This soil-forming process is termed calcification . This process is common in regions characterized by cool temperatures, high humidity supporting forest vegetation. Because of the high rainfall, leaching of salts from the profile occurs. Few bases are absorbed by tree roots and the soil becomes acidic from the production of orgainc acids during the decomposition of organic matter. Iron, aluminum and other inorganic materials become soluble in the upper profile and are translocated to a lower horizon.
Infertile soils result.
However, the climate is warm to hot, humid with high rainfall and no dry season. Leaching of bases is intense, so that hydrolysis of minerals is rapid. These are absorbed by the rapidly growing vegetation. The dead vegetation or forest floor litter is decomposed rapidly. Nutrient cycling is therefore rapid, but the amounts are small.