Dynamic box detection system for measuring gas exchange between plant and atmosphere

Abstract

The utility model provides a dynamic box detection system for measuring gas exchange between a plant and the atmosphere, and relates to the technical field of detection of gas released or settled by the plant, the system comprises a blank control box and a plant box for accommodating the plant, and the plant box is communicated with a first gas inlet pipe and a first gas outlet pipe; a second air inlet pipe and a second air outlet pipe are communicated in the contrast box; the air pump communicates with the first air inlet pipe and the second air inlet pipe and is used for supplying air with the same concentration to the two box bodies at the same time. The gas analyzer is communicated with the first gas outlet pipe and the second gas outlet pipe, the gas concentration in the contrast box and the plant box is detected through the gas analyzer, meanwhile, the gas inlet flow rate and leaf area data are collected, and the gas release or sedimentation rate between the plant and the atmosphere is calculated through a formula; the system can quickly and effectively reflect the rate of gas exchange between the plant and the atmosphere under the normal stress-free condition, so that the system is mainly used for reflecting the short-term response of the gas flux to the environmental change.

Description

TECHNICAL FIELD

[0001] The utility model relates to the detection technical field that plant released or the gas of settlement, especially in a kind of determination plant and the dynamic box detection system of gas exchange between atmosphere. BACKGROUND

[0002] Vegetation is an important part of the earth's ecosystem, and the gas exchange between vegetation and atmosphere plays an important role in regulating atmospheric composition. By observing the gas flux between plants and atmosphere, scientists can more accurately understand the gas exchange process between vegetation and atmosphere, thereby deeply understanding the mechanism of global material circulation, which is crucial for predicting and responding to climate and environmental changes. The earth's surface is covered with vegetation, and small changes in gas exchange between vegetation and atmosphere can have a significant impact on the global. With the changes of global climate and environment, the monitoring of gas exchange between plants and atmosphere can provide scientific data for government departments to help policymakers make more reasonable and effective management policies.

[0003] The existing plant-atmosphere gas exchange monitoring device often places in vitro or living plants in a closed static chamber, allowing the plants to rest in the chamber for a period of time, and calculating the exchange rate by monitoring the change of gas concentration in the chamber. However, this system has the following shortcomings: 1) carbon dioxide depletion occurs in the chamber under light conditions, and water vapor accumulates due to plant transpiration, resulting in increased temperature, so the plant may be stressed, and the results obtained do not represent the normal condition of the plant; 2) for a certain gas, whether it is absorbed or released during the resting period, due to the lack of air flow, the concentration of the gas may not change linearly in the case of excessive accumulation or consumption, and it cannot represent the true situation; 3) due to the need for a period of rest, the exchange flux monitored is not sensitive to environmental changes, and cannot reflect the real-time gas exchange information. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of determination plant and the dynamic box detection system of gas exchange between atmosphere, to solve the problems existing in the prior art. The dynamic box system is connected to the on-line instrument at the gas outlet of two box bodies to detect the gas composition in the plant box and the control box, and according to the concentration difference, gas flow rate and leaf area data of the two, the release or settlement rate of the gas is calculated by using the formula. If the water vapor concentration is measured, the transpiration rate can be calculated; if the carbon dioxide concentration is measured, the photosynthetic rate can be calculated; if other gases are measured, the exchange flux of the gas can be directly calculated.

[0005] In order to achieve the above object, the utility model provides the following scheme: provide a kind of dynamic box detection system for determining gas exchange between plant and atmosphere, comprising: experimental box, the experimental box includes blank control box and the plant box of containing plant, the plant box is connected with first air inlet pipe and first air outlet pipe;The control box is connected with second air inlet pipe and second air outlet pipe;Air pump, the air pump is communicated with the first air inlet pipe and the second air inlet pipe;Gas analyzer can determine multiple gas components, the gas analyzer is communicated with the first air outlet pipe and the second air outlet pipe.

[0006] Preferably, the volume of the box is not fixed size, under the condition of not affecting the growth of the plant, the smaller the volume of the box, the higher the sensitivity.The average residence time is controlled within 5 minutes is more ideal.The dynamic box volume is designed as 70 liters in the example, the gas flow rate is 20 liters / min, and the average residence time of gas in the box is 70 / 20=3.5 minutes.

