Device for monitoring CO2 in deep soil in real time and operation method thereof

Abstract

The invention discloses a deep soil CO2 real-time monitoring device and an operation method thereof, and belongs to the technical field of soil gas test devices, the device comprises a CO2 sensor, a sensor shell, a peristaltic pump, a gas transmission pipe, a gas cylinder filter screen, a gas collection cylinder, a power supply, a power line, a data transmission line and an LED display screen. Meanwhile, the invention further discloses an operation method of the device for monitoring the CO2 in the deep soil in real time. The device for real-time monitoring of CO2 in deep soil provided by the invention can collect CO2 in soil at different depths and monitor data in real time through the CO2 sensor, so that the quantity of CO2 gas discharged from the soil at different depths can be accurately obtained, the difficulty and defects of traditional deep soil CO2 measurement are overcome, and the real-time monitoring of CO2 in deep soil is realized. And compared with the existing device, the device has the characteristics of high data acquisition frequency, high measurement precision, convenience in installation and the like, and is suitable for popularization and application.

Description

Technical Field

[0001] This invention belongs to the technical field of soil gas testing devices, and relates to a device for real-time monitoring of CO2 in deep soil and its operation method. Background Technology

[0002] Soil organic carbon pool is the largest carbon pool in the terrestrial system, with a carbon content more than three times that of the atmosphere and terrestrial vegetation. However, more than 70% of the carbon in the soil carbon pool is stored below 20 cm of soil, meaning that the soil below 20 cm is the key area for carbon sequestration. Therefore, it is extremely important to study the CO2 concentration in deep soil under different ecosystem conditions and the CO2 emission patterns in deep soil under different emission reduction measures.

[0003] Chinese invention patent publication number CN222506073U discloses a soil carbon dioxide measurement experimental device. The device includes a sample chamber containing multiple evenly distributed receiving cavities. Sample bottles are placed inside each receiving cavity. A bottom cap is connected to the bottom of each sample bottle, and a sealing plug is provided at the bottle opening. A connecting tube is threaded through the center of the sealing plug. One end of the connecting tube is connected to a collection hood, and the other end is connected to…

[0004] The device is equipped with a U-shaped tube, which is connected to the inner top surface of a top cover via a clamping mechanism. During testing, simply replacing the sample inside the sample chamber at the bottom of each sample bottle allows the U-shaped tube, connected by a connecting tube and containing liquid, to collect carbon dioxide generated by the sample inside the bottle into the U-shaped tube. Under pressure, the liquid level inside the U-shaped tube changes, thus revealing the carbon dioxide content in the sample. While this invention features a sample chamber design with multiple independent cavities (capable of holding multiple sample bottles simultaneously), supporting batch soil sample testing and significantly improving experimental efficiency, it is suitable for large-scale research. The U-shaped tube can be paired with a ruler (manual reading) or a liquid level sensor (automatic monitoring) to adapt to different accuracy requirements and experimental conditions. However, it also has some limitations. It is limited to static cumulative measurement and cannot monitor the dynamic process of CO2 release in real time, only reflecting the cumulative amount over a certain period, making it difficult to capture instantaneous changes in respiration rate. It is highly dependent on manual operation, requiring manual sample replacement, scale reading, or liquid level sensor calibration, which may introduce human error (such as reading deviation).

[0005] Chinese Invention Patent Publication No. CN220040370U discloses a gas diffusion monitoring device, relating to the field of soil carbon dioxide emission monitoring technology. This invention includes an upper gas chamber mechanism, with an end cap mechanism fixedly installed at its top. The upper gas chamber mechanism and the end cap mechanism are airtightly connected. A soil column chamber mechanism is fixedly installed at the bottom of the upper gas chamber mechanism. A sealing mechanism for clamping and ensuring a seal is fixedly installed at the connection between the upper gas chamber mechanism and the soil column chamber mechanism. By setting up the sealing mechanism, this invention allows the upper gas chamber mechanism, soil column chamber mechanism, and lower gas chamber mechanism to be separated. During use, different soil column chamber mechanisms can be used to change the soil sample being measured. The simple structure makes the device small in size, inexpensive, and highly stable. Multiple devices can be installed simultaneously for measurement, thus achieving multi-channel continuous positioning monitoring. This invention's device has a simple structure and small size, allowing for the simultaneous installation of multiple devices for multi-channel continuous monitoring, suitable for large-scale experimental needs. Multiple built-in temperature and humidity sensors (first, second, and third temperature and humidity sensors) can monitor the internal temperature and humidity changes of the device in real time, providing more dimensions for data analysis. However, some limitations exist. Although the structure is simple, proper installation of the sealing mechanism and sensors is required; improper operation may lead to insufficient airtightness or data errors. The stability of the device under extreme temperature, humidity, or harsh environments is not clearly stated, which may affect the reliability of long-term monitoring.

