| 厌氧环境下美人蕉根表铁膜对重金属积累转运的影响 |
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| 引用本文： | 宋阳煜,吴娟,成水平.厌氧环境下美人蕉根表铁膜对重金属积累转运的影响[J].环境科学研究,2021,34(3):734-741. |
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| 作者姓名： | 宋阳煜 吴娟 成水平 |
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| 作者单位： | 江苏省城市规划设计研究院,江苏 南京 210009;同济大学,长江水环境教育部重点实验室,上海 200092 |
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| 基金项目： | 国家自然科学基金项目（No.51778455） |
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| 摘 要： | 根表铁膜作为污染物进入植物体内的门户，对植物修复重金属污染底泥起着重要作用.有机物降解消耗DO导致的底泥厌氧环境会显著影响根表铁膜的形成，并改变重金属的生物地球化学特征，从而影响重金属污染底泥的植物修复效果.为了探讨底泥厌氧环境中植物根表铁膜对重金属积累和转运的影响，采用向底泥中投加蔗糖模拟底泥厌氧条件的方法，测定不同底泥厌氧水平下挺水植物美人蕉（Canna indica）的生物量、根表铁膜和植物组织内重金属的含量.结果表明:①底泥厌氧环境不利于美人蕉对Cd、Cr、Cu、Ni、Pb和Zn的吸收，随着厌氧程度的增加，美人蕉对重金属的吸收量逐渐减少.②底泥厌氧环境能促进根表铁膜的形成及其对Cr和Ni的富集，重度厌氧环境中根表铁膜的含量为（10.40±0.30）g/kg（以根干质量计），但厌氧环境抑制了铁膜对Cd、Pb和Zn的富集.③底泥厌氧环境不利于Ni从根表铁膜转运至植物组织，但轻度厌氧环境能促进Cr和Zn从根表铁膜转运至根系，且底泥厌氧环境对Cd、Pb和Cu的迁移转运无显著影响.研究显示，底泥厌氧环境促进了植物根表铁膜的形成，根表铁膜对重金属积累和转运的影响因底泥厌氧水平和重金属元素种类不同而不同.
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| 关 键 词： | 底泥厌氧环境 植物修复重金属污染 美人蕉 铁膜 积累 转运 |
| 收稿时间： | 2020/3/24 0:00:00 |
| 修稿时间： | 2020/7/3 0:00:00 |
Effects of Iron Plaque on Heavy Metal Accumulation and Translocation by Canna indica in Anoxic Sediment |
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| SONG Yangyu,WU Juan,CHENG Shuiping.Effects of Iron Plaque on Heavy Metal Accumulation and Translocation by Canna indica in Anoxic Sediment[J].Research of Environmental Sciences,2021,34(3):734-741. |
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| Authors: | SONG Yangyu WU Juan CHENG Shuiping |
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| Affiliation: | 1.Jiangsu Institute of Urban Planning and Design, Nanjing 210009, China2.Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | As a gateway for pollutants to enter plant tissues, the iron plaque (IP) on root surface plays an important role in the phytoremediation of heavy metal contaminated sediment. The anoxic condition in the sediment caused by the degradation of organic matters significantly effects the formation of IP on root surface and change the biogeochemical processes of heavy metals, thereby affecting the phytoremediation of the heavy metal contaminated sediment. In order to explore the formation of IP on the root surface of emergent aquatic plants and its effect on the accumulation and translocation of heavy metals in anoxic sediment, sucrose was added into sediment to simulate sediment anoxia, and the biomass, IP content on root surface and metal content in the tissues of Canna indica were determined. The results indicated that: (1) The accumulation of metals in plant tissues decreased with the anoxic condition in the sediment. (2) The anoxic condition promoted the formation of IP on root surface and enrichment of Cr and Ni in IP. Under severe anoxic condition, the highest IP content was (10.40±0.30) g/kg of dry root, but the content of Cd, Pb and Zn in IP was reduced. (3) The anoxic condition inhibited the translocation of Ni from the IP to plant tissues, while slight anoxic condition promoted the translocation of Cr and Zn. The effect of anoxic condition on the translocation of Cd, Pb and Cu was not significant. The study shows that the anoxic condition in sediment promotes the formation of IP on root surface of emergent macrophytes and affects the accumulation and translocation of heavy metals via IP with different patterns depending on the anoxic levels and the metal species. |
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| Keywords: | anoxic condition in sediment phytoremediation of heavy metal contaminated sediment Canna indica iron plaque accumulation translocation |
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