CO2 Detector Analysis of Various Stages of Wheat Field
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The highest values ​​of CO2 concentration at all levels of the sunny days appeared at 0-5 at night, and the lowest values ​​appeared at about 14-15 at noon during the day with strong radiation and high temperatures. The size of the poor day's concentration depends on the size of the crop's population and wind speed, and decreases with height. Calculated with the average carbon dioxide concentration measured by the CO2 detector per hour, the daily carbon dioxide concentration in the canopy from booting to filling stage was approximately 50-100 μL/L, and 1 m above the crown was 20-50 μL/L.
The stratified leaf area index at each growth stage of wheat and the vertical profile of CO2 concentration in the canopy around 11 noon, the CO2 detector can be used to see that the height of the lowest value of CO2 concentration in the canopy of daytime crops and the maximum area density of farmland leaf area. The position is nearly uniform, about 1/2 crop natural plant height. The maximum daily difference generally occurs within 40 cm of the ground in the wheat canopy. During the daytime from 08 to 18 hours, the curve of carbon dioxide concentration changes more smoothly.
By CO2 detector analysis Under relatively stable atmospheric conditions, the CO2 concentration in farmland mainly varies with the assimilation amount and solar radiation status of crops at different growth stages. In addition, within the canopy of wheat, due to the change of the source and sink of carbon dioxide between the soil and the crop, and the aerodynamic and thermal effects, the small-scale fluctuations of carbon dioxide concentration between plants are caused for a short time.