酸雨作用下红壤铜释放特征与规律研究

Investigation on Release of Copper from Red Soils under the Influence by Simulated Acid Rain

采用室内模拟酸雨淋溶土柱的方法,研究了酸雨影响下红壤中铜的释放特征与规律．在淋溶前期,铜释放因土壤不同而表现出一定的差异,当淋溶到中期以后,多数情况下红壤铜释放量表现为随淋溶量的增加而上升．模拟酸雨对红壤中铜的释放产生明显影响,影响的性质和程度因供试红壤不同而不同．经过9150～10650mm模拟酸雨淋溶以后,与对照相比,pH4．5的酸雨使红壤铜累积释放量提高-3．45%～82．23%;pH3．5的酸雨使其提高-3．11%～258．89%．铜累积释放量与淋溶量的关系可用一元二次式来描述,供试红壤平均铜累积释放量(Q)随淋溶量(H)的变化为Q=-0．5051+0．0044H+7．2179×10^(-8)H^2．图4,表1,参9．

A soil leaching column experiment was designed to investigate the release of copper from red soils under the influence by simulated acid rain. In initial stage of the leaching experiment, the releases of copper from various red soils were difference. After middle stage, the releases of copper went up for most tested red soils. Acid rain exerted an obvious effect on the release of copper, and the degrees of the effect were different for the distinctness of the tested soils. After simulating rainfall of 9 150 - 10 650 mm, compared with the control, pH4.5 acid rain enhanced cumulative release amount of copper -3.45% - 82.23%, and pH3.5 acid rain enhanced it -3.11% - 258.89%. The cumulative release of copper can be described with quadratic model, and the quadratic model of the average cumulative release of the tested soils is Q=-0.5051＋0.004 4H＋7.217 9 × 10^-8H^2. 4figs., ltab., 9refs.