Incipient podzolization and weathering caused by complexation in a forest Cambisol on loess as revealed by a soil solution study

被引:24
作者
Brahy, V [1 ]
Titeux, H [1 ]
Delvaux, B [1 ]
机构
[1] Univ Catholique Louvain, Unite Sci Sol, B-1348 Louvain, Belgium
关键词
D O I
10.1046/j.1365-2389.2000.00324.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Surface podzolization has so far been diagnosed from morphological observations, selective extraction and mineralogical investigations. We studied this process in two Cambisol profiles developed in loess, one with a fibrimor humus and the other with a dysmoder humus, by characterizing the chemical composition and the complexing properties of the soil solution. The solutions were sampled bimonthly for 3 years at four depths (4, 8, 13, 25 cm) using both zero-tension and low-tension capillary-wick lysimeters. The leachates from the Ah horizon of the soil with fibrimor contained less nitrate, sulphate and calcium than those from the one with a dysmoder because there was less bioturbation and mineralization in it. Both the complexation capacity and the density of ligand binding sites were larger in the soil solutions of the Ah (4 cm) and AB (8 cm) horizons of the soil with the fibrimor. In this soil, the complexing properties of the liquid phase induced a depletion of inorganic monomeric aluminium. In this environment, the hydroxy interlayered 2:1 clay minerals lose their Al-interlayers and transform into vermiculite and smectite, which in turn weather, producing large amounts of magnesium in the soil solution. This was found to be a major characteristic of weathering by complexation and incipient podzolization in the Cambisol with the fibrimor. In this process, nitric acid probably contributes to mineral dissolution.
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页码:475 / 484
页数:10
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