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有机无机配施对生菜生长及其Cd Pb含量的影响

Keywords: 土壤,有机肥,无机肥,生菜,重金属污染

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Abstract:

为了比较等氮水平下不同有机肥及其与无机肥配施对土壤重金属的钝化效果,通过在0.2g·kg-1氮水平下单施商品有机肥、猪粪、牛粪、鸡粪和花生麸,及5种有机肥分别与无机肥(尿素+磷酸二氢钙+硫酸钾)配施(N∶N=1∶1)的盆栽试验,研究它们对重金属污染土壤上生菜(Lactucasativa)生长及其Cd、Pb含量的影响。结果表明,与CK相比,有机肥可提高生菜的生物量(商品有机肥单施除外),有机肥单施时,鸡粪处理生菜的鲜重最高,配施时牛粪和鸡粪处理生菜的生物量最大。无论单施或配施,花生麸和鸡粪处理降低生菜地上部Cd含量的效果最好,且鸡粪较好地降低了生菜地上部Pb含量。牛粪和花生麸配施的Pb含量显著低于单施,猪粪和商品有机肥单施的Pb含量显著低于配施,其余单施和配施之间没有显著差异。因此,鸡粪是5种有机肥中较适合施用于重金属污染菜地土壤的有机肥。

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