Study on Changes and Growth of Plant Carbon Dioxide with Crop Canopy Analyzer
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Crop canopy analyzers use the crop canopy scale to study the relationship between carbon dioxide concentration in the soil-crop-atmosphere continuous system (SPAC), where crops are the mainstay. Some sources pointed out that when the photosynthetic population is flourishing, densely growing wheat groups can achieve a net assimilation of up to 90 g of carbon dioxide per square meter of land on a sunny day, 11 g of assimilation of carbon dioxide during a grain filling period of 1 h, and a dark breathing of about 5 g overnight. Under the sunny conditions, the crop canopy analyzer has a large gradient of carbon dioxide concentration inside and outside the crop canopy in the vertical direction during the day. At the filling stage of wheat about 90cm in height, the gradient of carbon dioxide above canopy was less than 0.4μL/L/cm; the inside of canopy was about 1μL/L/cm. It can be seen that the photosynthetic and respiration of crops are the main reasons for the diurnal variation of carbon dioxide concentration in the canopy of crops. In the SPAC system, crops and the atmosphere play the role of alternating source and sink in one day.
The soil is a permanent source of carbon dioxide, releasing approximately 2 to 10 g of carbon dioxide per day on approximately every m2 of land. Crop canopy analyzers found that due to the respiration of the plant population and the presence of the atmospheric inversion layer near the ground at night, the concentration of carbon dioxide near the surface is not conducive to upward diffusion and the concentration is increased, and the vertical gradient is greater. The height of the lowest CO2 concentration in the canopy of the crop during the daytime is close to the location of the largest area density of the farmland leaf.