Aerobic zone soil carbon flux multi-point synchronous monitoring device and method

Abstract

The application discloses a kind of vadose zone soil carbon flux multi-point synchronous monitoring device and method, including with the outside monitoring terminal wireless connection of a base station main body, with a base station main body wireless connection of several groups of acquisition module, acquisition module includes the box of bottom hollow and is arranged on the intelligent sensor group for collecting gas data in box;The gas analysis equipment is arranged in the base station main body, and the input end of gas analysis equipment is connected with the sampling port on the outer wall of several groups of box by several groups of connecting pipeline respectively, and the sample collection mechanism is arranged in the base station main body.The each box of the application is connected with gas analysis equipment by connecting pipeline, and the data acquisition range is improved by gas analysis equipment combined with the intelligent sensor group on the box, and the gas data collected by the intelligent sensor group can be calibrated by periodic gas extraction analysis, to ensure the accuracy and quality of acquisition data.

Description

Technical Field

[0001] This invention relates to the field of soil monitoring technology, specifically to a device and method for simultaneous multi-point monitoring of soil carbon flux in the vadose zone. Background Technology

[0002] The vadose zone is the core area for soil respiration (CO2 emissions) and organic carbon decomposition. Its carbon flux directly affects the carbon balance of terrestrial ecosystems, so it is necessary to monitor the soil carbon flux in the vadose zone.

[0003] Currently, the static box method is commonly used to monitor soil carbon flux in the vadose zone of a monitoring area. This involves placing multiple monitoring boxes at different locations in the soil within the monitoring area to conduct simultaneous multi-point monitoring. However, this method has the following drawbacks:

[0004] 1. Most of them only use the intelligent sensor group (gas sensor, etc.) in the monitoring box for real-time monitoring, but using a sensor alone has the disadvantages of single data and inability to be calibrated;

[0005] 2. The inability to effectively collect gas samples from different monitoring chambers limits the quantitative analysis of complex gas components and subsequent laboratory verification, resulting in a serious lack of data traceability.

[0006] To address this, we propose a multi-site synchronous monitoring device and method for soil carbon flux in the vadose zone. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-point synchronous monitoring device and method for soil carbon flux in the vadose zone, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A multi-point synchronous monitoring device for soil carbon flux in the vadose zone includes a base station body wirelessly connected to an external monitoring terminal, and several sets of acquisition modules wirelessly connected to the base station body. Each acquisition module includes a hollow box at the bottom and a set of intelligent sensors installed on the box for collecting gas data inside the box.

[0010] The base station body is equipped with a gas analysis device. The input end of the gas analysis device is connected to a number of sampling ports on the outer wall of the box through a number of connecting pipes. The base station body is equipped with a sample collection mechanism, which includes a rotating seat driven by a rotating device, a number of clamping parts arranged in a ring array on the rotating seat for clamping the gas bag body, a gas bag feeding part, an air outlet part, and a pushing part arranged in sequence above the rotating seat along its rotation direction inside the base station body. The air outlet part is connected to a number of connecting pipes through a number of connecting branch pipes, and a solenoid valve is installed in the connecting branch pipe.

[0011] A further improvement is that the intelligent sensor group includes a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor, and an air temperature sensor.

[0012] A further improvement is that the clamping part includes:

[0013] The support frame is mounted on the rotating seat. It has symmetrically sliding limit plates at both ends on one side. A guide block is movably inserted through the two sets of limit plates. The long side of the guide block is perpendicular to the long side of the limit plate. When the guide block contacts one side of the air bag body, the air inlet end of the air bag body is on the path corresponding to the air outlet. The end of the guide block is connected to the support frame. The opposite sides of the two sets of limit plates are respectively connected to the support frame through an elastic element. When the air bag body expands, it drives the limit plates to move and squeeze the elastic element.

[0014] A further improvement is that the air outlet includes:

[0015] The gas collecting seat is connected to the connecting branch pipe and the inner wall of the base station body. The gas collecting seat is connected to a connector for being fitted onto the air inlet end of the air bag body through a hose. The air inlet end of the air bag body is equipped with a one-way valve. The outer wall of the connector is fitted with a movable bracket, and the movable bracket is connected to the gas collecting seat through an elastic element.

