铜离子吸附对可变电荷土壤与恒电荷土壤铝释放的影响

研究了两种可变电荷土壤和两种恒电荷土壤在不同铜离子浓度条件下,pH 对铝释放的影响。结果显示，随着加入铜离子浓度的增加，离子交换作用而引起的可溶性铝也随之增加，相同pH 条件下，可溶性铝的解吸量依次为砖红壤>红壤>黄棕壤>棕壤，恒电荷土壤中铜离子浓度变化对铝释放的影响较可变电荷土壤更大，当pH大于3.6（恒电荷土壤）或pH 大于4.0（可变电荷土壤）时，溶液中可溶性铝的含量几乎可以忽略不计。因此在所研究的铜离子浓度范围内，引起可溶性铝离子量变化的主导因素应该是体系pH 值的变化而非铜离子的吸附。

Effects of Cu2+ adsorption on release of Aluminum in variable charge soil and constant charge soil

Effects of pH on the amounts of change-available aluminum under different copper ion concentrations in two variable charge soils and two constant charge soils were studied. The results showed that the amount of changeavailable aluminum occurred by Cu2+ exchange increased with the increase of Cu2+ concentration. The order of changeavailable aluminum desorption was Ferralsol>Acrisol>Yellow-brown soil>Brown soil. When the pH value was over 3.6 (constant charge soils) or over 4.0(variable charge soils), the content of charge-available aluminum was almost neglected. It can be deduced that not the adsorption of Cu2+ but the pH is the main reason which occurred the change of changeavailable aluminum.