[0007] Preferably, the first air inlet pipe and the second air inlet pipe are provided with flow controllers for adjusting the flow of gas, and an overflow valve is provided between the air pump and the flow controller.

[0008] Preferably, the first air outlet pipe and the second air outlet pipe are respectively connected with a first air pump and a second air pump, and the first air pump and the second air pump are communicated with the gas analyzer through a switching valve.

[0009] Preferably, the top of the experimental box is provided with a first fan, and the fan blades of the first fan are located inside the experimental box.

[0010] Preferably, the side wall of the experimental box is a Teflon film bag, the bottom of the film bag is provided with a binding opening, the top of the film bag is sealed, and the film bag is fixed on a support frame.

[0011] Preferably, the support frame includes an inner frame for fixing the film bag and an outer frame sleeved outside the inner frame, and the outer frame is detachably connected with the inner frame.

[0012] Preferably, the top of the inner frame includes a thickened and less deformed disc piece, the disc piece includes a disc body and a plurality of protruding ear plates arranged around the outer periphery of the disc body, the protruding ear plates are fixedly connected with a first vertical rod, and the first vertical rod is parallel to the axis of the disc piece; the top of the film bag is detachably connected with the disc piece; the outer frame includes a plurality of second vertical rods arranged vertically, and adjacent second vertical rods are fixedly connected through cross bars to ensure that the top does not leak air and facilitates disassembly.

[0013] Preferably, the top surface of the disc piece is provided with a lifting lug, which is detachably connected with the top of the outer frame.

[0014] Preferably, the bottom of the inner frame is provided with an annular piece, the top surface of the annular piece is fixedly connected with the bottom of the first vertical rod, the annular piece is coaxially arranged with the disc piece, the middle part of the annular piece is provided with a central hole for the binding hole to pass through, and the top surface of the annular piece is fixedly connected with the bottom of the first vertical rod.

[0015] Preferably, the first air inlet pipe is provided with a first annular segment at the end of the plant box, the second air inlet pipe is provided with a second annular segment at the end of the control box, and a plurality of air outlet holes are uniformly arranged on the first annular segment and the second annular segment.

[0016] The utility model discloses relative to prior art has obtained following technical effect:

[0017] The utility model discloses a dynamic box system including blank control box and the plant of containing plant, and the plant box is connected with first air inlet pipe and first air outlet pipe, and the control box is connected with second air inlet pipe and second air outlet pipe, and air pump is connected with first air inlet pipe and second air inlet pipe, and is used for the same concentration air of two box body can supply simultaneously, and gas analyzer is connected with first air outlet pipe and second air outlet pipe, and through gas analyzer detects the gas concentration in control box and plant box, and simultaneously gathers the air flow rate and leaf area data, and adopts formula calculation plant and the rate of gas release or settlement between atmosphere. The utility model discloses the advantage lies in: on one hand can in the plant of being tested under the condition of not being threatened real -time accurate determination plant and the gas exchange between atmosphere, on the other hand can also observe and study this gas exchange in short -term response to environmental change. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0019] Figure 1 It is the principle diagram of the utility model;

[0020] Figure 2 It is the principle diagram of the plant box of the utility model;

[0021] Figure 3 It is the whole structure schematic diagram of the utility model;

[0022] Figure 4 It is Figure 3a local enlarged view of;

[0023] Figure 5 is a schematic diagram of the overall structure of the film bag omitted by the utility model;

[0024] Figure 6 is a schematic diagram of the overall structure of the inner layer frame;

[0025] Figure 7 is a schematic diagram of the overall structure of the inner layer frame from another perspective;

[0026] Figure 8 is a schematic diagram of the overall structure from a bottom view;

[0027] Figure 9 is a schematic diagram of the overall structure of the plant box and the control box with the film bag omitted by the utility model;

[0028] Figure 10 is a schematic diagram of the concentration results of the gases CO2, H2O, COS and CO in the two boxes in the embodiment of the utility model;

[0029] Figure 11 is a schematic diagram of the transpiration rate, photosynthetic rate and stomatal conductance calculated in combination with the CO2 concentration difference, H2O concentration difference and leaf temperature in the embodiment of the utility model;

[0030] Figure 12 is a schematic diagram of the fluxes of COS and CO calculated by using the COS concentration difference and CO concentration difference.

