Origin and Properties of Humus in the Subsoil of Irrigated Rice Paddies : III. Changes in Binding Type of Humus in Submerged Plow Layer Soil

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概要

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• Stability of humus in the plow layer soil is considered to affect the quantity and quality of dissolved organic matter leached from the plow layer soil. Therefore, a model experiment was conducted to analyze the effect of soil reduction under submerged conditions on the stability of humus in the plow layer soil. The changes in the stability of humus in the plow layer soil during submerged incubations with and without rice straw application were evaluated based on the changes in the binding type of humus. Binding type of humus in the plow layer soil was analyzed by successive extractions of organic matter with water, 0.25 M Na_2SO_4, 0.1 M Na_4P_2O_7 (pH 7.0), 0.1 M Na_4P2O_7 (pH 10.5), and 0.1 M Na_4P_2O_7 (pH 10.5) with NaBH_4. Amounts of Fe, Mn, and Mg in each fraction were also determined to estimate the relationships between humus and metals. The successive extraction of humus indicated that the amount of organic carbon which was extractable with the (NaBH_4+0.1M Na_4P_2O_7) solution decreased while that of the 0.1 M Na_4P_2O_7 (pH 7.0)-extractable organic carbon increased during submerged incubation with rice straw application. The origin of the increase in the amount of organic carbon in the Na_4P_2O_7 (pH 7.0)-extractable fraction during submerged incubation was investigated further by another incubation experiment using <13>^C-glucose as a reducing agent. Atom-<13>^C% analysis showed that the contribution of organic carbon derived from compounds other than glucose to the increase in the contents of humic acids and fulvic acids in the Na_4P_2O_7 (pH 7.0)-extractable fractions was Ca. 80%. Therefore, it was concluded that the binding type of humus changed from (NaBH_4+Na_4P_2O_7)-extractable to Na_4P_2O_7 (pH 7.0)-extractable humus under reducing conditions. Since the amounts of organic carbon and Fe increased in the Na_4P_2O_7 (pH 7.0)-extractable fraction and decreased in the (NaBH_4 +0.1 M Na_4P_2O_7)-extraetable fraction simultaneously, iron reduction was presumably associated with the change in the binding type of humus in submerged paddy soil.

• 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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