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Abstract
A podzolic soil developed under a Sciadopitys verticillata forest on the side of Mt. Irazu in Shikoku mountains, Southwest Japan was investigated mainly by a clay-mineralogical method. The results are summarized as follows: This soil was a Haplic Podzol based on a comparison with the classification by WRB. Its parent materials consisted mainly of volcanic ash refered to as Akahoya tephra, which was confirmed by the presence of abundant bubblewall type volcanic glass. In the E horizon, smectite was dominant, and small amounts of mica- smectite interstratified minerals and kaolin minerals were also present. In the Bs and Be horizons, considerable amounts of chlorite-vermiculite intergrade and free sesquioxides were detected, and the presence of imogolite was noticed. Small amounts of kaolin minerals and allophane were also present in the B horizons. The clay mineral composition of this Podzol was almost similar to the characteristics of other Podzols and podzolic soils although small amounts of imogolite and allophane were found in the B horizons. Moreover, the influence of eolian dust on the mineral composition in this Podzol was considered based on the presence of abundant crystalline clay minerals.