A sampling rake for evaluating submerged vegetation coverage and biomass and its application

Abstract

The present invention discloses a sampling rake for evaluating the coverage and biomass of submerged vegetation and its application. The sampling rake comprises a sampling rod, a sampler, a first blade, a first linkage structure, a second blade and a second linkage structure. The first blade is movably arranged under the second target surface of one of the samplers, and has a first state hidden on the second target surface and a second state moved to the rake tooth position to cut the submerged vegetation; the first linkage structure is transmission-connected between one of the sampling rods and the second target surface, and the first blade is driven to switch from the first state to the second state through the first linkage structure; the second blade is arranged under the second target surface of another sampler, and the second blade can rotate around the central axis of the rake rod of the other sampler as a rotation axis. The sampling rake provided by the present invention realizes collection for different submerged vegetation and can accurately evaluate the coverage and biomass of the submerged vegetation at the sampling point.

Description

Technical Field

[0001] The invention relates to the technical field of water ecological environment investigation, and in particular to a sampling rake for evaluating submerged vegetation coverage and biomass and an application thereof. Background Art

[0002] Submerged vegetation, that is, aquatic vegetation that grows at the bottom of water bodies and anchors the soil with roots and whose stems and leaves extend to the water surface or underwater, is an important component of aquatic ecosystems. As a key component of aquatic ecosystems, submerged vegetation has multiple ecological functions. It can effectively increase spatial niches, increase environmental heterogeneity, provide shelter and spawning sites and bait for some animals, provide attachment substrates for some organisms, purify water quality, and inhibit the occurrence of algal blooms. It is the basis for maintaining aquatic biodiversity and an important part of a healthy aquatic ecosystem. Therefore, studying and collecting submerged vegetation has important scientific and practical significance. Through scientific collection techniques, we can better understand and monitor the current status and changes of submerged vegetation, and provide data support for the protection and restoration of aquatic ecology.

[0003] Submerged vegetation coverage and biomass are one of the important indicators for the evaluation and assessment of water ecological health of water bodies. At present, the main means of obtaining this indicator is to set sample points in the water body, and then use specific sampling tools to quantitatively collect submerged vegetation at the set sample points, and finally infer the overall situation from the samples. For example, a Chinese invention patent (CN 116413071 A) discloses a large aquatic vegetation sampling rake, which consists of a U-shaped mounting frame and arc-shaped rake teeth. The invention improves the efficiency of collecting aquatic vegetation. Although sampling is convenient, it may be difficult to collect perennial submerged vegetation. Therefore, how to use simple sampling tools to conveniently and quickly sample submerged vegetation in different growth conditions, and quickly and accurately determine the coverage and biomass of submerged vegetation is a problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the present invention is to provide a sampling rake for evaluating the coverage and biomass of submerged vegetation, aiming to be able to conveniently and quickly sample submerged vegetation in different growth conditions and quickly and accurately determine the coverage and biomass of submerged vegetation.

[0005] To achieve the above object, the present invention proposes a sampling rake for evaluating submerged vegetation coverage and biomass, comprising:

[0006] Sampling rods, wherein there are two sampling rods;

[0007] Samplers, there are two samplers, each of which comprises a rake rod, a first rake surface, a second target surface and rake teeth, the upper end of the rake rod is detachably connected to the lower end of the sampling rod, and the middle parts of the two rake rods are cross-connected;

[0008] A first blade, the first blade being movably disposed under the second target surface of one of the samplers, and having a first state of being hidden on the second target surface and a second state of being moved to the rake teeth position and capable of cutting submerged vegetation;

[0009] A first linkage structure, wherein the first linkage structure is transmission-connected between one of the sampling rods and the second target surface, and the first blade is driven to switch from the first state to the second state through the first linkage structure;

[0010] a second blade, the second blade being arranged below the second target surface of the other sampler, the second blade being capable of rotating around the central axis of the rake rod of the other sampler as a rotation axis to cut submerged vegetation; and

[0011] The second linkage structure is transmission-connected between another sampling rod and the second target surface, and the second linkage structure drives the second blade to rotate around the central axis of another rake rod of the sampler as the rotation axis.