[0006] Chinese invention patent publication number CN221883648U discloses a device for measuring the soil respiration rate in tropical forests, comprising an inner soil tube, an outer soil ring, an inner gas chamber, an outer gas chamber, and a carbon dioxide measuring device. This invention, through the combined structure of the inner soil tube and outer soil ring, along with the inner and outer gas chambers, enables the simultaneous measurement of heterotrophic respiration and total respiration rates. Because the inner soil tube is buried relatively deep, and the inner soil tube and outer soil ring are connected together, the stability of the outer soil ring is greatly enhanced, effectively preventing loosening and displacement, making it particularly suitable for use in sloping tropical forest plots. The inner soil tube and outer soil ring employ a detachable connection structure, facilitating the replacement and combination of soil tubes and rings of different specifications. While this device overcomes the shortcomings of traditional equipment in terms of stability, terrain adaptability, and multi-parameter measurement through structural innovation, and is particularly suitable for long-term soil respiration monitoring in complex environments such as tropical forests, it also has certain limitations in soil gas measurement. The complex structure and cumbersome installation require assembling multiple components such as the inner soil tube, outer soil ring, and gas chamber, making the burial and disassembly process relatively troublesome and potentially increasing the difficulty of field operations. Relying on an electric fan results in high energy consumption, requiring continuous power to drive the fan for gas mixing. In field environments without a stable power source, it may rely on batteries, increasing maintenance costs. There is also a potential risk of gas leakage. Although sealing gaskets and threaded connections are used, the sealing performance may deteriorate after prolonged use or frequent disassembly, leading to gas leakage and affecting measurement accuracy.

[0007] Chinese Invention Patent Publication No. CN118896818A discloses a device for cultivating, collecting, and measuring carbon dioxide in soil, relating to the field of soil carbon dioxide collection. This device includes a cultivation component comprising a cultivation tank with an internal placement groove. A collection component, comprising a gas collecting bottle with two through slots on its upper surface, is located at the rear end of the cultivation component. In this invention, soil is placed inside the cultivation tank, and the cultivation component, piping component, collection component, and aeration component are connected. The end of the aeration component furthest from the collection component is then connected to a vacuum pump. The vacuum pump evacuates the entire device to a vacuum, separating the cultivation component from the collection component. The cultivation component is then placed under pre-set conditions for further cultivation. The carbon emissions of the experimental soil are calculated by titrating the solution in the gas collecting bottle with a dilute hydrochloric acid solution of known concentration. This invention uses a chemical titration method (NaOH absorption of CO2 + hydrochloric acid titration) instead of an expensive gas chromatograph, significantly reducing equipment costs and making it suitable for laboratories or field research with limited budgets. Rubber sleeves, threaded connections, and glass materials (such as gas collecting bottles and pipes) ensure the device's airtightness, reducing external gas interference and improving measurement accuracy. However, it also has certain limitations. It is highly dependent on manual operation, requiring manual vacuuming, valve switching, titration, and other steps, which are cumbersome and prone to human error (such as deviations in titration endpoint judgment). The cultivation, vacuuming, and titration processes are time-consuming, making real-time or high-frequency monitoring impossible and failing to capture instantaneous changes in soil respiration. An external vacuum pump is required for vacuuming, limiting its use in field environments without power, and its portability is poor.

[0008] Current methods for measuring CO2 in deep soil are complex and time-consuming, from sample collection to instrument analysis. They cannot achieve rapid measurement or meet the need for timely results. Therefore, there is an urgent need for a device and method that can collect CO2 data in deep soil in real time. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a device and its operation method for real-time monitoring of CO2 in deep soil. This device can collect soil gas from different depths and has good sealing properties.

