A trunk sap flow and tree growth combined observation system

Abstract

The application discloses a trunk sap flow and tree growth combined observation system, which comprises two or more positioning mechanisms, the two or more positioning mechanisms are installed on the trunk along the height direction of the trunk, the two ends of the two or more positioning mechanisms are installed on the trunk through annular hoops, a fixing ring is installed on the middle part of the positioning mechanism, support pieces are uniformly and fixedly installed on the side wall of the fixing ring along the circumferential direction of the fixing ring, a support mechanism is coaxially sleeved on the fixing ring, the support mechanism is rotatably connected on the support pieces, and constant-pressure tree diameter measuring mechanisms are oppositely installed on the two sides of the support mechanism. The positioning mechanism can play the limiting and guiding roles on the fixing ring, the measuring angle and the trunk inclination are effectively avoided, the inaccurate measurement is avoided, the measurement accuracy is improved, the support mechanism which can be relative to the fixing ring is arranged, the influence caused by the gravity is eliminated, and the measurement precision is improved.

Description

Technical Field

[0001] This invention relates to the field of tree observation technology. Specifically, it is a combined observation system for tree trunk sap flow and tree growth. Background Technology

[0002] Tree diameter at breast height (DBH) measurement is the most direct method for observing tree growth. The measurement is taken at 1.3 meters on the trunk using a ruler. However, this method is very inconvenient for long-term tree observation, requiring repeated measurements periodically. Furthermore, tilting the tree during measurement can cause significant deviations and lead to inaccurate measurements. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a combined observation system for tree trunk sap flow and tree growth that can improve the accuracy of measurement.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a combined observation system for tree trunk sap flow and tree growth, comprising two or more positioning mechanisms, which are installed on the tree trunk along the height direction of the trunk. Both ends of the two or more positioning mechanisms are installed on the tree trunk via annular hoops. A fixing ring is installed in the middle of each positioning mechanism. Support plates are uniformly fixed along the circumference of the side wall of the fixing ring. A support mechanism is coaxially sleeved on the fixing ring. The support mechanism is rotatably connected to the support plates. Constant pressure tree diameter measuring mechanisms are installed opposite each other on both sides of the support mechanism. The end of the constant pressure tree diameter measuring mechanism abuts against the surface of the tree trunk. A flow measuring mechanism is installed on the tree trunk, and a sealing assembly is installed between the flow measuring mechanism and the surface of the tree trunk.

[0005] The aforementioned combined observation system for tree trunk sap flow and tree growth includes a positioning mechanism comprising an elastic plate, a support plate, and a limiting buckle. Support blocks are fixedly installed on both inner ends of the elastic plate, with the sidewalls of the support blocks adhering to the tree trunk. Slots are fixedly installed on both outer ends of the elastic plate, and an annular clamp is inserted into these slots. A limiting buckle is slidably fitted onto the middle of the elastic plate. The support plate is positioned on the outer side of the elastic plate, and the end of the limiting buckle is fixedly connected to the support plate. Pressure plates are fixedly installed on both ends of the support plate, and a fixed device is mounted on the end of each pressure plate. The support plate is equipped with upper clamping plates, and rollers are provided at both ends of the support plate. The two ends of the central shaft of the rollers are rotatably installed in the upper clamping plates. The rollers roll against the outer wall of the elastic plate. Push plates are provided on both sides of the elastic plate. The push plates are made of elastic material. Lower clamping plates are installed on both ends of the push plates. The lower clamping plates are respectively fitted on the central shaft of the two rollers. Positioning blocks are fixedly installed on both ends of the outer side of the support plate. The fixing rings are sleeved on the support plate, and the two sides of the fixing rings are respectively in contact with the side walls of the positioning blocks.

