水生态学杂志Issue(5)：96-100,5.
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
摘要
Abstract
Because of the influence of industrialization and urbanization,heavy metal pollution is one of the impor-tant 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 Polygo-num lapathifolium var.salicifolium,dominated the three sample sites in the upper reach of Longgang River (Ail-ianzhangbei 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 po-tential bioaccumulation in plant species along tributaries of the Sham Chun River.Results indicate heavy metal ac-cumulation 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 2 900 times and 2 800 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 tis-sues 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 up-per 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.关键词
重金属/湿地植物/富集系数/转移系数/龙岗河Key words
heavy metals/wetland plant/bioconcentration factors/translocation factors/Longgang River分类
资源环境引用本文复制引用
万涛,李绍峰,谢良生..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,2014,(5):96-100,5.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。 （）
