Fiberriktlagret

Fiberriktlagret, literally the fiber-rich layer, is a term used in Scandinavian contexts to refer to a layer within soils or sediments that contains a high proportion of fibrous plant material. The descriptor emphasizes the persistence of recognizable plant fibers, such as stems, roots, and other lignocellulosic residues, within the layer.

Formation and occurrence

Fiberriktlagret can form in environments where plant litter accumulates faster than it decomposes, often in wetlands, peatlands, or organic-rich soils. Limited microbial activity, water saturation, or anoxic conditions slow decomposition, allowing fibrous material to retain its structure. The layer may be situated near the surface or within deeper horizons, depending on local vegetation history and hydrology.

Characteristics

Typical features include a visible fibrous texture, a tendency to feel stringy or woody when handled, and a relatively high content of undecomposed or partially decomposed plant matter. The color of fiberriktlagret is frequently dark to brown, reflecting elevated organic content. It often exhibits distinct physical properties, such as higher porosity and water-holding capacity compared with mineral horizons, and it may influence root penetration and drainage.

Significance and interpretation

In soil surveys and ecological assessments, fiberriktlagret can indicate stages of peat formation, succession in wetlands, or specific drainage conditions. The layer provides insight into past ecological conditions, carbon storage potential, and the resilience of the soil to disturbances. While the term is most commonly used in regional or educational contexts, it helps describe a recognizable textural feature that affects soil behavior.

See also: peat, organic soil, fibric horizon, soil organic matter.