Submerged plant diversity restoration method and biological window

Abstract

The invention provides a submerged plant diversity restoration method and a biological window, and the method comprises the following steps: obtaining position information of a to-be-restored water area, the position information comprising latitude information; determining the target size of the biological window according to the latitude information; preparing a biological window according to the biological window target size, and arranging the biological window in the water area to enable the biological window to be arranged in the water area in a single or community form; submerged plants are planted in the biological windows; and cultivating the submerged plants according to a preset restoration period. The biological window comprises an upper frame, a lower frame, stand columns and an enclosure net, the upper frame and the lower frame are connected into a frame structure through the stand columns, and the enclosure net is arranged on the side portion of the frame structure for enclosure. According to the method, an economical and efficient engineering technology path can be provided for restoration of diversity of submerged plants in the damaged aquatic ecosystem and optimization construction of the healthy aquatic ecosystem, and the method has important significance on restoration of health of the aquatic ecosystem and improvement of water environment quality.

Description

Technical Field

[0001] The present application relates to the technical field of ecological restoration of water pollution, and in particular to a method for restoring submerged plant diversity and a biological window. Background Art

[0002] Economical and efficient water pollution ecological restoration technology is an urgent requirement for improving the ecological environment of water bodies such as rivers, lakes and wetlands. The restoration of aquatic vegetation ecological diversity is the key to the restoration or reconstruction of healthy aquatic ecosystems. An important task of lake ecological restoration is to transform lakes from turbid water to clear water through the restoration of submerged plants. In the process of repairing damaged aquatic ecosystems, the restoration and reconstruction of healthy aquatic vegetation communities and their diversity are technical bottlenecks that plague engineering practice.

[0003] Currently, there are several ways to restore submerged vegetation:

[0004] 1. Bioremediation: It is the basis of ecological restoration. The success of bioremediation mainly depends on the following three aspects, namely, microbial activity, pollutant characteristics and environmental conditions.

[0005] 2. Physical and chemical restoration: They are the components of ecological restoration. Usually, in order to save the cost of environmental governance, physical or chemical restoration is often used as the pre-treatment stage of biological restoration.

[0006] 3. Phytoremediation: It is the basic form of ecological restoration. Generally speaking, phytoremediation includes almost all the mechanisms of ecological restoration and is the basic form of ecological restoration.

[0007] However, among the existing restoration methods, there are very few projects that can achieve good governance effects and obtain good technical and economic indicators. Summary of the invention

[0008] In order to at least partially solve the above-mentioned technical problems, the present application provides a method for restoring submerged plant diversity and a biological window. By setting up a regional semi-isolated space in the water body and introducing suitable plants, submerged plant diversity restoration is achieved, achieving better management effects.

[0009] This application adopts the following technical solutions:

[0010] In a first aspect of the present application, a method for restoring submerged plant diversity is provided, comprising the following steps:

[0011] Acquire location information of the water area to be repaired, wherein the location information includes latitude information;

[0012] Determining a biological window target size according to the latitude information;

[0013] Preparing biological windows according to the target size of the biological windows, and arranging the biological windows in the water area, so that the biological windows are arranged in the water area in a single or community form;

[0014] Planting submerged plants in the biological window;

[0015] The submerged plants are cultivated in a preset restoration cycle.

[0016] In an optional solution provided in the present application, determining the biological window target size according to the latitude information includes:

[0017] Calculate the biological window reference diameter according to the latitude information;

[0018] When the area value corresponding to the reference diameter does not exceed a preset area threshold, determining the area value of the biological window target size according to the preset area threshold, and setting the biological window target size according to the preset area threshold;

[0019] When the reference diameter exceeds a preset distance value, the biological window target size is set according to the reference diameter value.

[0020] In an optional solution provided in the present application, the biological window reference diameter is calculated according to the latitude information; including calculating the distance R when the noon sun rays can illuminate the bottom center position of the biological window at the latitude during the vernal equinox and the autumnal equinox, and the reference diameter is R; the distance R calculation formula is:

[0021]

[0022] Among them, D represents the depth of the water area; n1 represents the refractive index of light in air; n2 represents the refractive index of light in water; φ0 represents the geographical latitude of the point where the sun is directly above the ground at that time; φ1 represents the local geographical latitude.

