土壌型と腐植の形態との関係に関する研究(第5報) : ウロン酸について

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Uronic carbon in soils is ordinarily determined by boiling soils with 12% HCl. For this boiling, authors applied the apparatus for wet combustion method of carbon. Carbon dioxide evolved was introduced into U-tube, containing soda-lime, and weighed. (See Fig. 1) Of several soils, uronic carbon was determined to following results. 1) Of upland soils, the content of uronic carbon was not so changeable (0.5〜1.1%). In soils, rich in humus, the ratio of uronic carbon to total carbon was small.(See Table 2) The ratio increased with the depth of soil profile in all soil types except wet forest soil. In wet forest soil this ratio was smaller in B_2-G horizon. In podsolized soil, this ratio increased remarkably, when the depth reached to B_1 beyond A_2. (See Fig. 2) The distribution of uronic acid in each fraction of humus was as in Table 4 : i) in non-podsolized soil (named Owada) the ratio of uronic carbon to total carbon in acid soluble humus decreased with the depth of soil profile, while in fulvic acid and also in non alkali soluble humus increased, ii) in podsolized soil (named Jumonjitoge) the ratio in acid soluble humus only increased with the depth; by the comparison of i) to ii) uronic acid group was concluded to be formed in its existing place in the former soil, and to be accumulated in B horizon in the latter soil. 2) Of lowland soils, the ratio of above meaning was smallest in peat and seemed to be enlarged by the progress of drainage. (See Table 3) With depth of soil profile, the ratio decreased in Half-bog soil, not changed in subsoil in Meadow soil, and increased in Gray lowland soil. (See Fig. 3)
社団法人日本土壌肥料学会の論文
1953-10-01

土壌型と腐植の形態との関係に関する研究(第5報) : ウロン酸について

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