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Changes in temperature or soil temperature did not have the same effect on the transpiration rate of Primula amurensis. Changes in temperature will affect the transpiration rate response to soil temperature and humidity recorders; soil temperature will also affect the transpiration rate response to temperature. At the appropriate photosynthesis temperature, there was a positive correlation between the net photosynthetic rate or transpiration rate and the stomatal conductance and intercellular CO2 concentration. Stoma closure is a major factor in the decrease of transpiration rate caused by low soil temperature or high soil temperature, and stomatal closure is also one of the factors that affect the decrease of net photosynthetic rate due to low soil temperature or high soil temperature.
The effect of soil temperature and humidity recorder on the photosynthetic activity and the effect of temperature on photosynthetic activity of P. alpura were reported. Leaf photosynthetic rate was highest when temperature and soil temperature were at optimal conditions. Any one of the soil temperature or air temperature deviates from the optimum range, and the net photosynthetic rate of the leaf will decrease significantly.
The changes of net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration showed that the temperature and temperature measured by the soil temperature and humidity recorder had different physiological mechanisms affecting photosynthesis and transpiration. Under different air temperatures, the physiological mechanisms of soil temperature affecting photosynthesis and transpiration are not completely the same; at different soil temperatures, the physiological mechanisms of temperature affecting photosynthesis and transpiration are also different.
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Effect of Soil Temperature and Humidity Recorder on Photosynthesis in Leaves
When the plants are at the same time unfavorable to soil temperature and temperature, the photosynthetic damage to the leaves is the greatest. Soil temperature and humidity recorders found that the soil temperature is higher than the temperature, which is unfavorable for photosynthesis. When the soil temperature is different, the optimum temperature will change. Different temperature conditions, the optimum soil temperature for photosynthesis will also be different. When the soil temperature changes, the relationship between net photosynthetic rate, transpiration rate, stomatal conductance, and intercellular CO2 concentration will vary greatly with the temperature conditions.