铬铜镍在芦竹中的富集与分布

研究芦竹(Arundo donax Linn)在Cr、Cu、Ni污染湿地中的富集能力以及三种重金属在植株中的分布情况。结果表明:生长期8个月后,芦竹在20.4和55.0mg/kgCr污染湿地中,对Cr的富集量:根13.86mg/kg(DW)和15.29mg/kg(DW);茎1.37mg/kg(DW)和3.59 mg/kg(DW);叶6.37mg/kg(DW)和8.22mg/kg(DW)。在51.3和105mg/kgCu污染湿地中,对Cu的富集量:根35.6mg/kg(DW)和44.1mg/kg(DW);茎3.30mg/kg(DW)和4.14mg/kg(DW);叶6.75mg/kg(DW)和8.86mg/kg(DW)。在61.0和103.0mg/kgNi污染湿地中,对Ni的富集量:根20.37mg/kg(DW)和26.74mg/kg(DW);茎11.86mg/kg(DW)和13.03mg/kg(DW);叶12.2mg/kg(DW)和15.77mg/kg(DW)。三种金属在植株中的分布情况很相似,都是根>叶>茎,生物富集系数(Bioconcentration factor)均<1。可以认为芦竹对这三种重金属能富集,但不具备超富集植物的特征。

Accumulation and Distribution of Chromium, Copper and Nickel in Arundo donax Linn

The accumulation and distribution of Arundo donax Linn to wetlands polluted by Cr, Cu and Ni were studied. Results showed that after 8 months growth, in Cr6+ contaminated wetland with concentration of 20.4mg/kg and 55.0 mg/kg, the accumulation amount were 13.86 mg/kg and 15.29mg/kg at the plant root, 1.37 mg/kg and 3.59mg/kg at the plant stem, 6.37mg/kg and 8.22mg/kg at the leaf. In the wetland contaminated by Cu2+ ion with concentration of 51.3mg/kg and 105mg/kg, the accumulation amount were 35.6 mg/kg and 44.1mg/kg at its root, 3.30 mg/kg and 4.14mg/kg at its stem, 6.75 mg/kg and 8.86mg/kg at its leaf. In the wetland contaminated by Ni2+ ion with concentration of 61.0mg/kg and 103.0mg/kg, the accumulation amount were 20.37 mg/kg and 26.74mg/kg at its root, 11.86 mg/kg and 13.03mg/kg at its stem, 12.2mg/kg and 15.77mg/kg at its leaf. The accumulation effect of all was similar, with bio-concentration factor less than 1. Arundo donax Linn was concluded to accumulate heavy metals in wetlands, but wasn't a hyper-accumulation plant for Cr, Cu and Ni.