BEHAVIOR OF PHENOLIC SUBSTANCES IN THE DECAYING PROCESS OF PLANTS : VIII. Changes in the Quality and Quantity of Phenolic Substances in the Decaying Process of Rice Straw, Ladino Clover, and Red Oak Leaves

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概要

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• The behavior of phenolic substances in the decaying process of rice straw, ladino clover, and fallen leaves of red oak under moist conditions, and also of rice straw under various conditions were compared in the laboratory. The amounts of phenolic substances, divided into either humic acid and fulvic acid fractions, or ether-extractable, butanol-extractable and organic solvent-unextractable fractions, and the amounts of individual phenolic acids were periodically determined during incubation for 150 days. The following results were obtained. 1) The amounts and behavior of phenolic substances in various fractions differed considerably among the plant materials. The total amount of phenolic substances was remarkably larger in red oak leaves than in the others during the whole period of incubation. The amounts of phenolics in the fulvic acid fraction changed to a larger extent than those in the humic acid fraction during the decaying process of plant materials. The changes in total amount of phenolics in decaying red oak leaves and ladino clover were mainly due to changes in the level of relatively hydrophilic phenolics in the fulvic acid fraction, but the changes in decaying rice straw were mainly due to changes in the level of relatively lipophilic phenolics. 2) Rice straw and ladino clover, especially the former, contained large amounts of p-coumaric and ferulic acids, but these decreased rapidly in the early stage of the decaying process. The amounts in red oak leaves were small, but did not decrease markedly during incubation. 3) The changes in amounts of phenolics in both humic acid and fulvic acid fractions in the decaying process of rice straw were largely influenced by temperature, moisture, and pH, but not to a large extent by C/N ratio and the presence of soil. At higher temperatures under moist conditions, phenolic substances disappeared rapidly. Also, acidification of the system inhibited the degradation process.

• 社団法人日本土壌肥料学会の論文

著者

• Shindo Haruo

  Faculty of Agriculture, Yamaguchi University

• KUWATSUKA Shozo

  Faculty of Agriculture, Nagoya University

• Shindo Haruo

  Faculty Of Agriculture Nagoya University: (present Address) Faculty Of Agriculture Yamaguchi Univers

• Kuwatsuka Shozo

  Faculty Of Agriculture Nagoya University

• Shindo Haruo

  Faculty Of Agriculture Nagoya University

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