STUDIES ON THE HUMUS FORMS OF FOREST SOILS : II. The Humus Composition of Fractionated Horizons of Higashiyama Soil
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概要
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Samples described in the previous paper were analyzed for humus composition by the method of Kumada et al., elementary composition of humic acids, nitrogen distribution among humic acid, fulvic acid, and humin, and organic matter composition by the modified Waksman method. The samples obtained by physical fractionation fro each horizon of Higashiyama soil were as follows : f_1 and f_2 from the L layer, f_1,f_2,and f_3 from the F layer, f_1,f_2,sand, silt, and clay fractions from the H-A and A horizons.With the progress of decompostion, the following tendencies were rather clearly observed.The extraction ratio of soluble humus, amounts of humic acid and fulvic acid, and PQ value tended to increase with some exceptions. The degree of humification of humic acid proceeded. Most humic acids belonged to the Rp type, but those of the clay fractions belonged to the B type.As for the elementary composition of humic acid, transitional changes from the Lf_1 to the clay fractino of the A horizon were observed. But differences in elementary composition among humic acids were far less, compared with those among whole fractions.Nitrogen contents in humic, fulvic, and humin fractions increased with the progress of decomposition and humification, and the largest relative increase was found in fulvic acid nitrogen.According to the modified Waksman's method, the amounts of residues and protein increased, while the total amounts of each extract, except for the HCl extract, and the amounts of sugars and starch, phenolic substances, hemicelluloses and pectin, and cellulose decreased. Sugars and starch comprised only a small portion of the hot water extract, and polyphenolic substances comparable to sugars and starch were also found in the extract. Hemicelluloses and pectin accounted for only about one-half of the HCl extract. Several characteristic differences in the elementary composition of extracts and residues were found.Pheopigments existed in benzene-ethanol extracts and their amounts seemed to decrease from Lf_1 to Ff_3.
- 社団法人日本土壌肥料学会の論文
著者
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Ohta Seiichi
Faculty Of Agriculture Nagoya University
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KUMADA Kyoichi
Faculty of Agriculture, Nagoya University
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Kumada Kyoichi
Faculty Of Agriculture And Water Research Institute Nagoya University
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