Surface podzolization in Cambisols under deciduous forest in the Belgian loess belt
Identifieur interne : 000E72 ( Main/Exploration ); précédent : 000E71; suivant : 000E73Surface podzolization in Cambisols under deciduous forest in the Belgian loess belt
Auteurs : V. Brahy [Belgique] ; H. Titeux [Belgique] ; A. Iserentant [Belgique] ; B. Delvaux [Belgique]Source :
- European Journal of Soil Science [ 1351-0754 ] ; 2000-03.
Abstract
Surface podzolization involves the migration of metal–humus complexes to a depth of a few centimetres. In acid soils derived from loess, this process has been diagnosed mainly by morphological observation. We investigated this process in a toposequence of Luvisols and Cambisols on loess using selective extraction and mineralogical data as well as characteristics of the leaf litter. The humus type (O and OAh horizons) is a moder in the three Luvisols and one of the Cambisols, whereas it is a fibrimor in the two other Cambisols. The contents in total alkaline and alkaline‐earth cations range from 35 to 60 cmolc kg−1 in the fibrimor and from 40 to 90 cmolc kg−1 in the moder humus. In the two Cambisols with fibrimor smectite occurs in the clay fraction of the Ah horizon; Fe–humus complexes seem to have moved, but no more than 9 cm, from the Ah to the AB horizon beneath. Relative to the Ah horizon, the upper part of the AB has larger tetraborate‐extractable Fe/Al ratio and optical density of the oxalate extract. Such features converge to diagnose surface podzolization in the Cambisols with fibrimor. However, they were not detected in the Cambisol and Luvisols with moder. In the two Cambisols with fibrimor, surface podzolization is consistent with (i) their smaller iron content, (ii) their more advanced weathering stage and (iii) their lower acid neutralizing capacity.
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DOI: 10.1046/j.1365-2389.2000.00287.x
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In acid soils derived from loess, this process has been diagnosed mainly by morphological observation. We investigated this process in a toposequence of Luvisols and Cambisols on loess using selective extraction and mineralogical data as well as characteristics of the leaf litter. The humus type (O and OAh horizons) is a moder in the three Luvisols and one of the Cambisols, whereas it is a fibrimor in the two other Cambisols. The contents in total alkaline and alkaline‐earth cations range from 35 to 60 cmolc kg−1 in the fibrimor and from 40 to 90 cmolc kg−1 in the moder humus. In the two Cambisols with fibrimor smectite occurs in the clay fraction of the Ah horizon; Fe–humus complexes seem to have moved, but no more than 9 cm, from the Ah to the AB horizon beneath. Relative to the Ah horizon, the upper part of the AB has larger tetraborate‐extractable Fe/Al ratio and optical density of the oxalate extract. Such features converge to diagnose surface podzolization in the Cambisols with fibrimor. However, they were not detected in the Cambisol and Luvisols with moder. In the two Cambisols with fibrimor, surface podzolization is consistent with (i) their smaller iron content, (ii) their more advanced weathering stage and (iii) their lower acid neutralizing capacity.</div></front></TEI><affiliations><list><country><li>Belgique</li></country><region><li>Vienne (Autriche)</li></region><settlement><li>Vienne (Autriche)</li></settlement><orgName><li>Université catholique de Louvain</li></orgName></list><tree><country name="Belgique"><region name="Vienne (Autriche)"><name sortKey="Brahy, V" sort="Brahy, V" uniqKey="Brahy V" first="V." last="Brahy">V. Brahy</name></region><name sortKey="Delvaux, B" sort="Delvaux, B" uniqKey="Delvaux B" first="B." last="Delvaux">B. Delvaux</name><name sortKey="Iserentant, A" sort="Iserentant, A" uniqKey="Iserentant A" first="A." last="Iserentant">A. Iserentant</name><name sortKey="Titeux, H" sort="Titeux, H" uniqKey="Titeux H" first="H." last="Titeux">H. Titeux</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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