Some physical properties of the reddish and yellowish soils in Matsue and vicinity

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  • 松江地方赤黄色土の学理的性質
  • 松江地方赤黄色土の理学的性質
  • マツエ チホウ セキ キイロド ノ リガクテキ セイシツ

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In this paper were studied the effects of the grain size of parent material on the physical proprties of soils in course of soil maturing.<br> The samples were collected from immature reddish and yellowish soils in the vicinity of Matsue city derived from the Tertiary and Quaternary sedimentary rocks.<br> To serve for this purpose comparisons were made chiefly between the sandy textured Upper-Matsue formation Soil derived from the sand stone in the Tertiary period and the clayey textured Kawatsu formation Soil derived from the basaltic tuff in the identical period.<br> 1. Although decrease in the volume weight, that is, increase in the pore volume of the soil could be acknowledged to occur in progress of maturing, the proportion of small pore volum differs much in different grain size of parent material in the present stage of soil maturing.<br> In the Upper-Matsue formation soil whose coarse particles can hardly contribute to aggregate formation the decrease in volume weight seems to be caused almost only by loosenning of the compactness of the soil, resulting in the superior increase in the large pore, i. e. the decrease in Mmax./P.<br> In the fine grained Kawatsu formation Soil which is apt to form aggregate another agent responsible for the decrease in volume weight is larger increase of small pores, compared with that of large ones, especially after a certain degree of soil maturing. These two agents compensate each other and the correlation between volume weight and Vmax./P were not so highly significant in the Kawatsu than in the Upper Matsue Soils.<br> 2. Compaction by impacts of the air-dried reddish and yellowish immature soils could not bring their volume weight as large as that in the natural conditions.<br> It differs so much from the cases of other soils that it could be one of an index of immatureness and gives an important suggestion for the forest management in this district.<br> 3. According to the data concerning the well matured soils of the natural Sugi (Crypomeria japcnlea) forests at the northern part of Akita Prefecture surveyed by IBARAGI and others, grain size of the parent rock could not have influences on the relative proportion of large to small pore volume of soils.

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