[0012] Preferably, the rake teeth are provided in two groups, including a first group and a second group, each group of the rake teeth is provided in two sets corresponding to the two sampling rods, each set of the rake teeth is detachably connected to the second rake surface, and one of the groups is installed according to the sparseness of the vegetation;

[0013] The first group of rake teeth includes first coarse rake teeth and first through holes, the first coarse rake teeth are provided in plurality, the cross section of the first coarse rake teeth is sawtooth-shaped, the vertical outer cross section of the first coarse rake teeth is wavy or sawtooth-shaped, and rake holes are formed between the plurality of the first coarse rake teeth;

[0014] The second group of rake teeth includes second coarse rake teeth, micro rake teeth, and second through holes. The second coarse rake teeth and micro rake teeth are both provided in plurality. The second coarse rake teeth are in the shape of long strips. Rake holes are formed between the plurality of the second coarse rake teeth. The micro rake teeth are provided between the rake holes.

[0015] Preferably, the first linkage structure includes a first fixed shell, a first button, a first pressing rod, a first rotating shaft, a first rotating rod, a first elastic member, a second elastic member, a linkage rod, a second rotating shaft and a push rod. The first fixed shell is fixedly arranged on one of the sampling rods. A first opening is arranged at the lower end of the first fixed shell, and the diameter of the first opening is larger than the diameter of the linkage rod. A second opening is arranged on the side wall of the first fixed shell. One end of the first button passes through the second opening. One end of the first elastic member is fixed to one side of the first pressing rod, and the other end of the first elastic member abuts against the first fixed shell. The first pressing rod is connected to the first rotating rod through the first rotating shaft and can rotate around the first rotating shaft at the same time. One end of the second elastic member is fixedly connected to the lower part of the first rotating rod, and the other end of the second elastic member is connected to one end of the linkage rod. The other end of the linkage rod is connected to the push rod through the second rotating shaft. When the first button is pressed, the first pressing rod rotates to the left, driving the first rotating rod to rotate and compressing the second elastic member. The second elastic member pushes the transmission rod to move downward, pushes the end of the push rod to move forward, and the push rod pushes the first blade to move forward.

[0016] Preferably, the push rod is hinged to the first blade, and a slideway is provided on the second target surface. One end of the push rod hinged to the first blade can slide in the slideway to push the second blade to move.

[0017] Preferably, the second linkage structure includes a second fixed shell, a second button, a second pressing rod, a third rotating shaft, a second rotating rod, a third elastic member, a fourth elastic member, a screw rod, a spiral sleeve, a clamping ring, a connecting rod, and a hollow tube, the lower end of the hollow tube is fixedly connected to the connecting rod, the lower end of the connecting rod is fixedly connected to the second blade, the second fixed shell is fixedly arranged on the other of the sampling rods, the lower end of the second fixed shell is provided with a third opening, the diameter of the third opening is larger than the diameter of the screw rod, the side wall of the second fixed shell is provided with a fourth opening, one end of the second button passes through the fourth opening, one end of the third elastic member is fixed to one side of the second pressing rod, the other end of the third elastic member abuts against the second fixed shell, and the second pressing rod The second rotating rod is connected by a third rotating shaft and can rotate around the third rotating shaft at the same time. One end of the fourth elastic member is fixedly connected to the lower part of the second rotating rod, and the other end of the fourth elastic member is connected to one end of the screw rod. The inner side wall of the spiral sleeve is provided with a spiral pattern matching the screw rod, and the lower end of the spiral sleeve is provided with an upper clamping tooth, and the upper end of the clamping ring is provided with a lower clamping tooth engaged with the upper clamping tooth. By pressing the second button to press down the screw rod, the screw rod drives the spiral sleeve to move downward and engage with the clamping ring. Continuing to press the second button to press down the screw rod, the screw rod can make the spiral sleeve and the clamping ring drive the hollow tube and the second blade to rotate with the central axis of the hollow tube as the rotation axis, and the second blade rotates accordingly to cut submerged vegetation.

[0018] Preferably, the sampling rake further comprises a handle, wherein there are two handles, and the outer surfaces of the handles are provided with anti-slip patterns.

[0019] Preferably, the sampling rake further comprises an extension rod, the upper end of the extension rod is detachably connected to the upper end of the sampling rod, and the lower end of the extension rod is detachably connected to the upper end of the sampler.

[0020] Preferably, the extension rod is connected to the sampling rod via threads;

[0021] The extension rod is connected to the sampler via threads.

[0022] The present invention also proposes an application of the sampling rake as described above for evaluating the coverage and biomass of submerged vegetation.

