Sampling device for studying the control effect of ferns on soil phosphorus nutrient

Abstract

The present invention relates to the technical field of sampling devices, and specifically to a sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrients. The sampling device includes a workbench, on which a support frame for supporting is provided. An adjustment mechanism for adjusting the position of collecting water samples is provided on the support frame. A collection mechanism for dispersing garbage on the water surface when collecting water samples is provided on the adjustment mechanism. A driving mechanism for driving the collection mechanism to work and ensuring that the collected water samples are sufficient is provided on the adjustment mechanism. The purpose of the present invention is to provide a sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrients, which can adjust the position of collecting water samples according to the actual situation, avoid the river embankments in some sampling areas being too steep, resulting in the inability of staff to collect water samples. In addition, it can disperse the garbage when collecting water samples to avoid the garbage affecting the inspection results of the water samples.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and specifically to a sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrients. Background Art

[0002] At present, agricultural non-point source pollution prevention and control often uses plants to enrich nitrogen and phosphorus nutrients to purify water bodies. The total phosphorus removal rate of wetlands with plants is 60% - 65%, which is much higher than that of wetlands without plants (about 45%). As a special group of higher plants, fern plants are highly sensitive and strictly selective to the growth environment. The phosphorus content in their leaves is generally higher than that of other gymnosperms and angiosperms in the survey, and some can be used as indicator plants for phosphorus pools in subtropical acidic soils. Studying the absorption of soil phosphorus nutrients and the interception of water phosphorus by fern plants has important practical guiding significance for phosphorus interception and non-point source pollution prevention and control in the acidic soil environment of the southeastern hilly areas. Therefore, preferred fern plants are planted in the test area, and water samples are collected for experiments later. However, when collecting water samples at present, there are often some garbage floating in the river, and the staff generally directly use collection bottles to collect, resulting in the collected water samples being mixed and having a lot of garbage, and it is impossible to obtain ideal test samples, which affects the subsequent test results. Moreover, during the collection process, some river embankments are too steep, making it difficult for the staff to collect water samples. Therefore, it is particularly important to develop a sampling device for the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrients, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrients, including a workbench, a support frame for supporting is arranged on the workbench, an adjustment mechanism for adjusting the position of collecting water samples is arranged on the support frame, a collection mechanism for dispersing garbage on the water surface when collecting water samples is arranged on the adjustment mechanism, and a driving mechanism for driving the collection mechanism to work and ensuring that the collected water samples are sufficient is arranged on the adjustment mechanism.

[0005] Optionally, universal wheels for moving are arranged at the bottom of the workbench.

[0006] Optionally, two support frames are fixedly installed on the surface of the workbench, and the support frames are U-shaped.

[0007] Optionally, the adjusting mechanism includes a first hydraulic rod fixedly installed on the surface of the workbench, and a sliding plate fixedly installed at the output end of the first hydraulic rod. The sliding plate is located between two support frames and slides along the support frames at both ends. A second hydraulic rod is fixedly installed on the side of the sliding plate away from the output end of the first hydraulic rod, and a push plate is fixedly installed at the output end of the second hydraulic rod. The cross-section of the push plate is L-shaped.

[0008] Optionally, the driving mechanism includes a driving rod, the top of which is fixedly installed at the bottom of the push plate, and a driving seat is fixedly installed at the end of the driving rod away from the push plate.

[0009] Optionally, a limiting plate is embedded in the driving seat. A rotating rod is rotatably installed at one end of the driving rod close to the driving seat, and the rotating rod rotates inside the driving seat. At both ends inside the limiting plate, a first driving ring and a second driving ring are respectively rotatably installed, and the second driving ring is fixedly sleeved outside the rotating rod.