[0031] Wherein, 1, plant box; 2, control box; 3, plant; 4, first air inlet pipe; 5, first air outlet pipe; 6, second air inlet pipe; 7, second air outlet pipe; 8, air pump; 9, gas analyzer; 10, flow controller; 11, overflow valve; 12, first air suction pump; 13, second air suction pump; 14, switching valve; 15, first fan; 16, air inlet mixing tank; 17, second fan; 18, first filter membrane; 19, second filter membrane; 20, planting box; 21, Teflon film bag; 22, binding port; 23, inner layer frame; 24, outer layer frame; 25, disc piece; 26, disc main body; 27, protruding ear plate; 28, first vertical rod; 29, second vertical rod; 30, cross rod; 31, lifting lug; 32, connecting rope; 33, annular piece; 34, center hole; 35, first annular segment; 36, second annular segment. DETAILED DESCRIPTION

[0032] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0034] Please refer to Figures 1 to 12 In the embodiment, a detection system for measuring gas exchange between plants and atmosphere is provided, which comprises an experimental box body, the experimental box body comprises a plant box 1 and a control box 2, the plant box 1 is used for accommodating plants 3, the plant box 1 is communicated with a first air inlet pipe 4 and a first air outlet pipe 5, the control box 2 is communicated with a second air inlet pipe 6 and a second air outlet pipe 7, the detection system further comprises an air pump 8, the air outlet end of the air pump 8 is communicated with the first air inlet pipe 4 and the second air inlet pipe 6, and the detection system further comprises a gas analyzer 9, the gas analyzer 9 is used for detecting gas, the gas analyzer 9 is provided with a sample inlet, the sample gas enters the gas analyzer 9 through the sample inlet for detection, the gas analyzer 9 is used for measuring the content of H2O, CO2, N2O, CH4, CO, COS and the like, and the sample inlet of the gas analyzer 9 is communicated with the first air outlet pipe 5 and the second air outlet pipe 7. The side wall of the experimental box body is a transparent Teflon film bag 21 made of Teflon.

[0035] Working principle: the plants 3 are accommodated in the plant box 1, preferably the branches and leaves of the plants are located in the plant box 1, the air pump 8 continuously introduces air into the plant box 1 through the first air inlet pipe 4, the introduction rate is for example 20 liters per minute (L / min), the air continuously washes into the plant box 1, the plants continuously exchange gas with the air in the plant box 1 to generate sample gas, the tested plants exchange gas with the atmosphere under non-stress conditions in the plant box 1; then the sample gas is introduced into the gas analyzer 9 through the first air outlet pipe 5 for detection. The control box 2 is empty, preferably the volume of the control box 2 is consistent with that of the plant box 1, the air pump 8 introduces air into the control box 2 through the second air inlet pipe 6, the control gas in the control box 2 is introduced into the gas analyzer 9 through the second air outlet pipe 7; the gas analyzer 9 detects the gas components in the plant box and the control box, and calculates the gas exchange flux between the plants and the atmosphere based on the test results, so as to observe and study the response of the gas exchange to the environmental changes in a short period of time, and further reflect the subtle influence of environmental changes such as temperature, light, fertilization and irrigation.

[0036] The formula for calculating the gas exchange flux is:

[0037]

[0038] Where F represents the exchange flux of the gas (unit: umol m -2 s -1 ); if ΔC is the difference in water vapor concentration, then F is the transpiration rate; if ΔC is the difference in carbon dioxide concentration, then F is the photosynthetic rate; if ΔC is the difference in concentration of other trace gases, then F is the exchange flux of the trace gas. If ΔC is positive, then F is positive, indicating that the plant is a source of the gas (releasing from the plant), and is negative, indicating that the plant is a sink of the gas (settling to the plant).

[0039] ΔC = C sam - C ref , where C sam and C ref represent the detected gas volume concentrations in the plant chamber and the control chamber, respectively, using ppm (parts per million) as the unit.

[0040] Q represents the air inlet rate of the air inlet (unit: mol s -1 );

[0041] A represents the leaf area of the plant in the chamber (unit: m 2 ).

