Comparatively, based on the quantitative analysis of highly reactive Al and Fe minerals in 1990 and 2013, the allophane concentration increased from 6.74 ± 0.18 to 13.3 ± 1.2 g/kg, and the
ferrihydrite concentration increased from 3.37 ± 0.15 to 7.56 ± 0.28 g/kg soil DW (P < 0.05).