[0006] The aforementioned tree trunk sap flow and tree growth combined observation system includes a support mechanism comprising a first support rod and a second support rod arranged parallel to each other. A spacing adjustment component is installed between the ends of the first support rod and the second support rod. The constant pressure tree diameter measuring mechanism is mounted on the spacing adjustment component. Two or more first screws are threadedly connected to the opposite sidewalls of the first support rod and the second support rod. A limiting roller is installed on the end of the first screw. An annular groove is formed in the middle of the limiting roller, and the support plate is inserted into the annular groove.

[0007] The aforementioned combined observation system for tree trunk sap flow and tree growth includes a spacing adjustment component comprising a sliding sleeve, a bidirectional screw, and a guide rod. Sliding sleeves are slidably fitted onto the ends of both the first and second support rods. A fixing bolt is threaded onto the side wall of each sliding sleeve, with the other end of the fixing bolt inserted and pressed against the side wall of either the first or second support rod. Nuts are threaded onto both ends of the bidirectional screw, and the two nuts are respectively fixedly installed on the two sliding sleeves. Guide sleeves are installed on both ends of the guide rod, and the two guide sleeves are respectively fixedly installed on the two sliding sleeves. A fixing block is fixedly installed on the middle portion of the guide rod. The optical axis portion of the middle part of the bidirectional screw is rotatably installed within the fixing block. The constant pressure tree diameter measuring mechanism is installed on the fixing block.

[0008] The aforementioned combined observation system for tree trunk sap flow and tree growth includes a constant-pressure tree diameter measuring mechanism comprising a support cylinder and a pressure cylinder. The support cylinder is fixedly mounted on a fixed block, and an arc-shaped plate is fixedly mounted on the piston rod end of the support cylinder, pressing against the tree trunk. A hinge plate is hinged to the bottom of the fixed block via a hinge seat, and the pressure cylinder is mounted parallel to the side wall of the hinge plate. A placement groove is fixedly mounted on the side wall of the hinge plate, and the piston rod of the pressure cylinder is inserted into the placement groove. A counterweight is installed in the placement groove, pressing against the piston rod end of the pressure cylinder. The two pressure cylinders are interconnected via pipelines, and the pressure cylinder is connected to the support cylinder via pipelines.

[0009] The above-mentioned combined observation system for tree trunk sap flow and tree growth includes a flow measurement mechanism comprising a measuring probe, a threaded sleeve, and an annular oil bladder. The measuring probe is inserted into the tree trunk, the threaded sleeve is threadedly connected to the measuring probe, and the annular oil bladder is fitted onto the measuring probe and located between the tree trunk and the threaded sleeve. A fixed cylinder is fitted onto the middle of the annular oil bladder, one end of which is fixedly connected to the threaded sleeve. The end of the annular oil bladder near the tree trunk extends outward from the fixed cylinder, and the annular oil bladder is connected to a pressure cylinder via a pipeline.

[0010] The aforementioned combined observation system for tree trunk sap flow and tree growth includes a fixing ring consisting of two connected ends of a metal strip. A connecting mechanism is installed on the ends of the metal strip. The connecting mechanism includes a first connecting plate and a second connecting plate. The first connecting plate is hinged to one end of the metal strip, and a connecting groove is formed on the other end of the metal strip. A connecting block is fixedly connected to the side wall of the second connecting plate, and the connecting block is inserted into the connecting groove. A sliding rod is fixedly installed on the side wall of the first connecting plate, and the other end of the sliding rod is slidably engaged with the second connecting plate. A second screw is threaded through the first connecting plate, and the other end of the second screw is threadedly connected to the second connecting plate.

[0011] The technical solution of the present invention achieves the following beneficial technical effects:

[0012] 1. This invention, by setting a positioning mechanism, can limit and guide the fixed ring, effectively avoiding inaccurate measurements caused by the tilt of the measurement angle and the tree trunk, and improving the accuracy of the measurement.

