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4种蔬菜对硒酸盐的吸收、富集与转运特征的研究

Keywords: 蔬菜,硒酸盐,吸收和转运

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Abstract:

用盆栽试验研究了不同含量硒酸钠对4种蔬菜(小白菜、芥菜、生菜和菠菜)生长、硒吸收及转运特征的影响,为富硒蔬菜的开发和硒污染土壤的植物修复提供理论依据。结果表明,低含量的硒酸钠态硒(2.04mg·kg-1)对蔬菜有明显的毒害作用。供试的4种蔬菜地上、地下部硒含量均随外源硒含量的增加显著增大(P小白菜>菠菜>生菜。所有施硒处理小白菜、芥菜和生菜地上硒含量约是地下硒含量的1~2倍,菠菜地上与地下硒含量与土壤硒含量高低有关,当土壤硒含量5.02mg·kg-1时,地上部硒含量大于地下部。4种蔬菜相比较,地上部硒富集系数(BCFshoot/soil)值的大小依次为小白菜≈芥菜>菠菜>生菜,地下部富集系数(BCFroot/soil)值的大小依次为芥菜>小白菜>菠菜>生菜;以小白菜对硒的转运系数(TF)值最大,菠菜最小。供试的4种蔬菜中,小白菜因具有较高的将六价硒从地下转运到地上的能力,且拥有

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