[0016] An electromagnetic ring, located on the gas collecting base, is used to energize and attract the movable support upwards, thereby separating the connector from the air inlet end of the gas bag body.

[0017] A positioning plate is slidably mounted on the bottom of a movable support. The positioning plate is equipped with a detection sensor for contacting a limiting plate in a clamping part. The detection sensor is electrically connected to a controller. The coupling joint is equipped with a second solenoid valve. The second solenoid valve and the solenoid ring are both electrically connected to the controller. When the detection sensor contacts the limiting plate, the controller controls the second solenoid valve and the solenoid ring to close. This causes the movable support to move upward, pulling the positioning plate and the coupling joint upward, so that the detection sensor separates from the limiting plate and the coupling joint separates from the air inlet end of the air bag body.

[0018] The adjusting screw is threaded into the bottom of the movable bracket, and one end is rotatably connected to the positioning plate. It is used to adjust the position of the detection sensor.

[0019] A further improvement is that the air bag feeding section includes:

[0020] The placement seat contains several air bag bodies. One end of the placement seat is connected to a guide seat for accommodating one air bag body. The guide seat is perpendicular to the placement seat, and one end of the guide seat corresponds to a clamping part. A push plate 1 driven by a telescopic device 2 is movably installed inside the placement seat to push the air bag body inside the placement seat into the guide seat. A push plate 2 driven by a telescopic device 3 is movably installed inside the guide seat to push one air bag body inside the guide seat into the space between two limiting plates in the clamping part.

[0021] A further improvement is that an opening is provided on the outer wall of the guide seat on the side away from the placement seat, and a micro inkjet printer is provided on the outer wall of the guide seat on the side away from the placement seat, with the printing end of the micro inkjet printer corresponding to the opening.

[0022] A further improvement is that a hollow seat is inserted at the center of the rotating seat. The hollow seat is connected to the inner cavity of the limiting plate through a pipe, and is also connected to the input end of the micro negative pressure device through a pipe. Adsorption holes connected to the inner cavities of the two sets of limiting plates are opened on opposite sides of each other.

[0023] A further improvement is that the pusher section includes:

[0024] Telescopic device 1 is connected to the inner wall of the base station body via a connecting frame. The output end of telescopic device 1 is equipped with a push block. The telescopic device 1 is used to drive the push block into the space between the two limiting plates in the clamping part to push the air bag body out of the rotating seat.

[0025] The collection box, located inside the base station body and below the rotating seat, is used to collect the air bag body pushed out by the pusher block.

[0026] A further improvement is that a miniature gas eliminator is provided on the connecting pipeline, and an electric three-way valve is provided between the connecting pipeline and the sampling port of the box. One input end of the electric three-way valve is also connected to a filter element. The electric three-way valve, the miniature gas eliminator, the gas analysis device, the intelligent sensor group, the rotating device, and the sample collection mechanism are all electrically connected to electrical components. The electrical components are located inside the base station body and include: a controller, a wireless communication device, a solenoid valve, and a power supply device.

[0027] A method for simultaneous multi-site monitoring of soil carbon flux in the vadose zone, utilizing the aforementioned monitoring device, includes the following steps:

[0028] S1: Deploy several sets of acquisition modules in the monitoring area and cover the soil at different locations, and deploy the main base station in the area near the several sets of acquisition modules;

[0029] S2: The intelligent sensor group in the acquisition module monitors the gas data inside the box in real time and sends the gas data to the external monitoring terminal for processing and analysis to obtain the soil carbon flux in the vadose zone of the monitoring area.

[0030] S3: The gas analysis equipment periodically detects and analyzes the gas entering from the connecting pipeline to obtain gas verification data, and sends the gas verification data to the external monitoring terminal. The external monitoring terminal periodically calibrates or processes the gas data by analyzing the gas verification data to obtain the vadose zone soil carbon flux in the monitoring area.