[0023] Preferably, the application comprises the following steps:

[0024] A. Connect the sampling rake. Depending on the depth of the water body to be sampled, you can connect or not connect the extension rod;

[0025] B. In the designed submerged vegetation plot, open the connected sampling rake to the maximum opening, vertically into the water, and multiple rake holes form multiple rake sample belts on the bottom of the water;

[0026] C. Repeat the above steps until submerged vegetation is randomly collected multiple times to form a total rake sample strip at the bottom of the water;

[0027] D. In each sample plot, calculate the total number of harrow holes where submerged vegetation was collected, that is, the total number of harrow transects where submerged vegetation was distributed in multiple harrow transects;

[0028] E. Calculate the percentage of the harrow transects that collected submerged vegetation in the sample plot of each sampling point to the total harrow transects, and obtain the coverage of submerged vegetation at the sampling point;

[0029] F. Weigh the biomass of submerged vegetation in the rake transect where submerged vegetation is collected in each sampling point, and divide it by the total rake transect area in the sample plot where each sampling point is located to obtain the biomass data of submerged vegetation per unit area at the sampling point;

[0030] G. Record the latitude and longitude information of all sampling points and the corresponding submerged vegetation coverage and biomass data, and use the spatial interpolation method to obtain the submerged vegetation coverage and biomass per unit area of ​​the entire lake;

[0031] Among them, in steps B and C, when collecting submerged vegetation, first use the rake teeth of the sampler to clamp the submerged vegetation, and then pull up to move the submerged vegetation out of the water surface. When the submerged vegetation is difficult to pull off and cannot be moved out of the water surface, press the first button to move the first blade to the rake tooth position to cut the submerged vegetation. When the first blade is difficult to cut, press the second button again to rotate the second blade to cut the submerged vegetation. By moving the submerged vegetation out of the water surface in three different ways, the growth of the submerged vegetation can be preliminarily judged, thereby judging the imbalance of the water ecosystem of the lake.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] (1) The sampling rake for evaluating the coverage and biomass of submerged vegetation provided by the present invention is assembled through a sampling rod, a sampler, a first blade, a first linkage structure, a second blade, and a second linkage structure. By setting the first linkage structure, the flexible movement of the first blade is realized. When it is necessary to cut the submerged vegetation, the first linkage structure can be started to achieve it, which is convenient and quick. By setting the second linkage structure, when the submerged vegetation is relatively large and the rhizomes are relatively thick and tough, and the first blade is difficult to cut or difficult to fully collect, the second linkage structure is started to achieve the rotational cutting of the second blade. Through the coordinated use of the two linkage structures, it is possible to cut submerged vegetation according to different growth conditions and different types, thereby facilitating the collection of submerged vegetation.

[0034] (2) The sampling rake provided by the present invention is simple and easy to use. When collecting submerged vegetation, different methods can be used for collecting submerged vegetation according to different growth conditions and different types. Submerged vegetation can be collected quickly and fully, and the coverage and biomass of submerged vegetation at the sample point can be determined, thereby reflecting the health status of the water ecology of the water body and taking effective management methods.

[0035] (3) The sampling rake provided by the present invention is suitable for different water bodies and can accurately evaluate the coverage and biomass of submerged vegetation. The sampling process can reduce labor loss. A hollow extension rod is designed when preparing the sampling rake. The extension rod, blade and linkage structure can be flexibly connected according to the depth of the water body. This design solves the applicability problem when sampling different water bodies and different types of submerged vegetation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of an embodiment of a sampling rake for evaluating submerged vegetation coverage and biomass according to the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the first linkage structure of the middle sampling rake;

[0039] Figure 3 for Figure 1 Schematic diagram of the second linkage structure of the middle sampling rake;

[0040] Figure 4 for Figure 1 Schematic diagram of the structure of the first set of rake teeth of the middle sampling rake;

[0041] Figure 5 for Figure 1 Schematic diagram of the structure of the second set of rake teeth of the middle sampling rake.

[0042] Description of Figure Numbers:

[0043]

[0044]

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] In view of the fact that existing sampling tools cannot conveniently and quickly sample submerged vegetation in different growth conditions, the present invention proposes a sampling rake for evaluating the coverage and biomass of submerged vegetation, referring to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of an embodiment of a sampling rake for evaluating submerged vegetation coverage and biomass according to the present invention;

[0050] Figure 2 for Figure 1 Schematic diagram of the first linkage structure of the middle sampling rake; Figure 3 for Figure 1 Schematic diagram of the second linkage structure of the sampling rake. The sampling rake for evaluating the coverage and biomass of submerged vegetation will be described in detail below in conjunction with the accompanying drawings; Figure 4 for Figure 1 Schematic diagram of the structure of the first set of rake teeth of the middle sampling rake; Figure 5 for Figure 1 Schematic diagram of the structure of the second set of rake teeth of the middle sampling rake.

