Origin and Properties of Humus in the Subsoil of Irrigated Rice Paddies : II. Effects of Subsoil Constituents and Drainage on the Accumulation of Organic Matter Leached from the Plow Layer Soil
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概要
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To study the accumulation mechanism of dissolved organic carbon (DOC) leached from the plow layer soil in the subsoil of irrigated rice paddies, leaching experiments using a series of plow layer soil columns and subsoil columns were conducted. The binding types of organic matter in the subsoil columns were estimated by successive extraction of organic matter with water, Na_2SO_4, Na_4P_2O_7 (pH 7.0), Na_4P_2O_7+NaOH, and NaOH solutions. The ability of the subsoil constituents to adsorb DOC was investigated by removing them. Successive removal of indigenous organic matter and iron oxides and hydroxides from the subsoil samples decreased the adsorption of DOC to the subsoil column. The decrease appeared in the Na_2SO_4- and Na_4P_2O_7 (pH 7.0)-extractable fraction for the organic matter removed subsoil column (Org.(-) subsoil column) and in the Na_4P_2O_7 (pH 7.0)-extractable fraction for the organic matter and iron respectively, suggesting the importance of polyvalent eations in the subsoil and in the leachate for binding DOC to the subsoil. The effect of drainage on the accumulation of DOC was investigated in the case three repetitions of leaching incubation followed by stand incubation with or without drainage. The sum of the amounts of DOC retained in the subsoil columns during the 3 periods of leaching incubation was larger in the treatment with drainage than in the treatment without drainage. Since the net increase in the total organic carbon content in the subsoil columns was less pronounced in the treatment with drainage than in the treatment without drainage (untreated subsoil columns), or similar between the two treatments (Org.(-) subsoil columns), the drainage was assumed to promote the adsorption of DOC to the subsoil, and also to promote organic matter decomposition. In the treatment with drainage, Na_4P_2O_7 (pH 7.0)-extractable organic carbon mainly accumulated. Drainage also resulted in the impossibility of extracting water-extractable organic carbon with water, and promoted the formation of humin.
- 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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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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