[0010] The embodiments of the present invention are implemented as follows:

[0011] On one hand, embodiments of the present invention provide a device for real-time monitoring of CO2 in deep soil, including a CO2 sensor, a sensor housing, a peristaltic pump, a gas transmission pipe, a gas cylinder filter, a gas collection bottle, a power supply, a power cord, a data transmission line, and an LED display screen. The CO2 sensor is connected to the peristaltic pump through the gas transmission pipe, and the peristaltic pump is connected to the gas collection bottle through the gas transmission pipe. A gas cylinder filter is installed on the outside of the gas collection bottle to prevent solid impurities from clogging the air inlet. The peristaltic pump is connected to the power supply through a first power cord, the CO2 sensor is connected to the power supply through a second power cord, and the CO2 sensor is connected to the LED display screen through the data transmission line.

[0012] Furthermore, the peristaltic pump is used to circulate deep soil gas within the collection bottle and sensor housing, ensuring thorough mixing so that the gas can be directly monitored by the CO2 sensor. The CO2 sensor can then display the measured data directly on an LED display screen.

[0013] Furthermore, the internal space of the sensor housing is approximately 17cm. 3 It only accommodates CO2 sensors.

[0014] Furthermore, the gas collection bottle has four through holes with a diameter of 3cm around its perimeter.

[0015] On the other hand, embodiments of the present invention provide an operating method for a device for real-time monitoring of CO2 in deep soil, comprising the following steps:

[0016] Step 1: Place the CO2 sensor in the sensor protective housing and secure it.

[0017] Step 2: Cut the gas transmission tube to the preset length, pass one end through the through hole on the gas collection bottle cap and extend it into the gas collection bottle.

[0018] Step 3: Seal the connection between the gas transmission tube and the through hole on the gas collection bottle cap with hot melt adhesive to prevent gas leakage.

[0019] Step 4: Cut the gas transfer tube to the preset length and connect the peristaltic pump to the gas collection bottle;

[0020] Step 5: Cut the gas transmission tube to the preset length and connect the peristaltic pump and the CO2 sensor;

[0021] Step 6: Cut the first power cord and the second power cord to the preset length and connect the peristaltic pump to the power supply, the first power cord sensor to the power supply, the first power cord sensor to the LED display screen, and the LED display screen to the power supply respectively.

[0022] Step 7: Use a soil drill to dig a hole suitable for the gas collection bottle to pass through;

[0023] Step 8: Place the gas collection device in and bury it, leaving the gas transmission pipe exposed above the ground;

[0024] Step 9: After connecting the exposed gas transmission pipe to the CO2 sensor, gas transmission pipe, and peristaltic pump, turn on the power to start setting the monitoring frequency and monitoring time period, and display the data directly on the LED display.

[0025] The beneficial effects of the embodiments of the present invention are:

[0026] This invention provides a device and its operation method for real-time monitoring of CO2 in deep soil. The device can collect CO2 gas from soil at different depths, offering high efficiency and timeliness. This invention facilitates timely monitoring of CO2 emissions and emission patterns at different soil depths, enabling accurate and timely acquisition of CO2 gas emissions from soil at various depths. It can be used to study the impacts of land use change on soil carbon dynamics and ecosystem functions, soil fertility and nutrient cycling, changes in microbial activity and community structure, and responses to environmental factors (such as temperature, humidity, and nutrients). The device is simple to manufacture, requires no specialized technical personnel for customization, and the depth of gas collection can be adjusted according to requirements. It is easy to operate and install. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a device for real-time monitoring of CO2 in deep soil.

[0029] Figure 2 The real-time data monitored by the deep soil CO2 real-time monitoring device of the present invention at a soil depth of 20cm is as follows:

[0030] Figure 3 The real-time data monitored by the deep soil CO2 real-time monitoring device of the present invention at a soil depth of 60cm is as follows:

[0031] Figure 4 This is the real-time data monitored by the deep soil CO2 real-time monitoring device of the present invention at a soil depth of 100cm.

