AB or BA: A transitional layer than shows characteristics of both A and B horizons. The dominant horizon is listed first. ABgj: An AB horizon characterized by faint to distinct mottling within 50 cm of the soil surface. The A horizon features are dominant over B horizon features.

Sometimes a layer is not clearly one process or another, but rather where two are combining. These are called transitional horizons, and indicated by two capital letters like AB or BA. The first of the two is the more dominant of the two processes.

2023年2月17日 · There are six different layers or horizons that make up a mature soil profile. These layers or horizons are represented by alphabets O, A, E, C, B, and R. Immature soils lack some of these layers. ‘O’ is for organic. This layer is the uppermost layer of the soil rich in organic matter, such as the remains of plants and dead animals.

i) The horizon is dominated by properties of one master horizon but has subordinate properties of another. Two capital letter symbols are used in combination, identifying each of the contrib-uting Master horizons (AB, EB, BE, BC, etc.). The master horizon symbol listed first desig-nates the kind of master horizon whose prop-

This map displays the distribution of the main soil types found within the province. The distribution pattern of soils in Alberta is strongly linked to climate and parent materials. Climate affects the location of different soil groups. The driest area in southeastern Alberta is represented by the presence of Brown Chernozems.

A soil horizon is a layer of mineral or organic soil material approximately parallel to the land surface that has characteristics altered by processes of soil formation. It differs from adjacent horizons in properties such as color, structure, texture, and consistence and in chemical, biological, or mineralogical composition.

A A A horizons: Mineral horizons that formed at the surface or below an O horizon and (1) are characterized by an accumu-lation of humified organic matter intimately mixed with the mineral fraction and not dominated by

The first of these symbols indicates that the properties of the horizon so designated dominate the transitional horizon. An AB horizon, for example, has characteristics of both an overlying A horizon and an underlying B horizon, but it is more like the A than like the B.

Two capital latter symbols are used, such as AB, EB, BE, or BC. The master horizon symbol that is given first designates the kind of master horizon whose properties dominate the transitional horizon. In the other, distinct parts of the horizon have recognizable properties of the two kinds of master horizons indicated by the capital letters.

The horizon description system begins by splitting soil horizons into two distinct groups: organic and mineral horizons. Organic horizons are those that contain 17% or more organic carbon; mineral horizons have less than 17% organic carbon. The major symbols used in describing mineral soil layers in Canada are shown in the following tables.