A windbreak and sand-fixing forest degradation degree measuring instrument and measuring method

Abstract

The present invention relates to the technical field of vegetation diameter measurement, and in particular to an instrument and method for measuring the degree of degradation of a windbreak and sand-fixing forest, comprising two clamping frames that are symmetrically distributed on the left and right, the clamping frames being triangular structures, and a reinforcing rod being installed in the middle of the clamping frames; a rectangular rod, which is arranged at the lower end of the clamping frames located on the right; and a distance adjusting device, which is connected to the left end of the rectangular rod, and is connected to the lower end of the clamping frames located on the left. The gripping mechanism and the adjusting device used in the present invention cooperate to drive the clamping frame to be in close contact with the tree trunk by a simple pressing method, and ensure that the clamping frame always clamps the tree trunk when measuring the tree trunk, thereby avoiding the phenomenon of slight separation between the clamping frame and the tree trunk due to hand shaking of the measurement personnel, and effectively improving the accuracy and stability of the trunk measurement.

Description

Technical Field

[0001] The invention relates to the technical field of vegetation diameter measurement, and in particular to an instrument and a method for measuring the degree of degradation of a windbreak and sand-fixing forest. Background Art

[0002] Windbreak and sand-fixing forests in desertified areas are important measures to deal with land degradation, prevent desert expansion and protect the ecological environment. The vegetation of windbreak and sand-fixing forests is generally dominated by trees and shrubs. Due to global climate change, temperatures have risen, precipitation has decreased, and extreme weather events have increased. These changes have exerted tremendous pressure on the vegetation of windbreak and sand-fixing forests in desertified areas, and the vegetation of windbreak and sand-fixing forests will gradually degenerate. At present, the degree of degradation of windbreak and sand-fixing forests can be measured through a variety of methods and indicators, mainly through vegetation coverage, vegetation structure, soil characteristics, surface cover and terrain characteristics. Among them, the measurement of vegetation structure is the most common measurement method, which is generally evaluated by the diameter of trees in the windbreak and sand-fixing forest after a certain period of time of planting.

[0003] The specific process is to select representative tree species, and in the early stage of tree planting, use a measuring ruler to record the diameters of a certain number of trees to obtain initial diameter data; then set a fixed measurement time interval, such as measuring once a year or every two years, and record the diameter of each tree each time it is measured and compared with the initial data; then calculate the diameter growth rate of each tree, that is, the diameter increment each year or each period of time, and evaluate the overall tree growth status; finally, combine vegetation coverage, soil properties, surface cover and terrain characteristics to conduct a comprehensive assessment of the degree of degradation of the windbreak and sand fixation forest; the above-mentioned annual measurement is used to evaluate the degree of degradation of the windbreak and sand fixation forest. The method of using a ruler to record the diameters of a certain number of trees has the following defects: when using the ruler, the measuring rod on one side is first slid to separate the two measuring rods of the ruler, and then the ruler is pressed against the tree trunk, and then the measuring rods on both sides of the trunk are combined and pressed against the trunk, and then the measurement value of the ruler is read out. However, the ruler is usually hand-held by the surveyor when in use, and there is a phenomenon that the surveyor's hand shakes during the measurement process, resulting in inaccurate measurement results. In addition, during measurement, the two measuring rods are no longer subjected to force after the position is adjusted, and there is a slight gap between the measuring rods and the tree trunk, thereby reducing the accuracy of the measurement results. Summary of the invention

[0004] Based on this, it is necessary to provide an instrument and method for measuring the degree of degradation of windbreak and sand-fixing forests, aiming to solve the problems arising from the existing technology when measuring the tree diameters of windbreak and sand-fixing forests.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme: an instrument for measuring the degree of degradation of windbreak and sand fixation forests, comprising: two clamping frames distributed symmetrically on the left and right, the clamping frames are triangular structures, and a reinforcing rod is installed in the middle of the clamping frames.

[0006] It also includes a rectangular rod, which is arranged at the lower end of the clamping frame located on the right side.

[0007] It also includes a distance adjusting device, which is connected to the left end of the rectangular rod and the lower end of the clamping frame on the left side.

[0008] It also includes an adjusting device, which is arranged on the rectangular rod. The adjusting device includes a sliding groove opened at the upper end of the rectangular rod, a moving mechanism is arranged in the sliding groove, a sliding mechanism is arranged on the outer periphery of the rectangular rod, and the sliding mechanism is connected to the clamping frame located on the right side.

