An indoor soil cultivation and soil respiration measurement system

Abstract

The present invention relates to the technical field of soil respiration measurement, and in particular to an indoor soil cultivation and soil respiration measurement system. The indoor soil cultivation and soil respiration measurement system includes: an air intake system, a first control valve, a CO2 filtering device, a soil cultivation system, a second control valve, a measurement analyzer, and a main control machine; the air intake system is connected to the soil cultivation system through the first control valve; the CO2 filtering device is connected to the first control valve; the soil cultivation system is connected to the measurement analyzer through the second control valve; the main control machine is respectively connected to the first control valve, the second control valve, and the measurement analyzer in a signal connection. The present invention can realize the real-time continuous automatic detection of CO2 released by the respiration of indoor soil microorganisms, and meet the current scientific research needs of indoor soil cultivation measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of soil respiration measurement, and particularly to an indoor soil cultivation and soil respiration measurement system. Background Art

[0002] Currently, in scientific research experiments such as ecology, grassland science, earth science, and soil science, soil sampling and analysis are carried out, especially the analysis of microorganisms in the soil, to measure the changes in soil microorganisms. Measuring soil microbial respiration is an important indicator for measuring changes in soil microorganisms, and it plays an important role in studying the decomposition and turnover of organic matter in the soil, the carbon cycle between the soil and the atmosphere, etc. Indoor soil cultivation can accurately control external conditions according to research needs, such as humidity, temperature, and light, as well as internal soil conditions such as soil moisture and nutrients, to cultivate soil microorganisms. Compared with direct measurement in the field environment, indoor soil cultivation measurement can increase the number of research samples, and the cultivation environment is controllable, enabling a more in-depth study of soil characteristics.

[0003] Currently, there are various methods for measuring soil respiration indoors. There is the relatively traditional method of collecting air in a culture bottle with a syringe and injecting it into a CO2 measuring instrument, and there are also some automatic measuring devices. However, the experimental conditions are not strictly controlled, resulting in large measurement errors and single-channel measurement. There are also related multi-channel automatic soil respiration measurement systems, but the control of external experimental conditions is not strict, causing certain errors.

[0004] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide an indoor soil cultivation and soil respiration measurement system that can achieve real-time and continuous automatic detection of CO2 released by soil microorganisms during indoor cultivation, meeting the current scientific research needs of indoor soil cultivation measurement.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides an indoor soil cultivation and soil respiration measurement system, which includes: an air intake system, a first control valve, a CO2 filtration device, a soil cultivation system, a second control valve, a measurement analyzer, and a main control machine;

[0008] The air intake system is connected to the soil cultivation system through the first control valve;

[0009] The CO2 filtration device is connected to the first control valve;

[0010] The soil cultivation system is connected to the measurement and analysis instrument through a second control valve;

[0011] The main control unit is respectively signal-connected to the first control valve, the second control valve and the measurement and analysis instrument.

[0012] As a further technical solution, the air intake system includes: an air intake pipeline, and a gas pump, a filter element assembly, a temperature and humidity control device, a flowmeter and a shunt arranged on the air intake pipeline in sequence;

[0013] The shunt is connected to a plurality of the first control valves;

[0014] The CO2 filtering device is respectively connected to each of the first control valves;

[0015] The temperature and humidity control device and the flowmeter are respectively signal-connected to the main control unit.

[0016] As a further technical solution, the soil cultivation system includes: a cultivation box and a plurality of cultivation bottles arranged in the cultivation box;

[0017] The cultivation bottles are respectively connected to the shunt through the first control valves;

[0018] The cultivation bottles are respectively connected to a gas collecting pipeline through the second control valves;

[0019] The gas collecting pipeline is connected to the measurement and analysis instrument;

[0020] The second control valve is also connected to an exhaust pipeline.

[0021] As a further technical solution, the air intake pipeline includes: a filter net, an outdoor pipeline and an indoor pipeline;

[0022] The filter net is arranged at the front end of the outdoor pipeline;

[0023] The filter net is in a flared shape;

[0024] The indoor pipeline is connected to the outdoor pipeline.

[0025] As a further technical solution, the temperature and humidity control device includes a box body, and a heating unit, a humidifying unit and a temperature and humidity measuring unit arranged in the box body; the temperature and humidity measuring unit is signal-connected to the main control unit.

