Full-automatic static box system for CO2 flux measurement and flux measurement method

Abstract

The invention provides a CO2 flux measurement full-automatic static box system and a flux measurement method.The CO2 flux measurement full-automatic static box system comprises a static box, a CO2 sensor, a first humidity and temperature sensor, a second humidity and temperature sensor and a control terminal, and the gas inlet end and the gas outlet end of the CO2 sensor are both connected with the static box; the first humidity and temperature sensor is located in the static box and used for detecting the humidity in the static box, and the second humidity and temperature sensor is located outside the static box and used for detecting the humidity of the external environment; the static box is provided with a top cover for controlling opening and closing of the static box, and the motor can drive the electric telescopic rod to extend or contract so as to control opening or closing of the top cover; the control terminal can control starting and stopping of the fan, the CO2 sensor, the first humidity and temperature sensor, the second humidity and temperature sensor and the motor. Manual operation is not needed, the CO2 flux change can be continuously measured all day long, and all-weather, automatic and continuous monitoring of the CO2 flux of the farmland is achieved.

Description

Technical Field

[0001] The present invention relates to the field of gas measurement, and in particular to a fully automatic static box system for measuring CO2 flux and a flux measurement method. Background Art

[0002] The research on CO2 flux monitoring in farmland is gradually increasing, mainly focusing on various methods such as static box method, eddy covariance method and remote sensing technology. The static box method is currently the most commonly used and mature measurement method. The principle is to place a box of a specific size made of special materials above the crops in the farmland to measure the flux change of the target gas over time. However, the traditional static box method requires manual and uninterrupted data collection, which leads to problems such as slow data update and long collection cycle, limiting its application in long-term monitoring.

[0003] Based on the static box method, China has introduced high-precision NDIR sensors to achieve real-time monitoring and data collection of CO2 concentration. The research teams of the Chinese Academy of Agricultural Sciences and major agricultural universities have used a combination of static boxes and NDIR CO2 sensors to conduct long-term monitoring of farmland CO2 flux and study the impact of different farming methods and management measures on carbon emissions. Research teams from universities such as Beijing Agricultural University and Nanjing Agricultural University have conducted a large number of experiments on using NDIR sensors to measure farmland carbon flux, proving the feasibility and accuracy of this method. With the development of Internet of Things technology, some domestic research teams have begun to combine wireless sensor networks with static boxes to achieve automated monitoring of farmland carbon flux. Wang et al. studied the application of wireless sensor network systems in achieving synchronous measurement of regional soil carbon flux and explored new applications of wireless networks in farmland monitoring. There are many studies on high-precision sensors abroad, especially in the development and application of NDIR technology, and there are relatively mature solutions. Michael et al. used low-cost NDIR sensors and microcontrollers to measure CO2 flux, mainly improving the low-power design and data processing technology of the system; Bekin used static boxes and NDIR gas analyzers to measure CO2 flux for high-precision measurement. Helm used static chambers and NDIR sensors to conduct extensive CO2 flux measurements in a variety of ecosystems, including forests, grasslands, and farmlands, and verified that the combination of static chambers and NDIR is suitable for CO2 flux measurements in farmlands in different environments. After continuous improvement and refinement, the performance of static chambers has been greatly improved, but there are still shortcomings such as long-term coverage of static chambers has a significant impact on plant growth, continuous measurement cannot be achieved, data cannot be updated in real time, and the equipment cannot work fully automatically, which cannot meet the current measurement needs of CO2 flux changes in farmlands for a long time and all-weather. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a fully automatic static box system for CO2 flux measurement and a flux measurement method, which solves the problem in the prior art that the static box cannot achieve continuous measurement and the data cannot be updated in real time.

