Clay Mineralogy of a Podzol Developed under a Sciadopitys verticillata Forest on Mt. Irazu, Shikoku Mountains, Southwest Japan(Soil Chemistry and Mineralogy)

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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 bubble-wall type volcanic glass. In the E horizon, smectite was dominant, and small amounts of mica- smectite interstratifled minerals and kaolin minerals were also present. In the Bs and BC 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.
社団法人日本土壌肥料学会の論文