(2) Under the action of eluviation
, the [Ca.sup.2+] ion content in deeper soil increased due to the [Ca.sup.2+] ion content accumulating and moving down, and the influence depth reached 1.5 m.
Evidently, the simultaneous eluviation
of hydrophilic organic substances and sesquioxides leads to a joint illuviation in the Ihf horizon.
E The E horizon, the zone of greatest eluviation
, is very leached of clay, chemicals, and organic matter.
. Removal of a material, such as clay or nutrients, from a layer of soil by percolating water.
This vertical distribution pattern can be explained by chemical eluviation
due to water flow in the soil profile.
All carbon in soil profiles was not accounted for as the database does not contain OC data for all subsurface horizons and selecting only surface horizons avoids accounting for buried topsoils or eluviation
of carbon and re-deposition in subsoil horizons.
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.
The possible reason for this phenomenon is that soil organic matter tended to be adsorbed by soil clay under conditions of intensive eluviation
Morphological features of clay eluviation
, formation of evident clayskins, and presence of argillic properties are still lacking.
However, EC trended downward in UUU at the 0-10 cm depth and also over the 0-30 cm depth, probably reflecting enhanced eluviation
of nutrients from the soil beds.
The higher bulk density in the second soil layer can be explained by eluviation
of fine soil particles from the top layer into the layer below due to puddling (Aggarwal et al.