[0010] Optionally, the driving mechanism further includes a threaded rod and a moving plate. The moving plate is slidably installed on the surface of the workbench, and the threaded rod is fixedly installed on the surface of the moving plate. One end of the threaded rod away from the workbench penetrates and slidably connects with the push plate and the limiting plate. Threads are provided on the outer side of the threaded rod. The first driving ring is sleeved outside the threaded rod and is in screw connection with the threaded rod. A synchronous belt is installed on the first driving ring. The synchronous belt is located inside the limiting plate, and the other end of the synchronous belt is connected to the second driving ring.

[0011] Optionally, the driving mechanism further includes a connecting seat fixedly installed at the bottom of the end of the rotating rod penetrating the driving seat.

[0012] Optionally, the collecting mechanism includes a first outer shell and a second outer shell. The top of the second outer shell is fixedly connected to the connecting seat. Dispelling blades are fixedly installed at the bottoms of both the first outer shell and the second outer shell. A buckle is fixedly installed at the top of the first outer shell. A clamping groove is provided at one end of the connecting seat close to the first outer shell. The buckle is inserted into the clamping groove. A filter plate is fixedly installed at the bottom of the first outer shell. The outer side of the filter plate close to the first outer shell is movably and sealingly connected to the inner wall of the first outer shell.

[0013] Optionally, a clamping frame is fixedly installed at the bottom of the connecting seat. A mounting shaft is rotatably installed at one end of the clamping frame away from the connecting seat. A collecting bottle is rotatably installed through the surface of the mounting shaft. The collecting bottle is located inside the first outer shell and the second outer shell. A second magnet is fixedly installed on the outer side of the bottom of the collecting bottle, and a first magnet is fixedly installed on the inner wall of the second outer shell. The second magnet is movably adsorbed to the first magnet.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. When it is necessary to collect water samples, the first hydraulic rod can be activated. The output end of the first hydraulic rod can drive the sliding plate to move along the support frame to adjust the collection height. Then, the second hydraulic rod on the sliding plate is activated. The output end of the second hydraulic rod can drive the push plate to move, and the collection position can be adjusted. The position of collecting water samples can be adjusted according to the actual situation, avoiding the river embankment in some sampling areas being too steep, resulting in the inability of staff to collect water samples.

[0016] 2. When the push plate moves, the push plate will drive the driving rod to move. The driving rod drives the driving seat to move. The driving seat can drive the rotating rod and the limiting plate to move. The limiting plate drives the first driving ring to move. Since the first driving ring is in screw connection with the threaded rod, when the limiting plate drives the first driving ring to move along the threaded rod, the first driving ring rotates. At this time, the first driving ring drives the synchronous belt to work, and the synchronous belt drives the second driving ring to rotate. The second driving ring drives the rotating rod to rotate. The rotating rod can drive the connecting seat to rotate. The connecting seat can drive the first outer shell and the second outer shell to rotate. The first outer shell and the second outer shell drive the dispersing blades to rotate. The dispersing blades can disperse the garbage on the water surface, and the garbage can be dispersed when collecting water samples, avoiding the garbage affecting the inspection results of water samples.

[0017] 3. In addition, the filter plate can also filter out a part of the garbage. After the water sample enters the interior of the first outer shell and the second outer shell through the second magnet, the water sample will cause the collection bottle to rotate by buoyancy. The collection bottle rotates on the clamping frame through the mounting shaft. The second magnet at the bottom of the collection bottle adsorbs to the first magnet, thereby keeping the collection bottle tilted at a certain angle, facilitating the collection of water samples. After a certain amount of water samples are collected, the weight of the water samples will drive the collection bottle to rotate, causing the second magnet to cancel the adsorption connection with the first magnet, thereby avoiding insufficient water samples being collected. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrient in the present invention;

[0019] Figure 2 It is the first schematic diagram of the structure of the sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrient in the present invention;

[0020] Figure 3 It is the second schematic diagram of the structure of the sampling device for studying the prevention and control effect of fern plants on soil phosphorus nutrient in the present invention;

[0021] Figure 4The first partial cross-sectional view of the sampling device for studying the control effect of fern plants on soil phosphorus nutrients in the present invention;

[0022] Figure 5 The second partial cross-sectional view of the sampling device for studying the control effect of fern plants on soil phosphorus nutrients in the present invention;

[0023] Figure 6 The third partial cross-sectional view of the sampling device for studying the control effect of fern plants on soil phosphorus nutrients in the present invention;

[0024] Figure 7 The fourth partial cross-sectional view of the sampling device for studying the control effect of fern plants on soil phosphorus nutrients in the present invention.