[0051] In the embodiment of the present invention, Figure 1 Figure 3As shown, the sampling rake for evaluating submerged vegetation coverage and biomass includes a sampling rod 1, a sampler 2, a first blade 3, a first linkage structure 4, a second blade 5 and a second linkage structure 6, wherein the sampling rods 1 are two; the samplers 2 are two, each of the samplers 2 includes a rake rod 21, a first rake surface 22, a second target surface 23 and rake teeth 24, the upper end of the rake rod 21 is detachably connected to the lower end of the sampling rod 1, and the middle parts of the two rake rods 21 are cross-connected; the first blade 3 is movably arranged under the second target surface 23 of one of the samplers 2, and has a first state hidden on the second target surface 23 and a first state moved to the rake teeth 24 to cut the submerged vegetation. The second state of the vegetation; the first linkage structure 4 is transmission-connected between one of the sampling rods 1 and the second target surface 23, and the first linkage structure 4 drives the first blade 3 to switch from the first state to the second state; the second blade 5 is arranged below the second target surface 23 of the other sampler 2, and the second blade 5 can rotate around the central axis of the rake rod 21 of the other sampler 2 as the rotation axis to cut submerged vegetation; the second linkage structure 6 is transmission-connected between the other sampling rod 1 and the second target surface 23, and the second blade 5 is driven by the second linkage structure 6 to rotate around the central axis of the rake rod 21 of the other sampler 2 as the rotation axis.

[0052] The sampling rake provided by the present invention includes a sampling rod 1, a sampler 2, a first blade 3, a first linkage structure 4, a second blade 5, and a second linkage structure 6. By setting the first linkage structure 4, flexible movement of the first blade 3 is achieved. When it is necessary to cut submerged vegetation, the first linkage structure 4 can be started to achieve the desired effect, which is convenient and quick. By setting the second linkage structure 6, when the submerged vegetation is relatively abundant and the rhizomes are relatively thick and tough, and the first blade 3 is difficult to cut, the second linkage structure 6 is started to achieve rotational cutting of the second blade 5. By using the two linkage structures in coordination, submerged vegetation in different growth conditions can be cut, thereby facilitating the collection of submerged vegetation.

[0053] For further information, please refer to Figure 4 and Figure 5The rake teeth 24 are provided in two groups, including a first group and a second group. Each group of the rake teeth 24 is provided in two sets corresponding to the two sampling rods. One end of each set of the rake teeth 24 is detachably connected to the second rake surface 23, and one of the groups is installed according to the sparseness of the vegetation. When collecting relatively sparse submerged vegetation, the first group of rake teeth 24 is used. The first group of rake teeth 24 includes first coarse rake teeth 241 and first through holes 242. The first coarse rake teeth 241 are provided in plurality. The cross section of the first coarse rake teeth 241 is sawtooth-shaped. The vertical outer cross section of the first coarse rake teeth 241 is wavy or sawtooth-shaped. shape, rake holes are formed between the plurality of the first coarse rake teeth 241, two first through holes 242 are provided, which are located at both ends of the first group of rake teeth 24, and screws are passed through the first through holes 242 to connect the first group of rake teeth 24 with the second target surface 23. By providing a plurality of serrated first coarse rake teeth 241, the rake holes between the first coarse rake teeth 241 form a rake sample belt on the bottom of the water, which is convenient for collecting information such as the coverage and biomass of submerged vegetation. At the same time, the vertical outer cross-section of each of the first coarse rake teeth 241 is set to be wavy or serrated, which can increase friction and facilitate pulling the submerged vegetation out of the water. When collecting relatively dense submerged vegetation, a second group of rake teeth 24 is used. The second group of rake teeth 24 includes second coarse rake teeth 243, micro rake teeth 244, and second through holes 245. The second coarse rake teeth 243 and micro rake teeth 244 are both provided in plurality. The second coarse rake teeth 243 are in the shape of long strips, and rake holes are formed between the plurality of the second coarse rake teeth 243. The micro rake teeth 244 are provided between the rake holes. The friction force can be increased by providing the micro rake teeth 244 between the second coarse rake teeth 243, and the cooperation between the second coarse rake teeth 243 and the micro rake teeth 244 facilitates the collection of sufficient submerged vegetation out of the water. By providing two groups of different rake teeth, different rake teeth can be flexibly selected according to the density of the growth of submerged vegetation, making it more convenient to collect submerged vegetation.

