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KMID : 0903619980390050605
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 5 p.605 ~ p.609
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Influences of Indoor Light , Temperature , Absolute Humidity , and CO2 Concentration on the Changes of Transpiration and Photosynthesis Rate of Pachira aquatica and Their Statistical Modeling
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Abstract
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In addition to its visual attraction, indoor plant generally has influence on physical environments of indoor space by its photosynthesis and transpiration. Therefore, studies to investigate the influences of environmental factors on the changes in transpiration and photosynthesis rate of Pachira aquatica and to obtain statistical models which estimate their changes were performed. Transpiration and photosynthesis rate of Pachira aquatica defined as functions of variable environmental factors; temperature (18, 23, and 28℃), CO₂ concentrations (500, 1000, and 1500 ppm), light intensity (0, 800, and 1600 lux), and absolute humidity (6.5, 10, and 13.5 g·㎝^(-3)) were measured and their estimation equations were formulated by using multiple regression analysis. Transpiration rate increased as temperature and light intensity increased while decreased as CO₂ concentration increased. However, transpiration rate increased with increasing humidity up to 10 g·㎝^(-3), but decreased under high humidity. Photosynthesis rate increased as temperature, CO₂ concentration, and light intensity increased. It was found that the equations for modeling that could estimate the changes of transpiration and photosynthesis according to the environment changes fitted into photosynthetic status fairly well (r²=0.84), but not into transpirational status (r²=0.24).
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