A device for in-situ monitoring of temperature and moisture changes in soil profiles

Abstract

This invention discloses a device for in-situ monitoring of temperature and moisture changes in a soil profile, belonging to the field of soil testing technology. It includes a base body, a temperature sensing component, and a moisture detection component. The base body includes a first substrate parallel to the soil profile. The temperature sensing component includes multiple temperature sensing needles and insertion holes on the first substrate. The insertion holes are arranged in a "T" shape, with the lower insertion holes arranged vertically. The temperature sensing needles are inserted into the soil through the insertion holes to measure the temperature at different depths. The moisture detection component includes moisture probes for measuring soil moisture content. At least two moisture probes are located on one side of the first substrate, arranged vertically at intervals. This invention enables precise positioning and matching of the temperature sensing needles and the moisture probes using the insertion holes and connecting ropes.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, and in particular to a device for in-situ monitoring of temperature and moisture changes in soil profiles. Background Technology

[0002] Soil evaporation is a crucial process for maintaining surface energy and water balance, and its accurate calculation is essential for assessing farmland drought levels, crop water stress, and water resource management. Based on the principle of sensible heat balance, the soil evaporation rate can be estimated by the difference in sensible heat flux density between the upper and lower boundaries of the soil layer and the change in sensible heat storage within the soil layer. Specifically, the latent heat flux density of water within the soil layer can be calculated from the difference in sensible heat flux and the change in sensible heat storage, and then converted into the soil evaporation rate using the latent heat of vaporization of water.

[0003] Sensors for measuring in-situ soil evaporation typically consist of multiple temperature probes and moisture probes. The positions and distances between the temperature probes and moisture probes require manual measurement and confirmation, which is complex, prone to errors, and can easily interfere with the detection results of soil evaporation rates. Utility Model Content

[0004] In view of this, it is necessary to provide a device for in-situ monitoring of temperature and moisture changes in soil profiles to solve the problems of complex manual operation and large errors in existing detection processes.

[0005] This invention provides an in-situ monitoring device for changes in temperature and moisture in a soil profile, used to calculate the soil evaporation rate, comprising:

[0006] The base body includes a first base disposed parallel to the soil profile;

[0007] A temperature sensing component includes multiple temperature sensing needles and pin holes disposed on the first substrate. The multiple pin holes are arranged in a "T" shape. The multiple pin holes located at the bottom are arranged vertically relative to each other. The multiple temperature sensing needles are respectively inserted into the soil through the pin holes to measure the temperature of the soil at different depths.

[0008] A moisture detection assembly, comprising a moisture probe for measuring soil moisture content, wherein at least two moisture probes are disposed on one side of the first substrate and are arranged vertically at intervals between them.

[0009] Furthermore, the spacing between the plurality of pin holes located at the bottom is gradually increased from top to bottom.

[0010] Furthermore, the plurality of pin holes located at the top are horizontally spaced apart, and the horizontal spacing between the pin holes is consistent; the vertical spacing between the plurality of pin holes is gradually increased from top to bottom.

[0011] Furthermore, the temperature sensing needle includes an outer jacket and an E-type thermocouple, wherein the E-type thermocouple is disposed therein, and a high thermal conductivity material is filled between the E-type thermocouple and the outer jacket.

[0012] Furthermore, the moisture probe includes a stainless steel electrode and a time-domain reflectometer, the time-domain reflectometer being electrically connected to the stainless steel electrode.

[0013] Furthermore, the base body also includes a second base, which is horizontally arranged and integrally connected to the top of the first base. The second base can abut against the soil plane and support the entire base body.

[0014] Furthermore, the first substrate has a plurality of first snap-fit ​​pieces for snapping the temperature sensing needle and a second snap-fit ​​piece for snapping the moisture probe on the side away from the soil profile.

[0015] Furthermore, the moisture detection component also includes a positioning unit, which includes a connecting part, a positioning ring, and a connecting rope disposed on one side of the first base. One end of the connecting rope is connected to the connecting part, and the other end of the connecting rope is connected to the positioning ring. The connecting rope is relatively stretched and horizontally positioned, and the moisture probe is inserted into the positioning ring.