[0025] In the figure: 1, workbench; 2, support frame; 3, adjustment mechanism; 31, first hydraulic rod; 32, slide plate; 33, second hydraulic rod; 34, push plate; 4, drive mechanism; 41, driving rod; 42, driving seat; 43, threaded rod; 44, connecting seat; 45, limiting plate; 46, first driving ring; 47, second driving ring; 48, synchronous belt; 49, rotating rod; 410, moving plate; 5, collection mechanism; 51, first outer shell; 52, second outer shell; 53, clamping frame; 54, mounting shaft; 55, dispersing leaf; 56, first magnet; 57, collection bottle; 58, second magnet; 59, buckle; 510, card slot; 511, filter plate. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing 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 construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0028] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Please refer to Figures 1 to 7 , the present invention provides a sampling device for studying the control effect of fern plants on soil phosphorus nutrients, including a workbench 1. A support frame 2 for supporting is arranged on the workbench 1. An adjusting mechanism 3 for adjusting the position of collecting water samples is arranged on the support frame 2. A collecting mechanism 5 for dispersing the garbage on the water surface when collecting water samples is arranged on the adjusting mechanism 3. A driving mechanism 4 for driving the collecting mechanism 5 to work and ensuring that the collected water samples are sufficient is arranged on the adjusting mechanism 3. The position of collecting water samples can be adjusted according to the actual situation through the adjusting mechanism 3, avoiding that the river embankments in some sampling areas are too steep, resulting in the inability of staff to collect water samples. The driving mechanism 4 drives the collecting mechanism 5 to work. The collecting mechanism 5 can not only disperse the garbage when collecting water samples, but also ensure that a sufficient amount of water samples are obtained. Thus, it can not only avoid the influence of garbage on the inspection results of water samples, but also ensure that the collected water samples are sufficient for experiments.

[0031] Such as Figure 2 shown, universal wheels for moving are arranged at the bottom of the workbench 1. Through the universal wheels arranged at the bottom of the workbench 1, it is convenient for staff to collect water samples in multiple collection areas.

[0032] Such as Figure 2 shown, two support frames 2 are fixedly installed on the surface of the workbench 1, and the support frames 2 are U-shaped.

[0033] Such as Figure 2 、 Figure 3As shown in the figure, the adjusting mechanism 3 includes a first hydraulic rod 31. The first hydraulic rod 31 is fixedly installed on the surface of the workbench 1, and a sliding plate 32 is fixedly installed at the output end of the first hydraulic rod 31. The sliding plate 32 is located between the two support frames 2, and both ends of the sliding plate 32 slide along the support frames 2 respectively. A second hydraulic rod 33 is fixedly installed on one side of the sliding plate 32 away from the output end of the first hydraulic rod 31, and a push plate 34 is fixedly installed at the output end of the second hydraulic rod 33. The cross-section of the push plate 34 is L-shaped. When it is necessary to collect water samples, the first hydraulic rod 31 can be started. The output end of the first hydraulic rod 31 can drive the sliding plate 32 to move along the support frame 2 to adjust the collection height. Then, the second hydraulic rod 33 on the sliding plate 32 is started, and the output end of the second hydraulic rod 33 can drive the push plate 34 to move, so as to adjust the collection position.

