THE PROCESS OF MANGANESE DEPOSITION IN PADDY SOILS : I. A Hypothesis and Its Verification
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概要
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From the close examination of the process of Mn-deposition in the paddy soils, a hypothesis concerning the Mn-deposition was proposed. In this hypothesis, the process is divided into two stages (the initial stage and the later stage). In the initial stage Mn^<2+> is rapidly oxidized by microorganisms, forming tiny Mn-deposits. In the later stage, Mn^<2+> is slowly oxidized non-biologically on the surface of the tiny Mn-deposits and increases the size of the tiny Mn-deposits. To verify this hypothesis, models for the reduced plough layer which was exposed to the atmosphere by drainage were used. The number of Mn-deposits increased rapidly during the first 24 hr of incubation and remained almost unchanged afterwards. Toxic substances such as streptomycin, sodium azide, chloramphenicol, and antimycin suppressed the formation of the Mn-deposits during the first 24 hr of incubation. Microorganisms which were stained with MnO_2 were frequently recognized in the Mn-deposits. These results are thought to support the presumed biological oxidation of Mn^<2+> in the initial stage. The biological oxidation of Mn^<2+> was also found to be affected by several factors such as soil pH and Mn^<2+> content. The rate of the non-biological oxidation of Mn^<2+> in the later stage was confirmed to be very slow. Additional Index Words : Mn-oxidizing microorganism, Mn-mottling, micropedology, microbial ecology.
- 社団法人日本土壌肥料学会の論文
著者
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Kimura Makoto
School Of Agriculture Nagoya University
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Wada Hidenori
Faculty of Agriculture, The University of Tokyo
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Takai Yasuo
Nodai Research Institute,Tokyo University of Agriculture
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KIMURA Makoto
Faculty of Agriculture, The University of Tokyo
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TAKAI Yasuo
Faculty of Agriculture, The University of Tokyo
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SEIRAYOSAKOL Ashara
Faculty of Agriculture, The University of Tokyo
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Wada Hidenori
Faculty Of Agriculture The University Of Tokyo
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Takai Y
Nodai Research Institute Tokyo University Of Agriculture
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Takai Yasuo
Faculty Of Agriculture The University Of Tokyo
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Seirayosakol Ashara
Faculty Of Agriculture University Of Tokyo
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Kimura Makoto
Faculty Of Agriculture Kyushu University Graduate School
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