An aquatic plant planting device and a rainwater regulation and storage system thereof

By using the flexible splicing design of the buoyancy support and planting trough, as well as the rainwater storage system, the problems of complex structure and insufficient rainwater storage of aquatic plant planting devices have been solved. This has enabled the rapid disassembly and assembly, expansion, and efficient pollutant treatment of the device, while also improving its compressive strength and photosynthetic efficiency.

CN224473812UActive Publication Date: 2026-07-10GUANGZHOU JIAHUI GARDEN LVHUA ARCHITECTURE ENG CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGZHOU JIAHUI GARDEN LVHUA ARCHITECTURE ENG CO LTD
Filing Date
2025-06-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing aquatic plant cultivation devices have complex structures, making it difficult to expand the planting area. They also lack effective rainwater storage designs, resulting in a large workload and inconvenient operation.

Method used

A water plant planting device is provided, which adopts a vertical stacking structure of buoyancy support and planting trough. The buoyancy support is composed of multiple buoyancy modules connected by an elastic splicing mechanism, and the planting trough is composed of multiple planting modules connected by an elastic splicing mechanism. Combined with a rainwater storage system including a primary water storage area, a double-layer water filtration layer and a water level adjustment device, it can achieve rapid assembly and disassembly and dynamic deformation, and has rainwater storage and purification functions.

Benefits of technology

It enables rapid disassembly and expansion of aquatic plant planting devices, reduces workload, improves compressive strength and water wave impact resistance, enhances rainwater storage and pollutant treatment efficiency, reduces the risk of substrate loss, and improves photosynthetic efficiency and pollutant removal rate.

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Abstract

The application relates to an aquatic plant planting device and a rainwater storage system thereof, which comprises a buoyancy support and a planting groove, the buoyancy support is installed at the bottom of the planting groove, and the buoyancy support and the planting groove are assembled to form a vertical stacking structure; the buoyancy support is formed by splicing a plurality of buoyancy modules through an elastic splicing mechanism, the buoyancy module is hexagonal, and the plurality of buoyancy modules are spliced in a honeycomb shape to form the buoyancy support; the planting groove is formed by splicing a plurality of planting modules through the elastic splicing mechanism, dynamic deformation is realized through the elastic splicing mechanism, and the problem that traditional threaded connection is complicated to disassemble is solved. One planting module corresponds to three or four buoyancy modules to form an integrated bearing structure, and the integrated bearing structure is stable and can adapt to larger water wave impact.
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Description

Technical Field

[0001] This application relates to the technical field of landscaping and planting, and in particular to an aquatic plant planting device and its rainwater storage system. Background Technology

[0002] The ecological environment provides the basic material foundation for the development of various industries. Restoring the ecological environment has important practical significance, and plant-based environmental self-regeneration is the main means of ecological restoration.

[0003] Plants are mainly classified into terrestrial plants and aquatic plants according to their growth environment. In the planning and planting of aquatic plants, the large area of ​​rivers, lakes, and seas makes the operation difficult, and the homogeneity of water quality also makes plant growth difficult to control. Therefore, specific planting devices are needed to quickly and conveniently plant plants within a predetermined area and control their growth and spread within that area.

[0004] However, technicians found during actual planting that the existing planting devices consisted of ordinary plastic pots filled with hydroponic media such as rock wool, fiber, or hydroponic foam boards. The current planting devices have a complex structure, making it difficult to expand the planting area based on existing plantings. Furthermore, the workload for staff assembling and planting aquatic plants is substantial, and there is no adequate design for rainwater harvesting and regulation. Utility Model Content

[0005] Therefore, it is necessary to provide an aquatic plant cultivation device to address the problem of the complex structure of existing planting devices.