[0009] The moving mechanism comprises a moving rod slidably connected in the sliding groove, the moving rod is detachably connected to the sliding mechanism, a connecting strip is installed at the right end of the moving rod, and the right end of the connecting strip slides through the right end of the rectangular rod.

[0010] It also includes a clamping device, which is connected to the right end of the rectangular rod. The clamping device includes a holding mechanism for pushing the connecting strip to move and a limiting mechanism for limiting the position of the holding mechanism.

[0011] A rectangular plate is installed at the front end of the two clamping frames, and a distance measuring module is installed on the rectangular plate on the left side.

[0012] According to an embodiment of the present invention, the distance adjusting device includes a guide rod installed on the left end of the rectangular rod, a sliding frame is slidably sleeved on the guide rod, the upper end of the sliding frame is fixedly connected to the clamping frame located on the left side, a plurality of positioning through holes evenly distributed from left to right are opened on the guide rod, a positioning screw is threadedly connected to the bottom wall of the sliding frame near the right end, and the positioning screw is plugged into and matched with any one of the positioning through holes.

[0013] According to an embodiment of the present invention, the moving mechanism also includes a plurality of limiting holes opened at the upper end of the moving rod and evenly distributed from left to right, a cylindrical groove is opened on the left groove wall of the sliding groove, and a connecting spring is installed between the vertical side wall of the cylindrical groove and the left end of the moving rod.

[0014] According to an embodiment of the present invention, the sliding mechanism includes a U-shaped frame with its opening facing toward a sliding connection on the outer periphery of the rectangular rod, a fixing plate is installed on the upper end of the U-shaped frame, the fixing plate is fixedly connected to the clamping frame located on the right side, a U-shaped rod with its opening facing downward is inserted into the fixing plate, and the lower end of the U-shaped rod is plugged into and cooperates with any two adjacent limiting holes.

[0015] According to an embodiment of the present invention, the holding mechanism includes a holding frame hinged on the right end of the rectangular rod, the holding frame is a U-shaped structure with an opening facing forward, and a spring telescopic rod is hinged between the inner end of the vertical section of the holding frame and the right end of the connecting strip.

[0016] According to an embodiment of the present invention, the limiting mechanism comprises a strip plate installed at the right end of the rectangular rod, a connecting block is installed at the right end of the rectangular rod, and a limiting sleeve is provided on the peripheral sliding sleeve of the connecting block.

[0017] According to an embodiment of the present invention, a plurality of cylindrical rods evenly distributed from front to back are installed on the hypotenuse section of the clamping frame, and the cylindrical rods are in a vertical state.

[0018] In addition, the present invention also provides a method for measuring the degree of degradation of windbreak and sand-fixing forests, which specifically includes the following steps: S1: before measurement, adjust the distance adjusting device according to the approximate diameter of the trees on the land to be measured, and the distance adjusting device changes the distance between the two clamping frames.

[0019] S2: Then, the position of the corresponding clamping frame on the moving mechanism is adjusted to fine-tune the distance between the two clamping frames.

[0020] S3: The surveyor holds a rectangular rod and moves to the tree to be measured, and then moves the rectangular rod toward the trunk. The rectangular rod drives the two clamping frames to move to both sides of the trunk through the distance adjustment device and the adjustment device.

[0021] S4: The surveyor holds the holding mechanism, and the holding mechanism drives the moving mechanism to move, thereby driving the corresponding clamping frame to move toward the tree trunk and ensuring that the two clamping frames clamp the tree trunk.

[0022] S5: Start the distance measurement module, which cooperates with the rectangular plate on the other side to obtain the measurement result, then release the grip of the gripping mechanism, and then separate the two clamping frames from the tree trunk, and the measurement is completed.

[0023] In summary, the present invention includes the following beneficial effects: 1. The holding mechanism and the adjusting device adopted in the present invention can drive the clamping frame to be tightly attached to the tree trunk by a simple pressing method, and ensure that the clamping frame always clamps the tree trunk when measuring the tree trunk, avoiding the phenomenon of slight separation between the clamping frame and the tree trunk due to hand shaking of the measurement personnel, thereby effectively improving the accuracy and stability of the trunk measurement.

[0024] 2. The clamping frame and reinforcing rod used in the present invention can effectively improve the force stability of the clamping frame when measuring the diameter of the tree trunk, avoid bending of the clamping frame, thereby avoiding the inconsistency between the length between the clamping points of the two clamping frames and the length between the measuring points, and further improve the accuracy of the measurement.

