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The CO2 flux of the CO2 detector was used to calculate the total net photosynthetic population of the population for 12 hours during the day. However, the attention paid to the inhomogeneous phenomenon of CO2 concentration field in the above-mentioned farmland has not been sufficient. This is a noteworthy issue in current research. It is still difficult to study the carbon dioxide concentration distribution and transportation problems in farmland. Because, for vegetation, carbon dioxide is a material flow; for carbon dioxide, vegetation is a changing source or sink.
In order to prove that the background of carbon dioxide is relatively high, a comparative test was conducted on a 5hm2 wheat field at the Changping Crop Breeding Base, about 50km away from the test point of the CO2 detector. The results showed that the carbon dioxide concentration at 1m above the crown of wheat was higher than that of Changping. About 20μL/L. In addition, due to the small area of ​​the test site, the boundary effect may cause the gas turbulent exchange to increase, resulting in a small gradient of carbon dioxide concentration in the crop population.
The factors affecting the CO2 detector in the vegetation canopy show the changes in the low concentration region: weather conditions related to crop photosynthetic and carbon dioxide transport dynamics, including daily radiation intensity, atmospheric wind speed and inversion temperature, etc.; related to crop photosynthesis Population conditions, including crop growth period, plant height, leaf area coefficient, and morphological structure; soil temperature, humidity, and organic matter content related to soil carbon dioxide emissions.
Carbon Dioxide Detector Display with Vegetation Canopy Factors
This balance between crops, soils, and the atmosphere is subject to various environmental changes and has large simulation errors. Many foreign scholars have studied the distribution of CO2 concentration in forest vegetation using a CO2 detector. Calculations show that near-surface and vegetation canopies have a much larger spatial scale than turbulent eddies and canopy gradients. The conditions for the establishment of the gradient diffusion theory cannot be satisfied and the application of the aerodynamic method is limited. Therefore, the research on the carbon dioxide transportation method in the farm canopy needs further study.