Test field irrigation equipment based on soil water-salt-inorganic carbon coupling

Abstract

The invention discloses test field irrigation equipment based on soil water-salt-inorganic carbon coupling, which comprises a bent water hose and a bent guide structure, an irrigation water hose is embedded in the top of the bent water hose, a sliding support plate is arranged on one side of the bent water hose and the irrigation water hose, and the bent water hose, the irrigation water hose and the sliding support plate surround a test area. The sliding supporting plate is arranged between the inner arc surfaces of the bent water hose and the irrigation water hose in a sliding mode, an irrigation area is arranged between one side of the sliding supporting plate and the inner arc surfaces of the bent water hose and the irrigation water hose, the sides, close to the sliding supporting plate, of the bent water hose and the irrigation water hose are communicated, and the bent water hose encloses the irrigation area after being expanded after being supplied with water. A plurality of water outlet heads are arranged on the irrigation water hose, water is injected into the irrigation area, and the bent guide structure is arranged in the bent area of the bent water hose and the irrigation water hose. The device is used for solving the problem that in the prior art, when irrigation equipment is used for irrigating a test field, it is difficult to divide a test area and guarantee the accurate water supply amount.

Description

Technical Field

[0001] This invention relates to the field of experimental field irrigation technology, specifically to an experimental field irrigation device based on soil water-salt-inorganic carbon coupling. Background Technology

[0002] Under the dual pressures of global climate change and escalating soil salinization, the stability and regulation of soil carbon pools have become core issues for achieving micro-ecological balance and the "dual carbon" goal. Soil inorganic carbon, as a crucial component of the terrestrial carbon pool, with reserves ranging from 695 to 2300 PgC, plays a key "regulator" role in the global carbon cycle. Especially in arid and semi-arid regions, the sequestration and loss of inorganic carbon directly affect the atmospheric CO2 concentration balance, significantly impacting climate change. Soil salinization is the most significant land degradation process in modern society, and salinized land also has high inorganic carbon reserves. This is because the core characteristics of saline-alkali soils are high salinity and high pH values. Their unique physicochemical properties significantly alter the transformation process of inorganic carbon. Salinization regulates soil pH, thereby affecting CO2 dissolution and carbonate deposition, determining the form and sequestration efficiency of inorganic carbon. On the other hand, salt ions (such as Ca2+)... 2+ Mg 2+ Cl - The migration and accumulation of inorganic carbon can interfere with the adsorption, precipitation and leaching processes of inorganic carbon, resulting in significant spatial heterogeneity in the inorganic carbon retention capacity. Furthermore, the retention capacity is prone to reversal under high salinity and alkalinity conditions, increasing the risk of carbon loss.

[0003] Therefore, technical experiments related to saline-alkali soil and inorganic carbon sequestration need to focus on a systematic comparison of the differences in inorganic carbon sequestration under different saline-alkali soils and different degrees of salinization. It is difficult to reveal the coupling law between salinization characteristics and inorganic carbon sequestration risks, and the identification of inorganic carbon sequestration risks is not comprehensive enough. It focuses more on the single risk of carbon loss and has insufficient research on potential risks such as wind attenuation of sequestration and transformation imbalance, which is difficult to support risk prevention and control practices. Therefore, long-term and multiple experiments are needed to conduct experiments on the long-term coupling of soil water-salt-inorganic carbon.

[0004] The experiment first required dividing the land into multiple experimental zones. During the prolonged salinization process in each zone, agricultural irrigation water was applied periodically. The experiment involved observing and testing soil groundwater depth, mineralization, and electrical conductivity before and after each irrigation. Analytical tests included soil particle analysis, pH value, total salt content, and HCO3- content. 3- CO3 2- SO4 2- CL - Ca 2+Mg 2+ K + Na + content.

[0005] However, in the actual experiment, there are two key technical challenges when irrigating the independent experimental areas of the experimental field: First, it is necessary to ensure that the diffusion area of ​​water in the soil of the experimental area meets the experimental design requirements during the irrigation process, and that the irrigation volume is precisely matched to the experimental needs. Second, most of the irrigation enclosures used to divide the experimental areas in the existing technology need to be buried to a certain depth at the bottom of the experimental area to divide the experimental field into multiple independent experimental areas for the convenience of comparison experiments. However, this enclosure method will cut off the exchange of substances and water between the experimental area and the natural environment soil, interfere with the natural evolution process of soil salinization in the experimental area, and affect the authenticity and accuracy of the experiment.

