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The Twelve Soil Orders
N/A
16
Science
Graduate
05/04/2011

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Cards

Term
Name the three climate specific soil orders
Definition

aridisol

spodosol

gelisol

Term
aridosol
Definition
soils in arid environments (higher pH) with moderate to strong development
Term
spodosol
Definition
acid soils with a subsurface accumulation of metal-humus complexes
Term
gelisol
Definition
soils with permafrost within 2 m of the surface
Term
name the three material specific orders
Definition

vertisol

andisol

histosol

Term
histosol
Definition
organic soils
Term
andisols
Definition
soils formed in volcanic ash
Term
vertisols
Definition
soils with high shrink/swell capacity
Term
name three soils that form through maturation (loss of Si)
Definition

alfisol, ultisol, oxisol

('Are U Old')

Term
alfisol
Definition
soils with a subsurface zone of silicate clay accumulation and >35% base saturation
Term
ultisol
Definition
subsurface zone of silicate clay accumulation and <35% base saturation
Term
oxisol
Definition
intensely weathered soils of tropical and suptropical environments
Term
name three soil orders in order of increasing horizon development
Definition

entisol

inceptisol

mollisol

(earliest, intermediate, mature)

Term
entisol
Definition
soils with little or no morphological development
Term
inceptisol
Definition
soils with weakly developed subsurface horizons
Term
mollisols
Definition
grassland soils with high base status (> 50% base saturation)
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