College of Resources and Environment, Sichuan Agricultural University, 46 Xinkang Road, Yaan 625014, PR China.
J Hazard Mater. 2010 Jan 15;173(1-3):705-9. doi: 10.1016/j.jhazmat.2009.08.142. Epub 2009 Sep 4.
Screening hyperaccumulators and accumulators is a key step in the phytoremediation of soils contaminated by heavy metals. A pot experiment was conducted involving a soil Cd concentration gradient (0, 50, 75, 100, 125, 150, 175, and 200 mg kg(-1)) to determine if Malva sinensis Cavan. from two lead-zinc mines in Kangding and Yajiang in western Sichuan, China, is a Cd-hyperaccumulator. The highest Cd concentrations in plant shoots from Kangding and Yajiang were 154.30 and 122.77 mg kg(-1), respectively, at a soil Cd concentration of 200 mg kg(-1). The largest amounts of accumulation in plant shoots from Kangding and Yajiang were 700.5 and 1403.2 microg pot(-1), respectively. The bioconcentration factors in shoots were 0.53-1.03 for Kangding and 0.69-1.25 for Yajiang. Moreover, all translocation factors of plants from the two sites were over 1.0. Therefore, M. sinensis can be classified as a Cd-accumulator or non-standard Cd-hyperaccumulator.
筛选超积累植物和积累植物是重金属污染土壤植物修复的关键步骤。本研究采用盆栽试验，设置了镉浓度为 0、50、75、100、125、150、175 和 200mg/kg 的土壤镉浓度梯度，以研究来自四川康定和雅江两座铅锌矿的野葵（Malva sinensis Cavan.）是否为镉超积累植物。当土壤镉浓度为 200mg/kg 时，来自康定和雅江的野葵地上部镉含量最高，分别为 154.30 和 122.77mg/kg。来自康定和雅江的野葵地上部镉的最大积累量分别为 700.5 和 1403.2μg/盆。康定和雅江野葵地上部的生物浓缩系数分别为 0.53-1.03 和 0.69-1.25。此外，两个地点的植物所有转运系数均大于 1.0。因此，野葵可以被归类为镉积累植物或非标准镉超积累植物。
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