A soil greenhouse gas emission flux detection experimental system

Abstract

The present invention relates to a soil greenhouse gas emission flux detection experimental system, which belongs to the field of air pollution detection. The experimental system is used to detect the soil greenhouse gas emission flux in potted plants. The system includes a gas analysis device, a static dark box corresponding to the potted plants, and a gas collection device. The static dark box is used to collect greenhouse gases emitted from the potted plants in a closed manner. The greenhouse gas samples in the static dark box are collected into the gas analysis device through the gas collection device. A soil turning mechanism is provided in the static dark box. The present invention first conducts a preliminary experiment on potted plants that have not been applied with soil conditioners through the experimental system, then applies different soil conditioners to the potted plants with consistent test results, and conducts a formal soil greenhouse gas emission flux detection experiment. The soil turning mechanism is used to evenly distribute the soil conditioners, thereby reducing experimental errors and improving the accuracy of soil greenhouse gas emission flux detection under the application of different soil conditioners.

Description

Technical Field

[0001] The present invention belongs to the field of air pollution detection, and in particular relates to a soil greenhouse gas emission flux detection experimental system under the application of different soil conditioners. Background Art

[0002] The large-scale emission of greenhouse gases is one of the important factors causing air pollution. Among them, the accumulation of greenhouse gases such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) will intensify the greenhouse effect, leading to a series of environmental problems such as rising global temperatures, frequent extreme weather events, and rising sea levels. As an important component of terrestrial ecosystems, soil has also become a source of greenhouse gas emissions through processes such as microbial activity and plant metabolism. In order to reduce soil greenhouse gas emissions, scientists have proposed a strategy of applying soil conditioners to the soil. Soil conditioners can improve soil structure, regulate microbial activity, increase carbon fixation, etc., thereby reducing greenhouse gas emissions. The existing soil greenhouse gas emission flux detection experimental system can, to a certain extent, monitor the greenhouse gases emitted by soil ecology into the air, and evaluate the carbon emissions of soil and ecosystems by collecting and analyzing greenhouse gas-related data.

[0003] However, the existing soil greenhouse gas emission flux detection experimental system has shortcomings when dealing with the detection of different types of soil amendments. Since different soil amendments have different effects on soil microbial activity, nutrient cycling and gas emission mechanisms, there are differences in soil quality, microorganisms in the soil and the growth activities of plants and animals for different experimental objects, and there are a lot of human error factors in the application process of soil amendments. It is difficult for the existing experimental system to accurately capture these changes, which affects the accuracy of the test results. It can be seen that the existing experimental system is difficult to achieve a comprehensive evaluation of the application effects of multiple soil amendments. Therefore, there is an urgent need for an experimental system that can more accurately and effectively measure soil greenhouse gas emission fluxes for different soil amendments, so as to provide a more scientific basis for soil management and greenhouse gas emission reduction measures. Summary of the Invention

[0004] The purpose of the present invention is to provide a soil greenhouse gas emission flux detection experimental system in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A soil greenhouse gas emission flux detection experimental system is provided, which is used to detect soil greenhouse gas emission flux in potted plants. The experimental system includes a gas analysis device, and a static dark box and a gas sampling device corresponding to the potted plants. The static dark box is used to collect greenhouse gases emitted from the potted plants in a closed manner. The greenhouse gas samples in the static dark box are collected into the gas analysis device through the gas sampling device. A soil turning mechanism is provided in the static dark box, and a driving member for driving the soil turning mechanism is provided on the static dark box, and a bulking mechanism is fixed on the output shaft of the driving member.

[0007] The experimental system first conducts a preliminary experiment on several potted plants that have not been applied with soil amendments, then uses a static dark box to seal the space above the potted plants, and uses a gas sampling device to collect greenhouse gas samples in the static dark box and transfer them to a gas analysis device at multiple time points to conduct a soil greenhouse gas emission flux test. The experimental system then conducts a formal experiment on some or all of the potted plants with consistent test results, again uses a static dark box to seal the space above the potted plants, and uses a driving part to drive a bulking mechanism and a soil turning mechanism to disperse and evenly distribute the soil amendment. At multiple time points, the greenhouse gas samples in the static dark box are collected by the gas sampling device and transfer them to a gas analysis device to conduct a secondary soil greenhouse gas emission flux test, and the soil greenhouse gas emission fluxes under the application of different soil amendments are calculated to analyze the effects of different soil amendments on the soil greenhouse gas emission fluxes of the potted plants.

[0008] As a further optimization scheme of the present invention, the static dark box includes a box body and a feeding assembly arranged on the top of the box body and corresponding to the bulking mechanism. The top of the potted plant is provided with an annular water trough corresponding to the box body, and the feeding assembly is used to introduce the soil conditioner into the bulking mechanism.

