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锌对土壤镉有效性的影响及其机制

Keywords: ,,小油菜,赤红壤,有效性

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Abstract:

采用盆栽试验,研究了赤红壤上两种镉污染水平下,施用不同用量锌对小油菜生物量、镉吸收量及土壤溶液中锌、镉浓度等的影响。结果表明,低镉污染水平时,增加锌的施用量,可明显促进小油菜的生长;高镉污染水平时,不同用量的锌间,第一季时小油菜的生长有明显不同。两种镉污染水平下,增加锌的施用量,土壤溶液中锌浓度明显增加,镉浓度变化不大;小油菜体内镉含量明显降低。低、高镉污染水平下,锌用量为64mg·kg-1土时,小油菜体内镉含量较不施锌肥分别降低31.8%、28.4%(两季平均值)。在两种镉污染水平的赤红壤上,锌/镉比(质量比)与小油菜体内镉含量呈显著负相关。在同一镉污染水平下,增加锌的用量后,土壤溶液中锌/镉(质量比)的大小可以反映镉有效性的高低。

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