Studies on the properties of organic matter in buried humic horizon derived from volcanic ash

Yoshida, Masao; Kumada, Kyoichi

doi:10.1080/00380768.1979.10433161

Cited by 16 publications

(15 citation statements)

References 6 publications

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“…These results are similar to those of YosHIDA et a/. (6) who reported that the humification of 'free' humic acid progressed with increasing age until 4,000-5,000 YBP while that of 'combined' humic acid progressed with age until around 7,000 YBP, and the difference in humificationdegree of 'free' and 'combined' humic acid with an age of about 15,000 YBP to 28,000 YBP became smaller. 0HTSUKA (4) reported that the humification-degree of 'free' humic add was different in the Upper, Middle and Lower layers, and stated that this difference was due to 'biological' activity in the period of the latter half of the post glacial for the Middle layer, and that in the period of the latter half of the SpatwUrm glacial for the Lower layer.…”

Section: Methods Of Analysissupporting

confidence: 81%

Characteristics of buried humic horizons at the Shiiji archeological pits

Sakai

Sakagami

Hamada

et al. 1982

Soil Science and Plant Nutrition

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Section: Methods Of Analysissupporting

confidence: 81%

Characteristics of buried humic horizons at the Shiiji archeological pits

Sakai

Sakagami

Hamada

et al. 1982

Soil Science and Plant Nutrition

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“…In a previous paper (1), some results of the analysis of the humus composition of buried humic horizons and surface horizons from 28,000 years B.P. to the present were reported.…”

mentioning

confidence: 99%

“…Soil samples. Soil samples of Yubunebara (Yu 1, 3, 4, 5, 6 and 7) and Ashitaka (At 1,2,3,4 and 5) reported in the previous paper (1) were used.…”

mentioning

confidence: 99%

Studies on the properties of organic matter in buried humic horizon derived from volcanic ash

Yoshida

Kumada

1979

Soil Science and Plant Nutrition

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“…Changes in the sugar components of soil organic matter in buried humic horizons derived from volcanic ash have been used as a means of studying the effects of time on the process of humification of organic matter by HAMADA et a/. (2) and YOSHIDA and KUMADA (3).…”

mentioning

confidence: 99%

Characteristics of buried humic horizons at the shiiji archeological pits

Sakai

Sakagami

Hamada

et al. 1982

Soil Science and Plant Nutrition

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Changes of sugar components (hexose and uronic acid) with time were determined in surface and buried horizons derived from volcanic ash with an age from the present to 27,200 YBP. The percentages of hexose carbon and uronic acid carbon in acid hydrolysates of the soils to the total carbon of the soils were generally low, ranging from 3.60 to 6.80% and O.S9 to 1.43%, respectively.Humic and fulvic acids were extracted with 0.1 N NaOH and 0.1 N Na,P 1 0, and their hexose and uronic acid contents were determined with (humic acid) and without (fulvic acid) hydrolysis. The relationships between the hexose contents and RF values of the humic acid indicated that the higher the humification-degree of A type humic acid, the greater were the amounts of hexose in the humic acid. A highly significant correlation was found between the hexose and uronic acid contents in the fulvic acid and the fulvic acid contents. The cor· relation between age and U/H values of the fulvic acids indicated that the changes in the sugar components with time were more clearly apparent in the Na,P 1 0 7 extracts than in the NaOH extracts, and that carboxyl groups of the sugar components in the fulvic acid extracted with Na,P 1 0 7 increased with time. Analyses of the sugar components in 75% ethanol precipitates from the fulvic acid extracts showed a similar tendency to that in the fulvic acid extracts.

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Studies on the properties of organic matter in buried humic horizon derived from volcanic ash

Cited by 16 publications

References 6 publications

Characteristics of buried humic horizons at the Shiiji archeological pits

Characteristics of buried humic horizons at the Shiiji archeological pits

Studies on the properties of organic matter in buried humic horizon derived from volcanic ash

Characteristics of buried humic horizons at the shiiji archeological pits

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