Origin and Properties of Humus in the Subsoil of Irrigated Rice Paddies : I. Leaching of Organic Matter from Plow Layer Soil and Accumulation in Subsoil

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概要

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• A pot experiment was conducted to estimate the amount of dissolved organic carbon (DOC) leached from the submerged plow layer of rice paddies during the cultivation period and its accumulation in the subsoil. Organic matter in the leachate was fraetionated using insoluble polyvinylpyrrolidone (PVP) which can adsorb aromatic components having hydroxyl and/or carboxyl groups. Total amount of DOC leached throughout the growth period of rice plant corresponded to ca. 0.5% of total-C in the plow layer soil sample (total C, 17.8 g kg^<-1>) irrespective of the presence of rice plant, and the PVP-adsorbed fraction accounted for 34-43% of it. The amount of DOC in the leachate decreased by more than 50%, and that of the PVP-adsorbed and non-adsorbed fractions decreased by 79-82 and 45-47% by passing through the subsoil packed in the glass columns, respectively. The decreases were considered to be due to the adsorption to the subsoil, since a corresponding increase was observed in the total carbon content in the subsoil. Successive extraction of organic matter from the subsoil before and after the rice growth period with water, 0.25_M Na_2SO_4 and 0.1_M Na_4P_2O_7 (pH 7.0) solutions showed that the amount of organic carbon adsorbed on PVP mainly increased in the Na_4P_2O_7 (pH 7.0)-extractable fractions during the rice growth period, while the amount of organic carbon non-adsorbed on PVP increased in all the fractions extracted. These results suggested that the PVP-adsorbed fractions in the leachate were adsorbed to the subsoil mainly by coordinate bonding while the PVP-non-adsorbed fractions were adsorbed by physical adsorption, weak hydrogen bonding, ion bonding, and coordinate bonding.

• 社団法人日本土壌肥料学会の論文

著者

• KIMURA Makoto

  Laboratory of Structural Biology, Graduate School of Systems Life Sciences, Kyushu University

• Watanabe A

  Nagoya Univ. Nagoya Jpn

• Kimura M

  Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi

• Maie Nagamitsu

  Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer

• Watanabe Akira

  Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer

• Maie Nagamitsu

  Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi

• Ardjasa W

  Research And Assessment Installation For Agriculture Technology

• Watanabe A

  Research Division For Development Of Anti-infection Agents Institute Of Development Aging And Cancer

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Graduate School Faculty Of Agr

• Watanabe Akira

  Laboratory Of Radiation Biology Faculty Of Science University Of Tokyo:(present) Research Institute

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Agricultural Chemistry Faculty And Graduate School Of Agric

• Watanabe Akira

  Laboratory Of Bioindustrial Genomics Graduate School Of Agricultural Science Tohoku University

• Watanabe Akira

  Laboratory Of Bioindustrial Cenomics Graduate School Of Agricultural Science Tohoku University

• KIMURA Makoto

  Laboratory for Remediation Research, Plant Science Center, RIKEN

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