[0026] As a further technical solution, the diverter is a device in the shape of a flared opening, and its flared opening is sealed by a sealing plate; a conical protrusion is arranged inside the sealing plate, and the tip of the conical protrusion faces the air inlet of the diverter; a plurality of steel pipes are penetrated through the sealing plate, and the steel pipes are respectively connected to shunt pipelines, and the shunt pipelines are respectively connected to the first control valve.

[0027] As a further technical solution, the first control valve is a four-way solenoid valve; the second control valve is a three-way solenoid valve.

[0028] As a further technical solution, the CO2 filtering device includes a CO2 filtering inlet pipeline, a soda lime tank, an air pump, a filter element structure and a CO2 filtering outlet pipeline; the CO2 filtering inlet pipeline is connected to the first control valve, and the soda lime tank, the air pump and the filter element structure are sequentially arranged between the CO2 filtering inlet pipeline and the CO2 filtering outlet pipeline, and the CO2 filtering outlet pipeline is connected to the first control valve.

[0029] As a further technical solution, the tail gas pipeline includes: a tail gas shunt gas path, an exhaust steel pipe, an exhaust hose, an exhaust pump and an exhaust pipe; the tail gas shunt gas path is connected to the exhaust steel pipe, the lower part of the exhaust steel pipe is open, the upper part is connected to one end of the exhaust hose, the other end of the exhaust hose is connected to the exhaust pump, and the exhaust pump operates to discharge the gas through the exhaust pipe.

[0030] As a further technical solution, the gas collecting pipeline includes: a gas collecting shunt gas path, a gas collecting steel pipe and a gas collecting conveying gas path. Among them, the gas collecting shunt gas path is connected to the gas collecting steel pipe for conveying the gas in the culture flask into the gas collecting steel pipe, and the gas collecting steel pipe is connected to the measurement analyzer through the gas collecting conveying gas path.

[0031] Adopting the above technical solutions, the present invention has the following beneficial effects:

[0032] 1. The flow rate control error of each air flow path is small, and the shunt method is simple;

[0033] 2. Exclude external influences to minimize the impact of the outside world on the research;

[0034] 3. Each path is measured separately and does not affect each other;

[0035] 4. It has good integration, and most operations can be completed on the main control machine;

[0036] 5. Automatically detect the CO2 released by soil microorganisms in real time and continuously. Description of the Drawings

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 Schematic diagram of the indoor soil cultivation and soil respiration measurement system according to an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the top air inlet pipe according to an embodiment of the present invention;

[0040] Figure 3 Schematic diagram of the side wall air inlet pipe according to an embodiment of the present invention;

[0041] Figure 4 Schematic diagram of the air inlet filter according to an embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the temperature and humidity control device according to an embodiment of the present invention;

[0043] Figure 6 Schematic diagram of the gas diverter according to an embodiment of the present invention;

[0044] Figure 7 Top view of the bottom of the diverter according to an embodiment of the present invention;

[0045] Figure 8 Internal gas flow diagram of the diverter according to an embodiment of the present invention;

[0046] Figure 9 Schematic diagram of the four-way solenoid valve according to an embodiment of the present invention;

[0047] Figure 10 Schematic diagram of the CO2 filter according to an embodiment of the present invention;

[0048] Figure 11 Schematic diagram of the tail gas pipeline according to an embodiment of the present invention;

[0049] Figure 12 Schematic diagram of the gas collecting pipeline according to an embodiment of the present invention.

[0050] Icon: 1 - intake pipeline; 2 - air pump; 3 - filter element assembly; 4 - temperature and humidity control device; 5 - flowmeter; 6 - diverter; 7 - four-way solenoid valve; 8 - CO2 filtration device; 9 - incubator; 10 - culture flask; 11 - three-way solenoid valve; 12 - tail gas pipeline; 13 - gas collecting pipeline; 14 - determination analyzer; 15 - main control unit; 1a - filter screen; 1b - outdoor pipeline; 1c - indoor pipeline; 1a1 - stainless steel bell-shaped air inlet; 1a2 - stainless steel mesh; 4a - heating unit; 4b - humidifying unit; 4c - temperature and humidity measurement unit; 6a - diverter air inlet; 6b - conical protrusion; 6c - sealing plate; 6d - steel pipe; 6e - diversion pipeline; 7a - gas inlet and outlet; 7b - gas inlet and outlet; 7c - gas inlet and outlet; 7d - gas inlet and outlet; 8a - CO2 filtration inlet pipeline; 8b - soda lime tank; 8c - air pump; 8d - filter element structure; 8e - CO2 filtration outlet pipeline; 12a - tail gas diversion air path; 12b - exhaust steel pipe; 12c - exhaust hose; 12d - exhaust pump; 12e - exhaust pipe; 13a - gas collecting diversion air path; 13b - gas collecting steel pipe; 13c - gas collecting and conveying air path; 16 - control cable. Detailed implementation manners

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] The following will detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present invention and are not used to limit the present invention.