[0009] As a further optimization scheme of the present invention, the bulk material mechanism includes a material receiving barrel and a discharge port arranged at the bottom of the material receiving barrel, and blades fixed on the side wall of the material receiving barrel, and the blades are used to mix the gas during gas extraction. A locking mechanism is provided on the top of the soil turning mechanism, and the soil turning mechanism is coupled to the output shaft of the driving part through the locking mechanism; in the soil conditioner application stage, the locking mechanism locks the soil turning mechanism and the driving part, and in the gas extraction preparation stage, the locking mechanism releases the lock between the soil turning mechanism and the driving part.

[0010] As a further optimization scheme of the present invention, the feeding assembly includes a feeding channel fixed on the top of the box body, the feeding channel discharge port is fan-shaped, and a diverter is fixed in the feeding channel discharge port, and the diverter is used to divert the soil improver to both sides of the receiving tube.

[0011] As a further optimization scheme of the present invention, the driving member includes a motor fixed to the top of the box, a driving rod fixed to the output end of the motor, and a connecting tube fixed to the bottom end of the driving rod, and a socket is provided on the side wall of the connecting tube. The locking mechanism includes a shell fixed to the top of the support frame, a locking block slidingly arranged inside the shell, and a linear driving component for driving the locking block to embed into the socket, and a plug block corresponding to the connecting tube is provided on the top of the support frame, and a countersunk hole corresponding to the locking block is provided on the side wall of the plug block.

[0012] As a further optimization scheme of the present invention, the soil turning mechanism includes a door-type support frame, two assembly shafts respectively arranged at the bottom of both sides of the support frame, a number of turning claws fixed on the assembly shafts, a first bevel gear fixed at the end of the assembly shaft away from the axis of the box body, a second bevel gear meshed with one side of the first bevel gear, and a transmission gear fixedly connected to the second bevel gear. A gear ring meshed with the transmission gear is fixed on the inner wall of the box body, and the transmission gear is rotatably arranged at the bottom of the support frame.

[0013] As a further optimization solution of the present invention, a bracket is provided on the inner side of the upper part of the box body, and suspension components are provided on both sides of the top of the support frame, and the suspension components are overlapped on the bracket.

[0014] As a further optimization scheme of the present invention, the suspension assembly includes an inverted L-shaped mounting frame, a limiting member fixed to one end of the mounting frame, and a roller arranged at the bottom of the limiting member. The inner side of the bracket protrudes upward to form an annular side wall, and one side of the limiting member is in contact with the annular side wall of the bracket.

[0015] As a further optimization scheme of the present invention, the gas sampling device includes a syringe and a sealing tube mounted on the syringe needle. A needle hole is opened on the side wall of the syringe needle. The sealing tube is used to seal the needle hole of the syringe, and the sealing tube is spring-connected to the syringe barrel of the syringe. A sample outlet assembly is provided on the box body, and the sample outlet assembly includes a sample outlet and an outer cylinder body arranged on the inner side of the sample outlet, and a sealing assembly arranged inside the outer cylinder body. The outer cylinder body is used to stop the sealing tube when the syringe needle is inserted into the sample outlet assembly, and the sealing assembly is used to close the outer cylinder body when the syringe needle is pulled out of the sample outlet assembly.

[0016] As a further optimization scheme of the present invention, a base support is provided under the static dark box, and the base support includes a water storage container that is mounted on the outside of the potted plant, and a positioning piece fixed to the outside of the water storage container. The bottom of the box body is provided with supporting legs corresponding to the positioning pieces, and locking pieces are provided between the supporting legs and the corresponding positioning pieces.

[0017] The beneficial effects of the present invention are:

[0018] 1) Before applying a soil conditioner for the experiment, the present invention first conducts a preliminary experiment on several potted plants that have not been treated with the soil conditioner, screens out potted plants with consistent pre-experimental test results, applies the soil conditioner to these potted plants, and conducts a greenhouse gas emission flux experiment, thereby reducing the impact of differences in soil quality, microorganisms, and plants and animals in each potted plant on the detection experiment. When applying the soil conditioner, the soil conditioner is evenly distributed through a soil turning mechanism in a static dark box, thereby reducing the impact of human factors on the experimental results and improving the accuracy of soil greenhouse gas emission flux detection under the application of different soil conditioners;

[0019] 2) The present invention applies soil conditioner through a driving member in conjunction with a dispersing mechanism and a soil turning mechanism. The dispersing mechanism not only disperses the soil conditioner into the potted plants but also mixes the gas in the static dark box during the gas collection process. During the soil conditioner application phase, a locking mechanism locks the soil turning mechanism and the driving member. During the gas collection preparation phase, the locking mechanism releases the lock between the soil turning mechanism and the driving member, reducing the load on the driving member, improving the gas mixing efficiency, and preventing damage to the system during the mixing process.