[0031] In use, by opening the corresponding solenoid valve, the gas entering from the connecting pipe is introduced into the gas outlet through the corresponding connecting branch pipe. The gas is then injected into the gas bag body held by the corresponding clamping part through the gas outlet to obtain a gas sample. Subsequently, the rotating device drives the rotating seat to rotate so that the gas bag body held by another clamping part corresponds to the gas outlet. At the same time, the gas bag feeding part feeds a new gas bag body into the corresponding clamping part, and the pushing part pushes the gas bag body that has been injected with gas away from the rotating seat.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] Each chamber in this invention is connected to a gas analysis device via connecting pipes. The gas analysis device, combined with the intelligent sensor array on the chamber, not only expands the data acquisition range but also allows for periodic gas extraction and analysis by the gas analysis device, calibrating the gas data collected by the intelligent sensor array and ensuring the accuracy and quality of the collected data. Furthermore, this invention includes a sample collection mechanism. Gas samples from the corresponding chamber can be collected via connecting pipes and branch pipes, and the collected gas samples are injected into the gas bag body held by the clamping part through the gas outlet. This facilitates quantitative analysis of complex gas components and subsequent laboratory verification, aiding in data traceability. Additionally, a gas bag loading part is included. When injecting gas samples into the gas bag body, the loading and unloading of the gas bag body can be performed through the loading and unloading parts, improving ease of use. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the synchronous monitoring device of the present invention;

[0035] Figure 2 For the present invention Figure 1 Partial structural sectional view;

[0036] Figure 3 This is a schematic diagram of the sample collection mechanism of the present invention;

[0037] Figure 4 For the present invention Figure 3 Partial structural bottom view;

[0038] Figure 5 For the present invention Figure 4 Enlarged view of structure A in the image.

[0039] In the diagram: 1. Base station main body; 2. Gas analysis equipment; 3. Box; 4. Intelligent sensor group; 5. Connecting pipeline; 6. Miniature gas extraction device; 7. Rotating seat; 8. Rotating device; 9. Support frame; 10. Limiting plate; 11. Hollow seat; 12. Miniature negative pressure device; 13. Guide block; 14. Elastic component one; 15. Connecting branch pipe; 16. Gas collection seat; 17. Gas bag main body; 18. Telescopic device one; 19. Push block; 20. Placement seat; 21. Guide seat; 22. Telescopic device two; 23. Push plate one; 24. Telescopic device three; 25. Miniature inkjet printer; 26. Elastic component two; 27. Positioning plate; 28. Adjusting screw; 29. ​​Detection sensor; 30. Electromagnetic ring; 31. Connecting joint; 32. Electric three-way valve; 33. Filter element; 34. Electrical components; 35. Collection box. Detailed Implementation

[0040] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Please see the appendix Figure 1 -Appendix Figure 2 A multi-point synchronous monitoring device for soil carbon flux in the vadose zone includes a base station body 1 wirelessly connected to an external monitoring terminal, and several sets of acquisition modules wirelessly connected to the base station body 1. Each acquisition module includes a hollow box 3 at the bottom and an intelligent sensor group 4 installed on the box 3 for collecting gas data inside the box 3. The box 3 is usually made of stainless steel, etc. The bottom of the box 3 is hollow and fitted with a sealing ring. The sealing ring ensures that the box 3 is in close contact with the soil to prevent external gas exchange from interfering with the measurement.

[0043] It should be noted that one side of the base station body 1 has a door.

[0044] Preferably, the intelligent sensor group 4 in this embodiment includes a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor and an air temperature sensor. The above sensors are all conventional devices in the art and will not be described in detail here.

[0045] The intelligent sensor group 4 monitors the soil area inside the box 3 in real time to obtain gas data, including CO2 data and air temperature data, so that the external monitoring terminal can process and analyze the gas data to obtain soil carbon flux data in the vadose zone.

