Soil organisms such as earthwormspotworms enchytraeidsarthropodsnematodesfungiand many species of bacteria and archaea are concentrated here, often in close association with plant roots. This layer may accumulate the more soluble compounds like CaCO 3. L layers include coprogenous earth or sedimentary peat mostly organicdiatomaceous earth mostly siliceousand marl mostly calcareous. Your browser does not support. Retrieved from " https: Walking as little as ten metres in any direction and digging another hole can often reveal a very different profile in regards to the depth and thickness of each horizon.
The H horizon is formed from organic residues that are not incorporated into the mineral soil.
In a soil, where substances move down from the topsoil, this is the layer, where they accumulate. Australian Journal of Soil Research, v. Suffixes, in form of lowercase letters and figures, further differentiate the master horizons. An E horizon is usually, but not necessarily, lighter in colour than an underlying B horizon. The A horizon may be further subdivided into A1 dark, maximum biologic activityA2 paler and A3 transitional to the B horizon.