Stagnosol

A stagnosol in the FAO World Reference Base for Soil Resources is soil with strong mottling of the soil profile due to redox processes caused by stagnating surface water.

Stagnosols are periodically wet and mottled in the topsoil and subsoil, with or without concretions and/or bleaching. The topsoil can also be completely bleached (albic horizon). A common name in many national classification systems for most Stagnosols is pseudogley. In the USDA soil taxonomy, many of them belong to the Aqualfs, Aquults, Aquents, Aquepts and Aquolls.