Abstract
In order to measure the metabolic rate of cellulose in forest soils, the cellulase activity in a Wet Humus Podzolic Soil (Pwh soil) (FAO/UNESCO: Humic Podzols, U.S. Soil Taxonomy: Humods) and in an Alpine Brown Forest Soil (BD soil) (FAO/UNESCO: Humic Cambisols, U.S. Soil Taxonomy: Haplumbrepts) at Mt. Shiga was analyzed as a part of the International Biological Program (IBP) carried out in Japan. 1) Cellulase activity was highest in the L horizon in the Pwh soil and in the F horizon in the BD soil, and it decreased with the increase of depth in the horizon. The F horizon of the Pwh soil where organic materials were thickly deposited was divided into an upper portion (F1), middle portion (F2), and lower portion (F3), and the cellulase activity was measured. The activity in the F1 layer located immediately below the L horizon was very high and far higher than in the L horizon. The activity in the F horizon decreased also with the increase of depth in the horizon. The values of the cellulase activity with c...
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