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The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer.

[illuvial, resulting from illuviation (in- + -luvial, relating to the action of flowing water, as in alluvial) + -ation.]


(Geological Science) the process by which a material (illuvium), which includes colloids and mineral salts, is washed down from one layer of soil to a lower layer
[C20: from Latin illuviēs dirt, mud, from il- + -luviēs, from lavere to wash]
ilˈluvial adj


(ɪˌlu viˈeɪ ʃən)

the accumulation in one layer of soil of materials that have been leached out of another layer.
References in periodicals archive ?
The dominance of forest vegetation in this region does not help matters as SOM and nutrients are recycled downwards through illuviation unlike in grass land vegetations.
The roots of sugarcane, which can reach a depth of 2 m in soils, may have facilitated further accumulation of organic material at depth, either by root development and dieback or even by illuviation.
Buurman P, Jongmans AG, Pi-Pujol MD (1998) Clay illuviation and mechanical clay infiltration--is there a difference?
The SOC flow in the composition of organic matter begins with litter falling on or into the soil, continues with its disintegration, transformation into humus and accumulation, and ultimate disappearance, via consumption by soil organisms, complete mineralization or illuviation into the subsoil, or eluviation out of the soil cover.
In other areas, clay illuviation is less expressed or absent due to various causes which acted singly or jointly: recent water-deposited sediments, soil water excess, clay flocculation in calcareous materials or swell-shrink movements.
Pedogenic process of clay illuviation is typical for Albeluvisol and Luvisol.
The soils of the study area are classified as Alfisols, characterized by a subsurface horizon in which silica has accumulated by illuviation (Brady and Weil 1996).
Absolute age in the OF is unknown, but the appreciable clay formation and illuviation indicates considerable weathering of the sand that implies a possible Late-Glacial age (Kellman, 1990).
The word for this accumulation is illuviation (figure 2-18).
The Bm horizon may have any or all of the following characteristics: stronger chroma or redder hue than the underlying material, partial or complete removal of carbonates, slight illuviation of clay based mainly on the presence of an Ae horizon (E horizon in U.