Studies on the Assimilation of Carbon in Tea Plant (Part 6):On the Apparatus for Measuring Gas-Exchange by Infrared Gas Analyser, and the Examination of Some Problems on Measurement of Gas-Exchange with the Apparatus
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The authors constructed an apparatus for measuring the rate of gas-exchange in tea plant with an infrared gas analyser.<BR>The examination of some fundamental problems on measurement of gas-exchange in tea plant was carried out with the apparatus.<BR>The results are obtained as follows.<BR>1) At different seasons, the diurnal changes in the CO2 concentration of air in outdoor and in a greenhouse were measured, and it recognized that the fluctuation of the CO<SUB>2</SUB> concentration in outdoor was smaller than that observed by other researchers. In winter daytime, it was observed that the CO<SUB>2</SUB> concentration in a closed greenhouse decreased remarkably.<BR>2) The keeping ability of the sample air in a vinyl bag was examined. It was observed that the variation of the CO<SUB>2</SUB> concentration of sample air in the bag was so small that it hardly disturbed the measurement of gas-exchange.<BR>3) At the measurement of assimilation rate in tea shoots, it required more or less time until the assimilation rate reached a constant value after insertion in chamber in accordance with the character of sample leaves.<BR>4) Studying the relationship between the rate of air supply and the assimilation rate, a linear regression was found between the mean CO<SUB>2</SUB> concentration in the assimilation chamber and the relative assimilation rate.<BR>5) It was observed that the assimilation rate in the leaves which was measured soon after plucking was high in the morning, and decreased at midday and continued a low level throughout the afternoon. But there was no diurnal fluctuation of the assimilation rate in the leaves which were stored in a darkroom before measuring<BR>6) At a high light intensity, it was observed that the assimilation rate in the leaves illuminated on the reverse side was lower than that illuminated on the obverse side, and the light saturation point was seemed to be about 30 klux in both illuminating directions.<BR>7) The rate of gas-exchange in dirty leaves with soil dust decreased remarkably, and the assimilaton rate varied according to the amount of adhered soil dust.<BR>8) Measuring the rate of respiration in non-assimilative organs, it was recognized that the amount of respiration in rootlet took a considerable part of that in young tea plant. And it was observed that the green part of stem had assimilating capacity, but it was less feeble than that of leaves.
- 日本茶業技術協会の論文
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