[0006] Furthermore, strictly controlling the amount of irrigation water during the irrigation process is quite difficult: during irrigation, water will temporarily remain on the soil surface and then be gradually absorbed through soil permeability. In existing irrigation methods, when the water flow is cut off after the irrigation amount is determined, it is affected by both the timing of the cut-off and fluctuations in the water supply. This not only makes it difficult to ensure precise control of the irrigation amount, but also affects the uniform distribution of water in the experimental area, resulting in uneven distribution of soil moisture and salt in different areas. This, in turn, interferes with the accurate study of the coupling law of soil water-salt-inorganic carbon, affects the reliability and scientific nature of the experimental data, and makes it difficult to meet the technical requirements of long-term experiments. Summary of the Invention

[0007] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an experimental field irrigation device based on soil water-salt-inorganic carbon coupling, which solves the problem mentioned in the background art that it is difficult to divide the experimental area and ensure accurate water supply when the irrigation device irrigates the experimental field.

[0008] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an experimental field irrigation device based on soil water-salt-inorganic carbon coupling, comprising: A curved water hose is provided, with an irrigation water hose fitted at the top. A sliding support plate is provided on one side of the curved water hose and the irrigation water hose. The curved water hose, the irrigation water hose, and the sliding support plate enclose the test area. The sliding support plate is slidably disposed between the inner arc surfaces of the curved water hose and the irrigation water hose. The area between one side of the sliding support plate and the inner arc surfaces of the curved water hose and the irrigation water hose is designated as the irrigation area. The curved water hose and the irrigation water hose are connected on the side near the sliding support plate. After the curved water hose expands with water, it encloses the irrigation area. The irrigation water hose is equipped with multiple water outlets to inject water into the irrigation area. A bending guide structure is provided in the bending area of ​​the bending water hose and the irrigation water hose, and the bending guide structure also supports the sliding support plate; A water level detection device, wherein the water level detection device is provided on the side of the sliding support plate facing the irrigation area; The sliding support plate is provided with a plurality of the stretch drainage structures. After the water level rises in the irrigation area, the two sides of the sliding support plate are connected through the stretch drainage structures, and excess water is discharged from the irrigation area.

[0009] The bottom of the curved water hose is provided with a T-shaped fastener, and the bottom of the curved water hose and the T-shaped fastener are buried in the test field.

[0010] The top of the curved water hose is provided with an engagement groove, and the bottom of the irrigation water hose is provided with an engagement protrusion, which extends into the engagement groove.

[0011] Flexible clamps are provided on both sides of the sliding support plate, and the inner arc surface of the flexible clamps is in contact with the outer wall of the curved water hose and the irrigation water hose.

[0012] It also includes an irrigation water pipe and a threaded cap. The water outlet head is provided with an external thread section. The irrigation water pipe is threadedly connected to the water outlet head through the external thread section. The irrigation water pipe has multiple water outlet holes. The irrigation water pipe is set in the irrigation area. The water outlet head located outside the irrigation area is sealed by the threaded cap.

[0013] The bottom of the sliding support plate is set as an inclined surface, and multiple fixed rods are provided at the bottom of the inclined surface. The fixed rods and the inclined surface enter into the soil.

[0014] The bending guide structure includes two support rods, a support trough, and a movable trough. The support rods are placed in the soil outside the test area. The bending water hose and the irrigation water hose bend along the outer walls of the two support rods. The support trough is fixedly connected between the two support rods. A connecting rod pushing assembly is provided between the support trough and the movable trough to push the movable trough to move laterally.

[0015] Multiple through cylinders are fixedly connected to the movable slot frame, and the through cylinders abut against one side of the sliding support plate.

[0016] The tension drainage structure includes a sliding water pipe and a metal traction wire. A sliding sleeve is fixedly connected through the bottom of the sliding support plate. The sliding water pipe passes through the sliding sleeve. An abutment piece is fixedly sleeved on the side of the sliding water pipe facing the irrigation area. A damping sleeve is fixedly connected through the sliding support plate. The metal traction wire passes through the damping sleeve. One side of the metal traction wire is connected to the abutment piece.

