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细叶百日草对镉的生长响应及富集特征研究

DOI: 10.11869/j.issn.100-8551.2015.08.1577, PP. 1577-1582

Keywords: 细叶百日草,,富集特征,植物修复

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Abstract:

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(Zinniaangustifolia(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≤60mg·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120mg·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120mg·kg-1时达到最大值,分别为462.47、271.86、210.36、116.38mg·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1342.44μg·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。

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