水葱对镉的超富集作用及其用于植物修复的潜力(英文)  

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

作　　者：李硕[1] 刘云国[1] 李永丽[1] 徐卫华[1] 李欣[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082

出　　处：《广西植物》2007年第2期180-185,共6页Guihaia

基　　金：湖南省自然科学基金(04JJ3013);国家发改委科学基金(2002BA516A15-12)~~

摘　　要：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。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.

关 键 词：地超富集植物 水葱 镉 植物修复 

分 类 号：Q945[生物学—植物学]