[0025] 3. The distance adjustment device and the regulating device used in the present invention can both adjust the distance between the two clamping frames, so that it can be suitable for measuring trees of different sizes within a certain range, effectively improving the applicability of the measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 A schematic diagram of the three-dimensional structure of the present invention at a first viewing angle is shown.

[0028] Figure 2 A schematic diagram of the three-dimensional structure of the present invention from a second viewing angle is shown.

[0029] Figure 3 A front view of the present invention is shown.

[0030] Figure 4 A left side view of the present invention is shown.

[0031] Figure 5 Shows Figure 4 Sectional view of AA.

[0032] Figure 6 The schematic diagram of the structure of the rectangular rod, the sliding groove, the moving mechanism and the clamping device of the present invention is shown.

[0033] Among them, the above-mentioned drawings include the following figure marks: 1. clamping frame; 11. reinforcing rod; 12. cylindrical rod; 2. rectangular rod; 3. distance adjustment device; 31. guide rod; 32. sliding frame; 33. positioning through hole; 34. positioning screw; 4. adjustment device; 41. sliding groove; 42. moving mechanism; 421. moving rod; 422. connecting strip; 423. limiting hole; 424. cylindrical groove; 425. connecting spring; 43. sliding mechanism; 431. U-shaped frame; 432. fixing plate; 433. U-shaped rod; 5. clamping device; 51. holding mechanism; 511. holding frame; 512. spring telescopic rod; 52. limiting mechanism; 521. strip plate; 522. connecting block; 523. limiting sleeve; 6. rectangular plate; 7. ranging module. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] See also Figure 1 and Figure 2 A degradation degree measuring instrument for windbreak and sand-fixing forests comprises two clamping frames 1 which are symmetrically distributed on the left and right. The clamping frames 1 are triangular structures. A reinforcing rod 11 is installed in the middle of the clamping frames 1. A plurality of cylindrical rods 12 which are evenly distributed from front to back are installed on the hypotenuse section of the clamping frames 1. The cylindrical rods 12 are in a vertical state, and the outer wall surface of the cylindrical rods 12 is coplanar with the hypotenuse section surface of the clamping frame 1.

[0036] See also Figure 1-Figure 4 The instrument for measuring the degree of degradation of the windbreak and sand-fixing forest also includes a rectangular rod 2, which is arranged at the lower end of the clamping frame 1 located on the right side.

[0037] See also Figure 1 The instrument for measuring the degree of degradation of windbreak and sand-fixing forests also includes a distance adjusting device 3, which is connected to the left end of the rectangular rod 2, and the distance adjusting device 3 is connected to the lower end of the clamping frame 1 on the left side.

[0038] See also Figure 1 , Figure 2 and Figure 5 The distance adjustment device 3 includes a guide rod 31 installed at the left end of the rectangular rod 2, a sliding frame 32 is slidably sleeved on the guide rod 31, the upper end of the sliding frame 32 is fixedly connected to the clamping frame 1 located on the left side, and a plurality of positioning through holes 33 evenly distributed from left to right are opened on the guide rod 31. A positioning screw 34 is threadedly connected to the bottom wall of the sliding frame 32 near the right end, and the positioning screw 34 is plugged into and matched with any one of the positioning through holes 33.

[0039] During specific work, before measurement, according to the approximate diameter of the trees on the land to be measured, the sliding frame 32 is moved, and the sliding frame 32 drives the clamping frame 1 located on the left to move, thereby changing the distance between the two clamping frames 1 to meet the measurement requirements, and then the positioning screw 34 is threadedly connected to the sliding frame 32 and fed into the corresponding positioning through hole 33, so as to realize the function of limiting the sliding clamping frame 1.

[0040] See also Figure 1 and Figure 5 The instrument for measuring the degree of degradation of windbreak and sand-fixing forests also includes an adjusting device 4, which is arranged on the rectangular rod 2. The adjusting device 4 includes a sliding groove 41 opened at the upper end of the rectangular rod 2, and a moving mechanism 42 is arranged in the sliding groove 41. A sliding mechanism 43 is arranged on the outer periphery of the rectangular rod 2, and the sliding mechanism 43 is connected to the clamping frame 1 located on the right side.