[0020] 3) The present invention drives the scattering mechanism to disperse the soil conditioner through a single driving member. The driving member is also used to drive the support frame. The support frame drives the assembly shaft and the turning claw to move circumferentially around the axis of the potted plant. The gear ring transmission structure and the bevel gear transmission structure simultaneously drive the assembly shaft and the turning claw to turn, so that the soil conditioner is evenly distributed in the potted plant. The scattering mechanism can also cooperate with the driving member to mix the gas before gas collection, saving the power source required for the system. After the support frame is unlocked from the driving member, it is mounted under the bracket through an upwardly extending suspension assembly. The suspension assembly mounting frame is used to increase the height of the roller to avoid interference between the scattering mechanism and the turning mechanism. The internal structure of the static dark box is reasonably arranged.

[0021] 4) The needle hole of the syringe in the gas sampling device of the present invention is located on the side wall of the needle, and the gas sampling device is sealed by a sealing tube. The outer cylinder blocks the sealing tube when the syringe needle is inserted into the sampling assembly, exposing the needle hole to the sampling assembly. After the needle is removed from the sampling assembly, the sealing tube is reset to seal the greenhouse gas sample. The sealing assembly automatically closes the sampling assembly when gas is not being sampled. When greenhouse gas emission flux detection experiments of multiple soil amendments are conducted simultaneously, the gas composition changes during the storage of gas samples caused by the lack of a gas analysis device are significantly reduced.

[0022] 5) The legs of the static dark box of the present invention can, on the one hand, support and lift the box body when the static dark box is removed, and on the other hand, can cooperate with the bottom bracket to lock the box body. The bottom bracket can not only support the potted plants and provide moisture to the soil in the potted plants, but also reinforce the legs through the positioning parts and the locking parts, thereby improving the stability of the driving parts when driving the bulk material mechanism and the soil turning mechanism, and avoiding the failure of the water seal between the potted plants and the static dark box due to the vibration of the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of the static dark box of the present invention;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 It is a structural schematic diagram of the soil turning mechanism of the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0029] Figure 7 It is a schematic diagram of the internal structure of the bulk material mechanism and the locking mechanism of the present invention;

[0030] Figure 8 is an exploded view of the feed assembly of the present invention;

[0031] Figure 9 It is a schematic diagram of the internal structure of the sample output component of the present invention;

[0032] Figure 10 It is a schematic diagram of the bottom support structure viewed from above of the present invention.

[0033] In the figure: 1. Gas analysis device; 2. Static dark box; 3. Gas collection device; 4. Soil turning mechanism; 5. Driving part; 6. Bulk material mechanism; 7. Locking mechanism; 8. Bottom support; 21. Box body; 22. Feed assembly; 23. Bracket; 24. Sample discharging assembly; 25. Support leg; 26. Locking part; 31. Syringe; 32. Sealing tube; 33. Limiting cylinder; 41. Support frame; 42. Assembly shaft; 43. Turning claw; 44. First bevel gear; 45. Second bevel gear; 46. Transmission gear; 47. Ring gear; 48. Suspension assembly; 49. Forming frame; 51. Motor; 52. Drive Moving rod; 53, connecting tube; 54, jack; 61, receiving tube; 62, discharge port; 63, blade; 71, shell; 72, locking block; 73, first electromagnet; 74, second electromagnet; 81, water storage container; 82, positioning member; 221, feed channel; 222, diverter; 223, sealing plug; 241, sample outlet; 242, outer cylinder; 243, inner cylinder; 244, sealing sleeve; 245, pressure rod; 246, stop plate; 247, stop ring; 481, mounting frame; 482, limit member; 483, roller; F, potted plant; P, pinhole; I, plug. DETAILED DESCRIPTION

[0034] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] Example

[0036] like Figure 1-4 As shown, this embodiment relates to a soil greenhouse gas emission flux detection experimental system, which is used to detect the soil greenhouse gas emission flux in multiple potted plants F. The soil greenhouse gas in this embodiment refers to the greenhouse gas emitted into the air by the soil ecology in the potted plants F. The experimental system includes a gas analysis device 1, and a static dark box 2 and a gas collection device 3 corresponding to the potted plants F. The static dark box 2 is used to collect the greenhouse gases emitted from the potted plants F in a sealed manner. The greenhouse gas samples in the static dark box 2 are collected into the gas analysis device 1 through the gas collection device 3. The gas analysis device 1 is preferably a gas chromatograph, and the model of the gas chromatograph is preferably Agilent 7890A. The connection between the static dark box 2 and the potted plants F is sealed in a water seal. A soil turning mechanism 4 is provided in the static dark box 2, and the soil turning mechanism 4 is used to evenly distribute the soil conditioner applied in the potted plants F.

