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青萍在Pb、Cu污染水体植物修复中的应用研究

Keywords: 青萍,Pb(Ⅱ),Cu(Ⅱ),污染,植物修复

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Abstract:

以青萍种浮萍(LemnaperpusillaTorr.)为实验材料,以Pb(Ⅱ)、Cu(Ⅱ)为染毒因子,设定金属离子浓度梯度(Pb(Ⅱ):0~40mg/L,Cu(Ⅱ):0~4mg/L),考察了在不同金属离子浓度下青萍生长状况、叶片色素含量以及金属离子浓度对青萍N、P和金属离子吸收能力的影响。结果表明:金属离子浓度的越高,青萍生长受抑制越严重;Cu(Ⅱ)对青萍的毒害大于Pb(Ⅱ);在Pb(Ⅱ)浓度为40mg/L,Cu(Ⅱ)浓度为4mg/L时,青萍对Pb(Ⅱ)和Cu(Ⅱ)的平均单位鲜重富集量分别为26.09mg/g和2.49mg/g,但同时,青萍的生长受到严重抑制,叶绿素含量急剧下降,且N、P从细胞中溶出。研究表明,青萍比较适宜修复被低浓度Pb(Ⅱ)污染的水体。

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