In the intricate world of soil taxonomy, dramatic layers often steal the spotlight. The dark, organic-rich signals grassland fertility. The white, leached Albic horizon speaks of podzolization. And the rusty, clay-coated Argillic horizon reveals the movement of fine particles. Yet, buried between these extremes lies one of the most frequently encountered—yet most subtly defined—diagnostic horizons in soil science: the Cambic horizon .
[Parent Material / C Horizon] │ ▼ (Loss of carbonates / Mineral dissolution) [Structure Development] (Subangular blocky rearrangement via wetting/drying) │ ▼ (Oxidation of iron / Weathering of primary minerals) [Cambic Horizon / Bw] (Distinct color and structural change) cambic horizon
The altered layer must be at least 15 centimeters thick. In the intricate world of soil taxonomy, dramatic
An is a subsurface diagnostic soil horizon characterized by the accumulation of silicate clays. It is a key concept in soil classification systems like USDA Soil Taxonomy and the WRB (World Reference Base for Soil Resources). And the rusty, clay-coated Argillic horizon reveals the
A is a subsurface diagnostic soil layer that has undergone physical, chemical, or mineralogical alterations due to soil-forming (pedogenic) processes, without significant accumulation of illuvial materials like clay, organic matter, iron, or aluminum oxides. In soil taxonomy, it is designated as a Bw horizon and serves as the definitive signature of young to moderately weathered soils. It acts as a transitional developmental phase between unaltered parent rock and highly weathered, older soil structures. Core Diagnostic Criteria
According to the and the World Reference Base for Soil Resources (WRB) , a Cambic horizon is a subsurface horizon (commonly a B horizon) that shows evidence of alteration relative to the parent material but does not meet the stricter requirements for more advanced horizons like the Argillic, Kandic, Spodic, or Oxic horizons.
