Method for beautifying and purifying eutrophicated landscape water body by using tulip floating bed

Abstract

The application discloses a method for beautifying and purifying eutrophic landscape water bodies by using tulip floating beds, and comprises the following steps: selecting water-cultivated tulip varieties; inducing roots of tulip bulbs and inducing aquatic roots; removing the seed coat and lateral buds of the selected tulip bulbs, and performing indoor root induction treatment after conventional disinfection; placing the tulip bulbs with induced aquatic roots on a planting disc, and then placing the planting disc at a floating bed planting hole; performing conventional management on the tulips after planting; and placing the floating bed in the eutrophic landscape water body. The application establishes a tulip outdoor water body floating bed planting technology taking the eutrophic water body as a nutrient salt library. Compared with the prior art, the method can make the tulips quickly absorb nitrogen, phosphorus and other nutrient elements in the landscape water body during the seedling stage, flowering stage and bulb growth stage, is beneficial to reducing the eutrophication degree of the water body, reducing the operation cost of the plant floating bed technology, fixing carbon and reducing emissions, and achieves the purpose of purifying and beautifying the landscape water body.

Description

Technical Field

[0001] This invention belongs to the field of cultivation technology, and relates to the cultivation of tulips, and more particularly to a method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds. Background Technology

[0002] With the increasing demands for living environments, the ecological environment of landscape water bodies, primarily urban rivers, park lakes, and residential water features, is receiving growing attention. Aquatic plants are the most important materials for creating garden water features, not only beautifying the water bodies but also purifying and improving water quality. As urban construction continues to develop and improve, more and more aquatic plant species (varieties) are being used in landscape water features. Traditional aquatic plants can no longer meet the needs of innovation and change in garden construction, and among the currently used traditional aquatic plants, there are relatively few winter-green varieties. Through a survey of the application of aquatic plants in rivers, lakes, and residential water features in major cities in East China, the applicant found that very few aquatic plants can remain green and flower in winter and spring; the vast majority of aquatic plants are withered in winter and early spring, leaving the water surface desolate. Floating plant bed technology is an effective nitrogen and phosphorus purification technology for water bodies and has been widely used both domestically and internationally. Current research on using floating bed plants to treat eutrophication mainly focuses on dominant aquatic plants suitable for spring and summer growth, with very little research and application of symbiotic aquatic and terrestrial flowering plants that possess both high ornamental value and tolerance to low winter and spring temperatures. Although the water quality of landscape water bodies is relatively good during winter and spring due to lower temperatures, most landscape water bodies currently suffer from varying degrees of eutrophication due to their generally poor flow and weak self-purification capacity. Utilizing eutrophic water bodies as a bioremediation resource in winter and spring through floating bed planting of aquatic plants that offer both water purification and high ornamental value would be of great significance for promoting the ornamental plant industry and expanding its resource utilization.

[0003] The root system is a vital organ for plants to absorb nutrients such as water, nitrogen, and phosphorus. The quantity and health of the root system directly affect the vitality of the entire plant. Tulips, belonging to the genus Tulipa in the family Liliaceae, are perennial herbaceous plants and are autumn-planted bulbous flowers with good cold resistance. They are beloved for their unique flower shape and vibrant colors. Currently, they are widely used in urban greening, rural beautification, and themed flower exhibitions, mainly through soil cultivation or greenhouse substrate cultivation. However, due to limitations in the rapid induction and domestication technology of their aquatic roots and the lack of supporting floating bed planting systems, there are currently no reports of using floating beds for hydroponic tulip cultivation in eutrophic landscape water bodies during the winter and spring seasons. The applicant's previous research indicates that the key to successful hydroponics of tulips lies in the induction of aquatic roots in the bulbs and their good early root growth and development. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds. This invention utilizes a floating plant bed planting system and the induction of aquatic roots in the bulbs, along with their early root growth and development. This allows tulips to rapidly absorb nutrients such as nitrogen and phosphorus from the landscape water body during the seedling, flowering, and bulb growth stages, thus reducing eutrophication, lowering the operating costs of the floating plant bed technology, and achieving carbon sequestration and emission reduction, ultimately purifying and beautifying the landscape water body. Furthermore, it innovates a method for forcing outdoor tulip hydroponic cut flower cultivation in eutrophic landscape water bodies, providing technical support for the ecological restoration and resource utilization of eutrophic landscape water bodies during the winter and spring seasons.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for beautifying and purifying eutrophic water bodies using tulip floating beds, the method comprising:

[0007] 1) Selection of tulip varieties for hydroponics;

[0008] 2) Rooting treatment and aquatic root induction of tulip bulbs: Remove the seed coat and lateral buds from the selected tulip bulbs, and carry out indoor rooting treatment after routine disinfection;

[0009] 3) Between December and January of the following year, place the tulip bulbs with induced aquatic roots onto the planting tray, and then place the planting tray at the planting hole of the floating bed, ensuring that the aquatic roots of the bulbs are submerged in water and the root plate is level with the water surface.

