芦苇、菖蒲和水葱对水体中Zn^(2＋)的富集效应研究

Accumulation Effect of Phragmites australis, Acorus calamus and Scirpus tabernaemontani on Zn^(2+) in Water Body

采用水培方法,在不同ZnCl2浓度(0mg/L、50mg/L、100mg/L、300mg/L、800mg/L、1500mg/L和2500mg/L)处理的水体中,对湿地植物芦苇(Phragmites australis)、菖蒲(Acorus calamus)和水葱(Scirpus tabernaemontani)进行培养,研究植物的不同部位对Zn2+的积累能力。结果表明,在相同ZnCl2浓度处理下的水体中,水葱、菖蒲和芦苇体内的平均Zn2+积累浓度存在差异,菖蒲体内的Zn2+积累浓度最高。在不同ZnCl2浓度处理下的水体中,水葱体内的平均Zn2+积累浓度在ZnCl2浓度为1500mg/L时最高,为31050.84mg/kg(植物地上部分为10206.67mg/kg,地下部分为20844.17mg/kg);菖蒲和芦苇体内的平均Zn2+积累浓度则在ZnCl2浓度为2500mg/L时最高,分别为54130.67mg/kg(地上部分为16774.00mg/kg,地下部分为37356.67mg/kg)和25423.34mg/kg(地上部分为4506.67mg/kg,地下部分为20916.67mg/kg)。这3种植物都可以作为利用植物修复重金属污染水体的遴选物种。其中,菖蒲对Zn2+的吸收能力明显高于水葱和芦苇。

Zinc ion concentrations in different parts of three wetland plants Phragmites Australis, Acorus calamus and Scirpus tabernaemontani were measured after hydroponically cultured with different concentrations of treatment ZnCl2 solutions （0 mg/L, 50 mg/L, 100 mg/L, 300 mg/L, 800 mg/L, 1 500 mg/L and 2 500 mg/L）. The results showed that zinc ion concentrations in above-ground parts and under-ground parts of 3 kinds of wetland plants were differently in same concentration of treatment solution, highest in Acorus calamus. To the same plant with different concentration of ZnCl2 solutions, the highest zinc ion concentration was in 1 500mg/L and 2 500mg/L treatment solutions. The results indicated that 3 kinds of wetland plants can efficiently absorb zinc ion from the heavy metal water with different extents. As for Scirpus？tabernaemontani, the best removal efficiency appeared under 1 500 mg/L treatment solution, the highest removal effects were 31 050.84 mg/kg （10 206.67 mg/kg in above-ground parts and 20 844.17 mg/kg in under-ground parts）. For Acorus calamus and Phragmites australis, the highest accumulation concentrations of zinc ion were 54 130.67 mg/kg （16 774.00 mg/kg in above-ground parts and 37 356.67 mg/kg in under-ground parts） and 25 423.34 mg/kg （4 506.67 mg/kg in above-ground parts and 20 916.67 mg/kg in under-ground parts） under 2 500 mg/L ZnCl2 solutions respectively. The 3 kinds of wetland plants, especially Acorus calamus, could be suggested to be applied as phytoremediation species in heavy metal contaminated water body.