| 郭朝晖,涂卫佳,彭驰,黄博,肖细元,薛清华.典型铅锌矿区河流沿岸农田土壤重金属分布特征及潜在生态风险评价[J].农业环境科学学报,2017,36(10):2029-2038. |
| 典型铅锌矿区河流沿岸农田土壤重金属分布特征及潜在生态风险评价 |
| Distribution characteristics and potential ecological risk assessment of heavy metals in paddy soil along both sides of river from typical lead/zinc mine area |
| 投稿时间：2017-03-17 |
| DOI：10.11654/jaes.2017-0386 |
| 中文关键词: 铅锌矿区 新墙河 农田土壤 镉 空间分布 潜在生态风险评价 |
| 英文关键词: Pb-Zn mine area Xinqiang River paddy soil cadmium spatial distribution potential ecological risk assessment |
| 基金项目:国家科技支撑计划课题（2015BAD05B02） |
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| 中文摘要: |
| 以原桃林铅锌矿区下游新墙河为例，依据河水灌溉特征，开展了河流沿岸农田土壤中重金属污染调查研究。应用内梅罗综合污染指数、地积累指数分析了农田土壤中重金属的污染与分布特征，利用相关性分析和聚类分析研究了重金属的主要来源，利用Hakanson潜在生态风险指数评估了重金属的潜在生态风险。研究结果表明，新墙河沿岸农田土壤中存在以Cd为主，As、Cu、Ni、Pb、Zn共存的多种重金属污染，主要集中在距离原桃林铅锌矿3 km范围内，呈现明显的点源污染分布特征。沿水流方向，农田土壤中重金属污染程度总体呈现下降趋势。距离矿区3 km范围内农田土壤中As、Cu和Pb，3~15 km范围内Cd、Ni和Zn含量仍处于《土壤环境质量标准（GB 15618-1995）》二级标准临界值水平；15~30 km范围内As、Cd、Cu、Ni、Pb和Zn含量基本在二级标准临界值以下；而在距离矿区30~50 km范围内河流沿岸农田土壤中只存在轻微的Cd污染。新墙河沿岸50%以上的农田土壤样品中Cd的生态风险系数达中等及以上；沿水流方向，距离矿区约6 km范围内灌溉水覆盖区的农田土壤中重金属潜在生态风险较高，需要优先防控。 |
| 英文摘要: |
| Through a field investigation, the pollution of heavy metals in paddy soil from irrigation along both sides of Xinqiang River, which was downstream of an abandoned Taolin Pb-Zn mine, was studied. The pollution and distribution characteristics of heavy metals in paddy soil were evaluated using both the Nemero comprehensive index and a geo-accumulation index. The source of heavy metals was analyzed by relative analysis and hierarchical cluster analysis, and the potential ecological risk of heavy metals was assessed by a Hakanson potential ecological risk index. The results showed that the pollution of paddy soil mainly existed in Cd associated with multi-elements of As, Cu, Ni, Pb, and Zn together. The pollution of heavy metals distributed mainly within 3 km from the abandoned mine, and the point source pollution characteristics, are significant. Generally, the trends of heavy metal concentrations in paddy soil decreased following the flow direction of Xinqiang River. The spatial distribution characteristics of As, Cu, and Pb in paddy soil within 3 km of the abandoned mine, and that of Cd, Ni, and Zn ranging from 3~15 km of the paddy soil reached the Grade-Ⅱ Level of the Soil Environmental Quality Standard of China (GB15618-1995). The content of As, Cd, Cu, Ni, Pb, and Zn ranging from 15~30 km of paddy soil from the abandoned mine were below the Grade-Ⅱ level. That of Cd in paddy soil ranging from 30~50 km from the abandoned mine, however, was lightly excessed. Cadmium in over 50% of the paddy soils from both sides of the Xinqiang River had moderate or higher potential ecological risk. Along the flow direction of the Xinqiang River, the irrigated paddy soils located within 6 km of the abandoned mine exhibited a relatively high potential ecological risk, suggesting that prior control strategies should be taken. |
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