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1.スギ模型林分内の光の減衰状態は,直射光の有無によって大きく影響される.2,植栽密度のちがい,あるいは植被層の発達の程度によって光の減衰の程度はことなる.3.密度がことなれば照度-葉重量関係にちがいが現われてくる.4.林分内の温度分布は,植栽密度,植被層の発達程度によって影響され,能動面の移行は特にこれらの因子と関係が深い.5.植被層が充分に発達している場合は,地表面温度の日変化振幅は最大振幅の...1/3程度にまで縮少される.6.日変化振幅は能動面が最も安定しているようである.7.林内の蒸発量は被陰度によってかなり影響される.8.蒸発散能と飽差との間には直線的な関係が見られた.9.蒸発散能は蒸発能よりも常に大であり,植栽密度や気象条件によってその値はことなっている.
This paper deals with the study of the influence of planting densities on the micro -climate of model stands of Sugi (Cryptomeria japonica D. Don). In the model stands, several climatic factors (intensity of illumination, temperature, evaporation, and potential evapotranspiration) were measured. The model stand of Sugi plantlets was established in March 1959, and intensity of illumination, temperature and evaporation were measured in this stand. The relationship between the intensity of illumination and the weight of leaves was measured in a model stand of Sugi seedlings. The Wagner pots planted with Sugi seedlings were used as evapotranspirometers and these were arranged as shown in Fig. 1. The results obtained are summarized as follows. 1. The reduction of light in the model stand of Sugi was influenced largely by the presence of direct light. 2. The reduction in intensity of illumination varied with differences in the planting density and the degree of plant cover. 3. The difference of density showed its effect in the relationship between the relative intensity of illumination and the weight of leaves. 4. The distribution of temperature in the model stand was affected by the planting density and the degree of plant cover. And especially, the transposition, of active surface was closely connected with these factors. 5. Under the dense plant cover, the daily range of temperature at the ground level was reduced to 1/3 of the maximum range. 6. The daily range of temperature on an active surface was stabler than at the other levels. 7. The evaporation in the model stand was distinctly affected by the degree of shade. 8. A linear logarithmic relationship existed between the potential evapotranspiration and the water deficit. 9.The potential evapotranspiration was always larger than the potential evaporation, and was modified by the planting density and climatic conditions.show more
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I はじめに II 試験の方法 III 結果および考察 IV 摘要 参考文献 Resume
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