different degrees of pollution by the seven heavy metals, with slightly higher spatial variability of the heavy metals, and complex pollution and point source pollution were prominent. The mining area and its downstream valley areas were characterized by high levels of pollution. Analysis of different factors affecting the distribution of soil heavy metals showed that the content of heavy metals in the soil increased with increasing pH and organic matter content. There was no obvious difference in the content of Cr, Ni, and Cd under different land use patterns; however, Pb, Zn, Cu, and As showed a tendency of higher concentrations in grassland and forest land. The geological condition was the other important factor, whereby high contents of heavy metals were found in the areas of mineralization mother rock(granite), ore-bearing strata(D2s+h), as well as the downstream terrace(QxⅠ) of the mining area. Potential ecological risk assessment by the Hakanson model showed that the potential ecological risk level was low-middle for the majority of heavy metals; however, the risk level was high for Cd, Pb, and As. The mining area and the Qiaotiaojiang River downstream had high or very high levels of potential ecological risk and more attention should be paid to controlling the effect of pollution on the Beijiang River basin. |
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