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THERMAL RADIATION LOAD ON TEMPERATURE REGIMES IN PLANT GROWTH CHAMBERS

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概要 In enclosed environments such as a plant growth chamber, thermal radiation plays an important role in determining heat balance and therefore the resultant temperature regimes. In artificially illumina...ted chambers, a significant level of thermal radiation is emitted from the lamps and/or the lamp house surface. Though there are both shortwave and longwave components in thermal radiation, our measurements in two different chamber designs, with and without thermal radiation filters, showed the longwave component being 2-3 times larger than the shortwave one. The increased thermal radiation, in particular the longwave component, caused differences in the temperatures of the plant and soil compared to that of the air. The differences were greater with increasing exposure to thermal radiation. Because of greater exposure to thermal radiation, both plant and soil temperatures were higher than the air temperature when plants were grown in isolated pots compared to plants in mutually shaded pots arranged in a block. In field-use chambers under natural light conditions, the longwave component of thermal radiation is modified to a large extent by the transmittance of the cover film. The temperature gradient chamber used in this study was covered with PVC film having low transmittance to longwave radiation and it showed a greater soil temperature relative to the air temperature when compared to a chamber covered with polyethylene film having high transmittance. As a result, across the two chambers and outdoors, the rice plant responses were correlated to the soil temperatures but not to the air temperatures.続きを見る

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登録日 2009.04.22
更新日 2020.02.10