Under the condition of relatively high content of Fe oxides in red soil, protonation may play an overwhelming role in H(superscript +) consumption, whereas Al dissolution may play only a minor role.

• 当红壤中氧化铁含量较高时，铝的溶解在H(上标+)消耗中只起次要作用，质子化过程是H(上标+)消耗的主要途径。