[0034] As Figure 2 , Figure 3 shown in the figure, the driving mechanism 4 includes a driving rod 41. The top of the driving rod 41 is fixedly installed at the bottom of the push plate 34. One end of the driving rod 41 away from the push plate 34 is fixedly installed with a driving seat 42. The driving rod 41 is fixedly connected to the push plate 34, and the driving seat 42 is fixedly connected to the driving rod 41, which can achieve a good stabilizing effect. At the same time, when the push plate 34 moves, the push plate 34 will drive the driving rod 41 to move, and the driving rod 41 drives the driving seat 42 to move.

[0035] As Figure 5 , Figure 6 shown in the figure, a limiting plate 45 is embedded in the driving seat 42. One end of the driving rod 41 close to the driving seat 42 is rotatably installed with a rotating rod 49. The rotating rod 49 rotates inside the driving seat 42. At both ends inside the limiting plate 45, a first driving ring 46 and a second driving ring 47 are respectively rotatably installed. The second driving ring 47 is fixedly sleeved on the outer side of the rotating rod 49. While the driving rod 41 drives the driving seat 42 to move, the driving seat 42 can drive the rotating rod 49 and the limiting plate 45 to move.

[0036] As Figure 5 , Figure 6As shown, the driving mechanism 4 further includes a threaded rod 43 and a moving plate 410. The moving plate 410 is slidably installed on the surface of the workbench 1, and the threaded rod 43 is fixedly installed on the surface of the moving plate 410. One end of the threaded rod 43 away from the workbench 1 is slidably connected through the push plate 34 and the limiting plate 45. Threads are provided on the outer side of the threaded rod 43. The first driving ring 46 is sleeved on the outer side of the threaded rod 43, and the first driving ring 46 is screwed to the threaded rod 43. A synchronous belt 48 is installed on the first driving ring 46. The synchronous belt 48 is located inside the limiting plate 45, and the other end of the synchronous belt 48 is connected to the second driving ring 47. When the limiting plate 45 moves, the limiting plate 45 drives the first driving ring 46 to move. Since the first driving ring 46 is screwed to the threaded rod 43, when the limiting plate 45 drives the first driving ring 46 to move along the threaded rod 43, the first driving ring 46 rotates. At this time, the first driving ring 46 drives the synchronous belt 48 to work, the synchronous belt 48 drives the second driving ring 47 to rotate, and the second driving ring 47 drives the rotating rod 49 to rotate.

[0037] As Figure 5 , Figure 6 shown, the driving mechanism 4 further includes a connecting seat 44. The connecting seat 44 is fixedly installed at the bottom of one end of the rotating rod 49 passing through the driving seat 42. When the rotating rod 49 rotates, the rotating rod 49 can drive the connecting seat 44 to rotate.

[0038] As Figure 3 , Figure 5 , Figure 6 , Figure 7 shown, the collecting mechanism 5 includes a first housing 51 and a second housing 52. The top of the second housing 52 is fixedly connected to the connecting seat 44. Dispelling blades 55 are fixedly installed at the bottoms of both the first housing 51 and the second housing 52. A buckle 59 is fixedly installed at the top of the first housing 51. A card slot 510 is provided at one end of the connecting seat 44 close to the first housing 51. The buckle 59 is inserted into the card slot 510. A second magnet 58 is fixedly installed at the bottom of the first housing 51. The outer side of the second magnet 58 close to the first housing 51 is movably sealed to the inner wall of the first housing 51. The connecting seat 44 can drive the first housing 51 and the second housing 52 to rotate. The first housing 51 and the second housing 52 drive the dispelling blades 55 to rotate, and the dispelling blades 55 can dispel the garbage on the water surface.