[0013] 2. This invention, by setting up a support mechanism that can fix the ring relatively, addresses the issue that tree trunks tend to tilt to a certain extent in practice. When the installed measuring fixture is not located on either side of the tilt direction of the tree trunk, the fixture will be affected by gravity, thus affecting the measurement accuracy. However, this invention, through a rotatable support mechanism, balances the weight on both sides of the support mechanism, allowing the two support cylinders to be located on either side of the tilt direction parallel to the ground, thereby eliminating the influence of gravity and improving measurement accuracy. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of the present invention;

[0015] Figure 2 A schematic diagram of the positioning mechanism of this invention;

[0016] Figure 3 A schematic diagram of the support mechanism of this invention;

[0017] Figure 4 A schematic diagram of the connection mechanism of the present invention;

[0018] Figure 5 A schematic diagram of the flow measurement mechanism of this invention.

[0019] The reference numerals in the figure are as follows: 1-Positioning mechanism; 101-Elastic plate; 102-Support block; 103-Slot; 104-Support plate; 105-Positioning block; 106-Limit buckle; 107-Roller; 108-Pressure plate; 109-Push plate; 110-Lower clamping plate; 111-Upper clamping plate; 2-Fixing ring; 3-Supporting piece; 4-Supporting mechanism; 401-First support rod; 402-Second support rod; 403-Gap adjustment assembly; 404-Fixing block; 405-First screw; 406-Limiting roller; 407-Sliding sleeve; 408-Bidirectional screw 409-Nut; 410-Guide sleeve; 411-Guide rod; 5-Constant pressure tree diameter measuring mechanism; 501-Support cylinder; 502-Hinge plate; 503-Pressure cylinder; 504-Placement groove; 505-Arc plate; 506-Measuring ruler; 6-Flow measuring mechanism; 601-Measuring probe; 602-Threaded sleeve; 603-Fixing cylinder; 604-Annular oil bladder; 7-Annular hoop; 8-Connecting mechanism; 801-First connecting plate; 802-Second connecting plate; 803-Slide rod; 804-Second screw; 805-Connecting block; 806-Connecting groove. Detailed Implementation

[0020] This embodiment describes a combined observation system for trunk sap flow and tree growth. Please refer to [link to relevant documentation]. Figure 1-2 The system includes two or more positioning mechanisms 1, which are installed on the trunk along the height direction. Both ends of the two or more positioning mechanisms 1 are installed on the trunk through ring hoops 7. A fixing ring 2 is installed in the middle of the positioning mechanism 1. Support plates 3 are evenly fixedly installed on the side wall of the fixing ring 2 along its circumference. A support mechanism 4 is coaxially sleeved on the fixing ring 2. The support mechanism 4 is rotatably connected to the support plate 3. Constant pressure tree diameter measuring mechanisms 5 are installed opposite each other on both sides of the support mechanism 4. The end of the constant pressure tree diameter measuring mechanism 5 abuts against the surface of the trunk. A flow measuring mechanism 6 is installed on the trunk. A sealing assembly is installed between the flow measuring mechanism 6 and the surface of the trunk.

[0021] like Figure 2As shown, the positioning mechanism 1 includes an elastic plate 101, a support plate 104, and a limiting buckle 106. Support blocks 102 are fixedly installed on both ends of the inner side of the elastic plate 101, and the sidewalls of the support blocks 102 are attached to the tree trunk. Slots 103 are fixedly installed on both ends of the outer side of the elastic plate 101, and the annular clamp 7 is inserted into the slots 103. The limiting buckle 106 is slidably sleeved on the middle of the elastic plate 101. The support plate 104 is located on the outer side of the elastic plate 101, and the end of the limiting buckle 106 is fixedly connected to the support plate 104. Pressure plates 108 are fixedly installed on both ends of the support plate 104, and upper clamping tiles 111 are fixedly installed on the end of the pressure plates 108. Rollers 107 are provided at both ends of the support plate 104. The two ends of the central shaft of the 7 are rotatably installed in the upper clamping tile 111. The roller 107 rolls against the outer wall of the elastic plate 101. Push plates 109 are provided on both sides of the elastic plate 101. The push plates 109 are made of elastic material. Lower clamping tiles 110 are installed on both ends of the push plates 109. The lower clamping tiles 110 are respectively fitted on the central shaft of the two rollers 107. Positioning blocks 105 are fixedly installed on both ends of the outer side of the support plate 104. The fixing ring 2 is sleeved on the support plate 104, and the two sides of the fixing ring 2 are respectively attached to the side wall of the positioning block 105. By setting the positioning mechanism 1, the fixing ring 2 can play a limiting and guiding role, effectively avoiding the measurement angle and the trunk tilt, which would cause inaccurate measurement and improve the accuracy of measurement.

