模拟酸雨对南方土壤硅铝释放的影响

Releasing of Si^(2+) and Al^(3+) under Simulated Acid Rain in South China

通过模拟酸雨淋溶实验，分析了淋溶液ｐＨ值和硅铝离子释放规律和特点的关系．结果表明，模拟酸雨的酸度是决定土壤中硅铝淋溶释放量的主要因素．当ｐＨ＞ ３．０时释放量增幅较为缓慢，而ｐＨ＜ ３．０以后释放量骤增．土壤溶液中Ｈ＋ 浓度的增加，使得以水解反应为主要过程的土壤矿物的风化作用加强。

This paper dealt with the relationship of pH value and the characteristics of Si 2+ and Al 3+ of leaching solutions under the treatment of simulated acid rain in main soil types collected from South China. The results showed that amounts of Si 2+ and Al 3+ releasing were decided mainly by pH value of simulated acid rain.When pH was lower than 3.0,the amounts of releasing increased sharply.Otherwise,the amounts of Si 2+ and Al 3+ released from soils increased slowly.As the addition of H + concentration in soil solution,the amounts of released Si 2+ and Al 3+ increased with the acceleration of the hydrolysis reaction of soil minerals,which usually were the most important soil weathering process.