This leads to a perched water table. Some areas in N Europe that were once deciduous forest were clearcut, and burned. Heather and other ericaceous plants invaded. Foliage more acidic, led to change in soil processes, iron pan, perched water table, heaths, and less productive land. In hot, wet climates, Fe and Al are changed to insoluble compounds are so are not eluviated.
Decomposition is rapid, very little organic matter accumulates.
Silicas and other minerals are leached into soils profile. Since nutrients are in biomass, removal of forest leads to rapid decline in productivity. In extreme situations these clayey soils become brick-like in consistency and very poor. Oxisols are severe examples. Term in some disrepute as it is over-applied.