[0022] like Figure 3 As shown, the support mechanism 4 includes a first support rod 401 and a second support rod 402 arranged parallel to each other. A spacing adjustment component 403 is installed between the ends of the first support rod 401 and the second support rod 402. The constant pressure tree diameter measuring mechanism 5 is installed on the spacing adjustment component 403. Two or more first screws 405 are threadedly connected to the opposite side walls of the first support rod 401 and the second support rod 402. A limiting roller 406 is installed on the end of the first screw 405. An annular groove is opened in the middle of the limiting roller 406. The support plate 3 is inserted into the annular groove. By setting a support mechanism 4 that can fix the ring 2, in practice, the tree trunk will have a certain degree of tilt. When the installed measuring fixture is not on both sides of the tilt direction of the tree trunk, the fixture will be affected by gravity, thus affecting the measurement accuracy. However, in this invention, through the rotatable support mechanism 4, the weight on both sides of the support mechanism 4 is balanced, so that the two support cylinders 501 can be located on both sides of the tilt direction parallel to the ground, so as to eliminate the influence of gravity and improve the measurement accuracy.

[0023] like Figure 3As shown, the spacing adjustment assembly 403 includes a sliding sleeve 407, a bidirectional screw 408, and a guide rod 411. Sliding sleeves 407 are slidably fitted onto the ends of the first support rod 401 and the second support rod 402. A fixing bolt is threaded onto the side wall of the sliding sleeve 407, and the other end of the fixing bolt is inserted and pressed against the side wall of the first support rod 401 or the second support rod 402. Nuts 409 are threaded onto both ends of the bidirectional screw 408, and the two nuts 409 are respectively fixedly installed on the two sliding sleeves 407. Guide sleeves 410 are installed on both ends of the guide rod 411, and the two guide sleeves 410 are respectively fixedly installed on the two sliding sleeves 407. A fixing block 404 is fixedly installed on the middle part of the guide rod 411. The optical axis portion of the middle part of the bidirectional screw 408 is rotatably installed within the fixing block 404. The constant pressure tree diameter measuring mechanism 5 is installed on the fixing block 404.

[0024] like Figure 3 As shown, the constant pressure tree diameter measuring mechanism 5 includes a support cylinder 501 and a pressure cylinder 503. The support cylinder 501 is fixedly mounted on a fixed block 404. An arc-shaped plate 505 is fixedly mounted on the piston rod end of the support cylinder 501, and the arc-shaped plate 505 presses against the tree trunk. A hinge plate 502 is hinged to the bottom of the fixed block 404 through a hinge seat. The pressure cylinder 503 is installed parallel to the side wall of the hinge plate 502. A placement groove 504 is fixedly mounted on the side wall of the hinge plate 502. The piston rod of the pressure cylinder 503 is inserted into the placement groove 504. A counterweight is installed in the placement groove 504, and the counterweight presses against the piston rod end of the pressure cylinder 503. The two pressure cylinders 503 are interconnected through pipelines, and the pressure cylinder 503 is connected to the support cylinder 501 through pipelines.