[0016] Furthermore, a marking groove is provided on the first base relative to the connecting rope. The marking groove is horizontally positioned and can help the connecting rope remain horizontal.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) This utility model discloses an in-situ monitoring device for temperature and moisture changes in a soil profile. The device includes a base body comprising a first substrate, which is parallel to the soil profile and can always be in contact with it, providing a basic operating foundation for the temperature sensing needles and moisture probes. The temperature sensing component includes multiple temperature sensing needles and insertion holes. The insertion holes are located on the first substrate and are arranged in a "T" shape. The lower insertion holes are arranged vertically relative to different soil depths. The multiple temperature sensing needles are inserted into the soil through the insertion holes to detect the temperature at different depths. The insertion holes limit the insertion position of the temperature sensing needles, control the distance between them, eliminate the negative impact of manual measurement, simplify the operation process, and improve detection accuracy.

[0019] (2) The present invention provides an in-situ monitoring device for temperature and moisture changes in soil profile, which is equipped with a moisture detection component. The moisture detection component includes a moisture probe for measuring soil moisture content. At least two moisture probes are set on one side of the first substrate and are arranged vertically at intervals. The moisture probes can detect moisture at a specific soil depth. By comprehensively processing the changes in temperature and moisture data at different depths, the evaporation of the corresponding soil area can be calculated. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ;

[0024] Figure 4 This is a schematic diagram of the overall structure of the present invention. Figure 4 ;

[0025] Figure 5 yes Figure 1 A magnified structural diagram of point A;

[0026] Figure 6 This is a schematic diagram of the connecting rope in this utility model.

[0027] Figure 7 This is a diagram illustrating the calculation model for heat balance in soil.

[0028] In the figure, 100 is the base body; 110 is the first base; 111 is the first snap-fit ​​component; 112 is the second snap-fit ​​component; 113 is the marking groove; and 120 is the second base.

[0029] 200. Temperature sensing component; 210. Pin hole;

[0030] 300. Moisture detection component; 310. Positioning unit; 311. Connecting part; 312. Positioning ring; 313. Connecting rope. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0032] Please see Figures 1 to 6 This embodiment describes an in-situ monitoring device for temperature and moisture changes in a soil profile, which relates to the field of soil testing technology. The device uses a base body 100 and a positioning unit 310 to accurately position and match the temperature sensing needles and the moisture probes using the needle holes 210 and connecting ropes 313. By integrating temperature and moisture detection into one device, the convenience and accuracy of the detection can be improved.

[0033] This embodiment discloses an in-situ monitoring device for temperature and moisture changes in a soil profile, comprising: a base body 100, a temperature sensing component 200, and a moisture detection component 300. The base body 100 is adaptable to the soil profile, providing a mounting foundation for the temperature sensing needle and the moisture probe. The temperature sensing component 200 can measure the temperature at different depths of the soil according to relevant requirements. The moisture detection component 300 can detect the moisture at a specific depth of the soil according to relevant requirements.

[0034] The base body 100 includes a first base 110, which is relatively parallel to the soil profile and can always conform to the profile, providing a basic operating foundation for the temperature sensing needles and moisture probes. The temperature sensing component 200 includes multiple temperature sensing needles and insertion holes 210. The multiple insertion holes 210 are disposed on the first base 110 and are arranged in a "T" shape. The lower insertion holes 210 are arranged relatively vertically, corresponding to different soil depths. The multiple temperature sensing needles are inserted into the soil through the insertion holes 210, thereby detecting the soil temperature at different depths. The insertion holes 210 can limit the insertion position of the temperature sensing needles, control the distance between the temperature sensing needles, eliminate the negative impact of manual measurement operations, simplify the operation process, and improve detection accuracy.

[0035] The moisture detection component 300 includes a moisture probe for measuring soil moisture content. At least two moisture probes are disposed on one side of the first substrate 110 and are arranged vertically at intervals. The moisture probes can detect moisture at a specific soil depth. By comprehensively processing the changes in temperature and moisture data at different depths, the evaporation of the corresponding soil area can be calculated.

