土壌型と腐植の形態との関係に関する研究 (第3報) : 土壌層位による腐植の差違について

概要

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The nature and form of humic substance was studied with several genetic horizons of soils, from upland area, by means of titrating or colorimetric method after Simon's idea. The following results were got. 1) Both the ratio of acid soluble humus to total organic matter, and that of fulvic acid to acid-insoluble humus increased with the depth of horizon, while the ratio of acid-insoluble humus to total organic matter decreased 2) In podzolized soils, humus was least in A_2 horizon and seemed to be transported. B-type of humic acid was much in every horizon. 3) In volcanic ash soils accumulated with humus and designated as "Ando-soil", by U. S. soil survey, humic acid was of stable A-type and much in every horizon. No transportation of humic acid was observed. 4) In non-volcanic ash soil, not accumulated with humus and designated as "Red-yellow podzolic soils" by U. S. soil survey no transportation of humic acid was observed. In evety horizon humic acid was of unstable B-type.
社団法人日本土壌肥料学会の論文
1952-11-10