| 摘要: |
| 【目的】分析白茅对重金属Cu、Mn、Zn、Ni和Cd的吸收富集作用，探索受重金属污染的尾矿库区的生态修复方法。【方法】以陕西略阳米箭沟铁尾矿库区内的白茅为研究对象，野外采集白茅植株和相关土样，室内对样品重金属含量进行检测与分析。【结果】白茅植株不同部位对重金属Cu、Mn、Zn、Ni和Cd的吸收与分布表现出一定的差异。重金属Cu和Mn在白茅根部含量最高，分别达到70.27和125.19 mg/kg，叶部含量最低，分别为1.15和4.54 mg/kg；Zn和Ni在白茅茎部含量最高，分别为92.28和105.44 mg/kg，而在根部含量最低，分别为12.76和22.16 mg/kg；Cd在茎部含量最高，为86.32 μg/kg，叶部含量最低，仅为29.18 μg/kg。白茅对不同重金属总富集系数的大小顺序为Zn>Cu>Ni>Mn>Cd，对各重金属转移能力的大小顺序Zn>Ni>Cd>Mn>Cu。【结论】白茅对Cu、Mn、Zn、Ni和Cd 5种金属的富集能力不强，但可在贫瘠的铁尾矿砂中生长而不受这些重金属的影响，并能改变尾砂的土壤理化性质，因此白茅可用于重金属污染尾矿库区的生态修复，尤其是Mn、Ni和Cd含量较高的矿区。 |
| 关键词: 铁尾矿 白茅 重金属吸收 富集系数 生态修复 |
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| 基金项目:国家重点研发计划项目“不同类型退化植被恢复重建技术”（2017YFC0504504）；陕西省科技厅自然科学基础研究计划项目（2018JM4058）;陕西省教育厅专项科研计划项目（17JK0159）；陕西理工大学人才引进科研项目（SLGQ2017-16） |
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| Absorption and accumulation of heavy metals by Imperata cylindrical in iron tailings |
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SONG Fengmin,ZHANG Xingchang,LIU Jin,et al
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| Abstract: |
| 【Objective】This study investigated the enrichment and distribution of heavy metals including Cu,Mn,Zn,Ni and Cd in root,stem and leaves of Imperata cylindrical to improve ecological restoration of heavy metal pollution in tailing areas.【Method】I.cylindrical settled naturally in Mijiangou iron tailings in Lueyang,Shaanxi was selected and I.cylindrica and soil samples were collected in field before contents of heavy metals were measured.【Result】Different organs of I.cylindrical absorbed Cu,Mn,Zn,Ni and Cd in different ways and these metals were distributed in different parts with different contents.Cu and Mn had the highest contents of 70.27 and 125.19 mg/kg in root,and the lowest contents of 1.15 and 4.54 mg/kg in leaves.Zn and Ni contents in stem were the highest of 92.28 and 105.44 mg/kg,and the lowest of 12.76 and 22.16 mg/kg in root,respectively.Highest Cd content of 86.32 μg/kg was in stem,and lowest of 29.18 μg/kg was in leaves.The accumulation coefficient was in the order of Zn>Cu>Ni>Mn>Cd,while the transfer ability was in the order of Zn>Ni>Cd>Mn>Cu.【Conclusion】The enrichment capability of for Cu,Mn,Zn,Cd and Ni by I.cylindrical was not strong,but it could grow in poor tailing soil and change physical and chemical properties of the iron tailings.Therefore,I.cylindrical could be used to remediate metal tailings contaminated by heavy metals,especially for areas with high Mn,Cd and Ni pollution. |
| Key words: iron tailings Imperata cylindrica heavy metals absorption concentration coefficient ecological restoration |