[0046] The base station body 1 houses a gas analysis device 2, which is a conventional device in this field and will not be described in detail here. The input end of the gas analysis device 2 is connected to several sampling ports on the outer wall of the housing 3 via several sets of connecting pipes 5, as shown in the attached figure. Figure 1 and attached Figure 2 As shown, if there are three sets of boxes 3, then the three sets of boxes 3 are connected by three sets of connecting pipes 5 respectively;

[0047] The base station body 1 is equipped with a sample collection mechanism, which includes a rotating seat 7 driven by a rotating device 8, several sets of clamping parts arranged in a ring array on the rotating seat 7 for clamping the air bag body 17, an air bag feeding part, an air outlet part, and a pushing part arranged in sequence above the rotating seat 7 along its rotation direction (specifically clockwise) inside the base station body 1. The air outlet part is connected to several sets of connecting pipes 5 through several sets of connecting branch pipes 15, and a solenoid valve is provided in the connecting branch pipe 15.

[0048] The aforementioned rotating seat 7 can be connected to the inner wall of the base station body 1 via a rotating bracket. The rotating device 8 consists of a motor, a reducer, and a gear structure (including gears and gear rings) that drives the output end of the reducer and the rotating seat 7.

[0049] Users can collect gas samples from the corresponding chamber 3 as needed, so that the gas samples can be brought back to the laboratory for processing (e.g., using high-precision equipment such as gas chromatography-mass spectrometry (GC-MS) or infrared spectrometer to ensure data accuracy) or stored for subsequent verification or in-depth research.

[0050] A method for simultaneous multi-site monitoring of soil carbon flux in the vadose zone, utilizing the aforementioned monitoring device, includes the following steps:

[0051] S1: Deploy several sets of acquisition modules in the monitoring area, covering different soil types, and deploy the base station 1 in the area near the several sets of acquisition modules;

[0052] S2: The intelligent sensor group 4 in the acquisition module monitors the gas data inside the box 3 in real time and sends the gas data to the external monitoring terminal for processing to obtain the soil carbon flux of the vadose zone in the monitoring area.

[0053] S3: The gas analysis device 2 can periodically detect and analyze the gas entering from the connecting pipe 5 to obtain gas verification data, and send the verification data to the external monitoring terminal. The external monitoring terminal periodically calibrates the gas data by using the verification data. In use, by opening the corresponding solenoid valve 1, the corresponding connecting branch pipe 15 can guide the gas entering from the connecting pipe 5 into the gas outlet, and then inject it into the gas bag body 17 held by the corresponding clamping part through the gas outlet to obtain a gas sample. Subsequently, the rotating device 8 drives the rotating seat 7 to rotate so that the gas bag body 17 held by another clamping part corresponds to the gas outlet. At the same time, the gas bag feeding part feeds a new gas bag body 17 into the corresponding clamping part, and the pushing part pushes the gas bag body 17 that has been injected with gas away from the rotating seat 7.

[0054] Example 2

[0055] Please see the appendix Figure 3 -Appendix Figure 5 The clamping part in this embodiment includes:

[0056] The support frame 9 is mounted on the rotating seat 7. Two symmetrically sliding limit plates 10 are mounted on one side of the support frame 9. A guide block 13 is movably inserted through the two sets of limit plates 10. The long side of the guide block 13 is perpendicular to the long side of the limit plate 10. When the guide block 13 contacts one side of the air bag body 17, the air inlet of the air bag body 17 is on the path corresponding to the air outlet. The guide block 13 not only ensures the stable movement of the limit plate 10 but also positions the air bag body 17 between the two sets of limit plates 10, so that the air inlet of the air bag body 17 corresponds to the air outlet. The end of the guide block 13 is connected to the support frame 9. The opposite sides of the two sets of limit plates 10 are connected to the support frame 9 via elastic elements 14 (e.g., springs). When the air bag body 17 expands, it drives the limit plates 10 to move and squeeze the elastic elements 14. When the air bag body 17 separates from the two sets of limit plates 10, the limit plates 10 reset under the action of the elastic elements 14.

[0057] It should be noted that initially, the spacing between the two sets of limiting plates 10 is adapted to the thickness of the uninflated air bag body 17.