[0023] In an optional solution provided in the present application, the maximum value of the reference diameter of the biological window is set to 3 times the water depth.

[0024] In an optional solution provided in the present application, the cylindrical height of the biological window satisfies the following formula:

[0025] H=D+h+m

[0026] Among them, H represents the cylindrical height of the biological window, D represents the depth of the water area, h represents the height of the top of the biological window above the water surface of the water area during the flood season, and m is the depth of insertion into the mud; the range of h is 10 to 15 cm, and the range of m is 10 to 15 cm.

[0027] In an optional solution provided in the present application, the biological window is prepared according to the target size of the biological window, and the biological window is arranged in the water area so that the biological window is set in the water area in a single or community form; including:

[0028] According to the preset area threshold or reference diameter value, combined with the projection shape of the biological window, a biological window target size is set, wherein the biological window target size includes the biological window perimeter;

[0029] The biological windows are prepared according to the target size of the biological windows, and are placed in the water area in a set pattern layout.

[0030] In an optional solution provided by the present application, the setting pattern is a group in the shape of a triangle, and one or more groups in the shape of a triangle are set according to the size of the water area;

[0031] The one triangular group includes three biological windows, the three biological windows are distributed in an equilateral triangle, and the distance a between the boundaries of two adjacent biological windows is equal to the diameter d of one biological window;

[0032] When the plurality of in-shaped groups are clustered, at least three in-shaped groups still adopt an equilateral triangle in-shaped structure, wherein a distance b between two adjacent in-shaped groups is equal to a boundary length c of a in-shaped group.

[0033] In an optional solution provided in the present application, the total area of ​​all biological windows is set based on the total area of ​​the water area to be restored, the number of species categories and the biomass density.

[0034] According to a second aspect of the present application, a bio-window for restoring submerged plant diversity is provided, wherein the bio-window comprises an upper frame, a lower frame, columns, and a protective net, wherein the upper frame and the lower frame are connected to form a frame structure through columns, and a protective net is arranged on the side of the frame structure for enclosure.

[0035] In an optional solution provided in the present application, the biological window further includes a fixing rod and an oblique support structure; the fixing rod is connected between the upper frame and the lower frame to reinforce the frame structure; the oblique support structure is arranged outside the frame structure to support the frame structure;

[0036] The upper frame, the lower frame, the upright column, the fixing rod and the oblique supporting structure are rods, and the rods are connected in a pluggable manner.

[0037] A method for restoring the diversity of submerged plants and a biological window provided by the present application obtain the location information of the water area to be restored, where the location information includes latitude information; determine the target size of the biological window according to the latitude information; prepare the biological window according to the target size of the biological window, and layout the biological window in the water area so that the biological window is arranged in the water area in a single or community form; colonize submerged plants in the biological window; cultivate the submerged plants with a preset restoration period to achieve the restoration of the diversity of submerged plants, providing an economical and efficient engineering and technical path for the restoration of the diversity of submerged plants in damaged water ecosystems in China and the optimized construction of healthy aquatic ecosystems. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0039] Figure 1 Schematic diagram of the restoration method provided by the present application;

[0040] Figure 2 Schematic diagram of a biological window structure provided by the present application;

[0041] Figure 3 Schematic diagram of the shape of the upper border of a biological window provided by the present application;

[0042] Figure 4 Schematic diagram of the minimum radius of a circular biological window provided by the present application;

[0043] Figure 5 Schematic diagram of the "pin" - shaped group agglomeration layout of a biological window provided by the present application.

