WEATHERING OF LIPARITIC-WELDED TUFF : Volumetric Research of Weathering

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概要

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• The degree of chemical weathering has been calculated from chemical analytical data on an Al_2O_3 base, but the author used quartz insted of Al_2O_3 because the state of Al_2O_3 is not constant. As an example, he used a soil profile derived from biotite-liparitic-welded tuff from Mt. Tokachi at Biei Tw. and studied it genetically. He decided it belonged to acid brown forest soil. The plagioclase content diminishes towards the surface but 14 and 7A minerals increase and are more obvious in the upper profile than in the A/B horizon. The volume change of each horizon in consequence of soil genesis was calculated by volume density and quartz content and the results indicated that the surface horizon and B horizons to 2.7 and 1.5-1.6 times the volume of the parent material, respectively. Recalculation of the data of the chemical analysis taking volume change into consideration showed some tendency towards teh eluviation of the combined SiO_2 in the A horizon. The author would consider this phenomenon as lessivage.

• 社団法人日本土壌肥料学会の論文

著者

• Sasaki Seiichi

  Faculty Of Agriculture Hokkaido University

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• UPTAKE OF CALCIUM AND MAGNESIUM BY BUCKWHEAT FROM LIMESTONE
• WEATHERING OF LIPARITIC-WELDED TUFF : Volumetric Research of Weathering

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