Abstract: With three ornamental plants (Alocasia macrorrhiza, Nephrolepis cordifolia and Wedelia chinensis) as materials in pot-cultured experiment, their accumulation characteristics on Cadmium(Cd) in soil were studied. The results showed that three plants have different accumulation ability to Cd. The concentration of Cd in aboveground part and underground part had significant positive correlation with the content of Cd in soil (r＞0.9). The aboveground part of Wedelia chinensis had the strongest capability of accumulating Cd, with Alocasia macrorrhiza was secondly and Nephrolepis cordifolia was the weakest. Relatively, for their underground part, Alocasia macrorrhiza had the biggest content of Cd, Nephrolepis cordifolia secondly and Wedelia chinensis the lowest. When the content of Cd in soil came within 0～120 mg/kg, the roots accumulation coefficients of three plants were all greater than 1, which explained that their roots had the accumulation ability to Cd. Only Wedelia chinensis, whose accumulation coefficients of aboveground part and underground part were both above and beyond than 1, had the accumulation coefficient characteristics of over-accumulated plant. Therefore, Wedelia chinensis had some applied potential to soil restoration polluted by heavy metals Cd.

Key words: Alocasia macrorrhiza, Nephrlepis cordifolia, Wedelia chinensis, cadmium, accumulation ability

摘要： 以3种观赏植物海芋、肾蕨和蟛蜞菊为试材进行盆栽试验，研究其对土壤重金属镉的富集特征。结果表明：3种观赏植物对镉有不同的富集能力，其地上部和地下部富集的镉与土壤的镉含量呈显著正相关（r＞0.9）。蟛蜞菊地上部吸收富集能力最大，其次是海芋，肾蕨最弱；而海芋地下部镉含量最高，其次是肾蕨，蟛蜞菊最少。当土壤镉含量在0～120 mg/kg范围内，三种观赏植物根的富集系数都大于1，说明3种观赏植物根系对镉具有富集能力。3种植物中只有蟛蜞菊地上部和地下部的富集系数都大于1，说明其具有超积累植物的富集系数特征。因此，蟛蜞菊对重金属镉污染的土壤修复有一定的应用潜力。

关键词: 海芋, 肾蕨, 蟛蜞菊, 镉, 富集能力