[0041] See also Figure 1 , Figure 5 and Figure 6The moving mechanism 42 includes a moving rod 421 slidably connected to the sliding groove 41, and the moving mechanism 42 also includes a plurality of limiting holes 423 opened at the upper end of the moving rod 421 and evenly distributed from left to right.

[0042] See also Figure 1 , Figure 5 and Figure 6 The sliding mechanism 43 includes a U-shaped frame 431 with an opening facing toward the sliding connection on the outer periphery of the rectangular rod 2, a fixing plate 432 is installed on the upper end of the U-shaped frame 431, and the fixing plate 432 is fixedly connected to the clamping frame 1 located on the right side, and a U-shaped rod 433 with an opening facing downward is inserted on the fixing plate 432, and the lower end of the U-shaped rod 433 is inserted and matched with any two adjacent limiting holes 423.

[0043] During specific operation, the U-shaped rod 433 and the corresponding limiting hole 423 are initially in a separated state. After the adjustment of the sliding frame 32 is completed, the U-shaped frame 431 is slid according to the actual measured diameter of the trunk. The U-shaped frame 431 drives the clamping frame 1 on the right to move through the fixed plate 432, and the distance between the two clamping frames 1 is fine-tuned to make the distance between the two clamping frames 1 larger than the required measured diameter of the trunk. Then, the U-shaped rod 433 passes through the fixed plate 432 and is inserted into the corresponding two limiting holes 423 to realize the function of limiting the adjusted clamping frame 1.

[0044] The surveyor holds the rectangular rod 2 and moves it to the tree to be measured, and then moves the rectangular rod 2 toward the trunk. The rectangular rod 2 drives the two clamping frames 1 to move to both sides of the trunk through the distance adjustment device 3 and the sliding mechanism 43, until the moving distance of the ends of the two clamping frames 1 exceeds the radius of the trunk, ensuring that the measuring position after the two clamping frames 1 are clamped is the diameter of the trunk.

[0045] See also Figure 5 and Figure 6 The moving rod 421 is detachably connected to the sliding mechanism 43 , and a connecting strip 422 is installed at the right end of the moving rod 421 , and the right end of the connecting strip 422 slides through the right end of the rectangular rod 2 .

[0046] See also Figure 5 and Figure 6 A cylindrical groove 424 is provided on the left groove wall of the sliding groove 41 , and a connecting spring 425 is installed between the vertical side wall of the cylindrical groove 424 and the left end of the moving rod 421 .

[0047] See also Figure 1 , Figure 5 and Figure 6The instrument for measuring the degree of degradation of windbreak and sand-fixing forests also includes a clamping device 5, which is connected to the right end of the rectangular rod 2. The clamping device 5 includes a holding mechanism 51 for pushing the connecting strip 422 to move and a limiting mechanism 52 for limiting the position of the holding mechanism 51.

[0048] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 The holding mechanism 51 includes a holding frame 511 hinged at the right end of the rectangular rod 2, and the holding frame 511 is a U-shaped structure with an opening facing forward. A spring telescopic rod 512 is hinged between the inner end of the vertical section of the holding frame 511 and the right end of the connecting strip 422.

[0049] See also Figure 1 and Figure 6 The limiting mechanism 52 includes a strip plate 521 installed at the right end of the rectangular rod 2.

[0050] During specific operation, after the two clamping frames 1 move to both sides of the tree trunk, the holding frame 511 is manually pressed, and the holding frame 511 is forced to drive the spring telescopic rod 512 to move. The elastic force of the spring telescopic rod 512 is greater than the elastic force of the connecting spring 425. The spring telescopic rod 512 drives the connecting strip 422 to move, and the connecting strip 422 drives the corresponding clamping frame 1 to move toward the tree trunk through the sliding mechanism 43 and squeezes the connecting spring 425 at the same time until the two clamping frames 1 are tightly attached to both sides of the tree trunk, and the cylindrical rods 12 at the corresponding positions of the two clamping frames 1 are tightly attached to the tree trunk, ensuring that the clamping points of the two clamping frames 1 are perpendicular to the axis of the tree trunk, avoiding the clamping frame 1 from being tilted during the measurement process. If the two clamping frames 1 are tightly attached to the tree trunk, When the holding frame 511 has not yet contacted the strip plate 521, continue to press the holding frame 511, the holding frame 511 squeezes the spring telescopic rod 512, and the spring telescopic rod 512 contracts under the force until the holding frame 511 contacts the strip plate 521 and is parallel to the rectangular rod 2. The squeezed spring telescopic rod 512 continues to squeeze the connecting strip 422 to ensure that the two clamping frames 1 are still in a clamped state when measuring the tree trunk. At the same time, the clamping frame 1 is a triangular structure and cooperates with the reinforcing rod 11, which effectively improves the clamping stability of the clamping frame 1, avoids the clamping frame 1 from bending due to excessive force, and thus avoids the phenomenon of inconsistency between the measured distance and the diameter of the trunk, thereby improving the measurement accuracy.