[0039] As Figure 5 , Figure 6 , Figure 7As shown in the figure, a clamping frame 53 is fixedly installed at the bottom of the connecting seat 44. A mounting shaft 54 is rotatably installed at one end of the clamping frame 53 away from the connecting seat 44. A collection bottle 57 is rotatably installed through the surface of the mounting shaft 54. The collection bottle 57 is located inside the first outer shell 51 and the second outer shell 52. A second magnet 58 is fixedly installed on the outer side of the bottom of the collection bottle 57. A filter plate 511 is fixedly installed at the bottom of the first outer shell 51. The filter plate 511 is movably and hermetically connected to the inner wall of the first outer shell 51 near the outer side of the first outer shell 51. In addition, the filter plate 511 can also filter out a part of the garbage. After the water sample enters the inside of the first outer shell 51 and the second outer shell 52 through the second magnet 58, the water sample will cause the collection bottle 57 to rotate by buoyancy. The collection bottle 57 rotates on the clamping frame 53 through the mounting shaft 54. The second magnet 58 at the bottom of the collection bottle 57 will be adsorbed to the first magnet 56, thereby keeping the collection bottle 57 inclined at a certain angle, which is convenient for collecting water samples. After a certain amount of water samples are collected, the weight of the water samples will drive the collection bottle 57 to rotate, so that the second magnet 58 and the first magnet 56 are disconnected from the adsorption connection, thereby avoiding insufficient water samples being collected.

[0040] Working principle: When it is necessary to collect water samples, the first hydraulic rod 31 can be activated. The output end of the first hydraulic rod 31 can drive the slide plate 32 to move along the support frame 2 to adjust the collection height. Then, the second hydraulic rod 33 on the slide plate 32 is activated. The output end of the second hydraulic rod 33 can drive the push plate 34 to move, which can adjust the collection position. At the same time, when the push plate 34 moves, the push plate 34 will drive the driving rod 41 to move. The driving rod 41 drives the driving seat 42 to move. The driving seat 42 can drive the rotating rod 49 and the limiting plate 45 to move. The limiting plate 45 drives the first driving ring 46 to move. Since the first driving ring 46 is helically connected to the threaded rod 43, when the limiting plate 45 drives the first driving ring 46 to move along the threaded rod 43, the first driving ring 46 rotates. At this time, the first driving ring 46 drives the synchronous belt 48 to work. The synchronous belt 48 drives the second driving ring 47 to rotate. The second driving ring 47 drives the rotating rod 49 to rotate. The rotating rod 49 can drive the connecting seat 44 to rotate. The connecting seat 44 can drive the first outer shell 51 and the second outer shell 52 to rotate. The first outer shell 51 and the second outer shell 52 drive the dispersing blades 55 to rotate. The dispersing blades 55 can disperse the garbage on the water surface. In addition, the filter plate 511 can also filter out a part of the garbage. After the water sample enters the interiors of the first outer shell 51 and the second outer shell 52 through the second magnet 58, the water sample will cause the collection bottle 57 to rotate by buoyancy. The collection bottle 57 rotates on the clamping frame 53 through the mounting shaft 54. The second magnet 58 at the bottom of the collection bottle 57 adsorbs to the first magnet 56, thereby keeping the collection bottle 57 tilted at a certain angle, which is convenient for collecting water samples. After a certain amount of water samples are collected, the weight of the water samples will drive the collection bottle 57 to rotate, so that the second magnet 58 and the first magnet 56 cancel the adsorption connection. This can avoid insufficient water samples collected. In addition, the buckle 59 on the first outer shell 51 can be disconnected from the card slot 510 on the connecting seat 44, and the first outer shell 51 and the second outer shell 52 can be disassembled to take out the water samples collected in the collection bottle 57. At the same time, the second magnet 58 can be cleaned.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for studying the control effect of ferns on soil phosphorus nutrients, comprising a workbench (1), characterized in that, A support frame (2) for support is provided on the workbench (1). An adjustment mechanism (3) for adjusting the position of collecting water samples is provided on the support frame (2). A collection mechanism (5) for dispersing floating garbage on the water surface when collecting water samples is provided on the adjustment mechanism (3). A driving mechanism (4) for driving the collection mechanism (5) to work and ensuring that the collected water samples are sufficient is provided on the adjustment mechanism (3). The adjustment mechanism (3) includes a first hydraulic rod (31). The first hydraulic rod (31) is fixedly installed on the surface of the workbench (1). The output end of the first hydraulic rod (31) is fixedly installed with a sliding plate (32). The sliding plate (32) is located between the two support frames (2). The two ends of the sliding plate (32) slide along the support frames (2) respectively. A second hydraulic rod (33) is fixedly installed on the side of the sliding plate (32) away from the output end of the first hydraulic rod (31). The output end of the second hydraulic rod (33) is fixedly installed with a push plate (34). The cross section of the push plate (34) is L-shaped. The driving mechanism (4) includes a driving rod (41). The top of the driving rod (41) is fixedly installed at the bottom of the push plate (34). The end of the driving rod (41) away from the push plate (34) is fixedly installed with a driving seat (42). A limiting plate (45) is embedded in the driving seat (42). A rotating rod (49) is rotatably installed at the end of the driving rod (41) close to the driving seat (42). The rotating rod (49) rotates inside the driving seat (42). A first driving ring (46) and a second driving ring (47) are respectively rotatably installed at both ends inside the limiting plate (45). The second driving ring (47) is fixedly sleeved on the outer side of the rotating rod (49). The driving mechanism (4) further includes a threaded rod (43) and a moving plate (410). The moving plate (410) is slidably installed on the surface of the workbench (1). The threaded rod (43) is fixedly installed on the surface of the moving plate (410). The end of the threaded rod (43) away from the workbench (1) is slidably connected through the push plate (34) and the limiting plate (45). Threads are provided on the outer side of the threaded rod (43). The first driving ring (46) is sleeved on the outer side of the threaded rod (43). The first driving ring (46) is helically connected with the threaded rod (43). A synchronous belt (48) is installed on the first driving ring (46). The synchronous belt (48) is located inside the limiting plate (45). The other end of the synchronous belt (48) is connected to the second driving ring (47). The driving mechanism (4) further includes a connecting seat (44). The connecting seat (44) is fixedly installed at the bottom of the end of the rotating rod (49) passing through the driving seat (42). The collection mechanism (5) includes a first outer shell (51) and a second outer shell (52). The top of the second outer shell (52) is fixedly connected to the connecting seat (44). Dispelling blades (55) are fixedly installed at the bottoms of both the first outer shell (51) and the second outer shell (52). A buckle (59) is fixedly installed at the top of the first outer shell (51). A card slot (510) is formed at one end of the connecting seat (44) close to the first outer shell (51). The buckle (59) is inserted into the card slot (510).

