| Autor: |
Yerima, B. P. K., Calhoun, F. G., Senkayi, A. L., Dixon, J. B. |
| Zdroj: |
Soil Science Society of America Journal; March 1985, Vol. 49 Issue: 2 p462-466, 5p |
| Abstrakt: |
The mineralogy of six profiles from the Median Trough of El Salvador has been investigated. Most of these soils have vertic properties and are developed from Quaternary alluvium. The mineralogical evolution of these soils has been influenced by intermittent additions of a readily soluble source of silica and alumina in volcanic ash. Topographic position has influenced the internal drainage and degree of profile development in these soils. Smectite is the most abundant clay mineral in the dark gray, poorly drained soils which occur on <1% slopes. These pedons are characterized by high SiO2/Al2O3ratios (>1.0). Kaolinite predominates in the well drained dark brown soils on 2 to 14% slopes. Interstratified kaolinite‐smectite was only observed in moderately well drained profiles. The results obtained in this study further support the following weathering sequence: smectite → interstratified kaolinite‐smectite → kaolinite + iron oxides, which has been suggested by previous investigators. |
| Databáze: |
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