[0032] In the diagram: 1-CO2 sensor; 2-sensor protective housing; 3-peristaltic pump; 4-gas transmission tube; 5-gas cylinder filter; 6-gas collection bottle; 7-power supply; 8-first power line; 9-second power line; 10-data transmission line; 11-LED display screen. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Please refer to Figure 1 The first embodiment of the present invention provides a real-time monitoring configuration in which the measured data is directly displayed on an LED display screen. An embodiment of the present invention provides a device for real-time monitoring of CO2 in deep soil, including a CO2 sensor 1, a sensor housing 2, a peristaltic pump 3, a gas transmission pipe 4, a gas cylinder filter 5, a gas collection bottle 6, a power supply 7, a power cord, a data transmission line 10, and an LED display screen 11. The CO2 sensor 1 is connected to the peristaltic pump 3 via the gas transmission pipe 4, and the peristaltic pump 3 is connected to the gas collection bottle 6 via the gas transmission pipe 4. A gas cylinder filter 5 is installed on the outside of the gas collection bottle 6 to prevent solid impurities from clogging the air inlet. The peristaltic pump 3 is connected to the power supply 7 via a first power cord 8, the CO2 sensor 1 is connected to the power supply 7 via a second power cord 9, and the CO2 sensor 1 is connected to the LED display screen 11 via the data transmission line 10.

[0035] Furthermore, the peristaltic pump 3 is used to circulate deep soil gas within the collection bottle 6 and the sensor housing 2, and the thoroughly mixed gas can be directly monitored by the CO2 sensor 1. The CO2 sensor 1 can directly display the measured data on the LED display screen 11.

[0036] Furthermore, the internal space of the sensor housing 2 is approximately 17cm. 3 It only accommodates CO2 sensor 1.

[0037] Furthermore, the gas collection bottle 6 has four through holes with a diameter of 3cm around its perimeter.

[0038] On the other hand, embodiments of the present invention provide an operating method for a device for real-time monitoring of CO2 in deep soil, comprising the following steps:

[0039] Step 1: Place the CO2 sensor 1 in the sensor protective housing 2 and secure it.

[0040] Step 2: Cut the gas transmission tube 4 to a preset length, pass one end through the through hole on the gas collection bottle 6 cap and extend into the gas collection bottle 6.

[0041] Step 3: Seal the connection between the gas transmission tube 4 and the through hole on the cap of the gas collection bottle 6 with hot melt glue to prevent gas leakage.

[0042] Step 4: Cut the gas transmission tube 4 to the preset length and connect the peristaltic pump 3 to the gas collection bottle 6;

[0043] Step 5: Cut the gas transmission tube 4 to the preset length and connect the peristaltic pump 3 to the CO2 sensor 1;

[0044] Step 6: Cut the first power cord 8 and the second power cord 9 to the preset length and connect the peristaltic pump 3 to the power supply 7, the first power cord sensor 1 to the power supply 7, the first power cord sensor 1 to the LED display screen 11, and the LED display screen 11 to the power supply 7 respectively.

[0045] Step 7: Use a soil drill to dig a hole suitable for the gas collection bottle 6 to pass through;

[0046] Step 8: Place the gas collection device in and bury it, leaving the gas transmission pipe 4 exposed above the ground;

[0047] Step 9: After connecting the exposed gas transmission pipe 4 to the CO2 sensor 1, the gas transmission pipe 4, and the peristaltic pump 3, turn on the power supply 7 to start setting the monitoring frequency and monitoring time period and directly display the data on the LED display 11.

[0048] Table 1 shows the monitoring data for a selected period of time. From a time perspective, the recorded time span is from 3:00 AM on January 14, 2025 to 10:00 PM on January 16, 2025. The specific time points include 3:00 AM, 9:00 AM, 1:00 PM, 6:00 PM and 10:00 PM every day.

[0049] Table 1. Results of soil CO2 concentration and temperature measurements

[0050]

[0051] Regarding temperature, the values ​​fluctuated between 0.65℃ (22:00 on January 16, 2025) and 2.10℃ (18:00 on January 14, 2025), showing some fluctuations. For example, on January 14, the temperature first dropped from 1.40℃ at 3:00 to 1.32℃ at 9:00, and then rose to 1.62℃ at 13:00.