[0006] On the one hand, this application provides an aquatic plant planting device, which includes: a buoyancy support and a planting trough, wherein the buoyancy support is installed at the bottom of the planting trough, and the buoyancy support and the planting trough are assembled to form a vertically stacked structure;

[0007] The buoyancy support is formed by splicing multiple buoyancy modules together through an elastic splicing mechanism. The buoyancy modules are hexagonal in shape, and multiple buoyancy modules are spliced ​​together in a honeycomb pattern to form the buoyancy support. The planting trough is formed by splicing multiple planting modules together through an elastic splicing mechanism. One planting module corresponds to three or four buoyancy modules to form an integrated load-bearing structure.

[0008] In one embodiment, the bottom of the planting trough is provided with multiple permeable holes; the buoyancy support is a honeycomb porous structure, the upper holes of the porous structure near the bottom of the planting trough are corresponding to the permeable holes at the bottom of the planting trough to form a vertical water flow channel, and the lower holes of the porous structure away from the bottom of the planting trough are offset from the upper holes and communicate with the external water body.

[0009] In one embodiment, the buoyancy support includes a float with a double-layer hollow structure. The outer layer of the double-layer hollow structure is a high-density polyethylene shell, and the inner layer of the double-layer hollow structure is filled with biodegradable foamed particles. The top of the float integrates a water level sensing microcapsule. When the external water level exceeds a threshold, the sensing microcapsule ruptures and releases the foamed particle volume expansion agent, triggering adaptive buoyancy adjustment.

[0010] In one embodiment, the float of the buoyancy support is embedded with a magnetic positioning groove, and the planting trough is provided with a metal positioning part. The magnetic positioning groove of the float and the metal positioning part of the planting trough cooperate with each other to realize the quick assembly and disassembly of the buoyancy support and the planting trough.

[0011] In one embodiment, the buoyancy support has multiple holes distributed in a honeycomb pattern. The holes are hexagonal or circular, and the multiple holes form a connected network through staggered permeable holes.

[0012] In one embodiment, a permeable hole array is reserved at the bottom of a single planting module, and permeable holes are provided between adjacent planting modules, with the permeable holes being staggered to form a barrier against substrate loss.

[0013] In one embodiment, the bottom of the planting trough is provided with a root fixing net, the walls of the planting trough are made of biodegradable and environmentally friendly materials, and the substrate inside the planting trough is a mixed layer of expanded clay and peat moss.

[0014] In one embodiment, the elastic splicing mechanism includes an elastic connecting rod and a telescopic sleeve. The elastic connecting rod is disposed inside the telescopic sleeve and can move relative to the telescopic sleeve. The buoyancy module or the planting module can rotate relative to each other in the horizontal plane by 0-30° through the elastic connecting rod. The length of the telescopic sleeve can be automatically adjusted with water level fluctuations.

[0015] In one embodiment, the telescopic sleeve includes a first sleeve and a second sleeve, the second sleeve being telescopically fitted inside the first sleeve, and an elastic connector is provided between the second sleeve and the first sleeve. When subjected to the thrust of water waves, the elastic connector is stretched, and the length of the telescopic sleeve increases. When not subjected to the thrust of water waves, the elastic connector returns to its original position, and the length of the telescopic sleeve decreases.

[0016] On the other hand, this application also provides a rainwater storage system, including the aforementioned aquatic plant planting device, and further including...

[0017] The rainwater storage tank includes a primary water storage area and a secondary purification area. The primary water storage area is connected to the secondary purification area through a guide pipe, and a flow control valve is provided on the guide pipe.

[0018] A water filtration layer is set between the rainwater storage tank and the aquatic plant planting device, and includes a gravel layer, an activated carbon layer and a biofilm carrier layer.

[0019] The water level regulating device includes a water level sensor, an electric gate, and a controller. The controller regulates the water level difference between the prime number rainwater storage tank and the aquatic plant planting device based on the data from the water level sensor.

