Int J Phytoremediation. 2014;16(5):482-95. doi: 10.1080/15226514.2013.798616.
To investigate the phytoextraction potential of Populus alba L. var. pyramidalis Bunge for cadmium (Cd) contaminated calcareous soils, a concentration gradient experiment and a field sampling experiment (involving poplars of different ages) were conducted. The translocation factors for all experiments and treatments were greater than 1. The bioconcentration factor decreased from 2.37 to 0.25 with increasing soil Cd concentration in the concentration gradient experiment and generally decreased with stand age under field conditions. The Cd concentrations in P. pyramidalis organs decreased in the order of leaves > stems > roots. The shoot biomass production in the concentration gradient experiment was not significantly reduced with soil Cd concentrations up to or slightly over 50 mg kg(-1). The results show that the phytoextraction efficiency of P. pyramidalis depends on both the soil Cd concentration and the tree age. Populus pyramidalis is most suitable for remediation of slightly Cd contaminated calcareous soils through the combined harvest of stems and leaves under actual field conditions.
为了研究银白杨（Populus alba L. var. pyramidalis Bunge）对石灰性土壤中镉（Cd）的植物提取潜力，进行了浓度梯度实验和野外采样实验（涉及不同年龄的杨树）。所有实验和处理的迁移因子均大于 1。在浓度梯度实验中，随着土壤 Cd 浓度的增加，生物浓缩因子从 2.37 降低至 0.25，而在野外条件下，随着林龄的增加，生物浓缩因子通常会降低。在银白杨器官中，Cd 浓度的顺序为叶片＞茎＞根。在浓度梯度实验中，当土壤 Cd 浓度高达或略高于 50mg/kg 时，地上生物量的产生并没有明显减少。结果表明，银白杨的植物提取效率取决于土壤 Cd 浓度和树木年龄。在实际田间条件下，通过茎和叶的联合收获，银白杨最适合修复轻度 Cd 污染的石灰性土壤。