[0036] In practical implementation, the temperature sensing needle includes an outer jacket and an E-type thermocouple. The E-type thermocouple is positioned in the middle, and a high thermal conductivity material fills the space between the E-type thermocouple and the outer jacket. The outer jacket can be made of stainless steel, titanium alloy, or aluminum alloy. It has good thermal conductivity, strong corrosion resistance, and can adapt to different soil conditions. The E-type thermocouple has excellent high sensitivity, possessing a high thermoelectric potential (Seebeck coefficient), with a sensitivity 2-3 times that of common thermocouples (such as K-type or J-type). High sensitivity means it can generate a strong electrical signal with relatively small temperature changes, providing more accurate temperature measurements. Simultaneously, the E-type thermocouple has good thermoelectric potential stability, providing accurate measurement results over a long period in stable temperature environments and is less susceptible to electrical noise interference. The high thermal conductivity material fills the gap between the E-type thermocouple and the outer jacket, improving the transfer efficiency between them. The high thermal conductivity material can be graphite or graphene.

[0037] Specifically, the temperature sensing needle is inserted into the soil through the insertion hole 210, and the outer jacket is in direct contact with the soil. The high thermal conductivity material can act as an intermediary to realize heat exchange between the outer jacket and the E-type thermocouple, so that the two maintain the same temperature. The E-type thermocouple accurately measures the temperature of the soil at the corresponding depth.

[0038] The moisture probe comprises stainless steel electrodes and a time-domain reflectometer (TDR). The TDR is electrically connected to the stainless steel electrodes. The TDR estimates soil moisture content by emitting electromagnetic waves and measuring their propagation time in the soil. Moisture content directly affects the dielectric constant of the soil, and the TDR can accurately calculate the soil moisture content based on changes in the propagation speed of electromagnetic waves. The stainless steel electrodes, as part of the sensor, provide excellent electrical contact and stability, ensuring accurate transmission of electromagnetic wave signals in the soil. The electrical connection between the electrodes and the TDR forms an effective signal transmission path, providing fast, stable, and highly accurate moisture measurement results.

[0039] In some embodiments, please refer to Figure 2 The spacing between the multiple insertion holes 210 located at the bottom gradually increases from top to bottom; simply put, the density of the insertion holes 210 gradually decreases from top to bottom. Each insertion hole 210 is equipped with a temperature sensing needle. The temperature sensing needles are more numerous and denser in the upper part near the surface soil, which can obtain more accurate temperature data at different depths, making the measurement structure more precise.

[0040] In principle, the closer the soil is to the surface, the greater the influence of external temperature. As the soil depth increases, the efficiency of heat transfer gradually decreases. The soil temperature at the surface changes drastically, while the soil temperature at the bottom layer is relatively stable.

[0041] The density of the temperature sensing needles, in conjunction with the degree of temperature change, allows for more precise measurement of soil temperature at a specific depth, thereby estimating the soil temperature at each depth and providing a data basis for subsequent calculations of soil evaporation.

[0042] In the specific implementation process, there are seven vertically arranged pin holes 210. The distance between each pin hole 210 and the top of the first base 110 from top to bottom is 10mm, 18mm, 25mm, 40mm, 60mm, 85mm and 110mm. The spacing between two adjacent pin holes 210 from top to bottom is 8mm, 7mm, 15mm, 20mm, 25mm and 25mm.

[0043] In some embodiments, please refer to Figure 2 Multiple pin holes 210 located at the upper part are horizontally spaced, with consistent horizontal spacing between them. Multiple temperature sensing pins that cooperate with the pin holes 210 can measure temperature changes at multiple locations at the same depth near the Earth's surface, thereby correcting measurement errors caused by minute scale differences and significantly improving the reliability and accuracy of temperature measurement. Simultaneously, the horizontal spacing of the multiple pin holes 210 at the upper part also allows them to be staggered, preventing interference between different temperature sensing pins.

[0044] In the specific implementation process, the upper "T"-shaped array is provided with three pin holes 210. The three pin holes 210 are horizontally spaced apart, and the distance between two adjacent pin holes 210 is 20mm. The distances between the three pin holes 210 and the top of the first base 110 are 12mm, 10mm and 14mm, respectively, and the vertical spacing between each pair of the three is 2mm.