[0010] 4) Perform routine management of tulips after planting;

[0011] The floating beds are placed in eutrophic landscape water bodies.

[0012] As a preferred embodiment of the present invention, in step 1), the hydroponic tulip varieties include early-flowering or mid-flowering varieties such as World Love, Pure Gold, Apollo Essence, Dow Jones, or Golden Apollo.

[0013] As a preferred embodiment of the present invention, in step 2), the root-inducing treatment is as follows: tulip bulbs are buried in the mixed substrate to a depth of 2 / 3 of the bulb, and root-inducing treatment is carried out in a dark environment at 5-9 ℃. When the roots grow to 0.5-1.5 cm in length, they are taken out from the mixed substrate.

[0014] As a preferred embodiment of the present invention, in step 2), the method for inducing aquatic roots is as follows: the tulip bulbs after root-inducing treatment are placed in a hydroponic nutrient solution with an EC value of 0.28-0.40 and a pH value of 6.3-6.8 for aquatic root induction treatment, and then hydroponically cultured indoors at 8℃-12℃ for 7-10 days until the roots have completed the early stage of growth and development.

[0015] As a preferred embodiment of the present invention, in step 3), the floating bed includes a polyethylene plastic plate with a fixing rod, a solar cell array and an oxygenation system. Planting holes are provided on the polyethylene plastic plate every 8-10 cm, and a detachable planting tray is provided at each planting hole. The planting tray is used to fix the tulip bulbs.

[0016] As a preferred embodiment of the present invention, the planting tray includes a base plate and a cover plate. The inner plane of the base plate has 3-5 semi-ellipsoidal planting holes evenly distributed, and the inner plane of the cover plate has 3-5 raised semi-ellipsoidal planting holes distributed in the same position as the base plate. The specific number of planting holes depends on the size of the bulb.

[0017] As a preferred embodiment of the present invention, a fixing structure is provided at the contact point between the planting tray and the floating bed, a protrusion is provided on the side of the floating bed, and a buckle is provided on the side of the planting tray, wherein the protrusion and the buckle can engage with each other.

[0018] As a preferred embodiment of the present invention, the top of the cover plate is provided with a first through hole, and the bottom of the base plate is provided with a second through hole.

[0019] In a preferred embodiment of the present invention, in step 4), the water temperature during planting is 0℃-25℃, the pH value is 5.5-9.0, and the dissolved oxygen in the landscape water is controlled to be greater than 5.0 mg / L. -1 .

[0020] As a preferred embodiment of the present invention, the mixed matrix is ​​vermiculite and perlite in a mass ratio of 4:1.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention utilizes the climatic characteristics of the Jiangnan region to establish an outdoor floating bed cultivation technology for tulips, using eutrophic water bodies as nutrient reservoirs. Compared with existing technologies, this technology not only allows tulips to rapidly absorb nutrients such as nitrogen and phosphorus from the landscape water body during the seedling, flowering, and bulb growth stages, thus reducing eutrophication and lowering the operating costs of the floating bed technology, but also achieves carbon sequestration and emission reduction, ultimately purifying and beautifying the landscape water body. Furthermore, it innovates a method for forcing outdoor tulip hydroponic cut flower cultivation using eutrophic landscape water bodies, providing technical support for the ecological restoration and resource utilization of eutrophic landscape water bodies during the winter and spring seasons. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the hexagonal single-unit floating bed of the present invention.

[0024] Figure 2 This is a side view of the single hexagonal floating bed of the present invention.

[0025] Figure 3 This refers to the effect of different hydroponic nutrient solution formulations on the root elongation of tulips.

[0026] Figure 4 This study investigates the effects of different hydroponic nutrient solution formulations on tulip root growth.

[0027] Figure 5 This study investigated the effects of different hydroponic nutrient solution formulations on the root vitality of tulip bulbs.

[0028] Figure 6 This study investigated the effects of different hydroponic nutrient solution formulations on the mitotic index of root tip tissue in hydroponic tulip bulbs.

[0029] Figure 7 This study investigated the effects of different hydroponic nutrient solution formulations on the total amount of soluble salts absorbed by the roots of tulip bulbs.

[0030] Figure 8 This is a schematic diagram of the square single-unit floating bed of the present invention.

[0031] Figure 9 This invention relates to floating bed tulips during their peak blooming period.

