Studies on Techniques for Measuring Photosynthesis and Transpiration of Plant Stand in the Closed Plant Experiment Facility in the CEEF (Closed Ecology Experiment Facilities)

概要

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Tests on performance and operation of the Closed Plant Experiment Facility (CPEF) of the Closed Ecology Experiment Facilities (CEEF) are currently under way. Tests on photosynthesis/transpiration measuring systems and procedures have been conducted since 1996. The CPEF has four independently controlled closed cultivation rooms, in which rates of photosynthesis and transpiration as the whole plant stand can be monitored simultaneously. Comparison of net photosynthetic (CO2 exchange) rate of a 30m2 rice stand calculated by multiplying the rate of CO2 draw-down by room air volume, with the rate calculated from the mass of supplied CO2 needed to hold steady state showed no difference exceeding 10% of each other between them. Changes in CO2 exchange rate of rice stand calculated using the former method with changes in PPFD, temperature and CO2 concentration were compared. Transpiration rate of rice stand with changes in PPFD, temperature and CO2 concentration were also monitored by tracking both difference in water vapor concentrations calculated from inlet and outlet dew points and air flow rates.
生態工学会の論文