[0005] In a first aspect, the present application provides a fully automatic static box system for measuring CO2 flux, comprising a static box, a CO2 sensor, a first humidity and temperature sensor, a second humidity and temperature sensor, and a control terminal, wherein plants are placed in the static box, the air inlet and air outlet of the CO2 sensor are both connected to the static box, the first humidity and temperature sensor is located in the static box and is used to detect the humidity in the static box, and the second humidity and temperature sensor is located outside the static box and is used to detect the humidity of the external environment; the static box is provided with a top cover for controlling the opening and closing of the static box, the top cover is connected to an electric telescopic rod, the electric telescopic rod is connected to a motor, and the motor can drive the electric telescopic rod to extend or contract to control the opening or closing of the top cover; the static box is also provided with a fan for stirring the gas in the static box, the fan, the CO2 sensor, the first humidity and temperature sensor, the second humidity and temperature sensor, and the motor are all electrically connected to the control terminal, and the control terminal can control the start and stop of the fan, the CO2 sensor, the first humidity and temperature sensor, the second humidity and temperature sensor, and the motor.

[0006] In one embodiment, the static box includes a base and a box body, the plants are placed in the base, the top cover is located at an end of the box body away from the base, a sealed water tank is provided at an end of the base close to the box body, and the box body cover is closed on the sealed water tank.

[0007] In one embodiment, the CO2 sensor is further connected to an air pump, and the air pump is used to extract residual gas in the CO2 sensor.

[0008] In one embodiment, the control terminal includes a processor and a temperature sensor module, a carbon dioxide sensor module, a dual-way motor drive module, and an air pump module connected to the processor, the temperature sensor module is electrically connected to the first humidity temperature sensor and the second humidity temperature sensor, the carbon dioxide sensor module is electrically connected to the CO2 sensor, the dual-way motor drive module is electrically connected to the motor, and the air pump module is electrically connected to the air pump.

[0009] In one embodiment, the processor is further connected to a power module for providing electrical energy, the power module is electrically connected to a gel battery, and the gel battery is connected to a solar panel.

[0010] In one embodiment, the processor is further connected to a communication module, the communication module is communicatively connected to a cloud server, and the cloud server is communicatively connected to a PC for storing and displaying data.

[0011] In one embodiment, the processor is further connected to a heat dissipation module and a display screen, the display screen is used to display data collected by the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and the heat dissipation module is used to dissipate heat from the control terminal.

[0012] In one embodiment, the processor is provided with a 32-bit microcontroller chip with a chip model of STM32F103ZET6.

[0013] In a second aspect, the present application provides a CO2 flux measurement method, characterized in that it is performed by the CO2 flux measurement fully automatic static box system according to any one of claims 1 to 8, and the method comprises:

[0014] Step S1: Start the electric telescopic rod to drive the box body closer to the base until the box body completely covers the sealed water tank;

[0015] Step S2: Start the motor to drive the top cover to close and start the fan to rotate;

[0016] Step S3: preheating the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to an accurate measurement state;

[0017] Step S4: Start the air pump to remove the gas remaining in the CO2 sensor;

[0018] Step S5: Start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to collect and record data within a time period, and upload the collected data to the cloud database;

[0019] Step S6: After reaching the cycle time node, turn off the fan and the air pump, start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and start the motor to open the top cover;

[0020] Step S7: Repeat steps S1-6 at the beginning of the node of the next preset time period.

[0021] In the fully automatic static box system and flux measurement method for CO2 flux measurement of the present embodiment, when measuring the flux change of CO2, the CO2 sensor can monitor the change of carbon dioxide in the static box in real time, and correct the measurement result in combination with the temperature and humidity obtained by the first humidity temperature sensor and the second humidity temperature sensor. Since the air inlet and outlet of the CO2 sensor are connected to the static box, when collecting, it is circulated back to the static box through the CO2 sensor, thereby ensuring that the pressure and gas concentration in the static box are not disturbed by the measurement, and can also integrate the monitoring functions of other environmental parameters, such as soil moisture, light intensity and other environmental data, to further improve the comprehensive ability of environmental monitoring. The top cover is opened and closed periodically by the motor and the electric telescopic rod, without manual operation, and the flux change of CO2 can be measured uninterruptedly throughout the day, which solves the problems of cumbersome manual operation, intermittent data, and poor real-time performance in the process of measuring CO2 flux by the traditional static box method, and realizes all-weather, automatic and continuous monitoring of farmland CO2 flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Schematic diagram of the structure of the fully automatic static box for CO2 flux measurement and the CO2 sensor.

