| 龙岗河不同湿地植物重金属富集能力的比较研究 |
| Comparison of Heavy Metal Bioconcentration in the Wetland Plant Species of Longgang River |
| 投稿时间：2014-02-24 修订日期：2014-06-05 |
| DOI： |
| 中文关键词:重金属 富集系数 转移系数 龙岗河 |
| 英文关键词:heavy metals bioconcentration factors translocation factors Longgang River |
| 基金项目:深圳职业技术学院深圳市工业节水及城市污水资源化技术重点实验室2012年度开放课题。 |
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| 中文摘要: |
| 重金属污染是我国面临的重要环境问题之一，利用植物修复受污染的区域具有经济有效、操作简便等优点。选取龙岗河上游爱联嶂背工业区附近优势物种光头稗(Echinochloa colonum)、鬼针草 (Bidens pilosa) 以及绵毛酸模叶蓼 (Polygonum lapathifolium var. salicifolium) 作为研究材料，测定土壤及植物不同组分间Cd、Pb、Zn、Cu、Cr、As、Ni 的含量，比较不同植物间以及同一植物不同组分间重金属含量的差异，计算重金属的转移和富集系数，以分析深圳河支流附近植物重金属富集能力。结果表明，3种植株对7种重金属均有一定的吸附作用，其吸附能力依次是：Cd > As > Pb > Ni > Cr > Zn > Cu。3个物种对镉(Cd) 和砷 (As) 的吸附作用最大，达到《地表水环境质量标准》中V类水标准的2900倍和2800倍。物种间吸附能力比较结果表明，不同物种整株对重金属吸附的差异不明显，但组分间吸附数据表明，根是3个物种吸附重金属的关键区域。对富集与转移系数的研究可见，3种优势物种对Cd、Pb、Ni的富集系数均大于1，表明该区域优势物种对Cd, Pb, Ni的富集能力较强。龙岗河上游湿生优势物种对重金属有较强的吸附能力，可以维护和适当扩大其种群规模以利于该区域的重金属防治。 |
| 英文摘要: |
| Because of the influence of industrialization and urbanization, heavy metal pollution is one of the important environmental issues of Shenzhen City. The Ailianzhangbei industrial district of Shenzhen City, located on the upper reach of the Longgang River, is facing acute heavy metal pollution and is directly affecting the pollution level of the lower Longgang River, the Sham Chun River and other urban rivers of Shenzhen City. Phytoremediation in the contaminated areas is simple and inexpensive. In this study, heavy metal bioconcentration in different aquatic plants was compared for use in phytoremediation. Three species, Echinochloa colonum, Bidens pilosa and Polygonum lapathifolium var. salicifolium, dominated the three sample sites in the upper reach of Longgang River (Ailianzhangbei industrial district) and were selected for testing. The content of Cd, Pb, Zn, Cu, Cr, and Ni in these species and the soils they are rooted in were determined by inductively coupled plasma emission spectrometry (ICP- AES) and As was determined by hydride generation atomic absorption spectrophotometry (HG-AAS). Heavy metal content was compared among the plant species and in different plant tissues (roots, stems, leaves and flowers). The translocation factor and bioconcentration factor of each heavy metals was calculated and used to assess the potential bioaccumulation in plant species along tributaries of the Sham Chun River. Results indicate heavy metal accumulation in these species was Cd > As > Pb > Ni > Cr > Zn > Cu. The three species all displayed higher sorption capacity for Cd and As and the levels observed were 2900 times and 2800 times higher than the Class V water standards listed in “Surface Water Quality Standards”. The comparison of sorption ability among species showed little or no differences in the heavy metal accumulation but there were obvious differences among different plant tissues with the highest metal accumulation in the roots. The bioconcentration factors of all three species to Cd, Pb, Ni were > 1, indicating high bioconcentration of the three elements. Overall, the dominant plant species in the upper reach of the Longgang River effectively accumulate heavy metals and increasing the population levels of these species will help control the heavy metal pollution in this region. |
| 万涛,李绍峰,谢良生.2014.龙岗河不同湿地植物重金属富集能力的比较研究[J].水生态学杂志,35(5):96-100. |
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