Populus euphratica is a major species of desert riparian forest in extreme arid regions of China. It is resistant to salt and alkali, moisture, drought, and sand, and it is a dream for maintaining arid and semi-arid areas to breed his system, safeguarding the production of oasis for agriculture and animal husbandry and for residents. Living materials, etc. play an important role, with high ecological, economic and social benefits. In recent years, with the deterioration of the ecological environment, desert riparian forests represented by Populus euphratica have suffered severe drought stress. Therefore, in view of this situation, it is necessary to use plant photosynthesis analyzer to study the effects of drought and high temperature stress on the growth of Populus euphratica. The impact, especially on its photosynthesis.
The photosynthetic rate, stomatal conductance, transpiration rate, and intercellular carbon dioxide concentration of Populus euphratica leaves at 27°C and 39°C were measured using a plant photosynthesis tester. The photosynthesis of Populus euphratica and Populus euphratica under different groundwater depths was compared. Correspondingly, it was found that the photosynthetic rate and stomatal conductance were significantly reduced at the high temperatures of the three groundwater depths, and the depth of the photosynthetic rate and stomatal conductance were also decreased at high depths (7.02m) of groundwater depth. The largest, which all shows that drought stress has strengthened the negative effect of high temperature on the photosynthesis of Populus euphratica. However, under the same depth of groundwater, the intercellular CO2 concentration in leaves of Populus euphratica leaves did not decrease with the decrease of net photosynthetic rate and stomatal conductance due to the influence of high temperature. This may be due to the fact that the stomatal closure was uneven. The transpiration rate and the saturation vapor pressure of the leaves increased significantly due to the effect of high temperature, and the increase in transpiration rate caused by the high temperature at the depth of 7.02m was the smallest, indicating that the stomata affected the photosynthesis of Populus euphratica under high temperature stress. The role of a certain degree of regulation.
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