[0024] Figure 2 It is a structural diagram of the control terminal.

[0025] Figure 3 This is the system control circuit diagram of the control terminal.

[0026] Figure 4 This is the circuit diagram of the relay module.

[0027] Figure 5 This is the circuit diagram of the CO2 sensor module.

[0028] Figure 6 This is the circuit diagram of the dual-channel motor drive module.

[0029] Figure 7 This is the circuit diagram of the power module.

[0030] Figure 8 Schematic diagram of the CO2 flux measurement method.

[0031] Among them: 10. static box; 11. sealed water tank; 12. box body; 20. fan; 30. CO2 sensor. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0036] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0037] like Figure 1As shown, the present embodiment provides a fully automatic static box system for measuring CO2 flux, including a static box 10, a CO2 sensor 30, a first humidity and temperature sensor, a second humidity and temperature sensor and a control terminal, the plant is placed in the static box 10, the air inlet and air outlet of the CO2 sensor 30 are connected to the static box 10, the first humidity and temperature sensor is located in the static box 10 and is used to detect the humidity in the static box 10, the second humidity and temperature sensor is located outside the static box 10 and is used to detect the humidity of the external environment; the static box 10 is provided with a top cover for controlling the opening and closing of the static box 10, the top cover is connected to an electric telescopic rod, the electric telescopic rod is connected to a motor, the motor can drive the electric telescopic rod to extend or contract to control the opening or closing of the top cover; the static box 10 is also provided with a fan 20 for stirring the gas in the static box 10, the fan 20, the CO2 sensor 30, the first humidity and temperature sensor, the second humidity and temperature sensor and the motor are all electrically connected to the control terminal, and the control terminal can control the start and stop of the fan 20, the CO2 sensor 30, the first humidity and temperature sensor, the second humidity and temperature sensor and the motor.

[0038] In the fully automatic static box system for measuring CO2 flux of the present embodiment, when measuring the flux change of CO2, the CO2 sensor 30 can monitor the change of carbon dioxide in the static box 10 in real time, and correct the measurement result in combination with the temperature and humidity obtained by the first humidity temperature sensor and the second humidity temperature sensor. Since the air inlet and outlet of the CO2 sensor 30 are connected to the static box 10, when collecting, the air is circulated back to the static box 10 through the CO2 sensor 30, so as to ensure that the pressure and gas concentration in the static box 10 are not disturbed by the measurement, and can also integrate the monitoring functions of other environmental parameters, such as soil moisture, light intensity and other environmental data, to further improve the comprehensive ability of environmental monitoring. The top cover is opened and closed periodically by the motor and the electric telescopic rod, without manual operation, and the flux change of CO2 can be measured uninterruptedly throughout the day, which solves the problems of cumbersome manual operation, intermittent data, poor real-time performance, etc. in the process of measuring CO2 flux by the traditional static box 10 method, and realizes the all-weather, automatic and continuous monitoring of farmland CO2 flux.

[0039] In one embodiment, the static box 10 includes a base and a box body 12, the plant is accommodated in the base, the top cover is located at the end of the box body 12 away from the base, and the end of the base close to the box body 12 is provided with a sealed water tank 11, and the box body 12 covers the sealed water tank 11. In this embodiment, the base is frame-shaped and surrounds the plant, and a sealed water tank 11 is provided above the base. The box body 12 is embedded in the sealed water tank 11, and the static box 10 forms a relatively independent space through the water in the sealed water tank 11. The top cover is located at the top of the box body 12, and the top cover can be opened and closed by the extension and retraction of the electric telescopic rod, so as to periodically measure the CO2 flux.