[0037] The static darkroom 2 is equipped with a driver 5. The drive shaft of the driver 5 extends through the top of the static darkroom 2, and a bulking mechanism 6 is fixedly mounted on the output shaft of the driver 5. The static darkroom 2 includes a housing 21, a feed assembly 22 located on the top of the housing 21 and corresponding to the bulking mechanism 6, and a sample discharge assembly 24 located on the top of the housing 21. The feed assembly 22 is used to introduce soil conditioner into the bulking mechanism 6. The driver 5 is used to drive the bulking mechanism 6 to apply the soil conditioner to the potted plants F and drive the tillage mechanism 4 to evenly distribute the soil conditioner. An annular water trough corresponding to the housing 21 is located on the top of each potted plant F. A temperature sensor is installed within the static darkroom 2. The bulking mechanism 6 includes a receiving tube 61, a discharge port 62 located at the bottom of the tube 61, and blades 63 fixed to the sidewalls of the tube 61. The blades 63 are used to mix the gas during gas extraction. A locking mechanism 7 is located on the top of the tillage mechanism 4, and the tillage mechanism 4 is coupled to the output shaft of the driver 5 via the locking mechanism 7.

[0038] The experiment conducted on the potted plant F by this experimental system is divided into a preliminary experiment and a formal experiment. Specifically, the preliminary experiment sets multiple gas collection time nodes, and the time periods before and after each gas collection time node correspond to the gas collection preparation stage and the gas collection stage respectively; the formal experiment also sets multiple gas collection time nodes, and also has multiple corresponding gas collection preparation stages and gas collection stages. At the beginning of the formal experiment, there is also a soil conditioner application stage, during which the experimental system disperses and evenly distributes the soil conditioner. During the soil conditioner application stage, the locking mechanism 7 locks the soil turning mechanism 4 and the drive member 5; during the gas collection preparation stage, the locking mechanism 7 releases the lock between the soil turning mechanism 4 and the drive member 5. The material receiving tube 61 is provided with at least two discharge ports 62. In this embodiment, two discharge ports 62 are provided, and the two discharge ports 62 are symmetrically arranged on both sides of the bottom of the material receiving tube 61. This experimental system is mainly suitable for potted plants with plants whose roots are located inside the soil and whose stems are relatively straight. For potted plants with plants that easily interfere with the soil turning mechanism 4, the plants in the pot can be removed and the soil conditioner can be applied. The soil conditioners used in this embodiment include biochar, bentonite, humic acid, and straw mixed with a straw composting agent.

[0039] Before applying the soil conditioner for the experiment, a preliminary experiment was conducted on several potted plants F that had not been treated with the soil conditioner. That is, the experimental system was used to conduct a soil greenhouse gas emission flux detection experiment on several potted plants F that had not been treated with the soil conditioner. The potted plants F with consistent detection results were screened out through the preliminary experiment. During the preliminary experiment, pure water was injected into the annular water tank of each potted plant F, and the box 21 of each static dark box 2 was embedded in the water tank of the corresponding potted plant F. In the gas collection preparation stage before the gas collection time node, the driving member 5 drove the material receiving cylinder 61 to rotate, so that the material receiving cylinder 61 rotated the blades 63 to mix the gas in the box 21. Then, the gas collection stage began. The gas in the box 21 was collected by the gas collection device 3 into a gas chromatograph. The gas chromatograph was connected to a host computer for calculating greenhouse gas emission fluxes. The host computer was connected to a temperature sensor in the box 21. After the preliminary experiment, the soil greenhouse gas emission flux was calculated by the host computer. In this embodiment, four gas collection stages are set, and the time interval between adjacent gas collection time nodes is preferably 7 minutes. The calculation formula of soil greenhouse gas emission flux is as follows:

[0040]

[0041] Where F is the soil greenhouse gas emission flux, ρ represents the density of soil greenhouse gas under standard conditions, H represents the height of the static dark box 2, and T represents the average temperature in the box during sampling. Represents the rate of change of soil greenhouse gas concentration over time.

[0042] During the preliminary experiment, the locking mechanism 7 does not lock the soil turning mechanism 4 and the driving member 5. It should be noted that the consistency of the above-mentioned test results does not mean that the soil greenhouse gas emission flux results are exactly the same, but rather that the soil greenhouse gas emission flux results are approximately equal. Specifically, in this embodiment, after the preliminary experiment is completed, the potted plants F corresponding to the maximum and minimum values ​​of the measured soil greenhouse gas emission flux are first screened out, and the soil greenhouse gas emission fluxes of the remaining potted plants F are averaged. Then, the potted plants whose difference between the soil greenhouse gas emission flux and the above average value is greater than a set value are screened out. The set value is preferably 5% of the above average value. Finally, a plurality of potted plants F with consistent soil greenhouse gas emission flux test results are obtained, and then a formal soil greenhouse gas emission flux test experiment is carried out.

