On the role of the bambooblades as a windbreak in farm field

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  • 冬季畑地における笹立ての役割について

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For protecting the crops from the wind damage the farmer often puts up bambooblades, some sort of leafy branches and straw fence in farm field. (So far as we know, the micro-climatic study for the role of the bambooblades has not been done much, so that it was decided to study this problem.)<br>The micro-climatic observations were made in the plots as shown in Table 1.<br>The observation were made for the minimum air temperature (at 2cm, 5cm and 10cm height), maximum air temperature (10cm height) and wind speed at each plot.<br>The most striking features of the result of this experiment are as follows:-<br>1. Effect to temperature. At night, the greater the number of stalkes put up on the ground, the higher is the air temperature with the bare ground. (See Table 2, Fig. 1.)<br>One reason for this is the retention of ground hert by protective bambooblade cover.<br>While, in case of 5cm height, the miximum air temperature in bambooblade plot becomes lower than bare ground.<br>This may be concidered that there is formation of inversion layer near the layer of 5cm height, and the intensity of inversion is more conspicuous in rough plot than in dense plot.<br>The maximum air temperature in the bambooblade plot is lower than that in the bare ground, because of bambooblade cover, the great portion of sun and sky radiation in caught by the branches or leaves.<br>2. Effect of protection against wind.<br>Next, we observed the wind speed at each plot by anemometeres set on the ground.<br>Fig. 2 shows the relation of the wind speed over bamboo plot with that over bare ground and gives the comparison of wind difference.<br>The remarkable distinction in the effect of protection against wind during night and day time was found, that is the effect in day time is much greater than in night. This fact may be explained as the air layer at night over the bare ground is in stable condition, while in day time unstable.

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