[0054] Please refer to Figure 2Preferably, the first linkage structure 4 includes a first fixed shell 401, a first button 402, a first pressing rod 403, a first rotating shaft 404, a first rotating rod 405, a first elastic member 406, a second elastic member 407, a linkage rod 408, a second rotating shaft 409 and a push rod 410, the first fixed shell 401 is fixedly arranged on one of the sampling rods 1, a first opening is arranged at the lower end of the first fixed shell 401, the diameter of the first opening is larger than the diameter of the linkage rod 408, a second opening is arranged on the side wall of the first fixed shell 401, one end of the first button 402 passes through the second opening, one end of the first elastic member 406 is fixed to one side of the first pressing rod 403, and the other end of the first elastic member 406 abuts against the first fixed The fixed housing 401, the first pressing rod 403 and the first rotating rod 405 are connected through the first rotating shaft 404, and can rotate around the first rotating shaft 404 at the same time, one end of the second elastic member 407 is fixedly connected to the lower part of the first rotating rod 405, the other end of the second elastic member 407 is connected to one end of the linkage rod 408, and the other end of the linkage rod 408 is connected to the push rod 410 through the second rotating shaft, the first button 402 is pressed, the first pressing rod 403 rotates to the left, driving the first rotating rod 405 to rotate, compressing the second elastic member 407, the second elastic member 407 pushes the transmission rod to move downward, pushes the end of the push rod 410 to move forward, and the push rod 410 pushes the first blade 3 to move forward. The first elastic member 406 and the second elastic member 407 are objects with elastic force, preferably springs, which are not limited in the present invention. When the first button 402 is pressed, the first elastic member 406 is compressed, and the first pressing rod 403 rotates around the first rotating shaft 404, thereby squeezing the second elastic member 407, and the second elastic member 407 pushes the connecting rod 408 to move downward. Since the push rod 410 is connected to the connecting rod 408 through the second rotating shaft 409, when the connecting rod 408 moves downward, the upper end of the push rod 410 moves downward while the lower end of the push rod 410 moves forward, thereby cutting submerged vegetation; when the first button 402 is released, the rebound force of the first elastic member 406 causes the first pressing rod 403 to rotate right, and the second spring returns to its natural state. The left end of the first rotating rod 405 is stuck in the groove of the first fixed shell 401, and the push rod 410 drives the first blade 3 back to the first state hidden on the second target surface 23.

[0055] For further information, please refer to Figure 2The push rod 410 is hinged to the first blade 3, and preferably the first blade 3 is connected to the first blade 3 via a pin, and the pin movably sets the second blade 5 on the second target surface 23. A slide is provided on the second target surface 23. When the upper end of the push rod 410 moves downward, the end of the push rod 410 hinged to the first blade 3 can slide in the slide to push the second blade 5 to move, thereby cutting submerged vegetation.

[0056] To facilitate the cutting of relatively old submerged vegetation, please refer to Figure 3 The second linkage structure 6 includes a second fixed shell 601, a second button 602, a second pressing rod 603, a third rotating shaft 604, a second rotating rod 605, a third elastic member 606, a fourth elastic member 607, a screw rod 608, a spiral sleeve 609, a snap ring 610, a connecting rod 611, and a hollow tube 612. The lower end of the hollow tube 612 is fixedly connected to the connecting rod 611. The lower end of the connecting rod 611 is fixedly connected to the second blade 5. The second fixed shell 601 is fixedly arranged on another sampling rod 1. The lower end of the second fixed shell 601 is provided with a third opening. The diameter of the third opening is larger than the diameter of the screw rod 608. The side wall of the second fixed shell 601 is provided with a fourth opening. One end of the second button 602 passes through the fourth opening. One end of the third elastic member 606 is fixed to one side of the second pressing rod 603. The other end of the third elastic member 606 abuts against the second fixed shell 601. 3 is connected to the second rotating rod 605 through the third rotating shaft 604 and can rotate around the third rotating shaft 604 at the same time, one end of the fourth elastic member 607 is fixedly connected to the lower part of the second rotating rod 605, and the other end of the fourth elastic member 607 is connected to one end of the screw rod 608, the inner side wall of the spiral sleeve 609 is provided with a spiral pattern matching the screw rod 608, the lower end of the spiral sleeve 609 is provided with an upper clamping tooth, and the upper end of the clamping ring 610 is provided with a The lower teeth mesh with the upper teeth, and the screw rod 608 is pressed down by pressing the second button 602. The screw rod 608 drives the spiral sleeve 609 to move downward and mesh with the retaining ring 610. The second button 602 is continued to be pressed down to press the screw rod 608. The screw rod 608 can make the spiral sleeve 609 and the retaining ring 610 drive the hollow tube 612 and the second blade 5 to rotate with the central axis of the hollow tube 612 as the rotation axis, and the second blade 5 rotates accordingly to cut the submerged vegetation.

