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The increase of the light intensity makes the temperature increase effectively. When the temperature increases to a certain degree, the photosynthetic rate does not increase but it decreases, indicating that Sudan grass is entering the photosynthesis/midday break 0, which also indicates that the photosynthetic rate is not synchronized with the light intensity and temperature.
The photosynthesis/midday break 0 phenomenon of Sudangrass occurs from 13:00 to 16:00, and the photosynthetic rate and photosynthetically active radiation are not synchronized. Photosynthesis is a very complex physiological process in plants. Net photosynthetic rate and self factors such as chlorophyll content and leaf thickness Leaf maturity, etc. are closely related, but also by the temperature, light intensity, stomatal conductance, transpiration rate, air relative humidity and other effects. By studying the main environmental factors affecting the photosynthetic rate of Sudan grass, it was found that the temperature was significantly positively correlated with transpiration rate and stomatal conductance, and negatively correlated with relative humidity. This was consistent with the conclusions of studies on other plants, and the light The intensity directly affects the temperature. Therefore, the most important environmental factors affecting the photosynthetic rate of Sudan grass are temperature and light.
The determination of photosynthetic apparatus found that, in addition to its excellent quality as a forage grass, existing studies have shown that Sudan grass has a certain ability to resist salt and drought, and can grow well in salinized soil in arid areas, so it is in Xinjiang. It may become a pioneer plant in ecological restoration. At present, preliminary results have been obtained in the study of fragile ecosystem restoration in the Tarim River Basin. Due to the rapid growth characteristics of Sudan grass, it also has a good application prospect in remediation of heavy metals in soil. In addition to the needs of CO2 reduction and source increase response measures due to climate warming, the high carbon-fixing efficiency of plant sudan grass will inevitably become a research. Hot spots.
With regard to the daily variation of photosynthetic rate, scholars at home and abroad have conducted extensive research on various plants. It is generally believed that the diurnal variation of photosynthetic rate is a single-peak curve or a double-peak curve. Plants absorb CO2 through photosynthesis and plants act as carbon sinks. The strength of carbon sequestration plays an important role in reducing atmospheric CO2 concentration. Sudan grass is also known as wild sorghum, which is a 1-year-old herbaceous plant of the genus Gramineae. It can adapt to the same environment as sorghum and only matures earlier. Sudan is warm and cold, but it is not tolerant to cold, but has strong drought resistance, rapid growth, strong ability to produce tillers and regeneration, and it can grow 5 to 10cm during the day and night of jointing. It has high carbon fixation efficiency and is one of the grass species preferred for climate change mitigation. The photosynthesis instrument can effectively measure photosynthesis and provide support for the growth and development of crops.