[0017] During irrigation, the metal traction wire is pulled to pull the sliding water pipe so that the end of the sliding water pipe facing the irrigation area is upward. During drainage, the sliding water pipe is pulled to keep it parallel and drain excess water from the irrigation area.

[0018] (III) Beneficial Effects Compared with existing technologies, this invention provides an experimental field irrigation device based on soil water-salt-inorganic carbon coupling, which has the following beneficial effects: 1. When it is necessary to divide the experimental field into multiple experimental zones, according to the size of each experimental zone, firstly, dig a U-shaped trench around the experimental zone that matches the bottom of the curved water belt. Then, place the curved water belt and irrigation water belt together along the U-shaped trench. Use a curved guide structure to support the curved surface of the curved water belt and irrigation water belt, and use a sliding support plate to determine the final irrigation experimental zone. During the irrigation process, the irrigation water is first allowed to circulate fully in the curved water belt and then discharged through the water outlets connected to the irrigation zone. The curved water belt will expand during the water flow, thus collecting the irrigation water before discharging it. This effectively prevents water leakage from the irrigation zone during the irrigation process. Moreover, the burial depth of the curved water belt is not large, so it does not affect the connection between the experimental zone and the natural soil, thus ensuring a high-quality experimental soil environment.

[0019] 2. The bending guide structure of the present invention can guide and support the bending area of ​​the bending water hose and irrigation water hose, and can also drive the moving trough frame to support the sliding support plate, so that the sliding support plate can stably enclose the test area. Furthermore, the component used in the present invention to support the sliding support plate is a through cylinder, which can not only support the sliding support plate, but also use an insertable soil moisture detection device to detect the moisture in the soil adjacent to the test area, thereby judging the irrigation situation in the test area.

[0020] 3. To ensure accurate irrigation during the test area, multiple irrigation pipes are used to evenly distribute irrigation water to various areas within the test area, allowing water to gradually accumulate. Once the water level reaches the height detected by the water level monitoring equipment, water supply to the test area is stopped. As water continues to seep into the test area, after a period of irrigation, the position of the sliding water pipe is adjusted to keep it parallel, draining excess water from the irrigated area. By controlling the settling and discharge of irrigation water within the test area, precise irrigation operations are achieved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an experimental field irrigation device based on soil water-salt-inorganic carbon coupling, as disclosed in the embodiments of this application; Figure 2 For this application Figure 1 A structural diagram from another perspective; Figure 3 For this application Figure 2 A magnified structural diagram of point A in the middle; Figure 4 For this application Figure 1 A schematic diagram showing the separation of the water hose and irrigation hose in the middle bend; Figure 5 For this application Figure 4 A magnified structural diagram of point B in the middle section; Figure 6 For this application Figure 1 A partial sectional view of the structure of the supporting rod, the supporting slot, and the movable slot in coordination; Figure 7 For this application Figure 1 A schematic diagram of the structure of the sliding support plate, sliding water pipe, sliding sleeve and metal traction wire.

[0022] In the diagram: 1. Curved water hose; 2. Irrigation water hose; 3. Sliding support plate; 4. Irrigation area; 5. Water outlet; 6. Water level detection equipment; 7. T-shaped fastener; 8. Engaging groove; 9. Engaging protrusion; 10. Flexible clamp; 11. Irrigation water pipe; 12. Water outlet; 13. Threaded cap; 14. Fixed insertion rod; 15. Supporting insertion rod; 16. Supporting trough frame; 17. Moving trough frame; 18. Through cylinder; 19. Sliding water pipe; 20. Sliding sleeve; 21. Abutment plate; 22. Metal traction wire; 23. Damping sleeve; 24. Connecting joint; 25. Water injection valve pipe; 26. Push support rod; 27. Fixed rotating seat; 28. Sliding rotating seat; 29. ​​Transmission screw; 30. Drain valve pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In order to create suitable experimental field samples for long-term experiments on inorganic carbon sequestration and coupling in saline-alkali soils, when conducting irrigation operations within the corresponding experimental areas of the experimental field, please refer to [the relevant documentation / reference]. Figures 1 to 7 An experimental field irrigation device based on soil water-salt-inorganic carbon coupling includes a curved water belt 1, an irrigation water belt 2 fitted on the top of the curved water belt 1, and a sliding support plate 3 on one side of the curved water belt 1 and the irrigation water belt 2. The curved water belt 1, the irrigation water belt 2, and the sliding support plate 3 enclose the experimental area. The sliding support plate 3 is slidably positioned between the inner arc surfaces of the curved water belt 1 and the irrigation water belt 2. The area between one side of the sliding support plate 3 and the inner arc surfaces of the curved water belt 1 and the irrigation water belt 2 is designated as an irrigation area 4. According to the experimental area divided in the experimental field, a U-shaped trench is dug outside the experimental area. The curved water belt 1 and the irrigation water belt 2 are distributed along the U-shaped trench, and the two sides of the sliding support plate 3 are attached to the inner arc surfaces of the curved water belt 1 and the irrigation water belt 2 to achieve the enclosure of the experimental area.

