Carbon Dioxide Detector Regulation System Control and Measurement Principle

There have been many studies and descriptions of the effects of changes in CO2 concentration on plant growth and physiological processes, especially on the photosynthesis of plants. In the past, the above studies were conducted using artificial climate chambers, greenhouses, or semi-open, but due to various influences, such as temperature and humidity and light intensity, which affect growth, it cannot be judged only by changes in CO2 concentration. the result of. Therefore, the further analysis of the above problems through the CO2 detector is a better research method.

The internal design of the carbon dioxide detector is a relatively complex automatic system that controls the CO2 concentration of the air in the FACE enclosure by a complex automatic monitoring and regulation system. Place a circu- lation pipe parallel to the ground around the FACE ring to release the high-purity CO2 from a large gas tank into the ring. With the growth of wheat, the height of the deflation tube is gradually increased so that it is always 50 to 60 cm above the wheat canopy.

The circle contains not only wind direction and wind velocity measuring devices, but also CO2 concentration probes installed at several different positions. These probes are connected to the computer in the control room through the carbon dioxide detector. The machine changes the CO2 concentration in the circle and the wind direction and the wind speed. The flow direction and flow rate of the release pipe CO2 release are adjusted (1 minute adjustment) to ensure that the CO2 concentration in the circle is consistent with the target concentration. The CO2 concentration error within 85% of the year is within 10%.

The net photosynthetic rate (Pn) of wheat leaves within the FACE circle was significantly higher than that of the control at the respective CO2 concentrations measured in the CO2 concentration. The ratios of the two were 111%, 118%, and 115%, respectively, and FACE. The stomatal conductance (Gs) of wheat leaves in the circle was significantly lower than that of the control, with ratios of 63%, 75%, and 70%, respectively. The ratio of intercellular CO2 to air CO2 concentration (Ci/Ca) was not significantly different from the control. .

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