40 津軽半島ヒバ天然林地帯に出現するボドンールに就て : (第2報)腐植の形態

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In this paper the writer investigated the tvpes of humus after Simon's method, of iron podzol (two profiles) and glei podzol (one profile) found in the HIBA natural forest region on the Tsugaru Peniusula. The results are summarized as follows ; (1) Humus extracted from the surface layers (H layer and A horizon) of the podzolized soils using NaF or NaOH solution is generally composed of 60-80 per cent humic acid (rotted materials and true humic acid) and 40-20 per cent fulvic acid. So-called Simon's rotted materials extracted from the surface layers using NaOH indicates lower fumification values (HQ). but because of the fact that humification values (HQ) increase e tremely under acid-treatment (5 per cent hydrochloric acid), it is presumed that in our rotted materials humic acid combines with mineral colloid, consequently they have higher humification values (HQ). (2) There is a tendency that glei podzol contains a larger amount of humic acid to A_2 horizon but the degree of humification is lower as compared with iron podzol. (3) A_3 horizon of iron podzol clayey type is divided into two sub-horizons (A_<2-1>, A_<2-2>) but because of the fact that fulvic acid is leached from A_1 to A_<2-1>, it seems that in the podzolization of the clayey parent material the permeability being poor, primary accumulation is found on A_2horizon. (4) Humus extracted from the surface layer using alkali generally decreases owing to acid-treatment, but humic acid of glei podzol decreases little, and it is found that humic acid of iron podzol is in free state decause fulvic acid is reduced by half under acid-treatment.
日本森林学会の論文
1951-07-25

40 津軽半島ヒバ天然林地帯に出現するボドンールに就て : (第2報)腐植の形態

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