Changes in the global climate are continuously aggravated by the increase in the concentration of carbon dioxide in the atmosphere. Therefore, the exploration of the issue of metabolism and balance of carbon content has always been concerned. Carbon dioxide is the main raw material for photosynthesis of plants in the environmental ecosystem, and it has a significant impact on crop yield and quality. However, in the natural environment, the research on crop adaptability and the efficiency of carbon dioxide space utilization is still in its infancy. Here we will introduce the results of the study on the distribution of carbon dioxide in the canopy of high-yield wheat fields and its effect on photosynthetic productivity; and analyze the problem of the decrease of carbon dioxide concentration in cropland due to the photosynthesis of crop populations. For carbon dioxide content determination and analysis can generally use carbon dioxide monitor for effective analysis.
The experimental wheat field has an area of ​​about 0.27hm2, surrounded by wheat fields and vegetable fields. The planting method is wide row seeding, row spacing 25cm, and the variety is Zhongmai No. 3. The high-yielding cultivation water and fertilizer management measures are adopted, and the estimated output is 350-400kg/666.7m2. The CO2 monitoring device is located in the center of the wheat field, more than 10m away from the boundary of the wheat field on each side, and uses two 2m-high aluminum rods to fix the carbon dioxide sampling tube and the temperature probe. According to the plant height at different growth stages, 6-9 heights are taken in the vertical direction. The automatic switching of the gas circuit is controlled by the solenoid valve to continuously sample alternately. The time interval is 30s. In order to minimize the measurement error, the pipeline is placed in a centralized manner. The concentration of carbon dioxide from a polyethylene tube with an internal diameter of 4 mm and a length of 20 m was taken at 1.5 l/min, and measured on a plant assimilation instrument. The accuracy of the instrument was ±1% FS (full scale). The temperature sensor is made of TL series glass thermistors with a total error of less than 0.2°C. The incidence of PAR flux on the horizontal surface of the wheat canopy was measured by a photosynthetic active radiometer.
According to the CO2 monitor, it is found that during the daytime crops act as sinks in the changes of farmland carbon dioxide, and they change with the conditions of ambient light and temperature. Although the wind has caused carbon dioxide to be transported and diffused to a certain extent and compensated for some of the internal canopy consumption, it is not sufficient to maintain the photosynthesis needs of the crop population and it has become a common reason for the reduction of carbon dioxide concentration in farmland, especially for dense planting crops. There is still a certain degree of difficulty in the distribution and distribution of CO2 concentration in farmland. Because, for vegetation, carbon dioxide is a material flow; for carbon dioxide, vegetation is a changing source or sink. This balance between crops, soil, and the atmosphere is subject to various environmental changes and has large simulation errors.
In high-yield wheat fields, the monitoring of CO2 content using a CO2 monitor shows that lower carbon dioxide concentrations in the canopy of the vegetation will inevitably affect the potential of the crop population for photosynthetic production, especially for dense crops. In the current open cultivation, many agricultural production increase measures have the effect of increasing the ventilation and carbon dioxide transport capacity within the crop groups, and reducing their concentration reduction effects, such as intercropping and multiple cropping. Straw mulching and rational application of organic fertilizer can increase the amount of carbon dioxide released from the soil and increase the concentration in the canopy.
The experimental wheat field has an area of ​​about 0.27hm2, surrounded by wheat fields and vegetable fields. The planting method is wide row seeding, row spacing 25cm, and the variety is Zhongmai No. 3. The high-yielding cultivation water and fertilizer management measures are adopted, and the estimated output is 350-400kg/666.7m2. The CO2 monitoring device is located in the center of the wheat field, more than 10m away from the boundary of the wheat field on each side, and uses two 2m-high aluminum rods to fix the carbon dioxide sampling tube and the temperature probe. According to the plant height at different growth stages, 6-9 heights are taken in the vertical direction. The automatic switching of the gas circuit is controlled by the solenoid valve to continuously sample alternately. The time interval is 30s. In order to minimize the measurement error, the pipeline is placed in a centralized manner. The concentration of carbon dioxide from a polyethylene tube with an internal diameter of 4 mm and a length of 20 m was taken at 1.5 l/min, and measured on a plant assimilation instrument. The accuracy of the instrument was ±1% FS (full scale). The temperature sensor is made of TL series glass thermistors with a total error of less than 0.2°C. The incidence of PAR flux on the horizontal surface of the wheat canopy was measured by a photosynthetic active radiometer.
According to the CO2 monitor, it is found that during the daytime crops act as sinks in the changes of farmland carbon dioxide, and they change with the conditions of ambient light and temperature. Although the wind has caused carbon dioxide to be transported and diffused to a certain extent and compensated for some of the internal canopy consumption, it is not sufficient to maintain the photosynthesis needs of the crop population and it has become a common reason for the reduction of carbon dioxide concentration in farmland, especially for dense planting crops. There is still a certain degree of difficulty in the distribution and distribution of CO2 concentration in farmland. Because, for vegetation, carbon dioxide is a material flow; for carbon dioxide, vegetation is a changing source or sink. This balance between crops, soil, and the atmosphere is subject to various environmental changes and has large simulation errors.
In high-yield wheat fields, the monitoring of CO2 content using a CO2 monitor shows that lower carbon dioxide concentrations in the canopy of the vegetation will inevitably affect the potential of the crop population for photosynthetic production, especially for dense crops. In the current open cultivation, many agricultural production increase measures have the effect of increasing the ventilation and carbon dioxide transport capacity within the crop groups, and reducing their concentration reduction effects, such as intercropping and multiple cropping. Straw mulching and rational application of organic fertilizer can increase the amount of carbon dioxide released from the soil and increase the concentration in the canopy.
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