[0042] In one embodiment, a flow controller 10 for adjusting the gas flow and recording the flow data is arranged on the first air inlet pipe 4 and the second air inlet pipe 6. The gas flow in the first air inlet pipe 4 and the second air inlet pipe 6 can be adjusted through the flow controller 10 to ensure that the gas flow into the plant chamber 1 and the control chamber 2 is consistent. The flow controller 10 is connected to the control device, so that the gas flow can also be adjusted in real time through the control device. Preferably, the flow controller 10 is an MFC flow controller. An overflow valve 11 is arranged between the air pump 8 and the flow controller 10. When the gas flow output by the air pump 8 is significantly greater than the preset flow in the flow controller 10, the excess gas in the first air inlet pipe 4 or the second air inlet pipe 6 is discharged to the outside through the overflow valve 11, maintaining the stability of the pressure in the first air inlet pipe 4 and the second air inlet pipe 6, and avoiding potential problems caused by excessive gas pressure.

[0043] In one embodiment, the first gas outlet pipe 5 of the plant box 1 is connected with the first air extraction pump 12, and the sample gas is extracted from the plant box 1 through the first air extraction pump 12 and input into the gas analyzer 9; the second gas outlet pipe 7 of the control box 2 is connected with the second air extraction pump 13, and the control gas is extracted from the control box 2 through the second air extraction pump 13 and input into the gas analyzer 9. The air outlet ends of the first air extraction pump 12 and the second air extraction pump 13 are connected with the switching valve 14, and then connected to the gas analyzer 9 through the switching valve 14. The switching valve 14 can control the conduction sequence of the first gas outlet pipe 5 and the second gas outlet pipe 7 to the gas analyzer 9, and preferably, the switching valve 14 controls the first gas outlet pipe 5 and the second gas outlet pipe 7 to be connected to the gas analyzer 9 in turn every five minutes.

[0044] In one embodiment, the top of the experimental box body is provided with the first fan 15, that is, the top of the plant box 1 and the control box 2 is provided with the first fan 15, and the fan blade of the first fan 15 is located inside the experimental box body. Preferably, the center line of the rotation of the fan blade of the first fan 15 coincides with or is parallel to the axis of the experimental box body. The rotation of the fan blade can uniformly mix the gas in the experimental box body, and the surface of the fan blade has a Teflon coating. The air inlet end of the air pump 8 is communicated with the air inlet mixing tank 16, which is a cylindrical container. The air inlet mixing tank 16 is filled with compressed air, and a second fan 17 is arranged on the top wall of the air inlet mixing tank 16 to mix the air in the air inlet mixing tank 16. Preferably, the air outlet end of the air pump 8 is communicated with the first air inlet pipe 4 and the second air inlet pipe 6. The gas analyzer 9 in the present example adopts Picarro G2508 and Los Gatos COS / CO online gas analyzer, which can measure the concentrations of water vapor (H2O), carbon dioxide (CO2), carbonyl sulfur (COS) and carbon monoxide (CO). A first filter membrane 18 is arranged between the switching valve 14 and the gas analyzer 9, and a second filter membrane 19 is arranged at the air inlet of the air inlet mixing tank 16. Preferably, the first air inlet pipe 4 and the second air inlet pipe 6 respectively extend to the bottom of the plant box 1 and the control box 2; the first gas outlet pipe 5 and the second gas outlet pipe 7 are respectively communicated with the top of the plant box 1 and the control box 2.

[0045] In one embodiment, the side wall of the experimental box body is a Teflon film bag 21, which is preferably made of polytetrafluoroethylene film. The polytetrafluoroethylene is stable in nature and the surface is not easy to adsorb gas, which can avoid interference with the gas exchange between the plant and the air. The Teflon film bag 21 is transparent, which is to let visible light pass through and not affect the photosynthesis of the plant. The volume of the Teflon film bag is about 0.07m 3(70 liters), that is, the experimental box is surrounded by a Teflon film bag 21, the bottom of the Teflon film bag 21 is provided with a binding port 22, the top of the Teflon film bag 21 is sealed, and the Teflon film bag 21 is fixed on the support frame. The empty box inside the Teflon film bag 21 forms the experimental box, that is, the empty box inside the Teflon film bag 21 forms the plant box 1 and the control box 2, and the binding port 22 of the Teflon film bag 21 is arranged downward.

