土壤与酸的反应时间对土壤酸度及土壤溶液中铝离子形态分布的影响

用两种土壤研究土壤与酸的反应时间对土壤酸度及土壤溶液中铝离子形态分布的影响。结果表明，土壤溶液pH随反应时间增加而增加，安徽红壤pH的增幅大于江西红壤。在pH3.0的HNO3溶液中，土壤溶液中的总铝及Al3 均随反应时间增加而减少，而在pH3．5的HNO3溶液中，土壤溶液中总铝及Al－F络合物先随反应时间的增加而减小．然后又有所增加。

Effect of reaction time of soil with acid on soil acidity and the distribution of aluminum species in soil solution

Two red soils were used to study the effect of reaction time of soils with acid on soil acidity and the distribution of aluminum species in soil solution The results indicated that the soil solution pH increased with the reaction time and the change in pH value for red soil from Anhui Province was larger than that for red soil from Jiangxi Province. When soil was added onto HNO3 solution with PH3.0. the concentrations of total Aluminum and A13 in soil solution decreased with the reaction time. But when it was added into HNO3 solution with PH 3.5, the concentrations of total aluminum and Al-F complexes in soil solution decreased with the reaction time first and then increased.