[0025] The bottom of the curved water hose 1 is equipped with a T-shaped fastener 7, please refer to [link / reference]. Figure 2 The bottom of the curved water hose 1 and the T-shaped fastener 7 were buried in the experimental field, and then backfilled with soil to ensure the stability of the curved water hose 1 outside the experimental area and prevent the curved water hose 1 from moving during irrigation. The burial depth of the curved water hose 1 and the T-shaped fastener 7 is not high, so it does not affect the difference between the natural parameters such as soil air tightness in the experimental area and the natural environment. However, during long-term observation and active modification of the soil salinization length in the experimental area, there will be no situation where soil salinization spreads from the experimental area to the public area of ​​the experimental field.

[0026] The top of the curved water hose 1 is provided with an engaging groove 8, and the bottom of the irrigation water hose 2 is provided with an engaging protrusion 9. Please refer to [link / reference]. Figure 4The engaging protrusion 9 extends into the engaging groove 8, and a drain valve pipe 30 is connected to one side of the irrigation water belt 2. The discharge end of the drain valve pipe 30 faces the test area. After the irrigation operation in the test area is completed, in order to avoid residual irrigation water in the irrigation water belt 2, which could lead to fermentation of the subsequent irrigation water in the irrigation water belt 2 and affect the continuous use of the irrigation water belt 2, in the process of using this invention, after the irrigation is completed, the irrigation water belt 2 can be lifted upward along the direction of water flow, so that the engaging protrusion 9 moves out of the engaging groove 8, and the water flows to one side of the drain valve pipe 30. Finally, the residual irrigation water in the irrigation water belt 2 is discharged into the test area (non-test period) through the drain valve pipe 30. Moreover, during the water flow process, the curved water hose 1 used in this invention will expand. However, through the meshing relationship between the meshing groove 8 and the meshing protrusion 9, the irrigation water hose 2 can still be stably placed on the surface of the curved water hose 1 after the expansion, thus preventing the irrigation water hose 2 from overturning.

[0027] The curved water hose 1 and the irrigation water hose 2 are connected near the sliding support plate 3 via a connecting joint 24. Please refer to [link / reference]. Figure 5 After the curved water hose 1 expands with water, it encloses the irrigation area 4. The irrigation hose 2 is equipped with multiple water outlets 5 to inject water into the irrigation area 4. It also includes an irrigation pipe 11 and a threaded cap 13. The water outlets 5 have external threads, and the irrigation pipe 11 is threadedly connected to the water outlets 5 through these external threads. The irrigation pipe 11 has multiple water outlet holes 12 and is located within the irrigation area 4. The water outlets 5 located outside the irrigation area 4 are sealed by the threaded caps 13. A water injection valve pipe 25 is connected to the side of the curved water hose 1 away from the sliding support plate 3, allowing water to be injected into the curved water hose 1. The irrigation water flows within the curved water hose 1. The water flows through and causes the curved water belt 1 to expand. After the irrigation water flows from the curved water belt 1 to the side near the sliding support plate 3, it is transported upward to the irrigation water belt 2 through the connection interface. Then, the irrigation water is discharged through the outlet head 5 without the threaded cap 13. In order to achieve uniform irrigation in the test area, an irrigation water pipe 11 can be installed on the outlet head 5 located in the test area by means of a threaded connection. After the irrigation water is transported into the irrigation water pipe 11, it is discharged through multiple outlet holes 12, so that the irrigation water is evenly added to the test area. The water injection valve pipe 25 and the water discharge valve pipe are both equipped with control valves.