[0025] like Figure 5 As shown, the flow measurement mechanism 6 includes a measuring probe 601, a threaded sleeve 602, and an annular oil bladder 604. The measuring probe 601 is inserted into the tree trunk, the threaded sleeve 602 is threaded onto the measuring probe 601, and the annular oil bladder 604 is fitted onto the measuring probe 601 and located between the tree trunk and the threaded sleeve 602. A fixing cylinder 603 is fitted onto the middle part of the annular oil bladder 604, one end of the fixing cylinder 603 is fixedly connected to the threaded sleeve 602, and the end of the annular oil bladder 604 near the tree trunk extends outward from the fixing cylinder 603. The annular oil bladder 604 is connected to the pressure cylinder 503 through a pipeline.

[0026] like Figure 3-4As shown, the fixing ring 2 is composed of two connected ends of a metal strip. A connecting mechanism 8 is installed on the end of the metal strip. The connecting mechanism 8 includes a first connecting plate 801 and a second connecting plate 802. The first connecting plate 801 is hinged to one end of the metal strip. A connecting groove 806 is opened on the other end of the metal strip. A connecting block 805 is fixedly connected to the side wall of the second connecting plate 802. The connecting block 805 is inserted into the connecting groove 806. A sliding rod 803 is fixedly installed on the side wall of the first connecting plate 801. The other end of the sliding rod 803 is slidably engaged with the second connecting plate 802. A second screw 804 is provided through the first connecting plate 801. The other end of the second screw 804 is threadedly connected to the second connecting plate 802.

[0027] Workflow: First, place four positioning mechanisms 1 at equal intervals around the tree trunk, ensuring the support blocks 102 fit against the trunk. Then, secure both ends of the positioning mechanisms 1 to the trunk using two annular hoops 7. The annular hoops 7 are engaged in the slots 103, ensuring the ends of the elastic plates 101 are flush. Under gravity, the support plates 104 are positioned below the elastic plates 101. Next, the fixing rings 2 are fitted onto the support plates 104. The two ends of the fixing rings 2 are connected by the first connecting plate 801 and the second connecting plate 802. Tighten the second screw 804, bringing the first connecting plate 801 and the second connecting plate 802 closer together to tighten the fixing rings 2. Apply inward pressure to the four elastic plates 101, causing them to bend inward and spring back. The support force in the middle of the support plate 101 is the weakest, and the bending degree in the middle is the greatest. As the fixing ring 2 tightens, the support plate 104 moves gradually inward to the middle under the action of the roller 107 until it reaches the lowest point of the inward concavity. When the push plate 109 contacts the tree trunk, the fixing ring 2 continues to tighten. The lower clamping plate 110 and the upper clamping plate 111 clamp the end of the roller 107, making it unable to rotate, thus fixing the fixing ring 2. The fixing ring 2 is circular and plays a positioning and guiding role during the deformation of the positioning mechanism 1. It can ensure that the fixing ring 2 is coaxial with the tree trunk as much as possible. At the same time, it can avoid directly installing the entire device on the tree trunk at the position to be detected, reducing the pressure applied to the tree trunk and improving the measurement accuracy.

[0028] Then install the support mechanism 4. During installation, first rotate the two outermost first screws 405 on the first support rod 401 and the two outermost first screws 405 on the second support rod 402, so that the corresponding limiting rollers 406 protrude by the same distance, forming four positioning points. Rotate the bidirectional screws 408 at both ends, so that the first support rod 401 and the second support rod 402 move inward simultaneously to match the outer diameter of the fixing ring 2. When the rollers 406 on the first support rod 401 and the second support rod 402 can both contact the support plate 3, continue to rotate the bidirectional screws 408 to insert the support plate 3 into the annular groove of the roller 406. Then, rotate all the first screws 405 on the two support rods in sequence to make all the rollers 406 cooperate with the support plate 3, realizing the matching connection between the support mechanism 4 and the positioning mechanism 1; move the sliding sleeve 407 to bring the constant pressure tree diameter measuring mechanism 5 closer to the trunk, and ensure that the two sides are... The constant pressure tree diameter measuring mechanism 5 is equidistant from the center point of the support rod. Then, the fixing bolts are tightened to fix the sliding sleeve 407, and the support for the support mechanism 4 is loosened so that it can rotate freely. When the tree is tilted, due to the balance of gravity at both ends of the two support rods, the two constant pressure tree diameter measuring mechanisms 5 can be located on both sides of the tilt direction of the trunk, avoiding uneven pressure on both sides of the trunk due to the weight of the support cylinder 501. The corresponding weight of the counterweight is placed in the hinge plate 502, and the hinge plate 502 can automatically become vertical under the action of gravity. Under the action of the counterweight, the pressure cylinder 503 provides pressure to the support cylinder 501, so that the arc plate 505 fits against the trunk. When the trunk diameter changes, it pushes the support cylinders 501 on both sides to move, and the measurement is achieved in conjunction with the measuring ruler 506. When precise measurement is required, a displacement sensor can be installed between the arc plate 505 and the fixing block 404 to achieve accurate real-time position measurement.

