Ah
-h designates a zone of maximum "in situ" accumulation of humus at the surface of the soil profile
-these horizons are darker in olor than the horizons located lower in the soil profile (presence of organic carbon)
-they are typical of soils developed under grassland vegetation
Ae
-e indicates eluviation (downward movement or leaching) of clay or other minerals and/or humus, etc
-these horizons are generally lighter in color than the underlying horizons in the soil profile
-they are characteristic of surface horizons in soils formed under forest vegetation
Bt
-t indicates the accumulation of clay in a B horizon; the clay having been eluviated (moved down) from the Ae horizon above
-logically a Bt horizon is usually found immediately below an Ae horizon
-they are common in forested soils of western Canada, even after the land has been celared for agriculture or other uses
Bf
-f indicates the process of iron and aluminum oxides accumulation below a severely leached (eluviated) Ae horizon
-this is typical of B horizon(s) in soils found under well developed, extremely acidic deciduous or coniferous forest vegetation
-Bf soil horizons have a typical reddish-orange color (which is used as an easy-to-observe visual diagnostic in the field that can be verified with lab analysis to determine enrichment with Fe and Al)
-Bf hoizons are commonly found under highly leached Ae horizons
Ck
-k denotes the presence of carbonate minerals (free lime) often located in the lower C horizons(s)
-this is indicated by a characteristic effervenscence when treated with dilute acid
-the presence of carbonate minerals results in an alkalice pH(>7.5)
Cca
-indicates the accumulation (increase) of free lime
-note that Ck and CCa horizons are very commonly from the subsoils in soil profiles on the plains of western Canada
Csa
-indicates the accumulation of soluble salts and salinity
Cg
-indicates gleying as a result of a high water table
-also, a subsoil horizon may exist simply as a C horizon, which indicates the starting point or parent material (PM) of the soil profile with no or little modification from the original |