Changes in rainfall and temperature have a great influence on photosynthesis and related physiological parameters of plants. Photosynthesis of plants requires a lot of light and needs sufficient sunlight. Photosynthesis can only be carried out normally because light is the basis of photosynthesis, and temperature and rainfall also have a large influence on photosynthesis, such as temperature. Can affect the speed of physiological activities of plants, such as the reaction of some enzymes in the process of photosynthesis, need the right temperature. Temperature and rainfall, we can use the temperature and humidity recorder for measurement.
Here we use Salix seedlings as a research object: We have concluded that different watering rates significantly affect the net photosynthetic rate, transpiration rate, and stomatal conductance of Salix psammophila seedlings through different water supply and different environmental temperatures. The intercellular CO2 concentration, except for the temperature of the seedling leaves, decreased with the increase of watering, other factors increased with the increase of the amount of watering, when the amount of watering was small, the net photosynthetic rate of the seedlings obviously had a "nap" phenomenon, sufficient watering Water effectively eliminates the “nap†phenomenon of net photosynthetic rate of seedlings; the increase of watering reduces the light compensation point of Salix psammophila seedlings, increases the saturated light intensity and the apparent quantum efficiency, and under the treatment of different amounts of water applied, the photosynthetically active radiation of environmental factors , Atmospheric temperature, atmospheric saturation vapor pressure difference and physiological variables stomatal conductance, leaf temperature, intercellular CO2 concentration all significantly affect the net photosynthetic rate of seedlings. The carbon dioxide content can be controlled by a carbon dioxide detector, and the temperature can be controlled appropriately. Under controlled soil moisture treatment, the effect of simulated atmospheric CO2 concentration and enhanced radiation on photosynthetic characteristics of Caragana korshinskii was demonstrated. The results showed that below the saturation point of CO2 concentration, the response rate of CO2 concentration in Caragana korshinskii was linear in response to the response of CO2 to the radiation response. Logarithmic function relationship. The photosynthetic rate of Caragana korshinskii increased with the increase of radiation intensity and CO2 concentration. When the soil moisture was high, the change rate of photosynthetic rate of Caragana korshinskii increased with the radiation intensity. When the soil moisture was low, the photosynthetic rate was 500 μmol. • When m-2•s-1 was the most sensitive to CO2 concentration, the dark breath of Caragana korshinskii increased with the increase of CO2 concentration. The lower the soil moisture was, the more sensitive the response to CO2 concentration was. This study showed that the net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, and transpiration rate of T.gonis were higher at higher rainfall, lower at natural rainfall, lower at lower rainfall, and at 25°C. There is no significant difference at 15°C. In fact, with so many influence parameters of photosynthesis, we can use a comprehensive instrument called a hand-held meteorological instrument to measure the temperature, humidity, light intensity, photosynthetically active radiation, wind speed, rainfall, CO2 concentration, Soil temperature, soil moisture, soil pH, soil EC conductance 11 parameters, called full-function instrument. The results showed that photosynthetic radiation response of alpine meadow plants to photosynthetic radiation was affected by the change of rainfall. If the future rainfall decreased, photosynthesis of alpine meadow plants would be limited and productivity would be reduced. The effect of temperature change was not significant, perhaps because the temperature set in this study was within the normal temperature range of the alpine meadow.
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