CHARACTERISTICS OF BURIED HUMIC HORIZONS AT THE SHIIJI ARCHAEOLOGICAL PITS : III. Carbon, Nitrogen, Aluminium, Silicon, Iron, Phenol and Amino Acid Contents in Humic and Fulvic Acids

概要

論文の詳細を見る
Using the surface horizon and buried humic horizons, derived from volcanic ash aged 0 to about 26,000 YBP, the carbon, nitrogen, Al, Si, Fe phenol and amino acid contents of the humic and fuvic acids successively extracted with NaOH and Na_4P_2O_7 (SPP) were determined. The sequential changes of the above mentioned components of humic horizons after burial with time, can be tentatively described as follows : 1) The humic and fuvic acid of the "free form" were decomposed and/or transformed into the "combined form" or humin. It was easier for fulvic acid to be changed to the "combined form" than for humic acid. 2) Organic nitrogenous components in the humic acids of the "free form" were changed more quickly to the "combined form" than the organic non-nitrogenous components, and the reverse was true for fulvic acids. 3) Binding between Al and humus in Al-humus complexes becams stronger, and Al became less extractable with alkali and more extractable with SPP. 4) The contents of non-humic substances such as hydrolyzable phenols and amino acids as well as hexoses and uronic acids decreased.
社団法人日本土壌肥料学会の論文