[0028] Flexible clamps 10 are provided on both sides of the sliding support plate 3. Please refer to [link / reference]. Figure 4The inner arc surface of the flexible clamp 10 is in contact with the outer wall of the curved water hose 1 and the irrigation water hose 2. When irrigating the test area, it is necessary to ensure that the test area is kept closed to prevent irrigation water loss. The flexible clamp 10 is set on both sides of the sliding support plate 3 by sliding snap-fit. In actual use, after determining the position of the sliding support plate 3, the flexible clamp 10 is used to maintain a sliding connection with the side wall of the sliding support plate 3, so that the flexible clamp 10 is in contact with the outer wall of the irrigation water hose 2 and the curved water hose 1, filling the gap between the sliding support plate 3, the irrigation water hose 2 and the curved water hose 1, and preventing irrigation water loss.

[0029] The bottom of the sliding support plate 3 is set as an inclined surface, and multiple fixed rods 14 are set at the bottom of the inclined surface. The fixed rods 14 and the inclined surface enter into the soil. After the sliding support plate 3 is moved to the edge of the designated test area, the bottom of the sliding support plate 3 and the multiple fixed rods 14 are squeezed into the soil because the bottom of the sliding support plate 3 is an inclined surface, so that the sliding support plate 3 is fixed and the flexible clamp 10 is used to hold and fix the irrigation water belt 2 and the curved water belt 1.

[0030] The curved guide structure is installed in the curved area of ​​curved water belt 1 and irrigation water belt 2. Please refer to [link / reference]. Figure 6 The bending guide structure supports the sliding support plate 3. The bending guide structure includes two support rods 15, a support trough frame 16, and a movable trough frame 17. The support rods 15 are placed in the soil outside the test area. The bending water belt 1 and the irrigation water belt 2 bend along the outer wall of the two support rods 15. The support trough frame 16 is fixedly connected between the two support rods 15. A connecting rod pushing assembly is provided between the support trough frame 16 and the movable trough frame 17 to push the movable trough frame 17 to move laterally. The bending water belt 1 and the irrigation water belt 2 bend along the outer wall of the support rods 15, creating a separate rectangular area between the bending water belt 1, the irrigation water belt 2 and the sliding support plate 3. In order to further improve the lateral support of the sliding support plate 3, the position of the movable trough frame 17 is adjusted by the connecting rod pushing assembly to support the sliding support plate 3.

[0031] The linkage push assembly includes two push rods 26, which are connected at their middle parts by a pin. Fixed rotating seats 27 and sliding rotating seats 28 are rotatably connected to the two sides of the two push rods 26, respectively. Fixed rotating seats 27 are fixedly installed on both the support frame 16 and the movable frame 17, and sliding rotating seats 28 are slidably connected to both the support frame 16 and the movable frame 17. A transmission screw 29 is rotatably connected to the support frame 16. The sliding rotating seats 28, which are slidably installed on the support frame 16, are threadedly connected to the transmission screw 29 through a threaded seat. By driving the sliding rotating seats 28 to slide on the support frame 16, the two push rods 26 are brought together and push the movable frame 17 to move towards the sliding support plate 3.

[0032] Multiple through cylinders 18 are fixedly connected to the movable trough frame 17. The through cylinders 18 abut against one side of the sliding support plate 3, driving the movable trough frame 17 to move so that the multiple through cylinders 18 abut against the sliding support plate 3. An immersion-type soil moisture detection device can also be used to detect the moisture in the soil adjacent to the test area, thereby determining the irrigation situation in the test area. Soil moisture detection devices that can be used in conjunction with this invention include a variety of electronic devices that use a probe to insert into the soil for moisture detection, such as a TDR soil moisture meter.

[0033] A water level detection device 6 is installed on the side of the sliding support plate 3 facing the irrigation area 4. Please refer to [link / reference]. Figure 7 First, the water level detection device 6 needs to be installed at the bottom of the sliding support plate 3 at the corresponding height. The timing of stopping water injection is determined by the installation height of the sensing section of the water level detection device 6. In the actual use of this invention, the water level on the surface of the test area is raised to be aligned with the sensing end of the water level detection device 6. After the sensing end of the water level detection device 6 senses the irrigation water level, it reminds the test personnel to stop the supply of irrigation water to the curved water belt 1.

