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Registros recuperados: 34 | |
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Lorenzoni, P.; Quantin, Paul; Spadoni, M.. |
In the sedimentary basin of Rieti (Central Italy) a Mollic Fragiudalf was studied in order to verify, through the analysis of differential dissolution kinetics of Si and Al, wether the presence of this two elements could be involved in determining the fragic characters of its deep horizons. The reuslts of the main physico-chemical analysis confirmed the fragic features of the deep horizons Bt3x and Ctgx which have been already observed in the field study. Differential dissolution of Si and Al was performed using 0,5 N NaOH at 25°C, and the values of silica and alumina obtained after each of ten consecutive extractions were cumulated to trace the cumulative curves of dissolution. Slope changes of the curves, which indicate changes in dissolution rate,... |
Tipo: Text |
Palavras-chave: CENDRE VOLCANIQUE; HORIZON; ALUMINIUM; SILICE; MINERALOGIE; PYROCLASTITE; FRAGIPAN. |
Ano: 1997 |
URL: http://www.documentation.ird.fr/hor/fdi:010012917 |
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Shoji, S.; Nanzyo, M.; Dahlgren, R.A.; Quantin, Paul. |
The proposed criteria for andosol classification in the World Reference Base (WRB) of Soil Resources were evaluated using the Tohoku University World Andosol Database (TUWAD). The WRB proposal defines a diagnostic andic horizon comprised of vitr-andic, alu-andic, and sil-andic subtypes, and eight second level soil units. Several notable refinements to the WRB criteria were apparent from evaluation of soil properties from TUWAD and are proposed as revised criteria. Our analysis indicated that the most effective criteria for differentiating the andic horizon were glass content, phosphate retention, oxalate extractable Al and Fe, pyrophosphate-extractable Al, and bulk density. The vitr-andic horizon is distinguished by its low degree of weathering, evident... |
Tipo: Text |
Palavras-chave: SOL; TYPOLOGIE; CLASSIFICATION; PEDOGENESE; APTITUDE DU SOL; CARACTERISTIQUE CHIMIQUE; ALUMINIUM; SILICE; ANDOSOL. |
Ano: 1996 |
URL: http://www.documentation.ird.fr/hor/fdi:010007516 |
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Registros recuperados: 34 | |
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