[0043] In the formal experiment, different soil conditioners were applied to the potted plants F with consistent test results, and secondary soil greenhouse gas emission flux detection was performed. One potted plant F was selected from the potted plants F with consistent test results as the control group, and multiple groups of potted plants F corresponding to various soil conditioners were selected from the remaining potted plants F as the experimental group. Secondary soil greenhouse gas emission flux detection was performed on the potted plants F corresponding to the experimental group and the control group. The beginning of the experiment corresponded to the soil conditioner application stage. In this stage, the soil turning mechanism 4 and the driving member 5 were locked by the locking mechanism 7, and the soil conditioner was introduced into the bulking mechanism 6 from the feeding assembly 22. The bulking mechanism 6 and the soil turning mechanism 4 were driven to rotate by the driving member 5. The soil conditioner in the bulking mechanism 6 flowed out from the discharge port 62 under the action of centrifugal force and was dispersed to the soil surface in the potted plant F. The soil conditioner was evenly distributed in the upper soil area of ​​the potted plant F by the soil turning mechanism 4. The locking mechanism 7 released the lock between the soil turning mechanism 4 and the driving member 5. Gas mixing and sampling were then performed before and after each gas sampling time point in the formal experiment. These sampling time points were set identically to those in the pre-experiment. During the gas sampling preparation phase, the driver 51 rotated the material receiving cylinder 61 and blades 63 to mix the gas within the chamber 21. Then, during the gas sampling phase, the gas within the chamber 21 was collected into a gas chromatograph via the gas sampling device 3. After each gas sampling phase, the host computer calculated the greenhouse gas emission fluxes of the soil treated with different soil amendments. Based on these emission flux calculations, the effectiveness of the different soil amendments in controlling air pollution was determined.

[0044] Preferably, see Figure 8 The feeding component 22 includes a feeding channel 221 fixed on the top of the box body 21. The discharge port of the feeding channel 221 is fan-shaped, and a diverter 222 is fixed in the discharge port of the feeding channel 221. The diverter 222 is used to divert the soil improver to both sides of the material receiving tube 61. The diverter 222 is preferably a V-shaped dividing plate. The upper end of the feeding channel 221 is the feeding port, and a sealing plug 223 is provided on the feeding port. Before introducing the soil improver, a certain amount of soil improver is weighed, and the sealing plug 223 on the feeding port is pulled out, and the weighed soil improver is introduced into the feeding channel 221. The soil improver is diverted to both sides of the material receiving tube 61 under the action of the dividing plate, thereby further improving the uniformity of the soil improver dispersed by the bulking mechanism 6.

[0045] Specifically, if Figure 4-7As shown, the soil turning mechanism 4 includes a door-shaped support frame 41, two assembly shafts 42 rotatably mounted on the bottom of each side of the support frame 41, a plurality of material turning claws 43 fixedly mounted on the assembly shaft 42, a first bevel gear 44 fixedly mounted on the end of the assembly shaft 42 away from the axis of the housing 21, a second bevel gear 45 meshing with one side of the first bevel gear 44, and a transmission gear 46 fixedly connected to the second bevel gear 45. A gear ring 47 meshing with the transmission gear 46 is fixedly mounted on the inner wall of the housing 21, and the transmission gear 46 is rotatably mounted on the bottom of the support frame 41. A crossbar is provided at the bottom of each side of the support frame 41, and the two assembly shafts 42 are rotatably connected to the bottom of the two crossbars through the brackets. The transmission gear 46 is fixedly connected to the second bevel gear 45 via a connecting shaft, and the top of the connecting shaft is rotatably connected to the end of the crossbar of the support frame 41, so that the transmission gear 46 is rotatably mounted on the bottom of the support frame 41. The bottom of the support frame 41 is also provided with a circular or polygonal shaping frame 49. In this embodiment, the shaping frame 49 is hexagonal. Two crossbars extend through the bottom of the support frame 41 on either side of the shaping frame 49, and the crossbars at the bottom of the support frame 41 are fixed to the shaping frame 49. The driving member 5 includes a motor 51 whose housing is fixed to the top of the housing 21, a driving rod 52 fixed to the output end of the motor 51, and a connecting tube 53 fixed to the bottom end of the driving rod 52. The connecting tube 53 has a sidewall provided with a socket 54. The driving rod 52 and the connecting tube 53 constitute the driving shaft of the driving member 5. The locking mechanism 7 includes a housing 71 fixed to the top of the support frame 41, a locking block 72 slidably disposed within the housing 71, and a linear drive component for driving the locking block 72 into the socket 54. An insert block 1 corresponding to the connecting tube 53 is provided at the top of the support frame 41, and a countersunk hole corresponding to the locking block 72 is provided on the sidewall of the insert block 1. The linear drive component includes a first electromagnet 73 fixed to one end of the inner side of the housing 71, and a second electromagnet 74 spring-connected to the first electromagnet 73. The housing 71 has an opening on a side away from the first electromagnet 73. The second electromagnet 74 is slidably mounted on the inner side of the housing 71, near the opening. A locking block 72 is fixedly connected to the second electromagnet 74. The front and rear side walls of the locking block 72 are in contact with the inner wall of the housing 71. The inner wall of the housing 71 is provided with an anti-slip layer to prevent the locking block 72 from being inserted into the jack 54 during gas mixing. In addition, in other embodiments, the linear drive component can also be replaced with a telescopic device such as an electric push rod, a pneumatic cylinder, or an oil cylinder.

