albic horizon

albic horizon

[′al·bik hə′rīz·ən]
(geology)
A soil horizon from which clay and free iron oxides have been removed or in which the iron oxides have been segregated.
References in periodicals archive ?
1]), which promotes the process of podzolization and development of the Albic horizon.
We agree with Reintam (2002) that in Latvia, similarly to Estonia, the Albic horizon that can be formed either as a result of lessivage, podzolization or reductomorphic processes is characteristic of Albeluvisols.
Due to the large proportion of Ca-fulvates, humus is Ca-fulvic in the albic horizon as well as in the yellow area of the spodic horizon.
About a twofold increase in the content of fine sand and a more than 120-fold increase in very fine sand have taken place in the albic horizon, while silt and clay have accumulated in particularly large quantities in the brown area of the spodic horizon.
Although an accumulation of sand was found not only in the albic horizon, but also in the mellowed yellow area of the spodic horizon, an equal balance of the sand fraction has been formed in the entire profile.
Only the albic horizon is almost free from pigments.
Microcline accounts for only some per cent of feldspars, which is a little more preserved in the albic horizon and has disappeared from the spodic horizon.
The largest increase in the heavy mineral suite in the very fine sand of the albic horizon appears to be caused by the peak weathering and acid hydrolysis of the coarser fractions therein.
Only Si has accumulated in large amounts in the albic horizon.
It is possible that the albic horizon was then weaker and the epipedon was at least umbric.
Iron activity is higher in initial sand and in the albic horizon where the amount of amorphous substances is inconsiderable.