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Orders

Soil Taxonomy

TermDefinition
Entisols A/C , no diagnostic horizons young soils < 1,000 y/o -ent
Inceptisols A/Bw/C , Cambic Bw, umbric second to youngest soil; Bw take 5,000 yrs -ept
Aridisols aridic moisture regime ochric epipedon, no mollic salt and silica at depth dry > 50% year -id
Mollisols mollic epipedon, BS > 50% generally found under grasslands -oll
Alfisols Bt (at least 15,000 yrs), red, usually ochric BS > 35% -alf
Spodosols spodic horizon; Bs no E mandatory forest soil -od
Ultisols Bt with low BS (< 35% in Bt) really thick Bt 1 million yrs red, old, well-developed and leached forest soils -ult
Oxisols lateritic soils; high Fe and Al, no argillic red; jungle type of soil - old, leached red brick Cambodia, SE Asia -ox
Vertisols mixed up, high clay with > 30% in all horizons cracks, shrink-swell clays (smectite), mixing -ert
Andisols is a new order BD < .95 > 60% pyroclastics well-drained volcanic soils
Histosols > 30 cm OM depth up to 40 cm wetland, bog soils -ist
Gelisols permafrost within 100 cm of surface (pergilic temp regime) or gelic materials (soils with cryoturbation features) within 100 cm and permafrost within top 200 cm
Created by: rockpockets
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