[0058] Preferably, the air outlet in this embodiment includes:

[0059] The gas collecting base 16 is connected to the connecting branch pipe 15 and connected to the inner wall of the base station body 1 through the bracket. The gas collecting base 16 is connected to the connector 31 for fitting onto the air inlet end of the air bag body 17 through the hose. The air inlet end of the air bag body 17 is equipped with a one-way valve. Its air inlet end is cylindrical, and the lower vertical section is rectangular and has a certain thickness. For example, it can be an inflatable gas storage bag (flat when not inflated, and expands into a cube after inflation) or a self-standing airbag (the bottom is made of hard plastic (such as PP) or folded cardboard to make a support ring / base so that the bag body is upright, and the bag body is made of high elastic material (such as TPU, PVC coated cloth), which expands outward after inflation). It can also be an airbag made of rubber material, with a bracket (rectangular bracket) inside the airbag. Of course, the air bag body 17 is not limited to the above types.

[0060] The one-way valve at the air inlet of the air bag body 17 prevents gas from escaping from the air bag body 17 when the connector 31 is separated from the air inlet. The outer wall of the air inlet of the air bag body 17 can be threaded, allowing users to reseal it later by screwing on a sealing cap. The inner diameter of the connector 31 matches the outer diameter of the air inlet of the air bag body 17, and a sealing ring is embedded in the inner wall of the connector 31 to ensure a tight seal at the connection point.

[0061] The outer wall of the connector 31 is fitted with a movable bracket, and the movable bracket is connected to the gas collection seat 16 through an elastic element 26 (e.g., a spring).

[0062] Electromagnetic ring 30 is provided on gas collecting base 16 and is used to energize and adsorb the movable support upward, so that the connector 31 is separated from the air inlet end of the air bag body 17. Similarly, when injecting air, by de-energizing electromagnetic ring 30, the movable support is driven downward by elastic element 26, so that the connector 31 is connected to the air inlet end of the air bag body 17.

[0063] Positioning plate 27 is slidably mounted on the bottom of the movable support. Positioning plate 27 is equipped with a detection sensor 29 for contacting a limiting plate 10 in a clamping part. Detection sensor 29 is electrically connected to a controller. This detection sensor 29 is, for example, a pressure sensor. A second solenoid valve is installed inside the connector 31. Both the second solenoid valve and the solenoid ring 30 are electrically connected to the controller. When detection sensor 29 contacts the limiting plate 10, the controller controls the second solenoid valve and the solenoid ring 30 to close. This causes the movable support to move upwards, pulling positioning plate 27 and connector 31 upwards, thus separating detection sensor 29 from the limiting plate 10. 31 separates from the air inlet end of the air bag body 17. As gas enters the air bag body 17, the air bag body 17 begins to expand, and then moves away from its corresponding two sets of limiting plates 10. When one of the limiting plates 10 moves and contacts the detection sensor 29, the controller controls the solenoid valve 2 and the solenoid ring 30, so that no more gas is emitted from the connector 31, and the connector 31 separates from the air inlet end of the air bag body 17. This not only effectively controls the amount of gas injected into the air bag body 17 and prevents the air bag body 17 from being over-inflated and damaged, but also facilitates subsequent inflation of other air bag bodies 17.

[0064] The adjusting screw 28 is threaded into the bottom of the movable bracket, and one end is rotatably connected to the positioning plate 27. It is used to adjust the position of the detection sensor 29. The other end of the adjusting screw 28 is equipped with a handwheel, so that the position of the detection sensor 29 can be adjusted to control the amount of gas injected into the gas bag body 17.

[0065] Preferably, the air bag feeding section of this embodiment includes:

[0066] A placement seat 20 contains several air bag bodies 17. The top of the placement seat 20 has a cover to allow for the replenishment of air bag bodies 17. The air bag bodies 17 are stacked sequentially along the long side of the placement seat 20. One end of the placement seat 20 is connected to a guide seat 21 for accommodating one air bag body 17. The guide seat 21 is perpendicular to the placement seat 20, and one end of the guide seat 21 corresponds to a clamping part. A push plate 23, driven by a telescopic device 22 (e.g., an electric telescopic rod), is movably installed inside the placement seat 20 to push the air bag bodies 17 into the guide seat 21. When the telescopic device 22 is working, it pushes several air bag bodies 17 inside the placement seat 20... The air bag body 17 moves synchronously toward the guide seat 21 until the air bag body 17 closest to the guide seat 21 enters the guide seat 21. At this time, the telescopic device 22 closes. In order to facilitate the control of the telescopic device 22, in practice, a pressure sensor that contacts the air bag body 17 can be installed on the inner wall of the guide seat 21. This will not be described in detail here. The guide seat 21 is equipped with a push plate 2 that is driven by the telescopic device 3 24 (e.g., an electric telescopic rod). This push plate 2 is used to push one air bag body 17 in the guide seat 21 into the space between the two limiting plates 10 in the clamping part. Then, the telescopic device 3 24 drives the push plate 2 to push the air bag body 17 in the guide seat 21 to the space between the corresponding two limiting plates 10.

