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青霉菌A1对土壤中Cu2+化学形态的影响

Keywords: 青霉,生物有效性,化学形态

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Abstract:

从一铜矿尾矿土壤中分离得到的高抗重金属盐青霉菌A1,对各重金属盐的最高抗性能力分别为Cu2+150mmol·L-1、Zn2+150mmol·L-1、Pb2+35mmol·L-1、Ni2+15mmol·L-1、Cr6+5mmol·L-1、Cd2+5mmol·L-1。该青霉菌的生长可以增加培养液的酸性。采用室内培养方法,研究了A1对土壤中Cu2+化学形态的影响。结果表明,A1的侵染使每千克土壤中水可溶态铜降低3.8mg,酸提取态、氧化结合态、有机结合态铜分别增加6.1、7.07、7.28mg;相比于未侵染A1的情况,铜的水可溶性量降低了23.3%,酸提取态增加3.1%,氧化结合态增加5.7%,有机结合态增加7.9%,残余态减少5.3%。因此,青霉菌A1可有效地改变土壤中Cu2+的化学存在形态,影响铜的生物有效性。

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