细叶百日草对镉的生长响应及富集特征研究

Effects of Cadmium on Growth Response and Accumulation Characteristics of Zinnia angustifolia( Z. linearis)

为探讨观赏绿化植物应用于植物修复技术的可行性,以细叶百日草(Zinnia angustifolia(Z.linearis))为试验材料,通过盆栽模拟试验,研究其在不同浓度镉处理下的生长响应和富集特征。结果表明,镉处理浓度≤60 mg·kg-1时对细叶百日草的生长有一定的促进作用,表现为植株生物量的显著增加,当镉处理浓度达到120 mg·kg-1时,植株生物量有所降低,但是与对照无显著差异。细叶百日草各器官中镉含量表现为根>茎>叶>花的分布格局,且随着镉处理浓度的增加均逐渐增加,在镉处理浓度为120 mg·kg-1时达到最大值,分别为462.47、271.86、210.36、116.38 mg·kg-1。植株对镉的富集系数均大于1,地上部对镉的最大富集量每盆为1 342.44μg·pot-1,每株为335.61μg·plant-1。说明细叶百日草对镉有很强的耐性和富集能力,是一种良好的修复镉污染土壤的观赏绿化植物。本文为观赏绿化植物应用于重金属污染土壤修复提供一定依据。

Effects of cadmium（ Cd） on growth and Cd accumulation characteristics of Zinnia angustifolia（ Z. linearis）plants were studied by pot-culture for exploring feasibility of phytoremediation technology using ornamental plants. The results showed that biomass of Z. linearis was promoted by Cd with concentration of less than 60 mg·kg^-1in soils,but that was not influenced by 120 mg·kg^-1. Cd content in different organs of Z. linearis showed a trend of that in roots was more than that in stems and leaves and flowers. Moreover,Cd content in different organs was enhanced with increasing of Cd concentration in pot soils,and the maximum was reached to 462. 47,271. 86,210. 36 and 116. 38 mg·kg^-1respectively at 120 mg·kg^-1Cd concentration. Value of Cd bioconcentration factors in plants was more than 1,and its highest accumulation in shoots reached to 1 342. 44μg·pot- 1,or 335. 61μg·plant- 1. These results suggested that Z.linearis plants should be chosen to be as a good ornamental to restore polluted soils by Cd due to its strong tolerance and accumulation for Cd. This work provided some evidences for using ornamental plants to restore polluted soils by heavy metals.