[0046] A bracket 23 is provided on the inner side of the upper portion of the housing 21. Suspension assemblies 48 are provided on both sides of the top of the support frame 41. The suspension assemblies 48 are connected to the bracket 23, and the bracket 23 is used to support the support frame 41. The suspension assembly 48 includes an inverted L-shaped mounting frame 481, a stopper 482 fixed to one end of the mounting frame 481, and a roller 483 disposed at the bottom of the stopper 482. The inner side of the bracket 23 protrudes upward to form an annular side wall, and one side of the stopper 482 is in contact with the annular side wall of the bracket 23. The inverted L-shaped mounting frame 481 increases the height of the roller 483 to prevent soil conditioner spilled from the discharge port 62 of the material receiving barrel 61 from falling onto the bracket 23. In addition, in this embodiment, when the bulking mechanism 6 disperses the soil conditioner, the output ends of the motor 51 rotate at different speeds to make the distribution of the soil conditioner more uniform, thereby improving the effect of the soil turning mechanism 4 in evenly distributing the soil conditioner.

[0047] During the gas mixing process, the first and second electromagnets 73 and 74 remain de-energized, the locking block 72 is located inside the housing 71, and the motor 51 drives the driving rod 52, the material receiving tube 61, and the blades 63 on the material receiving tube 61 to rotate, thereby evenly mixing the gas in the static dark box 2. Before evenly distributing the soil conditioner, the motor 51 drives the driving rod 52 and the connecting tube 53 to rotate. At the same time, the first and second electromagnets 73 and 74 are energized, repelling each other. The second electromagnet 74 overcomes the spring force and pushes the locking block 72 toward the axis of the connecting tube 53. When the socket 54 of the connecting tube 53 faces the locking block 72, the locking block 72 passes through the socket 54 of the connecting tube 53 under the thrust of the second electromagnet 74. After passing through the socket 54, the locking block 72 is embedded in the countersunk hole on the insert block 1, thereby firmly locking the soil turning mechanism 4 and the driving member 5 together. When evenly distributing the soil conditioner, the motor 51 rotates the support frame 41 via the drive rod 52 and the connecting tube 53. The support frame 41 drives the assembly shaft 42 and the transmission gear 46 to rotate circumferentially around the potted plant F. Simultaneously, the transmission gear 46, meshing with the ring gear 47, rotates, driving the second bevel gear 45 to rotate. The second bevel gear 45 meshes with the first bevel gear 44, causing the assembly shaft 42 to rotate around the axis of the potted plant F while simultaneously turning, thereby evenly mixing the soil conditioner into the upper soil layer within the potted plant F. After the soil conditioner is evenly distributed, the motor 51 stops, the two electromagnets 73 and 74 are de-energized, and the second electromagnet 74 is reset by the spring, causing the locking block 72 to retract into the housing 71.

[0048] Furthermore, if Figure 9As shown, the gas collection device 3 includes a syringe 31, which includes a syringe barrel, a piston slidably mounted inside the syringe barrel, a piston rod fixed to the piston, and a needle mounted at the end of the syringe barrel. The gas collection device 3 also includes a sealing tube 32 mounted on the needle of the syringe 31. The side wall of the syringe needle 31 is provided with a needle hole P. The sealing tube 32 is used to seal the needle hole P of the syringe 31, and the sealing tube 32 is spring-connected to the syringe barrel of the syringe 31. The sample outlet assembly 24 includes a sample outlet 241 and an outer cylinder 242 mounted inside the sample outlet 241, as well as a sealing assembly mounted inside the outer cylinder 242. The outer cylinder 242 is used to stop the sealing tube 32 when the syringe needle 31 is inserted into the sample outlet assembly 24, and the sealing assembly is used to seal the outer cylinder 242 when the syringe needle 31 is removed from the sample outlet assembly 24. A socket is provided at the center of the top wall of the outer cylinder 242. The sealing assembly includes an inner cylinder 243 fixed to the bottom of the top wall of the outer cylinder 242, a sealing sleeve 244 sleeved on the outside of the inner cylinder 243, and a pressure rod 245 fixed to the top and outside of the sealing sleeve 244. The sealing sleeve 244 is spring-connected to the top wall of the outer cylinder 242. The end of the syringe barrel of the syringe 31 is provided with a stopper 33 corresponding to the pressure rod 245. The inner cylinder 243 corresponds to the position of the socket and forms an inner cavity that intersects with the socket. A through hole is provided at the bottom of the inner cylinder 243, corresponding to the needle hole P of the syringe 31. This through hole is connected to the inner cavity of the inner cylinder 243.