[0051] See also Figure 6 A connecting block 522 is installed at the right end of the rectangular rod 2, and a limiting sleeve 523 is provided on the outer peripheral sliding sleeve of the connecting block 522.

[0052] During specific operation, after the holding frame 511 and the rectangular rod 2 are in a parallel state, the limit sleeve 523 is moved toward the holding frame 511 until the limit sleeve 523 is mounted on the holding frame 511 and the strip plate 521, thereby realizing the function of limiting the rotated holding frame 511, avoiding the phenomenon of unstable holding caused by the measurement personnel holding for a long time during the measurement process, thereby improving the stability of the measurement.

[0053] See also Figure 2 A rectangular plate 6 is installed at the front end of the two clamping frames 1, and a distance measuring module 7 is installed on the rectangular plate 6 located on the left.

[0054] During specific operation, the distance measuring module 7 is an existing infrared distance measuring instrument. After the limiting sleeve 523 limits the holding frame 511, the distance measuring module 7 is started, and the infrared beam emitted by the distance measuring module 7 floats on the opposite rectangular plate 6. Then, after waiting for the indication on the distance measuring module 7 to stabilize, the indication is recorded, and then the limiting sleeve 523 is reset, the squeezed spring telescopic rod 512 and the connecting spring 425 are reset and drive the holding frame 511 and the connecting strip 422 to reset, and the connecting strip 422 drives the clamping frame 1 on the sliding mechanism 43 to reset through the moving rod 421, thereby releasing the clamping of the tree trunk.

[0055] In addition, the present invention also provides a method for measuring the degree of degradation of windbreak and sand-fixing forests, which specifically includes the following steps: S1: Before measurement, adjust the position of the sliding frame 32 according to the approximate diameter of the trees on the land to be measured, and the sliding frame 32 changes the distance between the two clamping frames 1.

[0056] S2: Then, the position of the corresponding clamping frame 1 on the moving mechanism 42 is adjusted to fine-tune the distance between the two clamping frames 1 .

[0057] S3: The surveyor holds the rectangular rod 2 and moves it to the tree to be measured, and then moves the rectangular rod 2 toward the trunk. The rectangular rod 2 drives the two clamping frames 1 to move to both sides of the trunk through the distance adjustment device 3 and the sliding mechanism 43.

[0058] S4: The measurement personnel holds the holding mechanism 51, and the holding mechanism 51 drives the moving mechanism 42 to move, thereby driving the corresponding clamping frame 1 to move toward the tree trunk and ensuring that the two clamping frames 1 clamp the tree trunk.

[0059] S5: Start the distance measuring module 7, which cooperates with the rectangular plate 6 on the other side to obtain the measurement result, then release the grip of the gripping mechanism 51, and then separate the two clamping frames 1 from the tree trunk, and the measurement is completed.