[0057] Preferably, please refer to Figure 1 The sampling rake also includes a handle 7, and there are two handles 7. The handle 7 is sleeved on the upper end of the sampling rod 1. The outer surface of the handle 7 is provided with anti-slip grooves. The handle 7 is made of rubber or silicone and has elastic and anti-slip functions.

[0058] Furthermore, the sampling rake also includes an extension rod 8, the upper end of the extension rod 8 is detachably connected to the upper end of the sampling rod 1, and the lower end of the extension rod 8 is detachably connected to the upper end of the sampler 2. The extension rod 8 is a hollow design. By designing a hollow extension rod 8, the extension rod 8 can be flexibly connected according to the depth of the water body. This design solves the applicability problem when monitoring and sampling the submerged vegetation coverage of different water bodies.

[0059] Please refer to Figure 1 Furthermore, the sampling rod 1 is connected to the extension rod 8 by threads, the outer diameter of the sampling rod 1 is 1.0-3.5 cm, the outer diameter of the extension rod 8 is 1.0-3.5 cm, the upper end of the sampling rod 12 is an external thread with a diameter of 1.0-3.5 cm, and the lower end is an internal thread with a diameter of 0.8-3.3 cm. The upper end of the extension rod 8 is provided with an external thread matching the internal thread of the lower end of the sampling rod 1, the diameter of the internal thread of the extension rod 8 is 0.8-3.3 cm, and the diameter of the lower end of the sampling rod 12 is equal to that of the upper end of the extension rod 83 to facilitate threaded connection.

[0060] Preferably, please refer to Figure 1 The rake rod 21 is connected to the extension rod 8 by threads. The length of the rake rod 21 is 0.3-1.5m. The upper end of the rake rod 21 is an external thread with an outer diameter of 1.0-3.5cm. The lower end of the extension rod 8 is provided with an internal thread matching the upper external thread of the rake rod 21. The diameter of the internal thread is 0.8-3.3cm. The diameter of the lower end of the extension rod 8 is equal to that of the upper end of the rake rod 21 to facilitate threaded connection.

[0061] The present invention also proposes an application of a sampling rake for evaluating submerged vegetation coverage and biomass, the application adopts a sampling rake for evaluating submerged vegetation coverage and biomass, the specific structure of the sampling rake for evaluating submerged vegetation coverage and biomass refers to the above embodiment, since the application adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one. The application comprises the following steps:

[0062] A. Connect the sampling rake and, depending on the depth of the sampling water body, connect or not connect the extension rod 8;

[0063] B. In the designed submerged vegetation plot, open the connected sampling rake to the maximum opening, vertically into the water, and multiple rake holes form multiple rake sample belts on the bottom of the water;

[0064] C. Repeat the above steps until submerged vegetation is randomly collected multiple times to form a total rake sample strip at the bottom of the water;

[0065] D. In each sample plot, calculate the total number of harrow holes where submerged vegetation was collected, that is, the total number of harrow transects where submerged vegetation was distributed in multiple harrow transects;

[0066] E. Calculate the percentage of the harrow transects that collected submerged vegetation in the sample plot of each sampling point to the total harrow transects, and obtain the coverage of submerged vegetation at the sampling point;

[0067] F. Weigh the biomass of submerged vegetation in the rake transect where submerged vegetation is collected in each sampling point, and divide it by the total rake transect area in the sample plot where each sampling point is located to obtain the biomass data of submerged vegetation per unit area at the sampling point;

[0068] G. Record the latitude and longitude information of all sampling points and the corresponding submerged vegetation coverage and biomass data, and use the spatial interpolation method to obtain the submerged vegetation coverage and biomass per unit area of ​​the entire lake;

