Origin and Properties of Humus in the Subsoil of Irrigated Rice Paddles : IV. Effect of Water Percolation on the Binding Type of Humus in a Submerged Plow Layer Soil
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概要
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To examine the effect of downward percolation of flooding water under reduced soil conditions on the binding type of humus in the plow layer soil of paddy fields, a model experiment was conducted. Changes in the binding type of humus were analyzed by successive extraction of humus with water, 0.25 M Na_2SO_4,0.1 M Na_4P_2O_7 (pH 7.0), 0.1 M Na_4P_2O_7 (pH 10.5), and 0.1 M Na_4P_2O_7 (pH 10.5) with the addition of NaBH_4. The amount of humus in the Na_2SO_4-and Na_4P_2O_7 (pH 7.0)-extractable fractions increased during the incubation. Since only the amount of Na_4P_2O_7 (pH 7.0)-extractable humus increased during flooded incubation without percolation (Maie et al. 1998 : Soil Sci. Plant Nutr., 44,331-345), it was concluded that water percolation as well as the development of reducing soil conditions was essential for the increase in the solubility of humus in soil water. Humic acids, (HAs) that leached from the plow layer soil accounted for less than 0.7% of dissolved organic matter in the leachate and almost all of them belonged to Type Rp. Thus, HAs with a high humification degree, which were extractable with Na_4P_2O_7 (Maie et al. 2000 : Soil Sci. Plant Nutr., 46,163-175) were not Reached from the plow layer soil with percolation even after the development of reduced soil conditions.
- 社団法人日本土壌肥料学会の論文
著者
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KIMURA Makoto
Laboratory of Structural Biology, Graduate School of Systems Life Sciences, Kyushu University
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Watanabe A
Nagoya Univ. Nagoya Jpn
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Kimura M
Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi
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Maie Nagamitsu
Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer
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Watanabe Akira
Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer
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Maie Nagamitsu
Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi
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Ardjasa W
Research And Assessment Installation For Agriculture Technology
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Watanabe A
Research Division For Development Of Anti-infection Agents Institute Of Development Aging And Cancer
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Kimura Makoto
Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Graduate School Faculty Of Agr
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Kimura Makoto
Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Faculty Of Agriculture Graduat
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Watanabe Akira
Laboratory Of Radiation Biology Faculty Of Science University Of Tokyo:(present) Research Institute
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Kimura Makoto
Laboratory Of Biochemistry Department Of Agricultural Chemistry Faculty And Graduate School Of Agric
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Watanabe Akira
Laboratory Of Bioindustrial Genomics Graduate School Of Agricultural Science Tohoku University
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Watanabe Akira
Laboratory Of Bioindustrial Cenomics Graduate School Of Agricultural Science Tohoku University
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KIMURA Makoto
Laboratory for Remediation Research, Plant Science Center, RIKEN
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