[0044] Description of the reference numerals:

[0045] 1 - upper border, 2 - lower border, 3 - column, 4 - fixing rod, 5 - inclined support structure, 6 - enclosure net. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0047] In areas where species are single and aquatic vegetation grows densely, there is often a lack of biological windows that are necessary for healthy vegetation communities. The present application provides a method for restoring submerged plant diversity and a biological window. Each biological window plays an important role in maintaining its internal community composition, functional structure, and biodiversity, and is the main driving force for the process of community diversity succession. The biological window of the present application is an important driving force for the renewal of vegetation communities and their co-evolution with the environment, and plays an important role in the dynamic succession of vegetation systems and the optimization of ecological functions. By artificially regulating biological windows, the degradation of aquatic vegetation community diversity can be reversed, and the healthy succession of vegetation community diversity can be promoted, providing an important technical approach for the restoration or reconstruction of aquatic ecosystems, which is of great significance to the healthy restoration of my country's aquatic ecosystems and the improvement of water environment quality.

[0048] See also Figure 1 The present application provides a method for restoring submerged plant diversity, comprising the following steps:

[0049] S1: Acquire location information of the water area to be repaired, wherein the location information includes latitude information;

[0050] S2: determining the biological window target size according to the latitude information;

[0051] S3: preparing biological windows according to the target size of the biological windows, and arranging the biological windows in the water area, so that the biological windows are arranged in the water area in a single or community form;

[0052] S4: Planting submerged macrophytes within the biological window;

[0053] S5: Cultivating the submerged plants in a preset restoration cycle.

[0054] The above serial numbers do not constitute a limitation on the implementation steps of this application, but are added only for the convenience of explanation in the following text. For example, step S4 can be implemented after the preparation of the biological window in S3 is completed, that is, after the biological window is prepared, submerged plants are first planted, and then the biological window after planting is arranged in the water area. This method of planting can be carried out outside the water and then transported to the corresponding water area, which is efficient and convenient; S4 can also be implemented after the implementation of step S3, that is, after the empty biological window is placed in the water area, plants are planted in the biological window. This method of direct planting at the destination is conducive to improving the survival rate and ecological adaptability of plants, and implementing differentiated planting of different depths and densities for different crops. It is flexible and targeted, and at the same time avoids the loss of the pre-planting method during transportation.

[0055] In one embodiment provided in the present application, determining the biological window target size according to the latitude information includes:

[0056] S201: Calculating a biological window reference diameter according to the latitude information;

[0057] In water ecological restoration projects, choosing the right biological window size is the key to restoring the diversity of submerged plant communities. The biological window benchmark diameter is calculated based on the local geographical latitude and solar altitude, the refractive index of water to light, and the water depth of the water area to be restored.

[0058] S202: when the area value corresponding to the reference diameter does not exceed a preset area threshold, determining the area value of the biological window target size according to the preset area threshold, and setting the biological window target size according to the preset area threshold;

[0059] When the reference diameter exceeds a preset distance value, the biological window target size is set according to the reference diameter value.

[0060] The above-mentioned reference diameter is defined as follows: when the top of the biological window is a circle, the reference diameter refers to the radius of the circle; when the top of the biological window is not a circle, the reference diameter refers to half of the minimum east-west tangent distance of the top contour of the biological window.

[0061] In one embodiment provided in the present application, step S201, the biological window reference diameter is calculated according to the latitude information; including calculating the minimum radius R when the noon sun rays can illuminate the bottom center position of the biological window at the latitude during the vernal equinox and the autumnal equinox, see Figure 4 In this embodiment, the biological window is circular, and the radius R is the reference diameter; the distance R is calculated as follows:

[0062]

[0063] Among them, D represents the depth of the water area; n1 represents the refractive index of light in air; n2 represents the refractive index of light in water; φ0 represents the geographical latitude of the point where the sun is directly above the ground at that time; φ1 represents the local geographical latitude.

[0064] Specifically, in step S202, when the area value corresponding to the reference diameter does not exceed the preset area threshold, the area value of the biological window target size is determined according to the preset area threshold, and the biological window target size is set according to the preset area threshold; taking the shallow water depth as an example, when the calculated minimum radius R of the biological window is too small, the area value corresponding to the reference diameter does not exceed the preset area threshold, such as not exceeding 3m 2 , then the preset area threshold of the biological window is set to 3m 2 According to this threshold, the design area of ​​the biological window is set to be ≥ 3m 2 .