[0034] Multiple tension drainage structures are provided on the sliding support plate 3. Please refer to [link / reference]. Figure 7 After the water level rises in irrigation area 4, the sliding support plate 3 is connected on both sides by a stretching drainage structure, allowing excess water to be discharged from irrigation area 4. The stretching drainage structure includes a sliding water pipe 19 and a metal traction wire 22. A sliding sleeve 20 is fixedly connected through the bottom of the sliding support plate 3, and the sliding water pipe 19 passes through the sliding sleeve 20. An abutment piece 21 is fixedly fitted on the side of the sliding water pipe 19 facing irrigation area 4. A damping sleeve 23 is fixedly connected through the sliding support plate 3, and the metal traction wire 22 passes through the damping sleeve 23. One side of the metal traction wire 22 is connected to the abutment piece 21. When it is necessary to drain excess water from the test area... When water is discharged, the side end of the sliding water pipe 19 opposite to the irrigation area 4 is pulled to keep the sliding water pipe 19 parallel to the sliding sleeve 20, and to keep the abutment piece 21 in contact with the side end of the sliding sleeve 20. Then, water is discharged from the irrigation area 4 through the sliding water pipe 19 at a speed much greater than that of water seeping into the soil. During the irrigation process, the metal traction wire 22 is pulled to pull the sliding water pipe 19 so that the end of the sliding water pipe 19 facing the irrigation area 4 is upward, so that the sliding water pipe 19 is at the top height of the irrigation area 4, higher than the irrigation water level. At this time, water will not be discharged through the sliding water pipe 19.

[0035] To irrigate the experimental field used for soil water-salt-inorganic carbon coupling experiments, the working principle of this experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling is as follows: First, the experimental area is demarcated in the experimental field. Then, a U-shaped trench is dug around the experimental area. Next, the bending area of ​​the curved water hose 1 and irrigation water hose 2 is selected, and two support rods 15 are inserted into the soil. Then, the curved water hose 1 and irrigation water hose 2 are arranged along the U-shaped trench, and the inner arc surfaces of the curved water hose 1 and irrigation water hose 2 are bent to fit against the two support rods 15, so that the sliding support plate 3 can seal one side of the experimental area. After determining the position of the sliding support plate 3, it is knocked downwards to make the bottom of the sliding support plate 3 and multiple fixing rods 14 enter the soil and keep the sliding support plate 3 fixed. Then, two flexible clamps 10 are used to keep the sliding support plate 3, curved water hose 1 and irrigation water hose 2 sealed. The sliding support plate 3 is supported by the cooperation of the moving trough frame 17, the support trough frame 16 and the connecting rod push assembly.

[0036] During irrigation, water is injected into the curved water belt 1 through the water injection valve pipe 25. The irrigation water flows within the curved water belt 1 and causes it to expand. After the irrigation water flows from the curved water belt 1 to the side near the sliding support plate 3, it is then transported upwards to the irrigation water belt 2 through the connection interface. The irrigation water is then discharged through the outlet head 5 without the threaded cap 13. In order to achieve uniform irrigation in the test area, an irrigation water pipe 11 can be installed on the outlet head 5 located in the test area through a threaded connection. After the irrigation water is transported into the irrigation water pipe 11, it is discharged through multiple outlet holes 12, so that the irrigation water is evenly injected into the test area. The outlet head 5 located outside the irrigation area 4 is sealed with a threaded cap 13.