[0040] In one embodiment, the CO2 sensor 30 is also connected to an air pump, which is used to extract the residual gas in the CO2 sensor 30. In this embodiment, the air inlet end of the CO2 sensor 30 is provided with an air inlet pipe, and the air outlet end of the CO2 sensor 30 is provided with an exhaust pipe. The air pump is connected to the exhaust pipe, so that the residual gas in the CO2 sensor 30 can be sucked clean and discharged into the static box 10 before the CO2 sensor 30 works.

[0041] like Figure 2-7 As shown, in one embodiment, the control terminal includes a processor and a temperature sensor module, a carbon dioxide sensor module, a dual-way motor drive module, and an air pump module connected to the processor. The temperature sensor module is electrically connected to the first wet temperature sensor and the second wet temperature sensor, the carbon dioxide sensor module is electrically connected to the CO2 sensor, the dual-way motor drive module is electrically connected to the motor, and the air pump module is electrically connected to the air pump.

[0042] In one embodiment, the processor is further connected to a power module for providing electrical energy, the power module is electrically connected to a gel battery, and the gel battery is connected to a solar panel.

[0043] In one embodiment, the processor is further connected to a communication module, the communication module is communicatively connected to a cloud server, and the cloud server is communicatively connected to a PC for storing and displaying data.

[0044] In one embodiment, the processor is further connected to a heat dissipation module and a display screen, the display screen is used to display data collected by the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and the heat dissipation module is used to control the heat dissipation of the terminal.

[0045] In one embodiment, the processor is provided with a 32-bit microcontroller chip with a chip model of STM32F103ZET6.

[0046] like Figure 3 As shown in the system control circuit diagram of the control terminal, the 32-bit microcontroller chip STM32F103ZET6 is used as the main control and data processing. The module has a maximum operating frequency of 72MHz and 64KB bytes of flash memory to meet large memory requirements and large data storage. It can reach 1.25DMIPS / MHz during periodic access and has a clock function. The microcontroller chip integrates sensor modules, relay modules, temperature and humidity modules, communication modules, microelectronic component power modules, and display modules.

[0047] Among them, pin 3 of the display module OLED is connected to pin PA5 of the microcontroller chip, pin 4 of the display module OLED is connected to pin PA7 of the microcontroller chip, pin 5 of the display module OLED is connected to pin PB0 of the microcontroller chip, and pin 6 of the display module OLED is connected to pin PA1 of the microcontroller chip.

[0048] Pins 2 of the two first humidity and temperature sensors DHT11 are connected to pins PA0 and PA1 of the microcontroller chip respectively, and pin 2 of the second humidity and temperature sensor DHT11 is connected to pin PA11 of the microcontroller chip.

[0049] like Figure 5 As shown in the figure, the pin 3 of the CO2 sensor is connected in parallel with the resistor R11 and then connected to the pins PA9 and PA10 of the microcontroller chip. Since the signal input and output ports of the CO2 sensor are the same COM port, a 680R resistor R11 needs to be short-circuited between the pins PA9 and PA10 of the microcontroller chip to achieve dual-channel communication between the sensor and the STM32.

[0050] Pin 3 of the communication module EC800N is connected to pin PA2 of the microcontroller chip, and pin 4 of the communication module EC800N is connected to pin PA3 of the microcontroller chip. The communication module communicates with the PC through the zigbee node. The zigbee protocol has the advantages of low power consumption and short latency, which can ensure long-term real-time CO2 flux measurement.

[0051] The cloud server of this embodiment adopts Alibaba Cloud platform. After the system is powered on, the main program first calls the hardware initialization function, including turning on the system clock and configuring the pin port of the microcontroller chip. The system will automatically connect to the Alibaba Cloud platform through EC800N to prepare for data transmission. After each module is successfully initialized, the system starts to work. Each module runs in an orderly manner under the control of the microcontroller chip. At the same time, sensor data and working status data of each module are collected and sent to the Alibaba Cloud Internet of Things platform, and saved to the local database through PyCharm, DataGrip, and MySQL.