[0049] When collecting greenhouse gas samples, the stopper 33 is placed on the pressure rod 245. At this point, the needle of the syringe 31 is facing the socket of the outer cylinder 242. The syringe 31 is pressed downward, and the needle of the syringe 31 passes through the socket and enters the lumen of the inner cylinder 243. Simultaneously, the pressure rod 245 pushes the sealing sleeve 244 downward, releasing the sealing sleeve 244 from its sealing effect on the through hole in the inner cylinder 243. The syringe 31 is pressed downward until the needle hole P is connected to the through hole. The piston rod of the syringe 31 is pulled to collect the greenhouse gas sample. After collection is complete, the syringe 31 is removed. The sealing tube 32 returns to its original position under the elastic force of the spring on the syringe 31, resealing the needle hole P in the needle. The sealing sleeve 244 returns to its original position under the elastic force of the spring in the outer cylinder 242, resealing the through hole in the inner cylinder 243. The gas in each syringe 31 is then sequentially injected into the gas chromatograph for greenhouse gas analysis. In addition, a stop plate 246 is fixedly provided at the bottom end of the inner cylinder 243. The stop plate 246 is used to align the sealing sleeve 244, making it easier for the user of the syringe 31 to control the insertion depth of the needle.

[0050] In this embodiment, the outer cylinder 242 is fixed to the sample outlet 241 in a screw connection to facilitate replacement of the internal structure of the sample outlet assembly 24. A sealing structure is provided between the outer cylinder 242 and the sample outlet 241, and the sealing structure is preferably a raw tape. A stop ring 247 is provided on the inside of the sample outlet 241 to fit the outer cylinder 242. In addition, in some other embodiments, the gas sampling device 3 can also be replaced with an automatic sampling device for a gas chromatograph.

[0051] Also, see Figure 10 A base 8 is provided below the static darkroom 2. The base 8 includes a water container 81 that fits over the outside of the potted plant F, and a positioning member 82 fixed to the outside of the water container 81. A through-hole is provided on the bottom wall of the potted plant F, through which a water-absorbing rope is provided to replenish water from the water container 81 into the soil within the potted plant F. One or more through-holes are provided at the bottom of the potted plant F, and the number of water-absorbing ropes can be set as needed. Support legs 25 are provided at the bottom of the box body 21, corresponding one-to-one with the positioning members 82, and locking members 26 are provided between the support legs 25 and the corresponding positioning members 82. In other embodiments, the base 8 can also be a supporting structure that does not have the ability to store water.

[0052] The positioning member 82 is generally plate-shaped, and a groove for accommodating the legs 25 is provided on the side away from the water storage container 81. The locking member 26 is preferably a threaded fastener. When the static dark box 2 is placed on the potted plant F, the box body 21 is embedded in the annular water groove at the top of the potted plant F, and the legs 25 at the bottom of the box body 21 are respectively embedded in the grooves of each positioning member 82, and the legs 25 are locked together with the positioning member 82 by threaded fasteners.

