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-  2015 

香溪河消落带狗牙根对重金属镉的积累特性与机制 Accumulation Characteristics and Mechanism of Cd in Bermudagrass on Water-Level-Fluctuating Zone along Xiangxi River

Keywords: 香溪河,,狗牙根(Cynodon dactylon(L.)Pers.),积累特性,机制

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Abstract:

于三峡库区香溪河消落带(145~175m)采集11个狗牙根(Cynodon dactylon(L.)Pers.)及其根际土样品,测定狗牙根总镉(BT-Cd)含量和根际土的理化特性(有机质、粘粒、P、S、K、Fe、Al、Mn、B、Ca、Cu、Cd、Zn和pH),运用模型模拟两者之间的关系,揭示狗牙根对镉(Cd)的积累特性与机制.结果表明:香溪河消落带BT-Cd含量未超过中国国家饲料卫生标准Cd含量(0.5mg·kg-1);BT-Cd含量与土壤总磷(ST-P)、土壤Mehlich3-P(SM3-P)含量间存在正相关关系,与土壤总镉(ST-Cd)和土壤Mehlich3-Cd(SM3-Cd)之间无显著相关;基于土壤综合特性构建植物富集重金属的模型,能很好地模拟狗牙根对Cd的富集

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