[0020] The aquatic plant cultivation device provided in this application includes: a buoyancy support and a planting trough. The buoyancy support is installed at the bottom of the planting trough, and the buoyancy support and the planting trough are assembled to form a vertically stacked structure. The buoyancy support is composed of multiple buoyancy modules spliced ​​together by an elastic splicing mechanism. The buoyancy modules are hexagonal in shape, and multiple buoyancy modules are spliced ​​together in a honeycomb pattern to form the buoyancy support. The planting trough is composed of multiple planting modules spliced ​​together by an elastic splicing mechanism. The elastic splicing mechanism enables dynamic deformation, solving the problem of cumbersome disassembly and reassembly of traditional threaded connections. One planting module corresponds to three or four buoyancy modules to form an integrated load-bearing structure. The integrated load-bearing structure is stable and can withstand large water wave impacts. Attached Figure Description

[0021] Figure 1 A schematic diagram of an aquatic plant cultivation device provided in one embodiment.

[0022] Figure 2 A schematic diagram of the buoyancy module of an aquatic plant cultivation device provided in another embodiment.

[0023] Figure 3 This is a schematic diagram of a rainwater storage system.

[0024] Among them, 1-buoyancy support; 11-buoyancy module; 12-elastic splicing mechanism; 2-planting trough; 3-aquatic plants; 4-aquatic plant planting device; 5-rainwater storage tank; 6-water filtration layer; 7-aquatic plant planting device. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] Combined with appendix Figure 1-2 As shown, this application provides an aquatic plant planting device, comprising: a buoyancy support 1 and a planting trough 2. The buoyancy support 1 is installed at the bottom of the planting trough 2, and the buoyancy support 1 and the planting trough 2 are assembled to form a vertically stacked structure. The uppermost part of this vertically stacked structure is aquatic plants, followed by the planting trough 2, then the buoyancy support 1, and the lowermost part is water. The vertically stacked structure is rationally designed. The bottom layer is the buoyancy support 1, which is suspended on the surface of the water through a porous structure, providing stable buoyancy support. The middle layer is the planting trough 2, which carries the ceramsite substrate and the roots of aquatic plants, forming a pollutant interception and adsorption layer. The top layer is the stems and leaves of aquatic plants, which are exposed above the water surface to maximize photosynthetic efficiency. The buoyancy support 1 is composed of multiple buoyancy modules 11 spliced ​​together by an elastic splicing mechanism 12, and the planting trough 2 is composed of multiple planting modules spliced ​​together by the elastic splicing mechanism 12. The elastic splicing mechanism 12 enables dynamic deformation, solving the problem of cumbersome disassembly and reassembly of traditional threaded connections. One planting module corresponds to three or four buoyancy modules 11 to form an integrated load-bearing structure. One planting module (including the weight of the plant, substrate, and water) corresponds to three to four buoyancy modules 11. Through the stress dispersion characteristics of the hexagonal honeycomb structure, concentrated loads are evenly transferred to multiple buoyancy modules 11, increasing compressive strength by 42% (test data) and preventing overturning due to local overload. The buoyancy modules are hexagonal in shape. The hexagonal structure evenly transfers external loads (water flow impact, plant weight) to six adjacent sides, reducing stress concentration by more than 40% compared to quadrilateral structures, and achieving a compressive strength ≥15MPa. Multiple buoyancy modules 11 are spliced ​​in a honeycomb pattern to form a buoyancy support 1. The honeycomb arrangement forms a continuous arched support, with a compressive strength equivalent to 1.5 times that of a traditional solid float.

[0032] In one embodiment, the bottom of the planting trough 2 is provided with multiple permeable holes; the buoyancy support 1 has a honeycomb porous structure, with the upper holes of the porous structure near the bottom of the planting trough 2 corresponding to the permeable holes at the bottom of the planting trough 2, forming a vertical water flow channel. The upper holes and permeable holes are aligned to form a directional vertical water flow channel, forcing water to vertically penetrate the substrate layer (ceramsite + peat moss) of the planting trough, extending the hydraulic retention time (HRT increased by 50%), and increasing the contact area of ​​pollutants by 2-3 times. The lower holes of the porous structure away from the bottom of the planting trough 2 are staggered with the upper holes and connected to the external water body, forming a circulating convection and preventing the accumulation of pollutants in the bottom anaerobic zone.

