DISTRIBUTION PATTERNS OF PG FRACTION OF P-TYPE HUMIC ACID AND IRON IN A DARK BROWN FOREST SOIL
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概要
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Soil samples were collected form horizons H, A_<11>, A_<12>, AB, B_1, B_2 of a dark brown forest soil on a steep slope near the top of Mt. Kumotori (2,018 m) in Okutama district, Tokyo Metropolis. The moist soil samples were fractionated according to the particle size. Each size fraction was analysed for organic carbon, the number of sclerotia, the length of hyphae of dark-colored hungi, and amount of Pg fraction ("green humic acid") which contained in 0.1 _N Na OH-extractable humic acid. Iron and aluminum content in the humic acid was also determined after wet combustion of the humic acid with H_2O_2 and HNO_3. The distribution patterns of the Pg fraction among the horizons and among the size fractions suggested that the Pg fraction is formed in the plant debris partially decomposed by micro-organisms. In addition, correlation between the Pg content (y) and the iron content (x) could be expressed by the formula : y=11.2x+0.12 (r=0.95, n=25). From these considerations it was assumed that the Pg fraction was formed in plant debris in each horizon and most of the Pg was formed in the surface soil while part of Pg was translocated downward by percolating water and stabilized by combining with iron.
- 社団法人日本土壌肥料学会の論文
著者
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Wada Hidenori
Faculty of Agriculture, The University of Tokyo
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TAKAI Yasuo
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 Yasuo
Faculty Of Agriculture The University Of Tokyo
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Takai Yasuo
Faculty Of Agriculture University Of Tokyo
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NAKABAYASHI Kazushige
Faculty of Agriculture, University of Tokyo
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Nakabayashi Kazushige
Faculty Of Agriculture The University Of Tokyo
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Nakabayashi Kazushige
Faculty Of Agriculture University Of Tokyo
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Wada Hidenori
Faculty Of Agriculture University Of Tokyo
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