[0067] Preferably, in this embodiment, the outer wall of the guide seat 21 away from the placement seat 20 has an opening, and a micro inkjet printer 25 is provided on the outer wall of the guide seat 21 away from the placement seat 20. The printing end of the micro inkjet printer 25 corresponds to the opening. The micro inkjet printer 25 is a device used to print characters, numbers or graphics on the surface of a product. It is usually used to identify product information and is a conventional device in this field. It will not be described in detail here. The micro inkjet printer 25 can send a coding instruction to the micro inkjet printer 25 through an external monitoring terminal. The micro inkjet printer 25 prints information on the corresponding air bag body 17. The printed information includes, for example, the name of the box 3, the sampling time, etc., for subsequent use.

[0068] Preferably, in this embodiment, a hollow seat 11 is inserted into the center of the rotating seat 7. The hollow seat 11 is connected to the inner cavity of the limiting plate 10 through a pipe, and is also connected to the input end of the micro negative pressure device 12 through a pipe (which is rotatably connected to the hollow seat 11). The two sets of limiting plates 10 have adsorption holes on opposite sides that are connected to their inner cavities. The micro negative pressure device 12 is, for example, a micro fan. After the air bag body 17 moves into the two sets of limiting plates 10 through the telescopic device 24 and the push plate 2, the micro negative pressure device 12 can generate negative pressure at the adsorption holes to adsorb the air bag body 17, so as to prevent the air bag body 17 from moving when the rotating seat 7 rotates.

[0069] Preferably, the pusher section of this embodiment includes:

[0070] Telescopic device 18 (e.g., electric telescopic pole) is connected to the inner wall of base station body 1 via a connecting frame. The output end of telescopic device 18 is provided with a push block 19. Telescopic device 18 is used to drive the push block 19 into the space between the two limiting plates 10 in the clamping part to push the air bag body 17 out of the rotating seat 7.

[0071] The collection box 35 has a hollow top and is located inside the base station body 1 and below the rotating seat 7. It is used to collect the air bag body 17 pushed out by the pusher block 19. The pusher block 19 is moved by the telescopic device 18, which can push the air bag body 17 away from the rotating seat 7, so that the air bag body 17 falls downward into the collection box 35.

[0072] Example 3

[0073] Please refer to the attached drawings. Based on Embodiment 2, this embodiment has a miniature air intake device 6, such as a miniature fan, installed on the connecting pipe 5. An electric three-way valve 32 is installed between the connecting pipe 5 and the sampling port of the housing 3. One input end of the electric three-way valve 32 is also connected to a filter element 33, such as a pipe and a filter screen installed in the pipe. The electric three-way valve 32, the miniature air intake device 6, the gas analysis device 2, the intelligent sensor group 4, the rotating device 8, and the sample collection mechanism are all electrically connected to an electrical device 34. The electrical device 34 is located in the base station body 1 and includes a controller, a wireless communication device, and a power supply device.

[0074] When gas is detected by gas analysis device 2, the sampling port and the connecting pipeline 5 can be connected by controlling electric three-way valve 32, and the micro gas priming device 6 can be opened. Then, the gas in the box 3 can be detected by gas analysis device 2 or gas sampled by gas sample through sampling port, electric three-way valve 32 and connecting pipeline 5.