[0033] In one embodiment, the buoyancy support 1 includes a float with a double-layer hollow structure. The outer layer of the double-layer hollow structure is a high-density polyethylene shell, and the inner layer of the double-layer hollow structure is filled with biodegradable foam particles. The double buoyancy redundancy design is as follows: the outer high-density polyethylene shell provides basic buoyancy (density 0.95g / cm³, buoyancy ≥800N / m³), and the inner foam particles serve as emergency compensation to prevent the system from sinking due to a single point of failure.

[0034] The top of the pontoon integrates a water level sensing microcapsule. When the external water level exceeds a threshold, the microcapsule ruptures, releasing a foaming granule expansion agent, triggering adaptive buoyancy adjustment. The microcapsule ruptures based on a physical water pressure threshold (e.g., a preset water level pressure of 0.5-1.0m), releasing the foaming granule expansion agent (such as polyacrylamide or polylactic acid-based materials). After absorbing water, the granules expand in volume by 300%-500%, increasing buoyancy by 30%-50%.

[0035] In one embodiment, the float of the buoyancy support 1 is embedded with a magnetic positioning groove, and the planting trough 2 is provided with a metal positioning part. The magnetic positioning groove of the float and the metal positioning part of the planting trough 2 cooperate with each other to realize the quick assembly and disassembly between the buoyancy support 1 and the planting trough 2, which greatly reduces the amount of assembly work.

[0036] In one embodiment, the buoyancy support 1 has multiple holes arranged in a honeycomb pattern. The holes are hexagonal or circular, forming a continuous arched support structure (mimicking the honeycomb principle), which evenly distributes external loads (water flow impact, plant gravity) to adjacent hole walls, increasing compressive strength by 42%. The multiple holes are interconnected by staggered permeable holes, forming a network. These staggered permeable holes create a serpentine flow channel, forcing water flow to change direction and generating local eddies (Reynolds number Re≥3000), extending the contact time between pollutants and the ceramsite matrix by 2-3 times, and increasing the COD removal rate to 85%.

[0037] In one embodiment, a permeable hole array is pre-installed at the bottom of a single planting module, and permeable holes are also provided between multiple adjacent planting modules. The staggered distribution of permeable holes forms a barrier against substrate loss. The staggered permeable holes of adjacent planting modules form non-through channels, requiring substrate particles to migrate around the porous walls, increasing the path length by 2-3 times and significantly increasing escape resistance. Combined with the arrangement of permeable holes with different pore size gradients (e.g., 4mm pore size in the upper layer and 3mm pore size in the lower layer), a dual filtration mechanism is achieved, greatly reducing the loss rate of the expanded clay substrate.

[0038] In one embodiment, the bottom of the planting trough 2 is equipped with a root fixing net. This net (such as a double-layer mesh design) constrains the growth paths of the taproot and capillary roots, forming a mesh-like anchoring structure. The walls of the planting trough 2 are made of biodegradable and environmentally friendly materials, specifically PLA-straw composite material, with a degradation period of 18-24 months (pH 6-8 water), avoiding the microplastic pollution risk of traditional plastics while retaining structural strength (flexural strength ≥25MPa) throughout the planting period. The biodegradable material decomposes naturally after the trough is damaged, requiring no manual recycling. The substrate inside the planting trough 2 is a mixed layer of expanded clay and peat moss, with a 0.1-0.3mm biofilm forming on the surface of the mixed layer.

[0039] In one embodiment, the flexible splicing mechanism 12 includes a flexible connecting rod and a telescopic sleeve. The flexible connecting rod is disposed within the telescopic sleeve and is movable relative to the telescopic sleeve. The buoyancy module or planting module can rotate relative to the telescopic sleeve in the horizontal plane by 0-30° via the flexible connecting rod. The length of the telescopic sleeve can be automatically adjusted according to water level fluctuations. The flexible connecting rod can be made of TPU material. This allows the buoyancy module 11 or planting module to flexibly deflect in the horizontal plane, adapting to complex water conditions.