[0053] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A soil greenhouse gas emission flux detection experimental system, the experimental system is used to detect the soil greenhouse gas emission flux in potted plants, the experimental system comprises a gas analysis device (1), and a static dark box (2) and a gas sampling device (3) corresponding to each potted plant, the static dark box (2) is used to collect greenhouse gases emitted from the potted plants in a sealed manner, and the greenhouse gas samples in the static dark box (2) are collected into the gas analysis device (1) by the gas sampling device (3), and the characteristics are: A soil turning mechanism (4) is provided in the static dark box (2), a driving member (5) for driving the soil turning mechanism (4) is provided on the static dark box (2), and a bulking mechanism (6) is fixed on the output shaft of the driving member (5); The experimental system first conducts a preliminary experiment on a number of potted plants that have not been treated with soil conditioners, and then uses a static dark box (2) to seal the space above the potted plants. At multiple time points, the gas sampling device (3) collects greenhouse gas samples in the static dark box (2) and transfers them to the gas analysis device (1) to conduct a soil greenhouse gas emission flux test. The experimental system then conducts a formal experiment on some or all of the potted plants with consistent test results, and then uses the static dark box (2) to seal the space above the potted plants again. The driving member (5) drives the dispersing mechanism (6) and the soil turning mechanism (4) to disperse and evenly distribute the soil conditioner, and then uses the gas sampling device (3) to collect greenhouse gas samples in the static dark box (2) and transfer them to the gas analysis device (1) at multiple time points to conduct a secondary soil greenhouse gas emission flux test. The static dark box (2) comprises a box body (21) and a feeding assembly (22) provided on the top of the box body (21) and corresponding to the bulking mechanism (6); an annular water trough corresponding to the box body (21) is provided on the top of the potted plant; the feeding assembly (22) is used to introduce the soil conditioner into the bulking mechanism (6); The bulking mechanism (6) includes a material receiving barrel (61) and a material outlet (62) provided at the bottom of the material receiving barrel (61), and blades (63) fixed on the side wall of the material receiving barrel (61), wherein the blades (63) are used to mix the gas during gas extraction. A locking mechanism (7) is provided on the top of the soil turning mechanism (4), and the soil turning mechanism (4) is coupled to the output shaft of the driving member (5) through the locking mechanism (7); in the soil conditioner application stage, the locking mechanism (7) locks the soil turning mechanism (4) and the driving member (5), and in the gas extraction preparation stage, the locking mechanism (7) releases the lock between the soil turning mechanism (4) and the driving member (5); The feed assembly (22) includes a feed channel (221) fixedly mounted on the top of the box body (21), a discharge port of the feed channel (221) being fan-shaped, and a diverter (222) fixedly mounted in the discharge port of the feed channel (221), the diverter (222) being used to divert the soil improver to both sides of the receiving cylinder (61); The driving member (5) includes a motor (51) fixed to the top of the box (21), a driving rod (52) fixed to the output end of the motor (51), and a connecting tube (53) fixed to the bottom end of the driving rod (52), and a socket (54) is provided on the side wall of the connecting tube (53). The locking mechanism (7) includes a shell (71) fixed to the top of the support frame (41), a locking block (72) slidably arranged inside the shell (71), and a linear driving component for driving the locking block (72) to embed into the socket (54). The top of the support frame (41) is provided with a plug corresponding to the connecting tube (53), and the side wall of the plug is provided with a countersunk hole corresponding to the locking block (72); The soil turning mechanism (4) includes a door-shaped support frame (41), two assembly shafts (42) respectively rotatably arranged at the bottom of both sides of the support frame (41), a plurality of material turning claws (43) fixedly arranged on the assembly shafts (42), a first bevel gear (44) fixedly arranged at one end of the assembly shaft (42) away from the axis of the box body (21), a second bevel gear (45) meshed with one side of the first bevel gear (44), and a transmission gear (46) fixedly connected to the second bevel gear (45), a gear ring (47) meshed with the transmission gear (46) fixedly arranged on the inner wall of the box body (21), and the transmission gear (46) is rotatably arranged at the bottom of the support frame (41).

2. The soil greenhouse gas emission flux detection experimental system according to claim 1, characterized in that: A bracket (23) is provided on the inner side of the upper portion of the box body (21), and suspension components (48) are provided on both sides of the top of the support frame (41), and the suspension components (48) are overlapped on the bracket (23).

3. The soil greenhouse gas emission flux detection experimental system according to claim 2, characterized in that: The suspension assembly (48) includes an inverted L-shaped mounting frame (481), a limiting member (482) fixed to one end of the mounting frame (481), and a roller (483) arranged at the bottom of the limiting member (482). The inner side of the bracket (23) protrudes upward to form an annular side wall, and one side of the limiting member (482) is in contact with the annular side wall of the bracket (23).

4. The soil greenhouse gas emission flux detection experimental system according to claim 1, characterized in that: The gas sampling device (3) includes a syringe (31) and a sealing tube (32) sleeved on the needle of the syringe (31). A needle hole is opened on the side wall of the needle of the syringe (31). The sealing tube (32) is used to seal the needle hole of the syringe (31), and the sealing tube (32) is spring-connected to the syringe barrel of the syringe (31). A sample outlet assembly (24) is provided on the box (21). The sample outlet assembly (24) includes a sample outlet (241) and an outer cylinder (242) arranged inside the sample outlet (241), and a sealing assembly arranged inside the outer cylinder (242). The outer cylinder (242) is used to stop the sealing tube (32) when the needle of the syringe (31) is inserted into the sample outlet assembly (24). The sealing assembly is used to close the outer cylinder (242) when the needle of the syringe (31) is pulled out of the sample outlet assembly (24).

5. The soil greenhouse gas emission flux detection experimental system according to claim 1, characterized in that: A bottom support (8) is provided below the static dark box (2), and the bottom support (8) includes a water storage container (81) sleeved on the outside of the potted plant, and a positioning member (82) fixed to the outside of the water storage container (81). The bottom of the box body (21) is provided with supporting legs (25) corresponding to the positioning members (82) one by one, and a locking member (26) is provided between the supporting legs (25) and the corresponding positioning members (82).

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