[0075] After collecting gas samples, the filter element 33 is connected to the connecting pipe 5 by controlling the electric three-way valve 32. The micro gas eliminator 6, the solenoid valve one in the corresponding connecting branch pipe 15, and the solenoid valve two in the connector 31 are opened, and the gas analysis device 2 is closed. Then, the external gas is filtered by the filter element 33 and then enters the corresponding connecting branch pipe 15, gas collecting seat 16, hose and connector 31 through the electric three-way valve 32 and the connecting pipe 5, and is discharged from the connector 31. This removes the residual gas samples in each pipe, thereby improving the quality of subsequent gas sample collection.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for simultaneous monitoring of vadose zone soil carbon flux at multiple sites, characterized in that, The application relates to a gas monitoring system, which comprises a base station body (1) connected with external monitoring terminals, a plurality of groups of collecting modules connected with the base station body (1), and a plurality of groups of box bodies (3) and a plurality of groups of intelligent sensor groups (4) arranged on the box bodies (3) and used for collecting gas data in the box bodies (3). The base station body (1) is internally provided with a gas analysis device (2), the input end of the gas analysis device (2) is connected with a plurality of groups of sampling ports on the outer walls of the box bodies (3) through a plurality of groups of connecting pipelines (5), the base station body (1) is internally provided with a sample collecting mechanism, the sample collecting mechanism comprises a rotating seat (7) driven to rotate by a rotating device (8), a plurality of groups of clamping portions used for clamping gas bag bodies (17) and arranged in an annular array on the rotating seat (7), a gas bag feeding portion, a gas outlet portion and a pushing portion which are sequentially arranged in the base station body (1) above the rotating seat (7) and along the rotating direction of the rotating seat (7), the gas outlet portion is connected with the connecting pipelines (5) through a plurality of groups of connecting branch pipes (15), and an electromagnetic valve one is arranged in the connecting branch pipes (15). The intelligent sensor group (4) comprises a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor and an air temperature sensor. The clamping portion comprises a bearing frame (9) arranged on the rotating seat (7), limit plates (10) symmetrically and slidably arranged at both ends of one side of the bearing frame (9), a guide block (13) movably and penetratingly arranged on the two groups of limit plates (10), the long side of the guide block (13) is perpendicular to the long side of the limit plate (10), when the guide block (13) is in contact with one side of the gas bag body (17), the gas inlet end of the gas bag body (17) is located on the path corresponding to the gas outlet portion, the end of the guide block (13) is connected with the bearing frame (9), the opposite sides of the two groups of limit plates (10) are connected with the bearing frame (9) through elastic members one (14), and the limit plates (10) are driven to move and press the elastic members one (14) when the gas bag body (17) expands.

2. The monitoring device of claim 1, wherein: The gas outlet portion comprises: A gas collecting seat (16) is connected with the connecting branch pipes (15) and the inner wall of the base station body (1), the gas collecting seat (16) is connected with a butt joint (31) for being sleeved on the gas inlet end of the gas bag body (17) through a hose, a one-way valve is arranged in the gas inlet end of the gas bag body (17), a movable support is sleeved on the outer wall of the butt joint (31) and connected with the gas collecting seat (16) through elastic members two (26); An electromagnetic ring (30) is arranged on the gas collecting seat (16) and used for electrifying and absorbing the movable support upwards, so that the butt joint (31) is separated from the gas inlet end of the gas bag body (17). The positioning plate (27) is slidably arranged at the bottom of the movable support, and a detection sensor (29) for contacting a limiting plate (10) in a clamping part is arranged on the positioning plate (27), the detection sensor (29) is electrically connected with a controller, an electromagnetic valve two is arranged in the counter connector (31), and the electromagnetic valve two and the electromagnetic ring (30) are electrically connected with the controller, when the detection sensor (29) contacts the limiting plate (10), the controller controls the electromagnetic valve two and the electromagnetic ring (30) to be closed, and then the movable support drives the positioning plate (27) and the counter connector (31) upwards, so that the detection sensor (29) is separated from the limiting plate (10), and the counter connector (31) is separated from the gas bag main body (17) gas inlet end; The adjusting screw (28) is threadedly inserted into the bottom of the movable support, and one end thereof is rotatably connected with the positioning plate (27), and is used for adjusting the position of the detection sensor (29).