[0040] In one embodiment, the telescopic sleeve includes a first sleeve and a second sleeve, with the second sleeve telescopically fitted inside the first sleeve. An elastic connector is also provided between the second and first sleeves. When subjected to water wave thrust, the elastic connector is stretched, increasing the length of the telescopic sleeve; when no water wave thrust is applied, the elastic connector returns to its original position, shortening the length of the telescopic sleeve. The first and second sleeves achieve telescopic movement via an elastic connector (such as a spring steel sheet or shape memory alloy). When water level fluctuations cause displacement of the buoyancy module 11, the sleeve length can be extended by 10%-30%, releasing structural stress. Traditional fixed floating frames have a structural damage rate exceeding 50% when the daily water level fluctuation is ≥0.5m, while this design reduces the damage rate to below 5%. The elastic connector stretches and stores energy under water wave thrust, and elastically returns to its original position after the water flow calms down, with a cyclic fatigue resistance of >10 cycles. 6 times (amplitude ±3mm.

[0041] On the other hand, this application also provides a rainwater storage system, including the aforementioned aquatic plant planting device 7, and further including...

[0042] The rainwater storage tank 5 includes a primary water storage area and a secondary purification area. The primary water storage area is connected to the secondary purification area through a diversion pipe, and a flow control valve is installed on the diversion pipe. The primary water storage area and the secondary purification area are connected through the diversion pipe. The flow control valve automatically adjusts the diversion ratio according to the water volume. Initial rainwater preferentially enters the purification area for treatment, and the clean rainwater is stored or discharged later, reducing the risk of siltation in the storage tank.

[0043] Water filtration layer 6 is located between the rainwater storage tank and the aquatic plant planting device. It includes a gravel layer, an activated carbon layer, and a biofilm carrier layer. The water filtration layer forms a three-layer structure of gravel layer (intercepting large particulate suspended matter), activated carbon layer (adsorbing organic matter and heavy metals), and biofilm carrier layer (microbial degradation of pollutants), forming a synergistic purification path of "physical interception-chemical adsorption-biological decomposition", which significantly improves the removal efficiency of COD (chemical oxygen demand) and ammonia nitrogen (measured COD removal rate ≥85%).

[0044] The water level regulating device includes a water level sensor, an electric gate, and a controller. The controller adjusts the water level difference between the prime number rainwater storage tank and the aquatic plant planting device based on the data from the water level sensor. The water level regulating device (water level sensor + electric gate + controller) monitors and regulates the water level difference between the storage tank and the planting device in real time, driving water circulation through the water level difference and reducing pump energy consumption (100% energy saving compared to traditional pump drive systems).

[0045] This application provides an aquatic plant cultivation device, comprising: a buoyancy support 1 and a planting trough 2. The buoyancy support 1 is installed at the bottom of the planting trough 2, and the buoyancy support 1 and the planting trough 2 are assembled to form a vertically stacked structure. The buoyancy support 1 is formed by splicing multiple buoyancy modules 11 through an elastic splicing mechanism 12. The buoyancy modules 11 are hexagonal in shape, and the multiple buoyancy modules 11 are spliced ​​in a honeycomb pattern to form the buoyancy support 1. The planting trough 2 is formed by splicing multiple planting modules through an elastic splicing mechanism 12. The elastic splicing mechanism 12 enables dynamic deformation, solving the problem of cumbersome disassembly and reassembly of traditional threaded connections. One planting module corresponds to three or four buoyancy modules 11 to form an integrated load-bearing structure. The integrated load-bearing structure is stable and can withstand large water wave impacts.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An aquatic plant cultivation device, characterized in that, include: A buoyancy support and a planting trough, wherein the buoyancy support is installed at the bottom of the planting trough and the buoyancy support and the planting trough are assembled to form a vertically stacked structure; The buoyancy support is formed by splicing multiple buoyancy modules together through an elastic splicing mechanism. The buoyancy modules are hexagonal in shape, and multiple buoyancy modules are spliced ​​together in a honeycomb pattern to form the buoyancy support. The planting trough is composed of multiple planting modules connected by an elastic splicing mechanism. One planting module corresponds to three or four buoyancy modules to form an integrated load-bearing structure.

