利用芦竹修复重金属污染湿地的研究

A research on restoring wetland polluted by some heavy metals using giantreed

研究了芦竹(Arundodonaxlinn)对Cu2+、Ni2+、Cr6+重金属污染湿地的响应和对该污染湿地的影响。实验结果表明,芦竹对这3种重金属离子有一定的耐受性,并有不同程度的吸收,Cu2+、Ni2+和Cr6+去除率分别为63.8%,42.3%和34.4%。芦竹在100mg/kg浓度的Cu2+、Ni2+污染湿地中生长正常,在低浓度(55mg/kg)Cr6+污染中能存活,但生长速度较慢。在100mg/kg浓度Cr6+污染湿地中,出现急性中毒现象,半月后致死。在重金属污染环境中,芦竹普遍出现失绿现象,但除高浓度Cr6+(100mg/kg)以外,都能正常存活,表现出较强的适应性。

The responds of giantreed （Arundo donax linn） to the wetland polluted by some heavy metals, such as chromium, copper, nickel have been studied. The effect of giantreed on the polluted wetland has been also studied. The experimental results show that giantreed has good tolerance and can absorb the heavy metals mentioned above in various degrees. The Cu^2＋ ,Ni^2＋ and Cr^6＋ removal rates are 63.8%, 42.3% and 34.4% respectively. Giantreed grows normally in wetland contaminated by Cu^2＋ and Ni^2＋ with the concentration of 100 mg/kg and can live at low Cr^6＋ concentration （55 mg/kg） but its growth speed has been slowed. Giantreed shows acute poisoning in wetland contaminated by Cr^6＋ with the concentration of 100 mg/kg and could die in two weeks. Giantreed has the green-losing phenomenon in different degrees in the environment polluted by heavy metal ions. The giantreed could live normally except chromium （100 mg/kg） of higher concentration, and it shows better adaptability.