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| 沘江流域耕地土壤重金属分布及生态风险评价 |
| Distribution and Ecological Risk Assessment of Heavy Metals in Arable Soils in Bijiang Watershed, China |
| 投稿时间：2017-05-01 |
| DOI：10.13254/j.jare.2017.0113 |
| 中文关键词: 生态风险，重金属，沘江流域，耕地土壤 |
| 英文关键词: ecological risk, heavy metal, Bijiang watershed, arable soil |
| 基金项目:云南省科技惠民计划"沘江流域农田土壤重金属污染修复关键技术研究及应用"（2014RA018）；云南省科技创新人才计划（2015HC018）；对外科技合作计划-院士专家工作站（2015IC022） |
| 作者 | 单位 | E-mail | | 黄维恒 | 云南农业大学资源与环境学院, 云南 昆明 650201
云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | | | 包立 | 云南农业大学资源与环境学院, 云南 昆明 650201
云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | | | 林健 | 云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | | | 熊荟菁 | 云南农业大学资源与环境学院, 云南 昆明 650201
云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | | | 邓洪 | 云南农业大学资源与环境学院, 云南 昆明 650201
云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | | | 张乃明 | 云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 | zhangnaiming@sina.com |
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| 中文摘要: |
| 地处兰坪铅锌矿下游的沘江流域土壤重金属污染问题倍受关注。本文在沘江流域采集了35个耕地土壤样品，分析测定了砷、铜、锌、镉、铅、汞6种重金属污染物累积量，并应用内梅罗综合污染指数法及Hacanson潜在生态风险指数法，对耕地土壤污染状况及生态风险进行评价。结果表明：（1）沘江流域沿岸耕地重金属铅、锌、镉累积量相对处于极高水平，均值分别为1 146.97、579.15、4.85 mg·kg-1，污染十分严重；砷的累积量也较大，均值为26.85 mg·kg-1；铜、汞累积量较小，污染程度轻；（2）地统计分析结果表明，兰坪周边流域是土壤重金属砷、锌、铅、镉污染的一个主要点源污染源，而铜、汞污染没有显著点源污染源，均来自不同面源污染；（3）流域内梅罗指数均值为17.69（远大于3），存在极其严重重金属污染，同时综合潜在生态风险指数均值为773.38，有很强潜在生态风险。污染物贡献表现为镉 > 铅 > 锌 > 砷 > 汞 > 铜；（4）沘江流域耕地土壤总体表现为水田重金属污染略高于旱地。 |
| 英文摘要: |
| It has been paid much attention to soil heavy metal pollution in the Bijiang watershed caused by the Lanping lead-zinc mine. We collected 35 arable soil samples along Bijiang, then sampled and tested the contents of As, Cu, Zn, Cd, Pb, Hg. And then with Nemerow Multi-Factor Index and the Potential Ecological Risk Index method, we evaluated the heavy metal pollution risk. The results showed:(1)The accumulation of Pb, Zn, Cd was in a relatively high level, the average was 1 146.97, 579.15, 4.85 mg·kg-1 respectively, which was seriously polluted; the average accumulation of As was 26.85 mg·kg-1; but Cu, Hg was slightly polluted. (2)Statistical analysis showed that Lanping area was a main point source pollution of As, Zn, Pb, Cd, while Cu, Hg was pollution caused by different non-point source pollution.(3)Within this basin, the Nemerow index was 17.69, which was serious heavy metal pollution, while the comprehensive potential ecological risk index was 773.38, which was a strong potential ecological risk. The contribution of pollutants was Cd > Pb > Zn> As> Hg > Cu. (4)As a whole, the soil heavy metal pollution of paddy field was higher than of the dry land. |
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