[0060] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0061] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An instrument for measuring the degree of degradation of windbreak and sand-fixing forests, characterized in that: It comprises two clamping frames (1) which are symmetrically distributed on the left and right, the clamping frames (1) are triangular structures, and a reinforcing rod (11) is installed in the middle of the clamping frames (1); A rectangular rod (2) is arranged at the lower end of the clamping frame (1) located on the right side; A distance adjusting device (3) is connected to the left end of the rectangular rod (2), and the distance adjusting device (3) is connected to the lower end of the clamping frame (1) on the left side; the distance adjusting device (3) is used to adjust the distance between the left and right clamping frames (1); An adjusting device (4) is arranged on the rectangular rod (2), the adjusting device (4) comprises a sliding groove (41) provided at the upper end of the rectangular rod (2), a moving mechanism (42) is arranged in the sliding groove (41), a sliding mechanism (43) is arranged on the outer periphery of the rectangular rod (2), and the sliding mechanism (43) is connected to the clamping frame (1) located on the right side; The moving mechanism (42) comprises a moving rod (421) slidably connected in the sliding groove (41), the moving rod (421) is detachably connected to the sliding mechanism (43), a connecting strip (422) is installed at the right end of the moving rod (421), and the right end of the connecting strip (422) slides through the right end of the rectangular rod (2); The sliding mechanism (43) fine-adjusts the distance between the two clamping frames (1) and limits the position; the moving mechanism (42) further comprises a plurality of limiting holes (423) which are arranged at the upper end of the moving rod (421) and are evenly distributed from left to right; a cylindrical groove (424) is arranged on the left groove wall of the sliding groove (41); a connecting spring (425) is installed between the vertical side wall of the cylindrical groove (424) and the left end of the moving rod (421); A clamping device (5) connected to the right end of the rectangular rod (2), the clamping device (5) comprising a holding mechanism (51) for pushing the connecting strip (422) to move and a limiting mechanism (52) for limiting the position of the holding mechanism (51); The holding mechanism (51) comprises a holding frame (511) hinged on the right end of the rectangular rod (2); the holding frame (511) is a U-shaped structure with its opening facing forward; a spring telescopic rod (512) is hinged between the inner end of the vertical section of the holding frame (511) and the right end of the connecting strip (422); The limiting mechanism (52) comprises a strip plate (521) mounted on the right end of the rectangular rod (2); a connecting block (522) is mounted on the right end of the rectangular rod (2); and a limiting sleeve (523) is provided on the outer peripheral sliding sleeve of the connecting block (522); A rectangular plate (6) is installed at the front end of each of the two clamping frames (1), and a distance measuring module (7) is installed on the rectangular plate (6) located on the left side.

2. The instrument for measuring the degree of degradation of windbreak and sand-fixing forests according to claim 1, characterized in that: The distance adjustment device (3) comprises a guide rod (31) mounted on the left end of the rectangular rod (2); a sliding frame (32) is slidably sleeved on the guide rod (31); the upper end of the sliding frame (32) is fixedly connected to the clamping frame (1) located on the left; a plurality of positioning through holes (33) evenly distributed from left to right are formed on the guide rod (31); a positioning screw (34) is threadedly connected to the bottom wall of the sliding frame (32) near the right end; the positioning screw (34) is plugged into and matched with any one of the positioning through holes (33).

3. The instrument for measuring the degree of degradation of windbreak and sand-fixing forests according to claim 1, characterized in that: The sliding mechanism (43) comprises a U-shaped frame (431) with an opening facing toward the outside and slidingly connected to the outer periphery of the rectangular rod (2); a fixing plate (432) is installed at the upper end of the U-shaped frame (431); the fixing plate (432) is fixedly connected to the clamping frame (1) located on the right side; a U-shaped rod (433) with an opening facing downward is plugged into the fixing plate (432); and the lower end of the U-shaped rod (433) is plugged into and matched with any two adjacent limiting holes (423).

4. The instrument for measuring the degree of degradation of windbreak and sand-fixing forests according to claim 1, characterized in that: A plurality of cylindrical rods (12) evenly distributed from front to back are mounted on the oblique side section of the clamping frame (1), and the cylindrical rods (12) are in a vertical state.

5. A method for measuring the degree of degradation of windbreak and sand-fixing forests, characterized in that: The method is completed by using a measuring instrument as described in any one of claims 1 to 4, comprising the following steps: S1: Before measuring, the distance adjusting device (3) is adjusted according to the approximate diameter of the trees on the land to be measured, and the distance adjusting device (3) changes the distance between the two clamping frames (1); S2: Then, the position of the corresponding clamping frame (1) on the moving mechanism (42) is adjusted, thereby fine-tuning the distance between the two clamping frames (1); S3: The surveyor holds the rectangular rod (2) and moves to the front of the tree to be measured, and then moves the rectangular rod (2) toward the tree trunk. The rectangular rod (2) drives the two clamping frames (1) to move to both sides of the tree trunk through the distance adjustment device (3) and the adjustment device (4); S4: The measurement personnel holds the holding mechanism (51), and the holding mechanism (51) drives the moving mechanism (42) to move, thereby driving the corresponding clamping frame (1) to move toward the tree trunk and ensuring that the two clamping frames (1) clamp the tree trunk; S5: Start the distance measuring module (7), which cooperates with the rectangular plate (6) on the other side to obtain the measurement result, then release the grip of the gripping mechanism (51), and then separate the two clamping frames (1) from the tree trunk, and the measurement is completed.

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