[0065] In one embodiment provided in the present application, considering the convenience and economy of the biological window construction, the maximum value of the reference diameter of the biological window is set to 3 times the water depth.

[0066] In one embodiment provided in the present application, the cylindrical height of the biological window satisfies the following formula:

[0067] H=D+h+m

[0068] Among them, H represents the cylindrical height of the biological window, D represents the depth of the water area, h represents the height of the top of the biological window above the water surface of the water area during the flood season, and m is the depth of insertion into the mud.

[0069] In the above formula, the cylindrical height H of the biological window is determined by the depth D of the water area. The top is slightly higher than the water depth of the water area involved in the project during the flood season. There should be no gap between the bottom and the bottom mud of the water area and the window should be inserted into the mud. Therefore, the height h of the top of the biological window above the water surface of the water area during the flood season is set to be in the range of 10 to 15 cm, and the depth m of the bottom of the biological window inserted into the mud is set to be in the range of 10 to 15 cm.

[0070] In one embodiment provided in the present application, step S3, preparing a biological window according to the target size of the biological window, arranging the biological window in the water area, and setting the biological window in the water area in a single or community form; includes:

[0071] S301: setting a biological window target size according to the preset area threshold or reference diameter value and in combination with the projection shape of the biological window, wherein the biological window target size includes the biological window perimeter;

[0072] S302: preparing biological windows according to the target size of the biological windows, and placing the biological windows in the water area in a set layout.

[0073] In one embodiment provided in the present application, the setting pattern is a group of triangles, see Figure 5 , according to the size of the water area, set up one or more Chinese-shaped groups;

[0074] The one triangular group includes three biological windows, the three biological windows are distributed in an equilateral triangle, and the distance a between the boundaries of two adjacent biological windows is equal to the diameter d of one biological window;

[0075] When the plurality of in-shaped groups are clustered, at least three in-shaped groups still adopt an equilateral triangle in-shaped structure, wherein a distance b between two adjacent in-shaped groups is equal to a boundary length c of a in-shaped group.

[0076] In one embodiment provided in the present application, the total area of ​​all biological windows is set according to the total area of ​​the water area to be restored, the number of species and the biomass density. For example, when the biomass density is relatively large (e.g., 8 kg / m 2 ) For single species restoration areas, the ratio of the total area of ​​all biological windows to the total area of ​​the restoration area is set to ≥ 5%.

[0077] This application also provides a submerged plant diversity restoration biological window, see Figure 2The biological window includes an upper frame 1, a lower frame 2, columns 3, and a protective net 6. The upper frame 1 and the lower frame 2 are connected to form a frame structure through the columns 3, and a protective net 6 is set on the side of the frame structure for enclosure. As a result, the biological window presents a cylindrical structure with upper and lower openings and a mesh enclosure on the side wall. Furthermore, the upper frame 1 and the lower frame 2 can be of the same size or different sizes, and can be of the same shape or different shapes, that is, the biological window only presents a basic cylindrical structure, but its upper and lower frames can be set according to the plants to be implanted therein and the required ecological environment. For example, for light-loving plants, a biological window that is wide at the top and narrow at the bottom can be used, and for light-averse plants, a biological window that is narrow at the top and wide at the bottom can be used. Of course, a cylindrical biological window that is consistent at the top and bottom can also be used.

[0078] Furthermore, the biological window cylinder wall can be tightly enclosed by a protective net 6 with a pore size of 10 mm to control large grazing fish from entering the biological window. The protective net 6 and the cylinder wall rod structure are fixed with a wire tie, a tie or a thin rope. The protective net 6 is made of nylon, polyethylene net or a composite fiber material of the two. It not only controls large grazing fish and avoids damage to plants in the biological window, but also allows small and micro organisms to enter, ensuring the adaptability and ecological balance of the biological window to the restored water area.

[0079] In one embodiment provided in the present application, the enclosure net 6 can be made of a transparent material to maintain natural sunlight exposure, simulate the natural form to the maximum extent, and avoid the impact of sunlight factors on the ecology inside the biological window.