3. The monitoring device of claim 2, wherein: The gas bag loading part comprises: The placing seat (20) is internally provided with a plurality of gas bag main bodies (17), one end of the placing seat (20) is communicated with a guide seat (21) for accommodating one gas bag main body (17), the guide seat (21) is perpendicular to the placing seat (20), one end of the guide seat (21) corresponds to a clamping part, the placing seat (20) is movably provided with a push plate one (23) driven to move by a telescopic device two (22), for pushing the gas bag main body (17) in the placing seat (20) into the guide seat (21), the guide seat (21) is movably provided with a push plate two driven to move by a telescopic device three (24), for pushing the gas bag main body (17) in the guide seat (21) into the two limiting plates (10) in the clamping part.

4. The monitoring device of claim 3, wherein: A through opening is formed in the outer wall of the side of the guide seat (21) away from the placing seat (20), and a micro code spraying device (25) is arranged on the outer wall of the side of the guide seat (21) away from the placing seat (20), and the printing end of the micro code spraying device (25) corresponds to the through opening.

5. The monitoring device of claim 1, wherein: The center of the rotating seat (7) is provided with a hollow seat (11), the hollow seat (11) is communicated with the inner cavities of the limiting plates (10) through pipelines, and the input end of a micro negative pressure device (12) is also communicated through a pipeline, and the opposite sides of the two limiting plates (10) are both provided with suction holes communicated with the inner cavities thereof.

6. The monitoring device of claim 1, wherein: The pushing part comprises: The telescopic device one (18) is connected with the inner wall of the base station main body (1) through a connecting frame, and the output end of the telescopic device one (18) is provided with a push block (19), the telescopic device one (18) is used for driving the push block (19) to enter between the two limiting plates (10) in the clamping part to push out the gas bag main body (17) from the rotating seat (7); The collecting box (35) is arranged in the base station main body (1) and located below the rotating seat (7), and is used for collecting the gas bag main body (17) pushed out by the push block (19).

7. The monitoring device of claim 1, wherein: The connecting pipeline (5) is provided with a micro air induction device (6), an electric three-way valve (32) is arranged between the connecting pipeline (5) and the sampling port of the box body (3), one input end of the electric three-way valve (32) is further connected with a filter element (33), the electric three-way valve (32), the micro air induction device (6), the gas analysis device (2), the intelligent sensor group (4), the rotating device (8) and the sample collection mechanism are electrically connected with an electric device (34), the electric device (34) is arranged in the base station main body (1), and the electric device (34) comprises a controller, a wireless communication device, an electromagnetic valve and a power supply device.

8. A method for simultaneously monitoring carbon fluxes in a vadose zone soil at multiple sites using the monitoring device according to any one of claims 1 to 7. The method comprises the following steps: S1: a plurality of groups of collecting modules are arranged in a monitoring area and cover the soil at different positions, and the base station main body (1) is arranged in the vicinity of the plurality of groups of collecting modules; S2: the intelligent sensor group (4) in the collecting module monitors the gas data in the box body (3) in real time, and sends the gas data to an external monitoring terminal for processing and analysis, so as to obtain the soil carbon flux of the aeration zone in the monitoring area; S3: the gas analysis device (2) detects and analyzes the gas entering from the connecting pipeline (5) periodically, obtains gas verification data, and sends the gas verification data to the external monitoring terminal, the external monitoring terminal periodically calibrates or processes the gas verification data to the gas data, and obtains the soil carbon flux of the aeration zone in the monitoring area; Wherein, when in use, by opening the corresponding electromagnetic valve, the corresponding connecting branch pipe (15) guides the gas entering from the connecting pipeline (5) into the gas outlet, and then the gas outlet is injected into the gas bag main body (17) clamped by the corresponding clamping part, so as to obtain the gas sample, then the rotating device (8) drives the rotating rotating seat (7), so that the gas bag main body (17) clamped by the other clamping part corresponds to the gas outlet, and the gas bag feeding part feeds the new gas bag main body (17) into the corresponding clamping part, and the pushing part pushes the gas bag main body (17) which has been injected into the gas away from the rotating seat (7).

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