[0052] The CO2 concentration ranged from 1573 ppm (9:00 AM on January 16, 2025) to 1712 ppm (6:00 PM on January 14, 2025). Overall, the CO2 concentration fluctuated, with relatively higher concentrations on January 14 and relatively lower concentrations on January 16.

[0053] The invention provides a configuration for real-time monitoring and data display that can accurately obtain the amount of CO2 gas emitted from different depths in the soil, and features high data acquisition frequency and high measurement accuracy.

[0054] On the other hand, embodiments of the present invention provide a method for real-time collection of soil CO2 at different depths in a vineyard, comprising the following steps:

[0055] The first step is to connect the gas transmission tube of the preset length to the gas collection bottle, the peristaltic pump, and the CO2 sensor respectively;

[0056] The second step is to connect the CO2 sensor and soil temperature sensor to the DTU, and connect the DTU to the gateway; pre-configure basic information, data settings, network settings and other parameters through the cloud platform.

[0057] The third step is to fix the gas collection bottle, the end of the CO2 sensor, and the end of the soil temperature sensor in place and place them into holes at different depths in the soil of the vineyard.

[0058] Furthermore, the preset lengths of the gas transmission tube are: 70cm, 90cm, 150cm (distance from the gas collection bottle to the peristaltic pump outlet); 20cm (distance from the peristaltic pump outlet to the CO2 sensor); 80cm, 100cm, 160cm (distance from the gas collection bottle to the CO2 sensor);

[0059] Furthermore, the number of holes suitable for the gas collection bottle to pass through is 3;

[0060] Furthermore, the depths of the holes suitable for the gas collection bottles to pass through are 20, 40, and 60 cm respectively;

[0061] Once connected and powered on, it can automatically monitor CO2 concentration and soil temperature and store data in the cloud.

[0062] like Figure 2 , 3 As shown in Figure 4:

[0063] Figure 2These are real-time data monitored by the equipment at a soil depth of 20cm. Temperature exhibits periodic fluctuations, with a daily average variation ranging from 0.5℃ to 4.1℃. The lowest value occurred on January 17th (0.5℃), and the highest value occurred on January 24th (4.1℃). The temperature gradually increases over time, with lower temperatures from January 14th to 17th, followed by a significant increase after January 18th, reaching a peak on January 23rd. Daily temperatures are lower at night (03:00) and higher during the day (13:00-18:00), consistent with typical diurnal variations in soil temperature. CO2 concentration fluctuates between 1565ppm and 1793ppm, with an average of 1658ppm, showing an overall upward trend. The lowest value was 1565ppm at 13:00 on January 15th, and the highest value was 1793ppm at 03:00 on January 24th. From January 14th to 17th, CO2 concentration remained relatively stable, between 1560 and 1680ppm.

[0064] Figure 3 These are real-time data monitored by the equipment at a soil depth of 60cm, with a temperature range between 2.8℃ and 4.72℃, significantly higher than the data at a depth of 20cm (0.5℃-4.1℃), indicating that the temperature fluctuation in deeper soil layers is smaller and more stable. Temperature changes exhibit three phases: a relatively stable period from January 14th to 16th (3.03℃~3.40℃), a significant drop in temperature from January 17th to 18th (lowest point 2.80℃), and a sustained warming phase after January 19th, reaching a peak of 4.72℃ on January 24th. Regarding diurnal variation, the lowest daily temperature mostly occurs at 03:00 or 09:00, while the highest temperature is concentrated at 13:00 or 18:00, showing a typical diurnal rhythm of soil temperature variation. Daily temperature fluctuations are small (within ±0.5℃), with no significant diurnal difference, reflecting the thermal inertia of deeper soil layers. CO2 concentrations ranged from 2095 ppm to 2637 ppm, with an average of 2336 ppm, significantly higher than at a depth of 20 cm (average 1677 ppm), reflecting limited gas diffusion and organic matter decomposition and accumulation in deeper soil layers. Initial concentrations were high on January 14th (2310–2383 ppm), subsequently decreasing to a minimum of 2095 ppm on January 17th. The average CO2 concentration at a depth of 60 cm was higher than at 20 cm, indicating gas accumulation with depth in the soil profile. Temperature variations were smaller at 60 cm, reflecting the thermal buffering effect of deeper soil layers.

