土壌型と腐植の形態との関係に関する研究(第4報) : 次亜沃素酸法(Hypoiodite Method)について

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Hypoiodite method, proposed by Norman and modified by Moodie, was observed to be a suitable procedure to trace the process of soil humification. But as the hypoiodite method seemed to be considerably governed by the change of room temperature, experiments, here reported, were devised to be accomplished at 30℃. (See Fig. 1) Of each genetic soil horizon, activity index after Moodie, denoted by miligram equivalent of I_2 utilized by one gram of carbon from soil organic matter, was ascertained as follows : Of upland soil the activity index was, in general, high in A. The index was minimum in A_2 and became higher in B, when podzolized. But, on the contrary, the index became lower toward subsoil, when non-podzolized. (See Table 1 and Fig. 2) The causes of above inclinations may be explained by an increase of acid soluble humus of higher index toward subsoil and also much humus of lower index (humin) in A_2 for the former, and by each fraction of humus having lower index toward subsoil for the latter. (See Table 2) Of lowland soils the activity index increased with depth in peat and muck soils. But, the index of subsoils, in these soils, had an inclination to decrease with the progress of drainage. In lowland soil types, gray and brown, the activity index decreased, on the contrary, toward subsoil. (See Table 3 and Fig. 3) We used the activity index of humic acid extracted from soils, for it showed more clearly the characteristics of soils than the activity index of original soils. Of each humic acid from soils, the activity index had following inclinations. 1) Of upland soils, the activity index of humic acid was always low in those of having comparatively a higher amount of A-type humic acid soluble in Na-oxalate, consequently, the index was highest in the soils from NIHONDAIRA, humic acid of which was B-type alone, became lower with the decrease of B-type humic acid in the soil and attained minimum in KATAJI soils of Onji type (See Table 4 and 5) 2) Of lowland soils, the activity index was highest in peat, and became lower with the progress of drainage. Humification seemed not to be promoted in lowland than in upland. (See Table 6 and 7) In general, the activity index is considered to decrease with the progress of humification and, thus, humus seems to get a stable feature.
社団法人日本土壌肥料学会の論文
1953-07-20

土壌型と腐植の形態との関係に関する研究(第4報) : 次亜沃素酸法(Hypoiodite Method)について

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