[0037] During irrigation, the water discharge rate is faster than the rate at which water penetrates into the soil. As the water level rises, it is sensed by the sensing end of the water level detection device 6, which then alerts the staff to stop watering. The water is then left to stand, allowing it to penetrate into the soil of the test area. The soil moisture detection device can then be used to detect the water diffusion at the position of the through-tube 18 close to the test area. After the soil in the test area absorbs the irrigation water, the side end of the sliding water pipe 19 on the opposite side of the irrigation area 4 is pulled to keep the sliding water pipe 19 parallel to the sliding sleeve 20 and to keep the abutment piece 21 in contact with the side end of the sliding sleeve 20. Then, the water is discharged from the irrigation area 4 through the sliding water pipe 19 at a rate much faster than the rate at which water penetrates into the soil. This invention is used to assist testers in detecting the soil groundwater depth, mineralization, and electrical conductivity before and after irrigation in the test area.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental field irrigation device based on soil water-salt-inorganic carbon coupling, characterized in that, include: A curved water hose (1) is fitted with an irrigation water hose (2) at its top. A sliding support plate (3) is provided on one side of the curved water hose (1) and the irrigation water hose (2). The curved water hose (1), the irrigation water hose (2) and the sliding support plate (3) enclose the test area. The sliding support plate (3) is slidably disposed between the inner arc surfaces of the curved water hose (1) and the irrigation water hose (2). An irrigation area (4) is set between one side of the sliding support plate (3) and the inner arc surfaces of the curved water hose (1) and the irrigation water hose (2). The curved water hose (1) and the irrigation water hose (2) are connected on the side near the sliding support plate (3). After the curved water hose (1) expands with water, it encloses the irrigation area (4). The irrigation water hose (2) is provided with multiple water outlets (5) to inject water into the irrigation area (4). A bending guide structure is provided in the bending area of ​​the bending water belt (1) and the irrigation water belt (2), and the bending guide structure supports the sliding support plate (3); Water level detection device (6), the sliding support plate (3) is provided with the water level detection device (6) on the side facing the irrigation area (4); The sliding support plate (3) is provided with a plurality of the stretch drainage structures. After the water level rises in the irrigation area (4), the two sides of the sliding support plate (3) are connected through the stretch drainage structures, and excess water is discharged from the irrigation area (4).

2. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 1, characterized in that, The bottom of the curved water hose (1) is provided with a T-shaped fastener (7), and the bottom of the curved water hose (1) and the T-shaped fastener (7) are buried in the test field.

3. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 2, characterized in that, The top of the curved water hose (1) is provided with an engagement groove (8), and the bottom of the irrigation water hose (2) is provided with an engagement protrusion (9), which extends into the engagement groove (8).

4. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 3, characterized in that, Flexible clips (10) are provided on both sides of the sliding support plate (3), and the inner arc surface of the flexible clips (10) is in contact with the outer wall of the curved water hose (1) and the irrigation water hose (2).

5. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 4, characterized in that, Also includes: An irrigation water pipe (11) is provided with an external thread section on the water outlet (5). The irrigation water pipe (11) is threadedly connected to the water outlet (5) through the external thread section. The irrigation water pipe (11) is provided with multiple water outlet holes (12). The irrigation water pipe (11) is located in the irrigation area (4). A threaded cap (13) is used to seal the outlet (5) located outside the irrigation area (4).

6. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 4, characterized in that, The bottom of the sliding support plate (3) is set as an inclined surface, and a plurality of fixed rods (14) are provided at the bottom of the inclined surface. The fixed rods (14) and the inclined surface enter into the soil.

7. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 4, characterized in that, The bending guide structure includes: Two support rods (15) are provided. The support rods (15) are placed in the soil outside the test area. The curved water belt (1) and the irrigation water belt (2) are curved along the outer wall of the two support rods (15). The support slot frame (16) and the movable slot frame (17) are fixedly connected between the two support rods (15). A connecting rod pushing assembly is provided between the support slot frame (16) and the movable slot frame (17) to push the movable slot frame (17) to move laterally.

8. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 7, characterized in that, Multiple through cylinders (18) are fixedly connected to the movable slot frame (17), and the through cylinders (18) abut against one side of the sliding support plate (3).

9. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 6, characterized in that, The tension drainage structure includes: A sliding water pipe (19) is fixedly connected to the bottom of the sliding support plate (3) through a sliding sleeve (20). The sliding water pipe (19) passes through the sliding sleeve (20). An abutment piece (21) is fixedly sleeved on the side of the sliding water pipe (19) facing the irrigation area (4). A metal traction wire (22) is fixedly connected to the sliding support plate (3). The metal traction wire (22) is disposed inside the damping sleeve (23). One side of the metal traction wire (22) is connected to the abutment piece (21).

10. The experimental field irrigation equipment based on soil water-salt-inorganic carbon coupling according to claim 9, characterized in that, During irrigation, the metal traction wire (22) is pulled to pull the sliding water pipe (19) so that the end of the sliding water pipe (19) facing the irrigation area (4) is facing upward. During drainage, the sliding water pipe (19) is pulled to keep the sliding water pipe (19) parallel and drain the excess water in the irrigation area (4).

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