DEGRADATION AND STABILIZATION OF HUMUS IN BURIED VOLCANIC ASH SOILS : I. Humus Composition, Molecular Size Distribution of Humic Acids, and Sugar Composition of Soils
スポンサーリンク
概要
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Changes in the characteristics of the humus of buried volcanic ash soils were investigated in relation to the soil age attaining up to 30,000 YBP. With increasing soil age, the ratios of humin C/total C and Na_4P_2O_7-extractable C/NaOH-extractable C increased. The initial decrease of the ratio of sugar C/total C in the recent layers (< 10,000 YBP) was followed by the increase in this ratio in the buried layers older than 10,000 YBP. These phenomena suggested that the humus and polysaccharides of buried volcanic ash soils are stabilized in bound forms with mineral components. The treatment of the Na_4P_2O_7-extracted residue with NaBH_4 solubilized the HA exhibiting an intense visible absorption of Pg. The molecular size of HA increased in the recent layers with age, but partially decreased in the buried layers. It is inferred from these results that the decomposition of the easily decomposable organic components and the formation of humic substances took place in the recent layers, while the decomposition of unprotected humic substances proceeded in the buried layers.
- 社団法人日本土壌肥料学会の論文
著者
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KUWATSUKA Shozo
Faculty of Agriculture, Nagoya University
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Tsutsuki Kiyoshi
Faculty Of Agriculture Nagoya University
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