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A soil‐forming process by which the upper horizon of a soil becomes acidic through the leaching of bases which are deposited in the lower horizons (for example, in a pedalfer). It usually occurs under forests in areas with cool, moist climates and quite severe winters, where decomposition of organic matter is inhibited and a peaty mat of acidic organic material builds up on the soil surface. Mixing of organic matter and mineral matter within the soil is very limited because there are relatively few organisms.

Subjects: Environmental Science.

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