illuviation


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illuviation

[i‚lü·vē′ā·shən]
(geology)
The deposition of colloids, soluble salts, and small mineral particles in an underlying layer of soil.
References in periodicals archive ?
3+] cations takes place, clay illuviation ceases (Fig.
The SOC accumulation in the SSL of mineral soils depends primarily on the presence of illuviation, eluviation, and/or podzolization processes; 22-25 Mg [ha.
The consequences of clay illuviation are a reduction of permeability to air and water in Bt horizons and the difficulty for roots to penetrate in them.
Extensive illuviation has taken place in these soils, creating an argillic horizon so that the negative charge of subsoils is systematically higher than for topsoils (Fig.
2009, 2010), textural pedofeatures, indicative of clay illuviation, were found in one of the cohesive horizons (P4Btl; Fig.
Illuviation, bioturbation, and wind-throw are probably the main processes that influence the vertical distribution of bio-opal in soils (Saccone et al.
Saprolite that has undergone substantial pedoplasmation and clay illuviation may contain an increased concentration of disaggregated, angular quartz grains (Fig.
Common concerns arising from a study of the application of ST (Soil Survey Staff 1975) to soils of Queensland (Moore 1986) included the use of clay illuviation (Brewer and Sleeman 1986; Walker 1986), use of soil moisture regimes and temperature regimes (Williams and Isbell 1986; Murtha 1986), the impracticality of determining weatherable minerals (Beckmann and Page 1986), and the possibility of inconsistencies when determining base saturation (Bruce 1986).
One of the main agricultural soil types here, cinnamon soil (Ustalfs), is a result of calcium carbonate leaching, illuviation, and humification and has a thin humus layer and medium or thick solum.
All soils in this study are deep and several profiles exhibit clay accumulation in their subsoils relative to topsoil due to clay illuviation.
Boron (B) is involved in important soil processes (Kovda 1973): the intra-soil biological cycle; humification; isomorphic substitution in clay minerals and the formation of colloids; and illuviation.