2. The sampling device for studying the control effect of fern on soil phosphorus nutrient according to claim 1, wherein Universal wheels for movement are provided at the bottom of the workbench (1).

3. The sampling device for studying the control effect of fern on soil phosphorus nutrient according to claim 1, characterized in that, Two support frames (2) are fixedly installed on the surface of the workbench (1), and the support frames (2) are U-shaped.

4. The sampling device for studying the control effect of fern on soil phosphorus nutrient according to claim 1, characterized in that A filter plate (511) is fixedly installed at the bottom of the first outer shell (51). The outside of the filter plate (511) close to the first outer shell (51) is movably and hermetically connected to the inner wall of the first outer shell (51).

5. The sampling device for studying the control effect of fern on soil phosphorus nutrient according to claim 1, characterized in that A clamping frame (53) is fixedly installed at the bottom of the connecting seat (44). A mounting shaft (54) is rotatably installed at one end of the clamping frame (53) away from the connecting seat (44). A collection bottle (57) is rotatably installed through the surface of the mounting shaft (54). The collection bottle (57) is located inside the first outer shell (51) and the second outer shell (52). A second magnet (58) is fixedly installed on the outer side of the bottom of the collection bottle (57). A first magnet (56) is fixedly installed on the inner wall of the second outer shell (52). The second magnet (58) is movably and magnetically connected to the first magnet (56).

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