[0052] like Figure 6 As shown in the figure, the motor that controls the opening and closing function of the top cover adopts a DC motor, which is controlled by the DC motor driver board L298N. The DC motor driver board L298N is a high-performance pulse width modulation power amplifier with the characteristics of small size and strong driving ability. When the enable terminal ENA is high level, the corresponding channel can control the motor, otherwise the motor is in a stopped state, and the rotation direction of the motor is determined by the level of the input of the IN1 and IN2 ports.

[0053] like Figure 4As shown, the microcontroller chip realizes the timed switch function of the fan, air pump, and sensor by controlling the optocoupler isolation switch (relay). The control function is completed by outputting high and low levels of the given I / O port through program control. Among them, pins 3 and 4 of the relay are connected to pins PB10 and PB11 of the microcontroller chip respectively.

[0054] like Figure 7 As shown, the power module provides two power supply voltages, 3.3V and 5V, which can meet the power supply requirements of all microelectronic components.

[0055] like Figure 8 As shown, this embodiment also provides a CO2 flux measurement method, which is performed by the above-mentioned CO2 flux measurement fully automatic static box system, and the method includes:

[0056] Step S1: Start the electric telescopic rod to drive the box body closer to the base until the box body completely covers the sealed water tank;

[0057] Step S2: Start the motor to drive the top cover to close and start the fan to rotate;

[0058] Step S3: preheating the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to an accurate measurement state;

[0059] Step S4: Start the air pump to remove the gas remaining in the CO2 sensor;

[0060] Step S5: Start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to collect and record data within a time period, and upload the collected data to the cloud database;

[0061] Step S6: After reaching the cycle time node, turn off the fan and the air pump, start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and start the motor to open the top cover;

[0062] Step S7: Repeat steps S1-6 at the beginning of the node of the next preset time period.

[0063] Specifically, in step S1, the electric telescopic rod can usually complete the top cover closing within 10 seconds, that is, after starting the electric telescopic rod, set the fan to start after 10 seconds; in step S2, the fan rotates for 10 seconds and enters step S3, the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor enter step S4 after preheating for 40 seconds, start the air pump, and after the air pump is turned on for 15 seconds, ensure that the air remaining in the CO2 sensor has been exhausted, and enter step S5, collect the carbon dioxide change data collected by the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor within 10 minutes, and the temperature and humidity data inside and outside the static box. After completing the 10-minute collection, turn off the fan, the air pump, start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, control the motor to open the top cover, so that the static box is connected to the outside world, complete the measurement of carbon dioxide flux in one cycle, and count 30 minutes after the top cover is opened for 10 seconds, and enter the measurement of carbon dioxide flux in the next cycle. It can be understood that the above time can be customized according to needs.

[0064] In system testing and field applications, the CO2 flux measurement fully automatic static box system of this embodiment showed good stability, real-time performance, accuracy and adaptability. Through 40 days of monitoring experiments, the system was able to accurately monitor the CO2 concentration for a long time, continuously and stably under different environmental conditions. The average relative error of the system was 3.37%. The experimental results show that the system has good measurement accuracy and long-term stability as well as strong environmental adaptability.

[0065] In summary, on the one hand, the fully automatic static box system for measuring CO2 flux in this embodiment solves the problems of cumbersome manual operation, intermittent data, poor real-time performance, etc. in the process of measuring CO2 flux by the traditional static box method, and realizes all-weather, automatic, and continuous monitoring of farmland CO2 flux; on the other hand, the modular design of the system provides convenience for future functional expansion, which can not only continue to optimize CO2 monitoring, but also integrate monitoring functions of other environmental parameters, such as soil moisture, light intensity and other environmental data, to further improve the comprehensive ability of environmental monitoring. On the other hand, by real-time monitoring of CO2 flux in farmland or greenhouse, the system can help agricultural managers optimize production and improve crop yield and quality. At the same time, the system can also be applied to ecosystem monitoring, evaluate the carbon sequestration capacity of different ecosystems, and provide reliable data support for global climate change research.

