火山灰下層土における粗孔隙の根成的特徴について

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タイトル別名
  • On the Root-forming Characteristics of Coarse Pores found in Volcanic Ash Sub-soil
  • カザンバイ カソウド ニ オケル ソコウゲキ ノ コンセイテキ トクチョウ ニ
  • A stereoscopic study of soil pores imaged using soft X-ray radiography
  • 立体視による孔隙の軟X線透写像の観察

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The authors introduced a simple method of stereo-radiography which made it possible to perform the stereoscopic observations of pores using soft X-ray radiography.<BR>As a result, the availability and effect of the Heavy Liquid Infiltration Method was considerably increased.<BR>The shapes of coarse pore images in volcanic ash sub-soil were similar to those of the roots of grasses, especially Graminaceous types. In Japan, Graminaceous grasses are recognized as grass land plants that form the humic horizen of present and buried volcanic ash soils. This has been proved by the presence of plant opals found in the humic horizon of volcanic ash soils, where the volcanic ash soil region has been covered by Graminaceous grasses for a long time. Therefore, there is a good possibility that the coarse pores found in sub-soils have been formed by Graminaceous grass roots.<BR>The observed coarse pores in volcanic ash sub-soils seemed to have shapes that were independent of the inter-particle spaces of solid grains or of soil structural units. The majority of coarse pores had a tubular shape. The non-capillary pores had many branches and these branch pores had a smaller diameter. The non-capillary and capillary pores had ranifying connectivity and existed as a capillary net. Fine pores with diameters up to 25μm in size could be observed, but the authors presumed that most fine pores had been formed by root hairs about 10μm in diameter. It was therefore considered that the capillary pore net had a function of percolation and moisture retention as in an aggregate structure.

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