[0029] Insert the measuring probe 601 into the location on the tree trunk where the flow needs to be measured, rotate the threaded sleeve 602 to move the annular oil bladder 604 forward, so that the annular oil bladder 604 fits against the surface of the tree trunk, and connect the annular oil bladder 604 to the pressure cylinder 503 through the pipeline. Under pressure, the annular oil bladder 604 expands and fits against the tree trunk, thereby sealing the gap between the tree trunk and the measuring probe 601, thus achieving the purpose of wind and rain protection and preventing the wound on the tree trunk from rotting.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A combined observation system for tree sap flow and tree growth, characterized in that, It includes two or more positioning mechanisms (1), which are installed on the trunk along the height direction of the trunk. The two ends of the two or more positioning mechanisms (1) are installed on the trunk through ring hoops (7). A fixing ring (2) is installed in the middle of the positioning mechanism (1). A support plate (3) is evenly fixed on the side wall of the fixing ring (2) along its circumference. A support mechanism (4) is coaxially sleeved on the fixing ring (2). The support mechanism (4) is rotatably connected to the support plate (3). A constant pressure tree diameter measuring mechanism (5) is installed opposite to each other on both sides of the support mechanism (4). The end of the constant pressure tree diameter measuring mechanism (5) abuts against the surface of the trunk. A flow measuring mechanism (6) is installed on the trunk. A sealing component is installed between the flow measuring mechanism (6) and the surface of the trunk. The positioning mechanism (1) includes an elastic plate (101), a support plate (104), and a limiting buckle (106). Support blocks (102) are fixedly installed on both ends of the inner side of the elastic plate (101). The sidewalls of the support blocks (102) are attached to the tree trunk. Slots (103) are fixedly installed on both ends of the outer side of the elastic plate (101). The annular hoop (7) is inserted into the slot (103). The limiting buckle (106) is slidably sleeved on the middle part of the elastic plate (101). The support plate (104) is located on the outer side of the elastic plate (101). The end of the limiting buckle (106) is fixedly connected to the support plate (104). Pressure plates (108) are fixedly installed on both ends of the support plate (104). Upper clamping tiles (111) are fixedly installed on the end of the pressure plates (108). Rollers (107) are provided at both ends of the support plate (104). The two ends of the central shaft of the rollers (107) are rotatably installed in the upper clamping tile (111). The rollers (107) roll against the outer wall of the elastic plate (101). Push plates (109) are provided on both sides of the elastic plate (101). The push plates (109) are made of elastic material. Lower clamping tiles (110) are installed on both ends of the push plates (109). The lower clamping tiles (110) are respectively fitted on the central shaft of the two rollers (107). Positioning blocks (105) are fixedly installed on both ends of the outer side of the support plate (104). The fixing ring (2) is sleeved on the support plate (104), and the two sides of the fixing ring (2) are respectively attached to the side wall of the positioning block (105). The support mechanism (4) includes a first support rod (401) and a second support rod (402) arranged in parallel with each other. A spacing adjustment component (403) is installed between the end of the first support rod (401) and the end of the second support rod (402). The constant pressure tree diameter measuring mechanism (5) is installed on the spacing adjustment component (403). Two or more first screws (405) are threaded on the opposite side walls of the first support rod (401) and the second support rod (402). A limiting roller (406) is installed on the end of the first screw (405). An annular groove is opened in the middle of the limiting roller (406). The support plate (3) is inserted into the annular groove.

