关键词: 海芋, 肾蕨, 蟛蜞菊, 镉, 富集能力

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