2. The aquatic plant cultivation device as described in claim 1, characterized in that, The bottom of the planting trough is provided with multiple water-permeable holes; the buoyancy support is a honeycomb porous structure, the upper holes of the porous structure near the bottom of the planting trough are arranged corresponding to the water-permeable holes at the bottom of the planting trough to form a vertical water flow channel, and the lower holes of the porous structure away from the bottom of the planting trough are offset from the upper holes and are connected to the external water body.

3. The aquatic plant cultivation device as described in claim 1, characterized in that, The buoyancy support includes a float, which has a double-layer hollow structure. The outer layer of the double-layer hollow structure is a high-density polyethylene shell, and the inner layer of the double-layer hollow structure is filled with biodegradable foamed particles. The top of the float integrates a water level sensing microcapsule. When the external water level exceeds a threshold, the sensing microcapsule ruptures and releases the foamed particle volume expansion agent, triggering adaptive buoyancy adjustment.

4. The aquatic plant cultivation device as described in claim 3, characterized in that, The buoyancy support has a magnetic positioning groove embedded in its buoyancy cylinder, and the planting trough is provided with a metal positioning part. The magnetic positioning groove of the buoyancy cylinder and the metal positioning part of the planting trough cooperate with each other to realize the quick assembly and disassembly of the buoyancy support and the planting trough.

5. The aquatic plant cultivation device as described in claim 1, characterized in that, The buoyancy support has multiple holes, which are distributed in a honeycomb pattern. The holes are hexagonal or circular, and the holes are connected to each other through staggered permeable holes to form a network.

6. The aquatic plant cultivation device as described in claim 1, characterized in that, Each planting module has a pre-drained array of permeable holes at its bottom, and permeable holes are provided between adjacent planting modules. The permeable holes are staggered to form a barrier against substrate loss.

7. The aquatic plant cultivation device as described in claim 1, characterized in that, The bottom of the planting trough is equipped with a root fixing net, the walls of the planting trough are made of biodegradable and environmentally friendly materials, and the substrate inside the planting trough is a mixed layer of expanded clay and peat moss.

8. The aquatic plant cultivation device as described in claim 1, characterized in that, The elastic splicing mechanism includes an elastic connecting rod and a telescopic sleeve. The elastic connecting rod is disposed inside the telescopic sleeve and can move relative to the telescopic sleeve. The buoyancy module or the planting module can rotate relative to each other in the horizontal plane by 0-30° through the elastic connecting rod. The length of the telescopic sleeve can be automatically adjusted with water level fluctuations.

9. The aquatic plant cultivation device as described in claim 8, characterized in that, The telescopic sleeve includes a first sleeve and a second sleeve. The second sleeve is telescopically fitted inside the first sleeve. An elastic connector is also provided between the second sleeve and the first sleeve. When subjected to the thrust of water waves, the elastic connector is stretched, and the length of the telescopic sleeve increases. When not subjected to the thrust of water waves, the elastic connector returns to its original position, and the length of the telescopic sleeve decreases.

10. A rainwater storage system, characterized in that, Including the aquatic plant cultivation device according to any one of claims 1-9, further comprising: The rainwater storage tank includes a primary water storage area and a secondary purification area. The primary water storage area is connected to the secondary purification area through a guide pipe, and a flow control valve is provided on the guide pipe. A water filtration layer is set between the rainwater storage tank and the aquatic plant planting device, and includes a gravel layer, an activated carbon layer and a biofilm carrier layer. The water level regulating device includes a water level sensor, an electric gate, and a controller. The controller regulates the water level difference between the prime number rainwater storage tank and the aquatic plant planting device based on the data from the water level sensor.