[0045] Because the temperature near the ground varies greatly, the temperature sensing needles near the ground should be arranged more densely. However, the temperature sensing needles can interfere with each other. The purpose can be achieved by horizontally separating the three pin holes 210 with a distance of 2mm between them.

[0046] Compared with existing technologies, current measurement equipment and methods generally only set one or a few temperature sensing needles densely in the uppermost layer. Because the surface soil structure is greatly disturbed and is greatly affected by the external temperature, the temperature sensing needles are too close together and interfere with each other, causing the measurement results to deviate significantly from the true value and interfering with the final evaporation measurement results.

[0047] In some embodiments, please refer to Figures 1 to 4The base body 100 also includes a second base 120, which is horizontally positioned and integrally connected to the top of the first base 110. The second base 120 is in direct contact with the soil surface, providing a solid support foundation and making the entire base body 100 more stable on the soil surface. The horizontal positioning effectively prevents tilting or instability, ensuring stable operation of the equipment in the soil, especially in irregular or loose soil environments. The contact between the second base 120 and the soil surface enhances the supporting force of the base body 100. Especially under the influence of wind, vibration, or other external forces, it effectively reduces the possibility of equipment tilting, sinking, or displacement, ensuring long-term stable operation of the equipment.

[0048] In the specific implementation process, both the first substrate 110 and the second substrate 120 are made of transparent acrylic sheets, allowing sunlight to directly illuminate the soil surface through the acrylic sheets, thus preventing the second substrate 120 from blocking the soil surface. Furthermore, the first substrate 110 and the second substrate 120 are integrally formed, and their connection point has high bonding strength, preventing them from bending under external forces.

[0049] Specifically, the base body 100 is inserted along the soil profile, the second base 120 is relatively horizontal and in contact with the soil surface, and the first base 110 is relatively vertical, parallel to the soil profile and in contact with the soil profile.

[0050] In some embodiments, please refer to Figure 1 and Figure 2 On the side of the first substrate 110 away from the soil profile, there are multiple first snap-fit ​​pieces 111 for snapping temperature sensing needles and second snap-fit ​​pieces 112 for snapping moisture probes. During the storage and transportation of the entire device for in-situ monitoring of temperature and moisture changes in soil profiles, the temperature sensing needles can be snapped into the first snap-fit ​​pieces 111, and the moisture probes can be snapped into the second snap-fit ​​pieces 112. This allows for the organization and storage of multiple moisture probes and temperature sensing needles, preventing the loss or misplacement of temperature sensing needles and moisture probes, and protecting the slender measuring instruments from bending and damage.

[0051] In the specific implementation process, both the first snap fastener 111 and the second snap fastener 112 are elastic snap fasteners. The internal space of the elastic snap fastener can match the outer diameter of the temperature sensing needle or the moisture probe to fix the temperature sensing needle or the moisture probe in place, ensuring the integrity of the measuring instrument during storage and transportation.

[0052] In some embodiments, please refer to Figure 1 , Figure 5 and Figure 6The moisture detection component 300 also includes a positioning unit 310, which can position the moisture probe. The positioning unit 310 includes a connecting part 311, a positioning ring 312, and a connecting rope 313 disposed on one side of the first base 110. One end of the connecting rope 313 is connected to the connecting part 311, and the other end of the connecting rope 313 is connected to the positioning ring 312. The connecting rope 313 is relatively stretched and horizontally positioned. The distance between the connecting part 311 and the second base 120 is the depth to which the positioning ring 312 penetrates the soil, and the length of the connecting rope 313 is the distance between the positioning ring 312 and the first base 110. By setting the position of the connecting part 311 and the length of the connecting rope 313, the position of the positioning ring 312 can be accurately set. The moisture probe is inserted into the positioning ring 312 and is constrained by the positioning ring 312, aligning with the position of the positioning ring 312, thus achieving the positioning of the moisture probe.

