Stagnosol

AStagnosolin theWorld Reference Base for Soil Resources(WRB) issoilwith strong mottling of thesoil profiledue toredox processescaused by stagnating surfacewater.

Stagnosols are periodically wet andmottledin the topsoil andsubsoil,with or withoutconcretionsand/or bleaching. The topsoil can also be completely bleached (albichorizon). A common name in many national classification systems for most Stagnosols ispseudogley.In theUSDA soil taxonomy,many of them belong to the Aqualfs, Aquults, Aquents, Aquepts and Aquolls.

They are developed in a wide variety of unconsolidated materials likeglacial till,andloamy aeolian,alluvialandcolluvial depositsandphysically weatheredsiltstone. Stagnosols occur on flat to gently sloping land in cooltemperatetosubtropicalregions withhumidto perhumid climate conditions.

Theagriculturalsuitability of Stagnosols is limited because of theiroxygendeficiency resulting from stagnating water above a dense subsoil. Therefore, they have to be drained. However, in contrast toGleysols,drainage with channels or pipes is in many cases insufficient. It is necessary to have a higherporosityin the subsoil in order to improve thehydraulic conductivity.This may be achieved by deep loosening or deep ploughing. Drained Stagnosols can befertile soilsowing to their moderate degree of leaching.

Stagnosols cover 150–200 million ha worldwide. For the greater part in humid to perhumid temperate regions ofWestandCentral Europe,North America,southeastAustraliaandArgentina.Here Stagnosols are associated withLuvisolsas well assiltytoclayey CambisolsandUmbrisols.They also occur in humid to perhumid subtropical regions, where they are associated withAcrisolsandPlanosols. with a light-coloured,coarse-textured,surfacehorizonthat shows signs of periodicwaterstagnation and abruptly overlies a dense, slowlypermeablesubsoil with significantly more clay than the surface horizon. In the US Soil Classification of 1938 used the name Planosols, whereas its successor, theUSDA soil taxonomy,includes most Planosols in theGreat GroupsAlbaqualfs, Albaquults and Argialbolls.

References

IUSS Working Group WRB: World Reference Base for Soil Resources, fourth edition. International Union of Soil Sciences, Vienna 2022.ISBN 979-8-9862451-1-9([1]).

External links

profile photos (with classification)WRB homepage
profile photos (with classification)IUSS World of Soils

v t e Soil classification
World Reference Base for Soil Resources(1998–)	Acrisols Alisols Andosols Anthrosols Arenosols Calcisols Cambisols Chernozem Cryosols Durisols Ferralsols Fluvisols Gleysols Gypsisols Histosol Kastanozems Leptosols Lixisols Luvisols Nitisols Phaeozems Planosols Plinthosols Podzols Regosols Retisols Solonchaks Solonetz Stagnosol Technosols Umbrisols Vertisols
USDA soil taxonomy	Alfisols Andisols Aridisols Entisols Gelisols Histosols Inceptisols Mollisols Oxisols Spodosols Ultisols Vertisols
Other systems	FAO soil classification(1974–1998) Unified Soil Classification System AASHTO Soil Classification System Référentiel pédologique(French classification system) Canadian system of soil classification Australian Soil Classification Polish Soil Classification 1938 USDA soil taxonomy List of U.S. state soils List of vineyard soil types
Non-systematic soil types	Sand Silt Clay Loam Topsoil Subsoil Soil crust Claypan Hardpan Gypcrust Caliche Parent material Pedosphere Laimosphere Rhizosphere Bulk soil Alkali soil Bay mud Blue goo Brickearth Brown earth Calcareous grassland Dark earth Dry quicksand Duplex soil Eluvium Expansive clay Fill dirt Fuller's earth Hydrophobic soil Loess Lunar soil Martian soil Mud Muskeg Paleosol Peat Prime farmland Quicksand Serpentine soil Spodic soil Stagnogley Subaqueous soil Takir Terra preta Terra rossa Tropical peat Yedoma
Types of soil

Stagnosol

See also

References

Further reading

External links