[0069] Among them, in steps B and C, when collecting submerged vegetation, the rake teeth 24 of the sampler 2 are first used to clamp the submerged vegetation, and then pulled upward to move the submerged vegetation out of the water surface. When the submerged vegetation is difficult to pull off and cannot be moved out of the water surface, the first button 402 is pressed to move the first blade 3 to the rake teeth 24 to cut the submerged vegetation. When the first blade 3 is difficult to cut, the second button 602 is pressed again to rotate the second blade 5 to cut the submerged vegetation. By moving the submerged vegetation out of the water surface in three different ways, the growth of the submerged vegetation can be preliminarily judged, thereby judging the imbalance of the water ecosystem of the lake.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sampling rake for evaluating submerged vegetation coverage and biomass, characterized in that: include: Sampling rods (1), wherein the number of the sampling rods (1) is two; A sampler (2), wherein there are two samplers (2), each of the samplers (2) comprises a rake rod (21), a first rake surface (22), a second rake surface (23) and rake teeth (24), the upper end of the rake rod (21) is detachably connected to the lower end of the sampling rod (1), and the middle parts of the two rake rods (21) are cross-connected; A first blade (3), the first blade (3) being movably arranged under a second rake surface (23) of one of the samplers (2), and having a first state in which the first blade (3) is hidden on the second rake surface (23) and a second state in which the first blade (3) is moved to the position of the rake teeth (24) and is capable of cutting submerged vegetation; A first linkage structure (4), the first linkage structure (4) being transmission-connected between one of the sampling rods (1) and the second rake surface (23), and driving the first blade (3) to switch from the first state to the second state through the first linkage structure (4); a second blade (5), the second blade (5) being arranged below a second rake surface (23) of another sampler (2), the second blade (5) being capable of rotating around a central axis of a rake rod (21) of another sampler (2) as a rotation axis to cut submerged vegetation; and A second linkage structure (6), the second linkage structure (6) is transmission-connected between another sampling rod (1) and the second rake surface (23), and the second blade (5) is driven by the second linkage structure (6) to rotate around the central axis of the rake rod (21) of another sampler (2) as a rotation axis; The rake teeth (24) are provided in two groups, including a first group and a second group. Each group of the rake teeth (24) is provided in two sets corresponding to the two sampling rods. Each set of the rake teeth (24) is detachably connected to the second rake surface (23), and one of the groups is installed according to the sparseness of the vegetation. The first group of rake teeth (24) comprises first coarse rake teeth (241) and first through holes (242); the first coarse rake teeth (241) are provided in plurality; the cross section of the first coarse rake teeth (241) is sawtooth-shaped; the vertical outer cross section of the first coarse rake teeth (241) is wavy or sawtooth-shaped; and rake holes are formed between the plurality of the first coarse rake teeth (241); The second group of rake teeth (24) comprises second coarse rake teeth (243), micro rake teeth (244), and second through holes (245); the second coarse rake teeth (243) and the micro rake teeth (244) are both provided in plurality; the second coarse rake teeth (243) are in the shape of long strips; rake holes are formed between the plurality of the second coarse rake teeth (243); and the micro rake teeth (244) are provided between the rake holes; The first linkage structure (4) comprises a first fixed shell (401), a first button (402), a first pressing rod (403), a first rotating shaft (404), a first rotating rod (405), a first elastic member (406), a second elastic member (407), a linkage rod (408), a second rotating shaft (409) and a push rod (410); the first fixed shell (401) is fixedly arranged on one of the sampling rods (1); a first opening is arranged at the lower end of the first fixed shell (401); the diameter of the first opening is larger than the diameter of the linkage rod (408); a second opening is arranged on the side wall of the first fixed shell (401); one end of the first button (402) passes through the second opening; one end of the first elastic member (406) is fixed to one side of the first pressing rod (403); the other end of the first elastic member (406) abuts against the first fixed shell (401); , the first pressing rod (403) is connected to the first rotating rod (405) through a first rotating shaft (404), and can rotate around the first rotating shaft (404) at the same time, one end of the second elastic member (407) is fixedly connected to the lower part of the first rotating rod (405), the other end of the second elastic member (407) is connected to one end of the connecting rod (408), and the other end of the connecting rod (408) is connected to the push rod (410) through a second rotating shaft (409), and the first button (402) is pressed, and the first pressing rod (403) rotates to the left, driving the first rotating rod (405) to rotate, compressing the second elastic member (407), and the second elastic member (407) pushes the connecting rod (408) to move downward, pushing the end of the push rod (410) to move forward, and the push rod (410) pushes the first blade (3) to move forward; The second linkage structure (6) comprises a second fixed shell (601), a second button (602), a second pressing rod (603), a third rotating shaft (604), a second rotating rod (605), a third elastic member (606), a fourth elastic member (607), a screw rod (608), a spiral sleeve (609), a snap ring (610), a connecting rod (611), and a hollow tube (612), wherein the lower end of the hollow tube (612) is fixedly connected to the connecting rod (611), and the lower end of the connecting rod (611) is fixedly connected to the second blade (5). The second fixed shell (601) is fixedly arranged on the other sampling rod (1), a third opening is arranged at the lower end of the second fixed shell (601), the diameter of the third opening is larger than the diameter of the screw rod (608), a fourth opening is arranged on the side wall of the second fixed shell (601), one end of the second button (602) passes through the fourth opening, one end of the third elastic member (606) is fixed to one side of the second pressing rod (603), the other end of the third elastic member (606) abuts against the second fixed shell (601), and the second pressing rod ( The fourth elastic member (607) is connected to the lower part of the second rotating rod (605) through the third rotating shaft (604), and can rotate around the third rotating shaft (604) at the same time. One end of the fourth elastic member (607) is fixedly connected to the lower part of the second rotating rod (605), and the other end of the fourth elastic member (607) is connected to one end of the screw rod (608). The inner side wall of the spiral sleeve (609) is provided with a spiral pattern matching the screw rod (608). The lower end of the spiral sleeve (609) is provided with an upper clamping tooth, and the upper end of the clamping ring (610) is provided with a clamping tooth matching the upper clamping tooth. The lower locking teeth are meshed with each other, and the screw rod (608) is pressed down by pressing the second button (602), and the screw rod (608) drives the spiral sleeve (609) to move downward and engage with the snap ring (610). The second button (602) is continued to be pressed down to press the screw rod (608), and the screw rod (608) can make the spiral sleeve (609) and the snap ring (610) drive the hollow tube (612) and the second blade (5) to rotate with the central axis of the hollow tube (612) as the rotation axis, and the second blade (5) rotates accordingly to cut the submerged vegetation.