[0080] Furthermore, the shapes of the upper frame 1 and the lower frame 2 can be circular, elliptical or any shape that is compatible with the natural site conditions (see attached Figure 3 a, b, c).

[0081] In one embodiment provided in the present application, the biological window further includes a fixing rod 4 and an oblique support structure 5; the fixing rod 4 is connected between the upper frame 1 and the lower frame 2 to reinforce the frame structure; the oblique support structure 5 is arranged outside the frame structure to support the frame structure;

[0082] The upper frame 1, the lower frame 2, the columns 3, the fixing rods 4 and the inclined supporting structure 5 are rods, which can be steel pipes or bamboo materials. The rods are pluggable and can be connected using two-way or three-way joints, which is convenient for on-site assembly and removal after restoration of aquatic plant diversity.

[0083] Example

[0084] Taking a certain water area as an example, an experimental project for restoration of submerged plant diversity led by the bio-window technology of this application was carried out using the method and device provided in this application.

[0085] Basic situation of the test area: Geographical latitude, 38.8 degrees north latitude. Water depth 1.5 m, transparency 1.7 m, COD 26 mg / l, TP 0.43 mg / l, TN 1.5 mg / l. Total area of the restoration area is 10,000 m 2 . Before restoration, the main submerged plants were Potamogeton crispus and a small amount of Ceratophyllum demersum and Chara sp., belonging to a dense single-species community of Potamogeton crispus, with a fresh weight biomass of up to 13 kg / m 2 , and the ecological imbalance of plant diversity. The entire restoration area was isolated by enclosures.

[0086] Restoration measures: According to the local geographical latitude, the reference diameter of the biological window is calculated to be 0.8 m. In this embodiment, a circular biological window is adopted, so the minimum radius of the circle is 0.8 m. Since the area of the circle corresponding to this radius is 2 m 2 , which does not exceed the preset area threshold. Based on the preset area threshold of 3 m 2 , the area value of the target size of the biological window is determined, and the designed area is set to 9π m 2 . Based on this area, the target size of the biological window is calculated, that is, the radius is 3 m and the circumference is 6π m. Then, rods of the corresponding length can be selected for production. Exemplarily, the skeleton rods are made of galvanized pipes with a diameter of 32 mm, and the enclosure net is made of nylon net with a pore size of 10 mm. 18 biological windows are arranged in a "pin" - shaped agglomerated layout, forming 6 "pin" - shaped groups. The total area of the biological windows is 508.68 m 2 , accounting for 5.08% of the total area of the restoration area. Before planting submerged plants in the biological windows, the original Potamogeton crispus was removed. The submerged plants planted in the biological windows are: Myriophyllum spicatum, Potamogeton pectinatus, Potamogeton malaianus and Hydrilla verticillata, a total of 4 species. One kind of submerged plant is planted in each biological window, and the 3 biological windows in a small "pin" - shaped group structure are planted with different species respectively. The planting density of all 4 species of submerged plants is 50 buds / m 2 , with a planting design of 10 buds / clump.

[0087] Situation after restoration: The restoration time is 2 plant growth cycles. At the beginning of the restoration area, there were only 3 species of plants, Potamogeton crispus, Ceratophyllum demersum and Chara sp., and the Shannon diversity index was 0.39. At the end, there were 7 species of plants in the restoration area, Potamogeton crispus, Ceratophyllum demersum, Chara sp., Potamogeton pectinatus, Potamogeton malaianus and Hydrilla verticillata, and the Shannon diversity index was 1.81. Refer to Table 1 - Comparison table of biological species and proportions before and after restoration.

