Page 14 - World Reference Base for Soil Resources of Thailand

Land Development Department Library

Table 3 Diagnostic horizon properties and materials of WRB and characteristic of

soil taxonomy.

Diagnostic horizon
properties and materials Soil taxonomy

Abrupt textural change Abrupt textural change

Albeluvic tonguing** Interfingering of albic materials

Albic horizon Albic materials
Andic horizon** Andic soil properties

Anthraquic horizon Puddled layer and plow pan

Anthropedogenic horizons Surface and subsurface horizons resulting from long-term cultivation
Agric horizon Argillic horizon

Aridic properties** Surface features resulting from wind

Artefacts Human deposits, e.g., mine spoils, landfills

Calcaric soil material Strongly effervesces in 10% HCl

Calcaric soil horizon Calcareous throughout 20-50 cm layer
Calcic horizon Calcic horizon

Cambic horizon Cambic horizon

Colluvic material Natural transported parent materials, colluvium

Chernic horizon Black, biologically rich Mollic epipedon
Continuous hard rock Lithic contact

Cryic horizon** Permafrost

Dolomitic material** 2% or more dolomite, calcium magnesium carbonate

Duric horizon 10% or more silica-cemented durinodes
Ferralic horizon Oxic and kandic horizons

Ferralic properties Apparent CEC < 24 cmol kg clay
-1
Ferric horizon Coarse red mottles

Fluvic material** Stratified flood deposits

Folic horizon Folistic epipedon
Fragic horizon Strong structure restricts roots, and water movement restricted to cracks

Fluvic horizon** Black andic surface horizon

-1
Geric properties ECEC 1.5 cmol kg soil or less
Gleyic properties Aquic conditions

Gypsic horizon** Gypsic horizon
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