土壌型と腐植の形態との関係に関する研究(第1報) : 滴定法によるシモン法の応用について

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The nature of soil humus was studied by titration method after SIMON's idea. After the results the authors obtained the following conclusions. 1) B-type of humic acid (sol., in Mg-ion) predominated in podzolized brown forest soils, and A-type of humic acid (insol., in Mg-ion), on the contrary, in brown forest soils. 2) The soils of upland field in Japan, except podzolized brown forest soils, had always the tendency of the latter case. But the humus of these soils was observed to change its nature in somew hatbroad range depending upon the constituents in soils such as lime in A horizon, and sesquioxide as well as clay in B horizon. 3) The humus of soils of ground water soil type was inactive in general and had scarcely the nature of true humic acid. 4) In the valley-shaped areas caused by head erosion there existed always the dark-coloured soils of considerable depth. The humus of those soils was ascertained by the authors to be of similar nature to that of soils of upland fields (refer, to 2). The above similarity induced the authors to designate those soils as dark coloured colluvial soils.
社団法人日本土壌肥料学会の論文
1951-03-31