[0053] Combined with Figures 1 to 12 As shown, this embodiment provides an indoor soil cultivation and soil respiration measurement system, which includes: an intake system, a first control valve, a CO2 filtration device 8, a soil cultivation system, a second control valve, a determination analyzer 14, and a main control unit 15; the intake system is connected to the soil cultivation system through the first control valve; the CO2 filtration device 8 is connected to the first control valve; the soil cultivation system is connected to the determination analyzer 14 through the second control valve; the main control unit 15 is respectively signal-connected to the first control valve, the second control valve, and the determination analyzer 14 (for example: connected through a control cable 16). This embodiment can realize real-time and continuous automatic detection of CO2 released by indoor soil microorganisms during respiration, meeting the current scientific research needs of indoor soil cultivation and measurement.

[0054] In this embodiment, as a further technical solution, the intake system includes: an intake duct 1, and an air pump 2, a filter element assembly 3, a temperature and humidity control device 4, a flowmeter 5, and a diverter 6 that are sequentially arranged on the intake duct 1; the diverter 6 is connected to a plurality of the first control valves; the CO2 filtering device 8 is respectively connected to each of the first control valves; the temperature and humidity control device 4 and the flowmeter 5 are respectively connected to the main control unit 15 in a signal connection.

[0055] In this embodiment, as a further technical solution, the soil cultivation system includes: a cultivation box 9 and a plurality of cultivation bottles 10 arranged in the cultivation box 9; the cultivation bottles 10 are respectively connected to the diverter 6 through the first control valves; the cultivation bottles 10 are respectively connected to a gas collecting pipeline 13 through the second control valves; the gas collecting pipeline 13 is connected to the measurement and analysis instrument 14; the second control valve is further connected to an exhaust gas pipeline 12. The cultivation box 9 is a constant temperature box body, and a plurality of cultivation bottles 10 are arranged in layers therein; the mouths of the cultivation bottles 10 are sealed, and the intake pipe and the exhaust pipe pass through the bottle cap.

[0056] Preferably, in each example of the present invention, the intake duct 1 includes: a filter net 1a, an outdoor duct 1b, and an indoor duct 1c; the filter net 1a is arranged at the front end of the outdoor duct 1b to filter impurities and flying insects floating in the air from entering the duct; the filter net 1a is in a flared shape; the indoor duct 1c is connected to the outdoor duct 1b.

[0057] More preferably, in each example of the present invention, the filter net 1a is a stainless steel net 1a2 with a mesh number of not less than 20 meshes fixed to a stainless steel flared air inlet 1a1. The outdoor duct 1b is made of a stainless steel pipe with polished inner and outer surfaces, and the air inlet is downward to prevent precipitation and particulate sediment from entering the duct; the outdoor duct 1b passes through the top or side wall of the building and enters the room, and is connected to the indoor duct 1c; the indoor duct 1c uses a polytetrafluoroethylene hose to facilitate the connection of the subsequent gas circuit. The gas introduced into the entire system is the air in the external atmospheric environment, rather than the indoor air, in order to ensure that the gas in contact with the soil cultivation is as the same as the natural air as much as possible.

[0058] Preferably, in each example of the present invention, the driving force for the air flow in the entire system mainly comes from an oil-free silent air pump 2, and the air pump 2 blows the external air into the cultivation system; the air flow rate in the entire system is small, and the power of the air pump 2 is not large. The filter element assembly 3 is used to filter 99.99% of the fine particles in the air to prevent the particulate matter in the atmosphere from entering the duct and the cultivation bottles 10 and affecting the experimental results.