[0053] In practical implementation, the connecting part 311 is a connecting groove formed on the side of the first base 110. One end of the connecting rope 313 is connected to the connecting groove, and the other end is connected to the positioning ring 312. The positioning ring 312 can be a rope loop, and the connecting rope 313 is specifically a rigid rope that is not extendable. The distance between the upper connecting part 311 and the second base 120 is 50mm, and the distance between the lower connecting part 311 and the second base 120 is 100mm. The length of the connecting rope 313 is 100mm. By setting the position of the connecting part 311 and the length of the connecting rope 313, the moisture probe can be quickly positioned and the actual measurement requirements are met.

[0054] Compared with existing technologies, in actual operation, it is often necessary to use a measuring tape to measure the horizontal and vertical directions on the cross-section to complete the positioning of the moisture probe, which is cumbersome and has poor positioning accuracy. In this solution, the moisture probe is indirectly positioned by directly setting the position and length of the connecting part 311 and the connecting rope 313, which is fast and has high positioning accuracy.

[0055] As a further embodiment, the first base 110 has a marking groove 113 positioned relative to the connecting rope 313. The marking groove 113 is horizontally positioned to help keep the connecting rope 313 horizontal, thereby ensuring that the equipment is in an accurate horizontal position during installation. The marking groove 113 serves as an auxiliary tool, helping operators quickly determine whether the connecting rope 313 is horizontal during installation without the need for manual adjustment or additional tools. By simply placing the connecting rope 313 into the marking groove 113 and adjusting its position, the correct operating condition of the equipment can be ensured.

[0056] In many soil monitoring devices, maintaining a level position is a key factor in ensuring accurate measurement results. A level sensor can collect data (such as moisture and temperature) more precisely, avoiding measurement errors caused by tilting.

[0057] Workflow: First, dig a shallow pit (200mm long, 50mm wide, and 120mm deep) in the field, and smooth one side of the pit with a small shovel. Then, attach the second substrate 120 and the first substrate 110 to the ground surface and the soil profile, respectively. The second substrate 120 supports the first substrate 110 and limits its depth. Insert multiple temperature sensing needles into different insertion holes 210, with the needles inserted into the soil along the soil profile in a "T" arrangement. Then, align the marking groove 113, straighten the connecting rope 313, and insert the moisture probe into the soil along the soil profile through the positioning ring 312. Soil temperature and moisture content measurements are taken every 15 minutes, starting at the top of the hour. Using the measured temperature and moisture content, estimate the soil heat capacity and thermal conductivity at each depth, and calculate the soil evaporation rate at the corresponding time based on the principle of thermal equilibrium.

[0058] The specific calculation and evaluation methods are as follows:

[0059] The latent heat flux density of water in the soil layer can be calculated from the difference in sensible heat flux and the change in sensible heat storage. Then, it can be converted into the soil evaporation rate through the latent heat of vaporization of water. The calculation formula is as follows:

[0060] (1)

[0061] In Equation (1), E is the evaporation rate (mm·s-1), Hu and Hl are the soil sensible heat flux densities at the upper and lower boundaries of the soil layer (W·m-2), ∆S is the change in soil heat storage within the soil layer (W·m-2), and L is the latent heat of vaporization (J·m-3).

[0062] Based on the principle of thermal equilibrium, the temperature T (°C) at different depths of the surface soil is automatically monitored. Combined with the soil moisture content θv (m3·m-3) measured in real time by the soil moisture probe, the dynamic evaporation rate E of the soil at different depths can be calculated.

[0063] According to the principle of sensible heat balance, the evaporation rate E (mm·s⁻¹) of a certain soil layer is (calculated as follows): Figure 7 (as shown)

[0064] (2)

[0065] Where Hu and Hl are the heat fluxes at the depths of the upper and lower surfaces of the soil layer (W·m-2), respectively, ΔS is the change in heat storage within the soil layer (W·m-2), and L is the latent heat of vaporization (2.45×109 J·m-3).

[0066] The E-type thermocouple in the nine-needle soil temperature profile sensor records the soil temperature Tz at each depth z every 15 minutes. Using Fourier's law, Hu and Hl are calculated from the difference between the thermal conductivity λ (W·m⁻¹·K⁻¹) at the upper and lower surfaces and the measured temperature at the corresponding depth z.