[0088] Table 1 Comparison table of biological species and proportions before and after restoration

[0089]

[0090] As can be seen from Table 1 above, before restoration, there were too many water chestnuts in the biological window and the plant homogeneity was high. After restoration, the content of other plants increased and the content of water chestnuts dropped to a balanced level. After restoration, the species biomass structure was optimized and the diversity level of aquatic plants was greatly improved.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for restoring submerged plant diversity, characterized in that: The following steps are involved: Acquire location information of the water area to be repaired, wherein the location information includes latitude information; Determining a biological window target size according to the latitude information; Preparing biological windows according to the target size of the biological windows, and arranging the biological windows in the water area, so that the biological windows are arranged in the water area in a single or community form; Planting submerged plants in the biological window; The submerged plants are cultivated in a preset restoration cycle.

2. A method for restoring submerged plant diversity according to claim 1, characterized in that: The determining of the biological window target size according to the latitude information includes: Calculate the biological window reference diameter according to the latitude information; When the area value corresponding to the reference diameter does not exceed a preset area threshold, determining the area value of the biological window target size according to the preset area threshold, and setting the biological window target size according to the preset area threshold; When the reference diameter exceeds a preset distance value, the biological window target size is set according to the reference diameter value.

3. A method for restoring submerged plant diversity according to claim 2, characterized in that: The calculation of the biological window reference diameter according to the latitude information includes calculating the distance R when the noon sun rays can illuminate the bottom center position of the biological window at the latitude during the spring equinox and autumnal equinox, and the reference diameter is R; the calculation formula of the distance R is: Among them, D represents the depth of the water area; n1 represents the refractive index of light in air; n2 represents the refractive index of light in water; φ0 represents the geographical latitude of the point where the sun is directly above the ground at that time; φ1 represents the local geographical latitude.

4. A method for restoring submerged plant diversity according to claim 2, characterized in that: The maximum value of the reference diameter of the biological window is set to 3 times the water depth.

5. A method for restoring submerged plant diversity according to claim 2, characterized in that: The cylindrical height of the biological window satisfies the following formula, H=D+h+m Among them, H represents the cylindrical height of the biological window, D represents the depth of the water area, h represents the height of the top of the biological window above the water surface of the water area during the flood season, and m is the depth of insertion into the mud; the range of h is 10 to 15 cm, and the range of m is 10 to 15 cm.

6. A method for restoring submerged plant diversity according to claim 2, characterized in that: The biological windows are prepared according to the target size of the biological windows, and the biological windows are arranged in the water area so that the biological windows are arranged in the water area in a single or community form; include, According to the preset area threshold or reference diameter value, combined with the projection shape of the biological window, a biological window target size is set, wherein the biological window target size includes the biological window perimeter; The biological windows are prepared according to the target size of the biological windows, and are placed in the water area in a set pattern layout.

7. A method for restoring submerged plant diversity according to claim 6, characterized in that: The setting pattern is a group in the shape of a triangle, and one or more groups in the shape of a triangle are set according to the size of the water area; The one triangular group includes three biological windows, the three biological windows are distributed in an equilateral triangle, and the distance a between the boundaries of two adjacent biological windows is equal to the diameter d of one biological window; When the plurality of in-shaped groups are clustered, at least three in-shaped groups still adopt an equilateral triangle in-shaped structure, wherein a distance b between two adjacent in-shaped groups is equal to a boundary length c of a in-shaped group.

8. A method for restoring submerged plant diversity according to claim 7, characterized in that: The total area of ​​all biological windows is set based on the total area of ​​the water area to be restored, the number of species and biomass density.

9. A biowindow for restoration of submerged plant diversity, characterized in that: The biological window comprises an upper frame (1), a lower frame (2), columns (3), and a protective net (6); the upper frame (1) and the lower frame (2) are connected to form a frame structure via the columns (3); and a protective net (6) is arranged on the side of the frame structure for enclosure.

10. A submerged plant diversity restoration biological window according to claim 9, characterized in that: The biological window further comprises a fixing rod (4) and an oblique support structure (5); the fixing rod (4) is connected between the upper frame (1) and the lower frame (2) to reinforce the frame structure; the oblique support structure (5) is arranged outside the frame structure to support the frame structure; The upper frame (1), the lower frame (2), the upright column (3), the fixing rod (4) and the oblique supporting structure (5) are rods, and the rods are connected to each other in a pluggable manner.

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