[0059] In this embodiment, as a further technical solution, the temperature and humidity control device 4 includes a box body, and a heating unit 4a, a humidifying unit 4b, and a temperature and humidity measuring unit 4c arranged inside the box body; the temperature and humidity measuring unit 4c is signal-connected to the main control machine 15. The main purpose of controlling the temperature and humidity of the air is to keep the culture bottle 10 in a constant temperature and humidity state in the incubator 9, which is beneficial to soil cultivation. The temperature and humidity of the outside air are not the same as those of the incubator 9. When dry air enters the culture bottle 10, the humidity of the soil in the culture bottle 10 will decrease. When humid air enters the culture bottle 10, the soil moisture in the culture bottle 10 will increase. Both of these will inhibit or promote the growth of soil microorganisms and affect the experimental results. The temperature of the outside air is the same. If the air and the temperature in the incubator 9 are relatively low, the temperature of the soil in the culture bottle 10 will be reduced after the air enters the culture bottle 10, inhibiting the growth of microorganisms in the soil.

[0060] The temperature and humidity control device 4 is a complete box body, and the inside of the box body is divided into three units, each unit being independent. The heating unit 4a is made of a spiral heating copper tube. The purpose of using the spiral copper tube is to increase the length of the air flowing through the heating copper tube to achieve the purpose of full heating. The temperature of the air rises to the required temperature after flowing through the heating tube; the humidifying unit 4b is that the humidifying device c increases the air humidity in the space to the set value. After the air flows through this space, the humidity can reach a certain value. The air enters from port a and exits from port b; the temperature and humidity measuring unit is that the temperature and humidity probe d is installed in the air path coming out of port b to measure the temperature and humidity of the air in real time and transmit the numerical value to the main control machine 15. The main control machine 15 adjusts the working states of the heating unit 4a and the humidifying unit 4b according to the set temperature and humidity values.

[0061] In this embodiment, as a further technical solution, the shunt device 6 is a device in the shape of a flared mouth, and its flared mouth is sealed by a sealing plate 6c; a conical protrusion 6b is arranged inside the sealing plate 6c, and the tip of the conical protrusion 6b faces the air inlet 6a of the shunt device; a plurality of steel pipes 6d are penetrated through the sealing plate 6c, and the steel pipes 6d are respectively connected to shunt pipelines 6e, and the shunt pipelines 6e are respectively connected to the first control valve. Air enters the shunt device from the air inlet 6a and is shunted in all directions at the conical protrusion 6b. As Figure 8 shown, it flows to the shunt steel pipes 6d of the sealing plate 6c. The shunt device 6 can make the gas flow velocity in each shunted air path approximately the same, which is simple and practical, and there is no need to add a flow meter to control the flow velocity on each path.

[0062] In this embodiment, as a further technical solution, the first control valve is a four-way solenoid valve 7; the second control valve is a three-way solenoid valve 11.

[0063] In each example of the present invention, as Figure 1As shown, after the air is split from the splitter 6, it enters the four-way solenoid valve 7 on each gas path. As Figure 9 shown, the four-way solenoid valve 7 has four gas inlets and outlets 7a, 7b, 7c, and 7d; under normal conditions, the gas inlet and outlet 7a communicates with the gas inlet and outlet 7b, and the gas inlet and outlet 7c and the gas inlet and outlet 7d are sealed. After the four-way solenoid valve 7 is energized, the gas inlet and outlet 7a communicates with the gas inlet and outlet 7c, and the gas inlet and outlet 7d communicates with the gas inlet and outlet 7b. During the normal soil cultivation process, the solenoid valve is in the closed state, and the air flows from the gas inlet and outlet 7a to the gas inlet and outlet 7b, and then directly flows to the soil cultivation box 9. If it is necessary to measure the CO2 content generated by soil respiration in the culture bottle 10, open the solenoid valve of the gas path corresponding to the culture bottle 10 to be measured. The air flows from the gas inlet and outlet 7a to the gas inlet and outlet 7c, flows from the gas inlet and outlet 7c to the CO2 filtering device 8, the air is filtered, and then flows back to the solenoid valve from the gas inlet and outlet 7d, flows out from the gas inlet and outlet 7b, and then flows into the culture bottle 10 to be measured.

