摘要
pH对酸性土壤中铝的溶出和土壤溶液中铝离子形态分布的影响的研究结果表明，土壤中铝的溶出量随pH降低而增加，pH对不同土壤中铝的溶出的影响不同，三种土壤中铝的溶出量受pH影响的大小顺序是：红壤＞赤红壤＞砖红壤，说明不同类型土壤中铝的溶出对外来酸的敏感程度不同。对三种单核无机形态铝的研究结果表明，土壤溶液中铝离子的形态分布随pH的改变而变化。随pH降低，Al3+占总单核无机铝的比例增加，而Al－F络合物呈相反的变化趋势，在所研究的pH范围内，Al-OH均占很小的比例，一般不超过总单核无机铝的5％。温度影响铝的溶出量和溶出的铝离子形态的分布，随着温度的降低，铝的溶出量增加，Al3+占无机铝的百分数增加，而Al-F络合物所占比例相应减小。土壤溶液中的聚合态铝占总酸溶性铝的比例随pH的降低而减小。在酸性至强酸性条件下（pH＜45），聚合态铝所占比例很小。对红壤和砖红壤的研究结果表明，酸性土壤中铝的溶解度主要受固相铝的氧化物所控制。
The influence of PH on the dissolution of aluminum in acid soils and the distributionof aluminum ion species in soil solution were studied. The results indicated that thedissolved aluminum increased with the decrease in PH. The effect of pH on thedissolution of aluminum varied with the soil type. The extent of PH influence on thedissolution of aluminum in three acid soils was in the order red soil>lateritic redsoil>latosil. It suggested that the sensitivity of aluminum dissolution to external acid wasdifferent among the three soils. The distribution of aluminum ion species in soil solutionvaried with PH The Proportion of Al3+ to total monomeric inorganic aluminum increasedwith the decrease in PH, but that of Al-F complexes increased with the increase in PH.Within the range of studied pH, the Proportion of AL-OH species was not higher than 5perent. Temperature affected the aluminum dissolution and the distribution of aluminumion species in soil solution. Both the dissolved aluminum and the proportion of A13+species increased with the drop in temperature, but the Proportion of Al-F complexesvaried with temperature in an oPPosite trend. A decrease in PH resulted in a decrease inthe Proportion of Polymeric aluminum ion species in soil solution. Therefore itsProportion was very small in acid to strongly acid soils (PH<4.5). The results obtainedfrom the red soil and latosol indicated that the solubility of aluminum in soil solutionwas controlled by aluminum oxides in soils.
出处
《土壤学报》
CAS
CSCD
北大核心
1998年第2期162-171,共10页
Acta Pedologica Sinica
基金
国家自然科学基金!49401009
9471041
关键词
酸性土壤
铝溶出量
铝离子形态
PH
Acid soil, Dissolved aluminum, Aluminum ion species, Effect of pH