[0046] In one embodiment, a planting box 20 is arranged below the plant box 1, and the planting box 20 is filled with soil, water and other nutrients. The plant 3 is cultivated by the planting box 20. Preferably, the planting box 20 is arranged directly below the plant box 1, and the two are axially aligned. In specific operation, the roots of the plant 3 are cultivated in the planting box 20, and the branches and leaves of the plant 3 are accommodated in the plant box 1 through the binding port 22. Of course, a potted seedling can be selected to form the planting box 20 and the plant 3. In application, a branch of a large tree can be selected as the plant 3, and cultivated by the planting box 20.

[0047] In the embodiment, the Teflon film bag 21 includes an inner frame 23 and an outer frame 24, the outer frame 24 is sleeved outside the inner frame 23, the Teflon film bag 21 is fixed by the inner frame 23, and the inner frame 23 is detachably connected with the outer frame 24, and the inner frame 23 is supported by the outer frame 24.

[0048] In the embodiment, the top of the inner frame 23 is provided with a disc piece 25, the disc piece 25 is horizontally arranged, the disc piece 25 includes a disc main body 26 and a protruding lug plate 27, the protruding lug plate 27 is uniformly arranged around the outer periphery of the disc main body 26, preferably, the protruding lug plate 27 is provided with four, and the included angle between adjacent protruding lug plates 27 is 90°; the bottom surface of the protruding lug plate 27 is fixed with a first vertical rod 28, the first vertical rod 28 is preferably arranged vertically downward relative to the disc piece 25, and the first vertical rod 28 is parallel to the axis of the disc piece 25; the top of the Teflon film bag 21 is tightly attached to the lower surface of the disc piece 25, and the disc piece 25 is detachably connected with the Teflon film bag 21. The outer frame 24 includes a plurality of second vertical rods 29 arranged vertically, the second vertical rods 29 are parallel to the first vertical rods 28, adjacent second vertical rods 29 are fixedly connected by a cross rod 30, and the cross rod 30 is perpendicular to the second vertical rods 29.

[0049] In the embodiment, the top surface of the disc piece 25 is provided with a lifting lug 31, which is detachably connected to the top of the outer frame 24, preferably, the lifting lug 31 is connected to the crossbar 30 at the top of the outer frame 24 through a connecting rope 32, so that the inner frame 23 is hung in the outer frame 24 and is in a suspended state, and the binding opening 22 at the bottom of the film bag 1 can be tightly bound with the branch part of the plant to form a seal, when the gas flow into the film bag 1 is too large, the binding opening 22 is loosened, so that the film bag 1 is communicated with the outside, avoiding the film bag 1 from being burst.

[0050] In the embodiment, the bottom of the inner frame 23 is provided with an annular piece 33, the top wall of the annular piece 33 is fixedly connected to the bottom of the first vertical rod 28, the first vertical rod 28 can be limited by the annular piece 33, the annular piece 33 is coaxially arranged with the disc piece 25, the middle part of the annular piece 33 is formed with a center hole 34, the binding opening 22 at the bottom of the Teflon film bag 21 can pass through the center hole 34, and the bottom wall of the Teflon film bag 21 can be supported on the side wall of the annular piece 33.

[0051] In the embodiment, the first gas inlet pipe 4 is provided with a first circular ring segment 35 at the end extending into the Teflon film bag 21, preferably, the first circular ring segment 35 is coaxially arranged with the disc piece 25 and the annular piece 33, and a plurality of gas outlet holes are uniformly arranged on the first circular ring segment 35. The second gas inlet pipe 6 is provided with a second circular ring segment 36 at the end extending into the Teflon film bag 21, and a plurality of gas outlet holes are uniformly arranged on the second circular ring segment 36, which is used for uniformly filling gas into the Teflon film bag 21. The support devices for supporting the plant box 1 and the control box 2 are consistent. The Teflon film bag 21 is transparent, and the disc piece 25 is made of organic glass.