[0065] Figure 4These are real-time data monitored by the equipment at a soil depth of 100cm, showing a gradual upward trend in temperature. January 14-16 was a relatively stable period (2.91–3.30℃), followed by a cooling process on January 17-18 (lowest temperature 2.79℃), and then a sustained warming phase from January 19 onwards, reaching a peak of 4.6℃ on January 24. Daily temperature fluctuations were small, typically within the range of 0.1–0.3℃, indicating relatively stable ambient temperatures. The lowest temperature occurred on January 17 (2.79℃), and the highest temperature occurred on January 24 (4.6℃). CO2 concentration fluctuated between 1418ppm and 1736ppm, with an average of 1575.12ppm. The initial concentration was high on January 14 (1586–1736ppm), subsequently showing a fluctuating downward trend, reaching a minimum of 1418ppm at 22:00 on January 17. After January 18, as temperatures rose, carbon dioxide concentrations began to fluctuate and rise, reaching a later peak of 1729 ppm at 13:00 on January 23, indicating that temperature may drive soil respiration.

[0066] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A device for real-time monitoring of CO2 in deep soil, characterized in that, The device includes a CO2 sensor (1), a sensor housing (2), a peristaltic pump (3), a gas transmission pipe (4), a gas cylinder filter (5), a gas collection bottle (6), a power supply (7), a power cord, a data transmission line (10), and an LED display screen (11). The CO2 sensor (1) is connected to the peristaltic pump (3) through the gas transmission pipe (4), and the peristaltic pump (3) is connected to the gas collection bottle (6) through the gas transmission pipe (4). A gas cylinder filter (5) is installed on the outside of the gas collection bottle (6) to prevent solid impurities from clogging the air inlet. The peristaltic pump (3) is connected to the power supply (7) through the first power cord (8), and the CO2 sensor (1) is connected to the power supply (7) through the second power cord (9). The CO2 sensor (1) is connected to the LED display screen (11) through the data transmission line (10).

2. The device for real-time monitoring of CO2 in deep soil according to claim 1, characterized in that, The peristaltic pump (3) is used to circulate deep soil gas in the collection bottle (6) and the sensor housing (2).

3. The device for real-time monitoring of CO2 in deep soil according to claim 1, characterized in that, The internal space of the sensor housing (2) is 17cm. 3 It is only used to house the CO2 sensor (1).

4. The device for real-time monitoring of CO2 in deep soil according to claim 1, characterized in that, The gas collection bottle (6) has a mouth diameter of 3.2cm, a height of 8cm, a body diameter of 5cm, and four through holes with a diameter of 3cm around its perimeter.

5. A method for operating the device for real-time monitoring of CO2 in deep soil as described in claim 1, characterized in that, Includes the following steps: Step 1: Place the CO2 sensor (1) in the sensor protective shell (2) and fix it in place; Step 2: Cut the gas transmission tube (4) to a preset length, pass one end through the through hole on the gas collection bottle (6) cap and extend into the gas collection bottle (6); Step 3: Seal the connection between the gas transmission tube (4) and the gas collection bottle (6) with hot melt glue to prevent gas leakage. Step 4: Cut the gas transmission tube (4) to the preset length and connect the peristaltic pump (3) to the gas collection bottle (6); Step 5: Cut the gas transmission tube (4) to the preset length and connect the peristaltic pump (3) and the CO2 sensor (1); Step 6: Cut the first power cord (8) and the second power cord (9) to the preset length and connect the peristaltic pump (3) to the power supply (7), the first power cord sensor (1) to the power supply (7), the first power cord sensor (1) to the LED display screen (11), and the LED display screen (11) to the power supply (7). Step 7: Use a soil drill to dig a hole suitable for the gas collection bottle (6) to pass through; Step 8: Place the gas collection device in and bury it, leaving the gas transmission pipe (4) exposed above the ground; Step 9: After connecting the exposed gas transmission pipe (4) to the CO2 sensor (1), gas transmission pipe (4), and peristaltic pump (3), turn on the power (7) to start setting the monitoring frequency and monitoring time period and display the data directly on the LED display (11).

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