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.