模拟酸雨对土壤活性铝释出影响研究

采用室内动态淋溶方法研究了模拟酸兩对浙江省主要酸性土壤活性铝释出的影响。结果认为:酸雨对强酸性土壤活性铝的释出有一定的促进作用;当土壤酸化至pH为4.3时,才会导致活性铝迅速大量释出;促使土壤开始迅速大量释出活性铝的酸雨“临界淋溶量”与其酸度变化呈负相关,两者增减的倍比值基本相同。可利用此相关关系,对酸雨促进土壤活性铝释出的潜在影响进行定量化预测。

The Effect of Simutating Acid Rain on the Release of Active Aluminum from Soil

The effect of simulating acid rain on the release of active aluminum from a typical acidic soil of Zhejiang Province was investigated by dymanic leaching experiments under laboratory conditions. Results indicate that much of the active Al would be released from soil if the soil is leached by acid rain with pH value lower than 4.3 over a long period of time; the critical acid rainfall, which leads the guick release of active Al from soil, is inversely proportional to the acidity of the acid rain. Based on the relationship between the critical acid rainfall and the acidity of the acid rain, the possible effect of natural acid rain on the release of active Al from soils can be assessed.