[0066] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A fully automatic static box system for measuring CO2 flux, characterized in that: The invention comprises a static box, a CO2 sensor, a first humidity and temperature sensor, a second humidity and temperature sensor and a control terminal, wherein plants are placed in the static box, an air inlet end and an air outlet end of the CO2 sensor are both connected to the static box, the first humidity and temperature sensor is located in the static box and is used to detect the humidity in the static box, and the second humidity and temperature sensor is located outside the static box and is used to detect the humidity of the external environment; the static box is provided with a top cover for controlling the opening and closing of the static box, the top cover is connected with an electric telescopic rod, the electric telescopic rod is connected with a motor, and the motor can drive the electric telescopic rod to extend or contract so as to control the opening or closing of the top cover; the static box is also provided with a fan for stirring the gas in the static box, the fan, the CO2 sensor, the first humidity and temperature sensor, the second humidity and temperature sensor and the motor are all electrically connected to the control terminal, and the control terminal can control the start and stop of the fan, the CO2 sensor, the first humidity and temperature sensor, the second humidity and temperature sensor and the motor.

2. The fully automatic static box system for measuring CO2 flux according to claim 1 is characterized in that: The static box includes a base and a box body, the plants are accommodated in the base, the top cover is located at one end of the box body away from the base, a sealed water tank is provided at one end of the base close to the box body, and the box body cover is closed on the sealed water tank.

3. The fully automatic static box system for measuring CO2 flux according to claim 1 is characterized in that: The CO2 sensor is also connected to an air pump, and the air pump is used to extract the residual gas in the CO2 sensor.

4. The fully automatic static box system for measuring CO2 flux according to claim 1 is characterized in that: The control terminal includes a processor and a temperature sensor module, a carbon dioxide sensor module, a dual-way motor drive module, and an air pump module connected to the processor. The temperature sensor module is electrically connected to the first humidity temperature sensor and the second humidity temperature sensor, the carbon dioxide sensor module is electrically connected to the CO2 sensor, the dual-way motor drive module is electrically connected to the motor, and the air pump module is electrically connected to the air pump.

5. The fully automatic static box system for measuring CO2 flux according to claim 4 is characterized in that: The processor is also connected to a power module for providing electric energy, the power module is electrically connected to a colloid battery, and the colloid battery is connected to a solar panel.

6. The fully automatic static box system for measuring CO2 flux according to claim 4 is characterized in that: The processor is also connected to a communication module, the communication module is communicatively connected to a cloud server, and the cloud server is communicatively connected to a PC for storing and displaying data.

7. The fully automatic static box system for measuring CO2 flux according to claim 4 is characterized in that: The processor is also connected to a heat dissipation module and a display screen, wherein the display screen is used to display data collected by the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and the heat dissipation module is used to dissipate heat from the control terminal.

8. The fully automatic static box system for measuring CO2 flux according to claim 4 is characterized in that: The processor is provided with a 32-bit microcontroller chip whose chip model is STM32F103ZET6.

9. A method for measuring CO2 flux, characterized in that: The method is performed by the fully automatic static box system for measuring CO2 flux according to any one of claims 1 to 8, and comprises: Step S1: Start the electric telescopic rod to drive the box body closer to the base until the box body completely covers the sealed water tank; Step S2: Start the motor to drive the top cover to close and start the fan to rotate; Step S3: preheating the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to an accurate measurement state; Step S4: Start the air pump to remove the gas remaining in the CO2 sensor; Step S5: Start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor to collect and record data within a time period, and upload the collected data to the cloud database; Step S6: After reaching the cycle time node, turn off the fan and the air pump, start the CO2 sensor, the first humidity and temperature sensor, and the second humidity and temperature sensor, and start the motor to open the top cover; Step S7: Repeat steps S1-6 at the beginning of the node of the next preset time period.

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