2. The sampling rake for assessing submerged vegetation coverage and biomass as claimed in claim 1, characterized in that: The push rod (410) is hinged to the first blade (3), and a slideway is provided on the second raking surface (23). One end of the push rod (410) hinged to the first blade (3) can slide in the slideway to push the second blade (5) to move.

3. The sampling rake for assessing submerged vegetation coverage and biomass as claimed in claim 1, characterized in that: The sampling rake further comprises a handle (7), wherein the handle (7) is provided with two handles, and the outer surface of the handle (7) is provided with anti-slip grooves.

4. The sampling rake for assessing submerged vegetation coverage and biomass as claimed in claim 1, characterized in that: The sampling rake also includes an extension rod (8), the upper end of the extension rod (8) is detachably connected to the upper end of the sampling rod (1), and the lower end of the extension rod (8) is detachably connected to the upper end of the sampler (2).

5. The sampling rake for assessing submerged vegetation coverage and biomass as claimed in claim 4, characterized in that: The extension rod (8) is connected to the sampling rod (1) via a thread; the extension rod (8) is connected to the sampler (2) via a thread.

6. An application of a sampling rake for assessing submerged vegetation coverage and biomass as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: A. Connect the sampling rake and, depending on the depth of the water being sampled, connect or not connect the extension rod (8); B. In the designed submerged vegetation plot, open the connected sampling rake to the maximum opening, vertically into the water, and multiple rake holes form multiple rake sample belts on the bottom of the water; C. Repeat the above steps until submerged vegetation is randomly collected multiple times to form a total rake sample strip at the bottom of the water; D. In each sample plot, calculate the total number of harrow holes where submerged vegetation was collected, that is, the total number of harrow transects where submerged vegetation was distributed in multiple harrow transects; E. Calculate the percentage of the harrow transects that collected submerged vegetation in the sample plot of each sampling point to the total harrow transects, and obtain the coverage of submerged vegetation at the sampling point; F. Weigh the biomass of submerged vegetation in the rake transect where submerged vegetation is collected in each sampling point, and divide it by the total rake transect area in the sample plot where each sampling point is located to obtain the biomass data of submerged vegetation per unit area at the sampling point; G. Record the latitude and longitude information of all sampling points and the corresponding submerged vegetation coverage and biomass data, and use the spatial interpolation method to obtain the submerged vegetation coverage and biomass per unit area of ​​the entire lake; Among them, in steps B and C, when collecting submerged vegetation, the rake teeth (24) of the sampler (2) are first used to clamp the submerged vegetation, and then pulled upward to move the submerged vegetation out of the water surface. When the submerged vegetation is difficult to pull off and cannot be moved out of the water surface, the first button (402) is pressed to move the first blade (3) to the position of the rake teeth (24) to cut the submerged vegetation. When the first blade (3) is difficult to cut, the second button (602) is pressed again to rotate the second blade (5) to cut the submerged vegetation. By moving the submerged vegetation out of the water surface in three different ways, the growth of the submerged vegetation can be preliminarily judged, thereby judging the imbalance of the water ecosystem of the lake.

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