2. The combined observation system for tree trunk sap flow and tree growth according to claim 1, characterized in that, The spacing adjustment assembly (403) includes a sliding sleeve (407), a bidirectional screw (408), and a guide rod (411). Sliding sleeves (407) are slidably fitted onto the ends of both the first support rod (401) and the second support rod (402). A fixing bolt is threaded onto the side wall of the sliding sleeve (407), and the other end of the fixing bolt is inserted and pressed against the side wall of the first support rod (401) or the second support rod (402). Nuts (411) are threaded onto both ends of the bidirectional screw (408). 09), the two nuts (409) are respectively fixedly installed on the two sliding sleeves (407), the guide sleeves (410) are installed on both ends of the guide rod (411), the two guide sleeves (410) are respectively fixedly installed on the two sliding sleeves (407), the fixing block (404) is fixedly installed on the middle part of the guide rod (411), the optical axis part of the middle part of the bidirectional screw (408) is rotatably installed in the fixing block (404), and the constant pressure tree diameter measuring mechanism (5) is installed on the fixing block (404).

3. The combined observation system for tree trunk sap flow and tree growth according to claim 2, characterized in that, The constant pressure tree diameter measuring mechanism (5) includes a support cylinder (501) and a pressure cylinder (503). The support cylinder (501) is fixedly installed on a fixed block (404). An arc-shaped plate (505) is fixedly installed on the piston rod end of the support cylinder (501). The arc-shaped plate (505) is pressed against the tree trunk. A hinge plate (502) is hinged to the bottom of the fixed block (404) through a hinge seat. Parallel installations are mounted on the side wall of the hinge plate (502). The pressure cylinder (503) has a placement groove (504) fixedly installed on the side wall of the hinge plate (502). The piston rod of the pressure cylinder (503) is inserted into the placement groove (504). A counterweight is installed in the placement groove (504). The counterweight presses on the end of the piston rod of the pressure cylinder (503). The two pressure cylinders (503) are connected to each other through pipelines. The pressure cylinder (503) is connected to the support cylinder (501) through pipelines.

4. The combined observation system for tree trunk sap flow and tree growth according to claim 3, characterized in that, The flow measurement mechanism (6) includes a measuring probe (601), a threaded sleeve (602), and an annular oil bladder (604). The measuring probe (601) is inserted into the tree trunk. The threaded sleeve (602) is threaded onto the measuring probe (601). The annular oil bladder (604) is fitted onto the measuring probe (601) and located between the tree trunk and the threaded sleeve (602). A fixing cylinder (603) is fitted onto the middle part of the annular oil bladder (604). One end of the fixing cylinder (603) is fixedly connected to the threaded sleeve (602). The end of the annular oil bladder (604) near the tree trunk extends outward from the fixing cylinder (603). The annular oil bladder (604) is connected to the pressure cylinder (503) through a pipeline.

5. The combined observation system for tree trunk sap flow and tree growth according to claim 1, characterized in that, The fixing ring (2) is composed of two ends of a metal strip connected together. A connecting mechanism (8) is installed on the end of the metal strip. The connecting mechanism (8) includes a first connecting plate (801) and a second connecting plate (802). The first connecting plate (801) is hinged to one end of the metal strip. A connecting groove (806) is opened on the other end of the metal strip. A connecting block (805) is fixedly connected to the side wall of the second connecting plate (802). The connecting block (805) is inserted into the connecting groove (806). A sliding rod (803) is fixedly installed on the side wall of the first connecting plate (801). The other end of the sliding rod (803) is slidably engaged with the second connecting plate (802). A second screw (804) is provided through the first connecting plate (801). The other end of the second screw (804) is threadedly connected to the second connecting plate (802).

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