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Using the soil and temperature and humidity recorders as indicators of the early spring in the mountain of purple flowers and snow in the mountain, the response of temperature and photosynthetic rate and transpiration rate to the change of soil temperature under different soil temperatures were studied. . To reveal the suitable soil temperature and temperature range for photosynthetic growth of alpine plants, and to explore the synergy or stress between soil temperature and air temperature effects on photosynthesis and transpiration.
When the soil temperature and air temperature were 20°C and 25°C, respectively, the net photosynthetic rate of the leaves of the Primula amurensis was the highest at 14.67 μmol CO2·m-2·s-1. The optimum soil temperature range for leaf net photosynthetic rate is 15°C～20°C, and the optimum temperature range is 20°C～25°C. The soil temperature and humidity recorder found that the optimum soil temperature range was in line with the monthly mean temperature (15°C) at a depth of 5 cm deep in the in-growth soil, which was lower than that of tomato and amaranth. The temperature with the highest net photosynthetic rate is the same as the dwarf sedge grass that was born at 3200m above sea level.
In a certain range of soil temperature, when the soil temperature rises, it promotes the photosynthesis of the leaves; when it exceeds a certain point, the temperature rise will play an inhibitory role. Under different temperature conditions, the net photosynthetic rate of leaves in the same soil temperature range varies greatly with soil temperature, and even completely different trends appear.
The results of the soil temperature and humidity recorder showed that, when the soil temperature and humidity were controlled under certain conditions, different temperatures had great differences in the photosynthetic rate of the leaves, and the adaptation to the appropriate temperature was completely different. At 10°C~35°C and 15°C, under low temperature and high temperature conditions, the optimum soil temperature at the temperature of 20°C to 30°C in the net photosynthetic rate of Primula amurensis was relatively decreased. At different temperatures, the net photosynthetic rate was the lowest when the soil temperature was 25°C.
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Soil Temperature and Humidity Recorder to Explore Photosynthetic Rate Influence Factors
Environmental temperature plays an important role in the process of plant growth and survival. It is an important ecological factor that directly affects the photosynthesis and transpiration of plants. In addition, there is a sensitive response to changes in the temperature of the soil. Plants have very different growth conditions at both temperatures. There are many researches on the temperature and the growth of plants and leaves. However, there are few studies on the relationship between the temperature and humidity of the soil and the photosynthesis and respiration of the leaves of plants. At the same time, some related instruments such as the common soil temperature and humidity records The application of instrument in these studies also has a large space.