3种挺水植物对水体中Cu^(2+)富集能力的研究

Accumulation Capability of Cu^(2+) in Three Emergent Aquatic Plants

选取美人蕉、风车草和羽毛草3种挺水植物作为试验植物,模拟研究了3种植物对Cu^(2+)的耐受性以及不同pH条件对植物生长和植物对Cu^(2+)的富集情况。试验结果表明,3种挺水植物对Cu^(2+)浓度为2、4和6 mg/L均有较强的耐受能力。经过21 d试验后,3种植物对Cu^(2+)浓度为6 mg/L的富集量最大,其中,美人蕉对Cu^(2+)的富集量为208.562 mg/kg,风车草为332.453 mg/kg,羽毛草为201.373 mg/kg。美人蕉和羽毛草在p H为5的水体中对Cu^(2+)的富集量最大(234.636 mg/kg和168.957 mg/kg),而风车草在pH为7的水体中最大(246.652 mg/kg)。美人蕉和风车草植物根部对Cu^(2+)的富集能力远强于茎叶部,风车草比美人蕉的转移系数大,因而比美人蕉有利于Cu^(2+)的回收。

With Canna indica ,Cyperus alternifolius and Brazilian milfoil as the test plants ,to simulateand study the tolerance of plants to Cu2+ ,different pH conditions on plant growth and enrichments of Cu2+.The results showed that three kinds of emergent plants have a strong tolerance for Cu2+ concentrations of2、4 、6 mg/L. After 21 days test ,the Cu2+ enrichments of three kinds of plants were maximum in 6mg/L ,respectively were 208. 562 mg/kg (Canna indica),332. 453 mg/kg (Cyperus alternifolius) and201. 373 mg/kg(Brazilian milfoil). The Cu2 + enrichments of Canna indica and Brazilian milfoil weremaximum in water with pH = 5(234. 636 mg/kg and 168. 957 mg/kg),while Cyperus alternifolius wasmaximum at pH = 7(246. 652mg/kg),and the roots of Canna indica and Cyperus alternifolius on Cu2 +accumulation were far stronger than the stems and leaves,the transfer coefficient of Cyperus alternifoliuswas higher than Canna indica,thus Cyperus alternifolius is propitious to recover Cu2+.