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酸雨作用下红壤铅的释放特征与规律研究

Keywords: 酸雨,红壤,,释放

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Abstract:

采用人工模拟酸雨淋溶装置,研究了酸雨作用下红壤铅的释放特征与规律。结果表明,酸雨对铅释放的影响呈现一定的规律性,在淋溶前期,铅释放因土壤不同而表现出较大的差异,当淋溶到中期以后,供试红壤铅释放量均表现为随淋溶量的增加而上升。模拟酸雨对红壤中铅的释放产生明显影响,影响的程度因供试红壤不同而异。经过9150~10650mm模拟酸雨淋溶以后,与对照相比,pH4.5的酸雨使红壤铅累积释放量提高10.64%~99.19%,pH3.5的酸雨使其提高17.02%~483.15%。铅累积释放量与淋溶量的关系可用一元二次式来描述,供试红壤平均铅累积释放量(Q)随淋溶量(H)的变化为Q=-2.5335+0.0266H+6.8677×10-7H2。

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