苎麻吸收积累镉的季别差异研究

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以9个苎麻栽培品种为材料,通过盆栽试验模拟不同Cd污染环境,对不同季别苎麻的生物量及吸收积累镉情况进行研究.结果表明,不同季别间苎麻生物量差异显著,随着季别增加,苎麻地上部镉含量减少,地上部生物量增加,其中富顺青麻地上部生物量增量最大,次年头麻较当年二麻显著增加56.59%,宜春红心麻生物量增量最小,次年头麻较当年二麻仅增加14.33%.苎麻地上部镉含量和镉积累量品种间存在显著差异,富顺青麻平均地上部Cd含量与积累量高于其它品种,湘苎3号平均地上部Cd含量、大红皮2号Cd积累量低于其它品种,其中富顺青麻、小鲁班和湘苎2号次年头麻的地上部Cd积累量高于前两次,分别较头年二麻增加30.03%、28.28%、35.56%.因此,通过连续种植高镉积累的苎麻品种可用于修复重金属镉污染土壤.
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