土壌薄片の顕微鏡観察による土壌間ゲキの研究

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タイトル別名
  • Studies on Soil Pores through Microscopical Observation of Thin Sections
  • ドジョウ ハクヘン ノ ケンビキョウ カンサツ ニ ヨル ドジョウ カン ゲキ ノ ケンキュウ カントウ ローム ト バンタハラ セキ キイロド

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This study was aimed at clarifying the forms and structures of soil pore through microscopical observation of thin sections.<BR>The, soil used in the study was sampled in the following four sites:<BR>1) The, Iwatagahara red-yellow soil (S. U.)<BR>2) The Kano Loam volcanic ash soil (Southern part of the Kanto district...A. U.)<BR>3) The Kano Loam (Southern part of the Kanto district...T. U.)<BR>4) The Kanto Loam (Northern part of the Kanto district...U. U.)<BR>The samples were transformed into thin sections after being coagulated with canada balsam. And microscopic photographs were taken of the thin sections to study the nature of soil pores (Photos 1-4).<BR>Both surface soil and subsoil of the Iwatagahara red-yellow soil has massive structures. The total area of macro pores which are larger than 0.1 milimeter occupied only a few percent of the entire area. The total area of micro pores smaller than 0.1 milimeter in diameter was 40-50 percent of the entire area. This ratio is smaller than in the case of the Kano Loam. Crystalline Minerals of this sample is featured by the presence of a large amount of fine ones.<BR>The Kano Loam is of aggregate type in the surface soil but as it goes down to the subsoil it turns to be of massive structure. The percentage of the total area of macro pores is bigger than that of the Iwatagahara red-yellow soil. So is the percentage of the total area of micro pores. Kanto Loam contains a very little amount of fine crystalline minerals.<BR>A check into the change of soil pore revealed that in the case of non-volcanic ash soil cultivation breaks up the compact structure of subsoil changing surface soil into porous structure. In the case of volcanic ash soil, cultivation would rather make the surface soil structure compact, because the porosities, macro porosities and micro porosities of subsoil are considerably larger.<BR>Relations between the structure type and moisture, and that between the structure type and permeability are described in reports No.3 and No.4.

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