A soil respiration detection device

Abstract

The utility model discloses a kind of soil respiration detection devices, belong to soil detection technical field, including measuring chamber, the top of measuring chamber is connected with infrared gas analyzer by gas path, the bottom of measuring chamber is provided with base, the bottom of base is provided with several tines, inflatable sealing ring is provided on the inner side wall of base;The top of measuring chamber is provided with several through holes, the outer side cover of through hole is provided with pressure balance membrane;Temperature sensor two is provided on the inner side wall of measuring chamber upper position, support frame is provided on the inner side wall bottom position of measuring chamber, temperature sensor one is provided on the bottom position of support frame;Fan mechanism is provided inside measuring chamber.The utility model soil respiration detection device solves the problem of air leakage and big fluctuation of air pressure in box, improves detection precision and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, and in particular to a soil respiration testing device. Background Technology

[0002] Soil respiration is a core component of the carbon cycle in soil ecosystems and a primary pathway for carbon to return from terrestrial ecosystems to the atmosphere. Globally, soils store approximately 1.5 trillion tons of carbon, accounting for about 30% of the Earth's total carbon storage. Even small changes in soil respiration rates can affect atmospheric carbon dioxide concentrations. Therefore, accurately measuring soil respiration release is crucial for assessing biological processes in ecosystems, understanding the impacts of climate change on soil life activities, and developing effective soil carbon management strategies to mitigate global climate change. Current methods for monitoring soil respiration rates primarily rely on the static chamber method. However, traditional static chamber methods suffer from large pressure fluctuations and leakage, making it difficult to meet the high precision, real-time nature, and continuity requirements of modern scientific research for soil respiration data. Based on this, this invention proposes a soil respiration detection device. Utility Model Content

[0003] The purpose of this invention is to provide a soil respiration detection device to solve the problems mentioned above.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model discloses a soil respiration detection device, comprising a measuring chamber, an infrared gas analyzer connected to the top of the measuring chamber via an air passage, a base at the bottom of the measuring chamber with several pointed teeth on the bottom, and an inflatable sealing ring on the inner wall of the base; several through holes are opened at the top of the measuring chamber, and a pressure balancing membrane is covered on the outer side of the through holes; a second temperature sensor is installed at the upper position of the inner wall of the measuring chamber, a support frame is installed at the bottom position of the inner wall of the measuring chamber, and a first temperature sensor is installed at the bottom position of the support frame; a fan mechanism is installed inside the measuring chamber.

[0006] Furthermore, the inflatable sealing ring is connected to an external air source through an inflation port.

[0007] Furthermore, the temperature sensor is located at the upper part of the bottom of the support frame and is used to measure the temperature of the soil surface.

[0008] Furthermore, handles are symmetrically arranged on the top of the measuring chamber.

[0009] Furthermore, the fan mechanism includes a support plate circumferentially distributed on the inner side wall of the measuring chamber, and a rotating shaft is rotatably disposed at the center of the support plate; one end of the rotating shaft is provided with a fan structure composed of several fan blades, and the other end is connected to a synchronous pulley one; the synchronous pulley one is connected to a synchronous pulley two through a synchronous belt; the synchronous pulley two is connected to a motor; and the motor is mounted on the measuring chamber through a motor mounting bracket.

[0010] Furthermore, the motor is a geared motor.

[0011] Furthermore, the temperature sensor one, temperature sensor two, and motor are connected to the control module, and the control module is connected to the display screen.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] This novel soil respiration detection device avoids the problem of incomplete sealing between the bottom of the measuring chamber and the soil by using an inflatable sealing ring, thus preventing air leakage during the measurement process. Furthermore, a pressure balancing membrane is used to balance the air pressure inside and outside the measuring chamber, preventing negative or positive pressure caused by air extraction or temperature changes, thereby avoiding the "pump effect" (the inhalation or exhalation of gas due to non-respiration processes). In summary, this novel soil respiration detection device solves the problems of air leakage and large pressure fluctuations within the chamber, improving detection accuracy and efficiency. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a cross-sectional view of the soil respiration detection device of this utility model;

[0016] Figure 2 This is a partial schematic diagram of the soil respiration detection device of this utility model;

[0017] Figure 3 This is a schematic diagram of the fan mechanism.

[0018] Explanation of reference numerals in the attached diagram: 1. Measuring chamber; 2. Base; 3. Through hole; 4. Pressure balancing diaphragm; 5. Teeth; 6. Temperature sensor one; 7. Support frame; 8. Rotating shaft; 9. Support plate; 10. Temperature sensor two; 11. Fan blade; 12. Inflatable sealing ring; 13. Inflatable port; 14. Air passage; 15. Handle; 16. Synchronous pulley one; 17. Synchronous belt; 18. Synchronous pulley two; 19. Motor; 20. Motor mounting base. Detailed Implementation

[0019] like Figure 1-3As shown, a soil respiration detection device includes a measuring chamber 1. The top of the measuring chamber 1 is connected to an infrared gas analyzer (such as the LI-COR soil respiration system) via a gas passage 14. The infrared gas analyzer, based on the absorption characteristics of CO2 molecules for infrared light of a specific wavelength (approximately 4.26 μm), accurately measures the concentration of CO2 (and H2O) flowing through the gas passage at a high frequency (e.g., once per second). The higher the concentration, the more infrared light is absorbed. The gas concentration can be calculated by measuring the absorption amount. This is an existing technology and will not be elaborated further here. Handles 15 are symmetrically installed on the top of the measuring chamber 1 for easy carrying.

