Abstract
Abstract Soil samples were collected from horizons H, A11, A18, AB, B1, B2 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 dar-colored fungi, and amount of Pg fraction (“green humic acid”) which contained in 0.1 N NaOH-extractacble humic acid. Iron and aluminum content in the humic acid was also determined after wet combustion of the humic acid with H2O2. 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 microorganisms. In addition, correlation between the Pg content (y) and the iron context (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 for...
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