[0067] (3)

[0068] Where z1 and z2 represent two different soil depths, Tz1 and Tz2 represent the temperature measurements at the corresponding depths, and the thermal conductivity λ is estimated using the Tian-de Vries model:

[0069] (4)

[0070] Where λw (0.60 W·m⁻¹·K⁻¹), λa (0.025 W·m⁻¹·K⁻¹), and λs are the thermal conductivity coefficients of soil water, air, and soil particles, respectively; fa = 1 - θw - ρb / ρs is the volume ratio of air in the soil (m³·m⁻³), ρs is the soil particle density (2.65 Mg·m⁻³), and ρb is the measured soil bulk density (Mg·m⁻³); ka and ks are the weighting coefficients for soil air and solids, respectively. The parameter λs is estimated based on the soil texture fraction, i.e.:

[0071] (5)

[0072] Wherein, λsand (7.70 W·m⁻¹·K⁻¹), λsilt (2.74 W·m⁻¹·K⁻¹), and λclay (1.93 W·m⁻¹·K⁻¹) are the thermal conductivity coefficients of sand, silt, and clay particles in the soil, respectively; fsand, fsilt, and fclay are the proportions of sand, silt, and clay particles in the soil (decimals, the sum of the three equals 1).

[0073] In formula (2), ΔS is calculated from the soil's internal heat capacity C (MJ·m⁻³·℃⁻¹) and the temperature change per unit time.

[0074] (6)

[0075] Where t1 and t2 represent two different measurement times, Tt1 and Tt2 represent the temperature measurements (°C) at the corresponding times, and z1 and z2 are two different soil depths in formula (3). The heat capacity C is estimated using the de Vries model:

[0076] (7)

[0077] Where Cw is the heat capacity of water (4.18 MJ·m-3·℃-1) and Cs is the heat capacity of soil solids (2.31 MJ·m-3·℃-1).

[0078] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A device for in-situ monitoring of temperature and moisture changes in a soil profile, used to calculate the soil evaporation rate, characterized in that, include: The base body includes a first base disposed parallel to the soil profile; A temperature sensing component includes multiple temperature sensing needles and pin holes disposed on the first substrate. The multiple pin holes are arranged in a "T" shape. The multiple pin holes located at the bottom are arranged vertically relative to each other. The multiple temperature sensing needles are respectively inserted into the soil through the pin holes to measure the temperature of the soil at different depths. A moisture detection assembly, comprising a moisture probe for measuring soil moisture content, wherein at least two moisture probes are disposed on one side of the first substrate and are arranged vertically at intervals between them.

2. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The spacing between the plurality of pin holes located at the bottom is gradually increased from top to bottom.

3. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The plurality of pin holes located at the top are horizontally spaced apart, and the horizontal spacing between the pin holes is consistent; the vertical spacing between the plurality of pin holes is gradually increased from top to bottom.

4. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The temperature sensing needle includes an outer jacket and an E-type thermocouple, wherein the E-type thermocouple is disposed therein, and a high thermal conductivity material is filled between the E-type thermocouple and the outer jacket.

5. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The moisture probe includes a stainless steel electrode and a time-domain reflectometer, which is electrically connected to the stainless steel electrode.

6. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The base body also includes a second base, which is horizontally arranged and integrally connected to the top of the first base. The second base can abut against the soil plane and support the entire base body.

7. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 1, characterized in that, The first substrate has a plurality of first snap-fit ​​pieces for snapping the temperature sensing needle and a second snap-fit ​​piece for snapping the moisture probe on the side away from the soil profile.

8. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 7, characterized in that, The moisture detection component further includes a positioning unit, which includes a connecting part, a positioning ring, and a connecting rope disposed on one side of the first base. One end of the connecting rope is connected to the connecting part, and the other end of the connecting rope is connected to the positioning ring. The connecting rope is relatively stretched and horizontally arranged, and the moisture probe is inserted into the positioning ring.

9. The device for in-situ monitoring of temperature and moisture changes in soil profiles according to claim 8, characterized in that, The first base has a marking groove that is positioned relative to the connecting rope. The marking groove is horizontal and can help keep the connecting rope horizontal.

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