酸化土壤活性铝溶出及形态变化的初步研究

Leaching of active aluminum species in acidified soils.

用模拟酸雨酸化浙江省３种主要类型土壤，研究了酸化土壤活性铝的溶出和铝的形态变化。结果表明：酸雨对强酸性土壤（ｐＨ＜５）中活性铝的释出有一定促进作用，活性铝以Ａ１￣（３－）离子为主。当土壤ｐＨ值＞５时．活性铝以单聚羟基铝为主。酸化土壤中的活性铝主要是由土壤中固相的Ａｌ（ＯＨ）转化而来。

The soils sampled from different areas in Zhe-jiang province were acidified by simulated acid rain,leaching of active Al and changing of Al species in the acidefied soils were studied .The results indicated that acid rain could pro-mote release of active Al from acid soils .When soil pH value wax>5.significant fraction of active Al in soil would be mononuclear Al species .However,when soil pH value was<5.the Al in soil would be Al￣(3-) species .The active Al in acidi-fied soils was transformed from solid Al(OH) of soil.