Alfisols are a soil order in USA soil taxonomy. Alfisols form in semiarid to humid areas, typically under a hardwood forest cover. They have a clay and nutrient-enriched subsoil. Because of their productivity and abundance, the Alfisols represent one of the more important soil orders.

Suborders

Aqualfs — wet soils; aquic soil moisture regime

Boralfs — cold climate; frigid or cryic soil temperature regime

Udalfs — humid climate; udic moisture regime

Ustalfs — subhumid climate; ustic moisture regime

Xeralfs — Mediteranaean climate; xeric moisture regime

See also

Pedogenesis
Pedology (soil study)
Soil classification
Soil science
Soil type

External Links

SSSA glossary - alfisols (http://www.soils.org/cgi-bin/gloss_search.cgi?QUERY=Alfisols)
USDA - NRCS - alfisols (http://soils.usda.gov/technical/classification/orders/alfisols.html)
University of Idaho - alfisols (http://soils.ag.uidaho.edu/soilorders/alfisols.htm)
University of Florida - alfisols (http://grunwald.ifas.ufl.edu/Nat_resources/soil_orders/alfisols.htm)