EASILY DECOMPOSABLE ORGANIC MATTER IN PADDY SOIL : IV. Relationship between Reduction Process and Organic Matter Decomposition

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概要

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• We have investigated quantitative relationships between the microbial decomposition of soil organic matter and the oxidation-reduction reactions in the submerged soils which are affected by soil temperature. Seven soil samples of manured and non-manured plots with varying contents of organic matter, active iron, active Mn, etc. were used either after air-drying or without air-drying. They were incubated anaerobically in truncated syringes for 12 weeks at 15, 20, 30, and 40℃, and Eh as well as the contents of Fe(II), Mn(II), volatile fatty acids (VFA), dissolved gaseous components (CO_2, CH_4, N2, N2O, and O_2+Ar) and sulfides were determined. Air-drying pretreatment and high incubation temperature were found to enhance the development of the reduction state in the submerged soils. Both Mn(II) and Fe(II) contents increased rapidly and reached maximum levels which did not change afterwards. These maximum values were specific for each soil and were not affected by either the incubation temperature or the air-drying pretreatment, which indicates that the amounts of biologically reducible Mn-oxides and Fe-oxides were characteristic for each soil. VFA accumulated temporarily and then disappeared when active CH_4-formation started. The amount of VFA was fount to be large in the air-dried soil of manured plots incubated at 40 for 4 weeks. The following quantitative relationships were recognized: 1) Rapid decomposition of organic matter in the early period of incubation was mainly associated with Fe(II) formation (66-84%). 2) Gradual decomposition of organic matter in the later period of incubation was associated with VFA and CH_4-formation (53-74%). 3) The same substrates may be utilized for both CH_4-formation and SO^<2->_4-reduction. On the basis of the relationship between Fe(II) formation and the amount of total organic carbon, it was inferred that soil organic matter was composed of two fractions; one susceptible to manuring and the other not affected by manuring.

• 社団法人日本土壌肥料学会の論文

著者

• Inubushi Kazuyuki

  Faculty Of Horticulture Chiba University

• Inubushi Kazuyuki

  Faculty Of Agriculture The University Of Tokyo

• Inubushi K

  Faculty Of Horticulture Chiba University

• Takai Y

  Univ. Tokyo Tokyo Jpn

• Wada Hidenori

  Faculty of Agriculture, The University of Tokyo

• TAKAI Yasuo

  Faculty of Agriculture, The University of Tokyo

• Wada H

  Univ. Tokyo Tokyo Jpn

• Wada Hidenori

  Faculty Of Agriculture The University Of Tokyo

• Takai Yasuo

  Faculty Of Agriculture The University Of Tokyo

• Inubushi Kazuyuki

  Department Of Bioproduction Sciences Faculty Of Horticulture Chiba University

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