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不同改良剂对石灰性镉污染土壤的镉形态和小白菜镉吸收的影响

DOI: 10.11654/jaes.2015.09.008

Keywords: 小白菜 镉吸收 改良剂 镉形态

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Abstract:

采用盆栽试验,分别在正常土壤(A)、低镉含量土壤(B)、高镉含量土壤(C)三种土壤上种植小白菜,研究4种改良剂(鸡粪、腐植酸、海泡石和生物炭)对小白菜生长、镉含量及土壤各形态含量的影响。结果表明,高施用量的鸡粪能显著提高小白菜的生物量,增加42.7%~79.8%。在B土壤中,除海泡石外,鸡粪、腐植酸和生物炭均增加小白菜地上部的镉含量;在C土壤中,4种改良剂对小白菜吸收镉均有促进作用。施入不同改良剂对土壤中镉形态的影响不同,在A土壤中镉主要以交换态和铁锰氧化态形式存在,在鸡粪和腐植酸处理下,土壤中镉主要以交换态和碳酸盐结合态形式存在,海泡石则增加了土壤中残渣态和有机态的比例。相关分析表明,小白菜镉含量与土壤中交换态镉、碳酸盐结合态镉、铁锰氧化态镉和有机态镉存在极显著正相关关系(P<0.01),与土壤总镉含量的相关性最好

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