[0052] In specific implementation, for example, on May 18-19, 2023, 2-3 years old Quercus mongolica is selected for testing, and the plant 3 is placed in one experimental box body as the plant box 1, and another experimental box body is used as a blank control, that is, as the control box 2. The air pump 8 is used to continuously flush 20 L / min of filtered and uniformly mixed air into the experimental box body, and the pump and the flow controller MFC are installed before entering the experimental box body. The gas in the experimental box body is mixed by a fan, and the gas outlet hole of the air pump is connected to the switching valve 14, one experimental box body is switched every 5 minutes, and the determination of the gas content is performed. The concentration results of CO2, H2O, COS and CO in the two box bodies are as shown in Table 1. Figure 10 The transpiration rate, photosynthetic rate and stomatal conductance calculated by combining the CO2 concentration difference, H2O concentration difference and leaf temperature are as shown in Table 2. Figure 11 The fluxes of COS and CO calculated by combining the COS concentration difference and CO concentration difference are as shown in Table 3. Figure 12

[0053] ​It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0054] The principles and implementation modes of the present application are described by applying specific examples in the present application. The above embodiment description is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application ranges. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A dynamic chamber detection system for measuring the exchange of gases between a plant and the atmosphere, characterized in that, The utility model relates to a kind of experimental box body, including blank control box (2) and the plant box (1) of containing plant (3), the plant box (1) is communicated with first air inlet pipe (4) and first air outlet pipe (5);The control box (2) is communicated with second air inlet pipe (6) and second air outlet pipe (7) in;Air pump (8) is communicated with the first air inlet pipe (4) and the second air inlet pipe (6);Gas analyzer (9) is communicated with the first air outlet pipe (5) and the second air outlet pipe (7). Flow controller (10) for adjusting gas flow and recording flow data is arranged on the first air inlet pipe (4) and the second air inlet pipe (6), overflow valve (11) is arranged between the air pump (8) and the flow controller (10), and the flow controller (10) is connected with a control device. First air suction pump (12) and second air suction pump (13) are respectively connected to the first air outlet pipe (5) and the second air outlet pipe (7), and the first air suction pump (12) and the second air suction pump (13) are communicated with the gas analyzer (9) through a switching valve (14). A first fan (15) is arranged on the top of the experimental box body, and the fan blades of the first fan (15) are located inside the experimental box body.

2. The detection system of claim 1, wherein, The side wall of the experimental box body is a transparent Teflon film bag (21) made of Teflon, a binding opening (22) is formed in the bottom of the Teflon film bag (21), the top of the Teflon film bag (21) is sealed, and the Teflon film bag (21) is fixed on a support frame.

3. The detection system of claim 1, wherein, The support frame includes an inner frame (23) for fixing the Teflon film bag (21) and an outer frame (24) sleeved outside the inner frame (23), and the outer frame (24) is detachably connected with the inner frame (23).

4. The detection system of claim 1, wherein, The top of the inner frame (23) includes a thickened disc piece (25) that is not easy to deform, the disc piece (25) includes a disc body (26) and a plurality of protruding ear plates (27) arranged around the outer periphery of the disc body (26), the protruding ear plates (27) are fixedly connected with a first vertical rod (28), the first vertical rod (28) is parallel to the axis of the disc piece (25), the top of the Teflon film bag (21) is detachably connected with the disc piece (25), and the outer frame (24) includes a plurality of second vertical rods (29) arranged vertically, and adjacent second vertical rods (29) are fixedly connected by a cross bar (30).

5. The detection system of claim 1, wherein, A lifting lug (31) is arranged on the top surface of the disc piece (25), and the lifting lug (31) is detachably connected with the top of the outer frame (24).

6. The detection system of claim 5, wherein, ​ 7. The detection system of claim 6, wherein, ​ 8. The detection system of claim 7, wherein, ​ 9. The detection system of claim 8, wherein, The bottom of the inner layer frame (23) is provided with an annular sheet (33), the top surface of the annular sheet (33) is fixedly connected with the bottom of the first vertical rod (28), the annular sheet (33) is coaxially arranged with the disc sheet (25), the middle part of the annular sheet (33) is provided with a central hole (34) for the binding port (22) to pass out, and the top surface of the annular sheet (33) is fixedly connected with the bottom of the first vertical rod (28).

10. The detection system of claim 9, wherein, The first air inlet pipe (4) is provided with a first circular ring segment (35) at the end of the plant box (1); the second air inlet pipe (6) is provided with a second circular ring segment (36) at the end of the control box (2); a plurality of air outlet holes are uniformly arranged on the first circular ring segment (35) and the second circular ring segment (36).

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