[0064] In this embodiment, as a further technical solution, the CO2 filtering device 8 includes a CO2 filtering inlet gas pipeline 8a, a soda lime tank 8b, an air pump 8c, a filter element structure 8d, and a CO2 filtering outlet gas pipeline 8e; the CO2 filtering inlet gas pipeline 8a is connected to the first control valve, and the soda lime tank 8b, the air pump 8c, and the filter element structure 8d are sequentially arranged between the CO2 filtering inlet gas pipeline 8a and the CO2 filtering outlet gas pipeline 8e, and the CO2 filtering outlet gas pipeline 8e is connected to the first control valve. The air enters from the CO2 filtering inlet gas pipeline 8a, the CO2 in the air is filtered out by the soda lime tank, and the impurities carried out by the soda lime are filtered by the super filter element, and then flows out from the CO2 filtering outlet gas pipeline 8e; there is a small air pump 8c in the middle of the gas path of the soda lime tank and the super filter element, and its main function is to assist the air flow. When the air passes through the soda lime tank and the super filter element in the CO2 filtering device 8, the air flow will be subject to a large resistance, while the air flow resistance of other shunt paths is small, which will cause the air flow of this path filtered by CO2 to be very small. Therefore, an auxiliary air pump 8c is added in the CO2 filtering device 8 to assist the air flow for the purpose of the natural environment. Under the normal cultivation state, the air introduced into the whole system is the air in the atmosphere. When it is necessary to measure the soil respiration state in a certain culture bottle, let the air in the gas path of this culture pass through the CO2 filtering device 8, filter out the CO2 first, and then measure the CO2 generated by the soil respiration.

[0065] In this embodiment, as a further technical solution, the tail gas pipeline 12 includes: a tail gas shunt gas path 12a, an exhaust steel pipe 12b, an exhaust hose 12c, an exhaust pump 12d, and an exhaust pipe 12e; the tail gas shunt gas path 12a is connected to the exhaust steel pipe 12b. The lower part of the exhaust steel pipe 12b is open. The purpose of the open lower part is that when the exhaust pump is operating, air can enter from the open port without increasing the negative pressure of the tail gas path coming out of the culture flask, enabling the gas in the culture flask to be freely discharged. The upper part is connected to one end of the exhaust hose 12c, and the other end of the exhaust hose 12c is connected to the exhaust pump 12d. When the exhaust pump 12d operates, air enters from the lower part of the exhaust steel pipe 12b and is discharged through the exhaust pipe 12e together with the tail gas coming out of the tail gas shunt gas path 12a.

[0066] In this embodiment, as a further technical solution, the gas collecting pipeline 13 includes: a gas collecting shunt gas path 13a, a gas collecting steel pipe 13b, and a gas collecting and conveying gas path 13c. Among them, the gas collecting shunt gas path 13a is connected to the gas collecting steel pipe 13b and is used to convey the gas in a certain culture flask 10 to the gas collecting steel pipe 13b. The gas collecting steel pipe 13b is connected to the measuring and analyzing instrument 14 through the gas collecting and conveying gas path 13c. The measuring and analyzing instrument 14 measures the CO2 content in the gas flowing out of a certain culture flask 10, so as to study the soil respiration status.

[0067] In each example of the present invention, as Figure 1 shown, the temperature and humidity control device 4, the flowmeter 5, the four-way solenoid valve 7, the three-way solenoid valve 11, and the measuring and analyzing instrument 14 are all connected to the main control machine 15 through control cables. The main control machine 15 controls the operation of the entire system and simultaneously stores and records data for later research and analysis. In each example of the present invention, as Figure 1 shown, in the entire system, except for the tail gas pipeline 12, the rest of the intake and shunt pipelines are all made of stainless steel pipes and polytetrafluoroethylene pipes, ensuring the stable airflow of the entire system. The chemical properties of polytetrafluoroethylene pipes and stainless steel pipes are relatively stable, not easily aging, and will not generate other gases that affect the entire system and experimental results.

