水葱对镉的超富集作用及其用于植物修复的潜力

野外观察与研究发现水葱(Scirpus tabernaemontani G.)可以耐受土壤中高浓度的重金属污染,并对镉有很高的生物富集量。实验室水培试验研究了两个主要因素,营养液pH值以及镉含量,对其生物量以及镉富集效果的影响。结果表明,水葱可耐受的高浓度Cd(30mg/L)和大范围pH值变化(3.7～7.7)。当营养液pH值为4.7,Cd含量为25mg/L时,水葱富集的Cd达到最大值:地上部分264.71mg/kg,地下部分234·39mg/kg,平均转运系数1.13。这显示了它用于植物修复镉污染土壤的巨大潜力。

The hyperaccumulating of Scirpus tabernaemontani to Cd and its potential for phytoremediation

Cadmium phytoextraction can be economically feasible only when the developed systems high biomass plant can accumulate greater than 100 mg/kg Cd on dry weight. In this experiment,Scirpus tabernaemontani,a perennial herb,was used to demonstrate its capability at accumulating Cd,more than 280 mg/kg Cd in its above-ground parts. This hydroponics experiment showed the effects of two factors,solution pH and medium Cd concentration,on the plant biomass growth and Cd-extraction in 30 days. The herb could bear high level of Cd (30 mg/L) and widespread pH value shifting. The highest Cd-extractions are 264.71 mg/kg (above-ground parts) and 234.39 mg/kg (underground parts),with the average translation coefficient 1.13. It demonstrated the potential of this herb for phytoremediation.