筑波実験植物園の土壌の物理的性質 : 植栽基盤の水分環境とその改良法に関する研究(その1)

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The authors researched both the physical properties of soil and the soil profiles for edaphological soil management at the north-east slope of the Tsukuba Botanical Garden. The slope was covered with the Kanto loam……a volcanic ash soil distributed in the Kanto District, Japan. The results of this research were summarized as follows; 1. Morophological chracteristics common to the Kanto loam were found in three soil profiles at research sites. 2. Solid phase of the Kanto loam in the garden were small, about 18-34%. Porosity were about 66-75% in the surface soil and 66-82% in the subsoil (B-C horizon). It was to be noted that the subsoil of the Kanto loam had such a high porosity in spite of its low humus (light color) (Table 1, Figs. 2, 3). 3. Apparent specific gravity were about 0.5-0.9g/cm^3 (Table 1, Figs. 2, 3). Those values were chracteristic. Apparent specific gravity of the top soils were upper limit of those of volcanic ash soils in the world, but the subsoil had the standard values of volcanic ash soils. 4. Soil moisture contents were high, especially the soil had a large quantity of non-free water (connected to soil particles by a force greater than pF 4.2) (Table 1, Fig. 2). 5. The deeper layer of the slope was clay layer. They had larger solid phase, lower porosity, larger apparent specific gravity and lower coefficient of water conductivity than those of the Kanto loam, or the upper layers (Table 1, Fig. 3).
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筑波実験植物園の土壌の物理的性質 : 植栽基盤の水分環境とその改良法に関する研究(その1)

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