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OALib Journal期刊
ISSN: 2333-9721
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重金属镉超富集浮萍品种筛选及其对水体中镉的去除效果
DOI: 10.3724/SP.J.1145.2015.04023, PP. 830-836
Keywords: 浮萍,重金属镉,品种筛选,干物质积累率,富集系数
Abstract:
为筛选出能高效去除水体重金属镉，并能快速积累生物量的浮萍品种，对实验室保存的12个能耐受30mg/l镉浓度的浮萍品种在0.5mg/l和10mg/l的镉浓度下进行复筛，获得最优品种少根紫萍（landoltiapunctata）zh0049，并研究其在不同镉浓度胁迫下的生长状况和镉富集能力，同时分析其叶绿素含量变化与镉胁迫浓度的关系.结果显示：zh0049在0-0.5mg/l的镉浓度范围内能正常生长，干物质积累率最高可达到6.44gm-2d-1.在0-3mg/l的镉浓度范围内，zh0049对镉的吸收率、去除率以及富集系数在0.5mg/l时出现波谷，而在3mg/l时达到最高，分别为66.74%、72.43%和770.叶绿素相对含量实验结果显示，当镉浓度大于0.5mg/l，浮萍生长受到抑制，叶绿素a、b含量开始下降，相对于初始值最高下降了61.79%和32.08%.当镉浓度从0.5mg/l至3mg/l，叶绿素相对含量（chla/chlb）相对于初始值分别下降了3.49%、7.28%、19.32%、31.33%和42.59%，表明叶绿素a降幅大于叶绿素b.综上，zh0049能将水体中的镉富集在体内的同时，保持较高的干物质积累量，从而达到较好的重金属去除效果，为水体中镉的去除建立了一种新途径.
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