[0020] A base 2 is installed at the bottom of the measuring chamber 1. Several sharp teeth 5 are installed at the bottom of the base 2. The sharp teeth 5 are used to insert into the soil and form and fix the equipment. An inflatable sealing ring 12 is installed on the inner side wall of the base 2. The inflatable sealing ring 12 is connected to an external air source through an air inlet 13 to ensure a tight fit with the soil and prevent gas leakage.

[0021] The top of the measuring chamber 1 has several through holes 3, and the outside of the through holes 3 is covered with a pressure balancing membrane 4 to balance the air pressure inside and outside the measuring chamber 1, prevent negative or positive pressure caused by air extraction or temperature changes, and thus avoid the "pump effect" (gas inhalation or exhalation caused by non-breathing).

[0022] Temperature sensor 10 is installed on the upper part of the inner wall of the measuring chamber 1, and a support frame 7 is installed on the bottom part of the inner wall of the measuring chamber 1. Temperature sensor 6 is installed at the bottom of the support frame 7. Temperature sensor 6 is located on the upper part of the bottom of the support frame 7 and is used to measure the temperature of the soil surface. Temperature sensor 6 and temperature sensor 10 monitor the temperature of the soil surface or the air in the chamber in real time, because temperature is a key factor affecting the respiration rate.

[0023] A fan mechanism is installed inside the measuring chamber 1. The fan mechanism includes support plates 9 circumferentially distributed on the inner wall of the measuring chamber 1, with a rotating shaft 8 rotatably mounted at the center of the support plates 9. One end of the rotating shaft 8 is equipped with a fan structure consisting of several fan blades 11, and the other end is connected to a first synchronous pulley 16. The first synchronous pulley 16 is connected to a second synchronous pulley 18 via a synchronous belt 17. The second synchronous pulley 18 is connected to a motor 19, which is mounted on the measuring chamber 1 via a motor mounting bracket 20. The motor 19 is a geared motor. When the motor 19 is started, the second synchronous pulley 18 drives the synchronous belt 17 to move, causing the first synchronous pulley 16 to rotate, which in turn causes the rotating shaft 8 to rotate. This rotation of the fan blades 11 mixes the air in the chamber during measurement, ensuring uniform CO2 concentration and making the measurement results more accurate.

[0024] The temperature sensor 6, temperature sensor 10, and motor 19 are connected to a control module (such as an ARM Cortex-M series microprocessor), which is connected to a display screen (such as an LCD screen) for real-time display of measurement status, concentration change curves, calculation results, and environmental parameters. A rechargeable DC battery pack is also included to power the temperature sensor 6, temperature sensor 10, and motor 19.

[0025] The working process of this utility model is as follows:

[0026] First, insert the pointed teeth 5 on the base 2 into the soil, and inflate the sealing ring 12 to seal the gap between the base 2 and the soil; then, connect the air passage 14 at the top to the infrared gas analyzer; finally, start the motor 19, and the fan blades 11 begin to rotate, and the recorder records and observes the data on the display screen.

[0027] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A soil respiration detection device, characterized by: The device includes a measuring chamber (1), the top of which is connected to an infrared gas analyzer via a gas path (14). A base (2) is provided at the bottom of the measuring chamber (1), and several sharp teeth (5) are provided at the bottom of the base (2). An inflatable sealing ring (12) is provided on the inner side wall of the base (2). Several through holes (3) are provided at the top of the measuring chamber (1), and a pressure balancing membrane (4) is provided on the outer side of the through holes (3). A second temperature sensor (10) is provided on the upper part of the inner side wall of the measuring chamber (1), and a support frame (7) is provided on the bottom part of the inner side wall of the measuring chamber (1). A first temperature sensor (6) is provided on the bottom part of the support frame (7). A fan mechanism is provided inside the measuring chamber (1).

2. The soil respiration detection apparatus of claim 1, wherein: The inflatable sealing ring (12) is connected to an external air source through an air inlet (13).

3. The soil respiration detection apparatus of claim 1, wherein: The temperature sensor (6) is located at the upper part of the bottom of the support frame (7) and is used to measure the temperature of the soil surface.

4. The soil respiration detection apparatus of claim 1, wherein: The top of the measuring chamber (1) is symmetrically provided with handles (15).

5. The soil respiration detection apparatus of claim 1, wherein: The fan mechanism includes a support plate (9) circumferentially distributed on the inner wall of the measuring chamber (1), and a rotating shaft (8) is rotatably provided at the center of the support plate (9); one end of the rotating shaft (8) is provided with a fan structure composed of several fan blades (11), and the other end is connected to a synchronous pulley (16). The synchronous pulley (16) is connected to a synchronous pulley (18) via a synchronous belt (17). The synchronous pulley (18) is connected to a motor (19), and the motor (19) is mounted on the measuring chamber (1) via a motor mounting base (20).

6. The soil respiration detection apparatus of claim 5, wherein: The motor (19) is a geared motor.

7. The soil respiration detection apparatus of claim 5, wherein: The temperature sensor 1 (6), temperature sensor 2 (10), and motor (19) are connected to the control module, which is connected to the display screen.

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