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OALib Journal期刊
ISSN: 2333-9721
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籽粒苋对土壤中镉的耐性及积累特征研究
DOI: 10.3724/SP.J.1145.2010.00028, PP. 28-32
Keywords: 籽粒苋,镉,植物修复,耐性,重金属,超富集植物
Abstract:
籽粒苋是一种生物量大、易栽培的镉（cd）富集植物，具有作为cd污染土壤修复植物的潜力.比较了两个基因型籽粒苋（k112和r104）的耐cd性特征，土壤cd污染浓度范围是0~50mgkg-1，生长60d收获.结果表明，籽粒苋k112（amaranthushypochondriacusl.cv.‘k112’）与r104（a.hypochondriacusl.cv.‘r104’）生物量随土壤中cd浓度的增加而逐步下降，在土壤中cd浓度<16mgkg-1时，其生物量积累没有受到明显的影响.在本试验最高cd浓度条件（50mgkg-1）下仍可生长，但生物量显著下降.两种籽粒苋叶中cd含量随土壤中cd浓度增加而快速上升，在土壤cd浓度为16mgkg-1时，叶内cd浓度分别达120.63和109.96mgkg-1(dw)，达到超富集植物的临界标准.cd在植物体内的分布特征为叶>根>茎.籽粒苋两个品种相比，k112吸收cd的能力大于r104，尤其是在高cd浓度时，两种籽粒苋对cd的绝对提取量相似，并随土壤cd浓度的上升而快速增加.籽粒苋k112和r104对土壤中的cd具有很强的耐性和积累的能力，可作为cd污染土壤的修复植物.图4表1参22
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