[0068] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indoor soil cultivation and soil respiration measurement system, characterized in that, Including: An intake system, a first control valve, a CO2 filtering device, a soil cultivation system, a second control valve, a measurement and analysis instrument, and a main control unit; The intake system is connected to the soil cultivation system through the first control valve; The gas introduced into the intake system is the air in the external atmospheric environment; A plurality of the first control valves are provided; The soil cultivation system includes a cultivation chamber and a plurality of cultivation bottles arranged in the cultivation chamber; The plurality of cultivation bottles are respectively connected to the intake system through the plurality of first control valves; The CO2 filtering device is respectively connected to each of the first control valves; both the CO2 filtering inlet pipeline and the CO2 filtering outlet pipeline of the CO2 filtering device are connected to the first control valve; The first control valve is a four-way solenoid valve; the four-way solenoid valve has four gas inlets and outlets. During the normal soil cultivation process, the four-way solenoid valve is in a closed state, and the air directly flows to the soil cultivation chamber after passing through the four-way solenoid valve; if it is necessary to measure the CO2 content generated by soil respiration in the cultivation bottle, open the four-way solenoid valve corresponding to the gas path of the cultivation bottle to be measured. The air flows from one gas inlet and outlet of the four-way solenoid valve to the CO2 filtering device. After being filtered, the air flows back to the solenoid valve from another gas inlet and outlet of the four-way solenoid valve and then flows to the cultivation bottle to be measured; The soil cultivation system is connected to the measurement and analysis instrument through the second control valve; The cultivation bottles are respectively connected to a gas collecting pipeline through the second control valve; The gas collecting pipeline is connected to the measurement and analysis instrument; The second control valve is also connected to an exhaust pipeline; The main control unit is respectively connected to the first control valve, the second control valve, and the measurement and analysis instrument in a signal manner.

2. The indoor soil cultivation and soil respiration measurement system according to claim 1, characterized in that, The intake system includes: an intake pipeline and a gas pump, a filter element assembly, a temperature and humidity control device, a flowmeter, and a shunt arranged in sequence on the intake pipeline; The shunt is connected to a plurality of the first control valves; the temperature and humidity control device and the flowmeter are respectively connected to the main control unit in a signal manner.

3. The indoor soil cultivation and soil respiration measurement system according to claim 2, characterized in that, The cultivation bottles are respectively connected to the shunt through the first control valve.

4. The indoor soil cultivation and soil respiration measurement system according to claim 2, characterized in that, The intake pipeline includes: a filter screen, an outdoor pipeline, and an indoor pipeline; The filter screen is arranged at the front end of the outdoor pipeline; The filter screen is in a flared shape; The indoor pipeline is connected to the outdoor pipeline.

5. The indoor soil cultivation and soil respiration measurement system according to claim 2, characterized in that, The temperature and humidity control device includes a box body and a heating unit, a humidifying unit, and a temperature and humidity measurement unit arranged in the box body; the temperature and humidity measurement unit is connected to the main control unit in a signal manner.

6. The indoor soil cultivation and soil respiration measurement system according to claim 2, characterized in that, The shunt is a device in a flared shape, and its flare is sealed by a sealing plate; a conical protrusion is arranged inside the sealing plate, and the tip of the conical protrusion faces the air inlet of the shunt; a plurality of steel pipes are penetrated through the sealing plate, and the steel pipes are respectively connected to shunt pipelines, and the shunt pipelines are respectively connected to the first control valves.

7. The indoor soil cultivation and soil respiration measurement system according to claim 1, characterized in that, The second control valve is a three-way solenoid valve.

8. The indoor soil cultivation and soil respiration measurement system according to claim 1, characterized in that, The CO2 filtering device includes the CO2 filtering intake pipeline, the soda lime tank, the air pump, the filter element structure, and the CO2 filtering outlet pipeline; the soda lime tank, the air pump, and the filter element structure are sequentially arranged between the CO2 filtering intake pipeline and the CO2 filtering outlet pipeline.

9. The indoor soil cultivation and soil respiration measurement system according to claim 3, characterized in that, The tail gas pipeline includes: a tail gas shunt gas path, an exhaust steel pipe, an exhaust hose, an exhaust pump, and an exhaust pipe; the tail gas shunt gas path is connected to the exhaust steel pipe, the lower part of the exhaust steel pipe is open, the upper part is connected to one end of the exhaust hose, the other end of the exhaust hose is connected to the exhaust pump, and the exhaust pump operates to discharge the gas through the exhaust pipe.

10. The indoor soil cultivation and soil respiration measurement system according to claim 3, characterized in that,The gas collecting pipeline includes: a gas collecting shunt gas path, a gas collecting steel pipe, and a gas collecting and conveying gas path. Among them, the gas collecting shunt gas path is connected to the gas collecting steel pipe for conveying the gas in the culture bottle to the gas collecting steel pipe, and the gas collecting steel pipe is connected to the measurement and analysis instrument through the gas collecting and conveying gas path.

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