[0032] In the diagram, 1. Floating bed; 2. Planting tray; 3. Base plate; 4. Cover plate; 5. Protrusion; 6. Buckle; 7. First through hole; 8. Second through hole. Implementation

[0033] To facilitate understanding of the technical means, creative features, objectives, and effects of this invention, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the scope of protection of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0034] See Figure 1 , Figure 2 as well as Figure 8 The floating bed system used in this invention is composed of interconnected individual floating beds, and each individual floating bed is hexagonal (e.g., Figure 1 (as shown) or square (such as) Figure 8As shown, patterns can be created by densely arranging mortise and tenon joints or screws, or by using an array of mortise and tenon joints or screws.

[0035] The single floating bed includes a main body of floating bed 1, and the surface of floating bed 1 is provided with multiple through holes for placing planting trays 2, such as... Figure 1 As shown, the surface of the single floating bed is provided with 7 through holes for placing the planting tray 2.

[0036] The main body is made of polyethylene plastic sheet, on which a solar cell array (not shown in the figure) and an oxygenation system (not shown in the figure) are installed. Both the solar cell array and the oxygenation system are existing technologies and will not be described in detail below.

[0037] like Figure 2 As shown, a fixing device is provided at the position where the planting tray 2 contacts the floating bed 1. The fixing device includes a protrusion 5 provided on the edge of the floating bed 1 and a buckle 6 provided on the edge of the planting tray 2. The planting tray 2 is fixed on the floating bed 1 by the engagement of the protrusion 5 and the buckle 6.

[0038] The planting tray 2 includes 3-5 semi-elliptical bulb planting holes 3 and 3-5 semi-elliptical cover trays 4. The bottom of the base tray 3 is provided with a second through hole 8, and the top of the cover tray 4 is provided with a first through hole 7.

[0039] The second through hole 8 allows the roots of the tulip bulbs to contact the water surface at the bottom of the floating bed 1.

[0040] The first through hole 7 facilitates the extension of the tulip stem and improves the stability of the entire planting tray, preventing the tulip plants from tipping over in strong winds.

[0041] This invention relates to a method for beautifying and purifying eutrophic water bodies using tulip floating beds, comprising:

[0042] 1) Selection of tulip varieties for hydroponics;

[0043] 2) Rooting treatment and aquatic root induction of tulip bulbs: Remove the seed coat and lateral buds from the selected tulip bulbs, and carry out indoor rooting treatment after routine disinfection;

[0044] 3) Between December and January of the following year, place the tulip bulbs with induced aquatic roots onto the planting tray, and then place the planting tray at the planting hole of the floating bed, ensuring that the aquatic roots of the bulbs are submerged in water and the root plate is level with the water surface.

[0045] 4) Perform routine management of tulips after planting;

[0046] The floating beds are placed in eutrophic landscape water bodies. Example

[0047] Selection of Tulip Varieties for Hydroponics: Select early-flowering and mid-flowering tulip varieties suitable for hydroponic forcing cultivation, such as World Love, Pure Gold, Apollo Essence, Dow Jones, and Golden Apollo. The following uses the mid-flowering tulip variety World Love as the experimental material to explain the implementation process.

[0048] Indoor root-inducing treatment experiment of tulip bulbs

[0049] Twelve medium-flowering Dutch tulip bulbs of the variety "World's True Love," suitable for forcing cultivation and treated at 5 ℃, with a bulb circumference of 12-14 cm, were selected. Before planting, the yellowish-brown outer skin of the bulbs was removed. Before sowing, the bulbs were routinely disinfected by soaking them in an 800-fold diluted solution of 75% carbendazim powder for 30 minutes. After drying, bulbs with approximately the same circumference were selected for root-promoting treatment.

[0050] Place an 8cm thick layer of expanded clay pebbles at the bottom of a 100L plastic storage box. Use a 4:1 mixture of unused vermiculite and perlite as the rooting substrate (based on the preliminary experimental results of the rooting substrate selection, see Table 1 for specific experimental results). Before use, thoroughly water the mixed substrate, then spread it evenly on the expanded clay pebbles layer to a thickness of 8-10cm. Bury the tulip bulbs in the mixed substrate to a depth of about 2 / 3 of the bulb's length. Perform rooting treatment in a dark environment at 5-9℃, ensuring good ventilation during rooting. When the roots reach a length of 0.5-1.5cm, remove them from the mixed substrate and carefully wash the mixed substrate off the root surface with running water, taking care to avoid damaging the roots during washing.

[0051] Table 1. Effects of different root-promoting substrates on the germination of new roots from tulip bulbs.

[0052]

[0053] Table 1 shows that the rate of new root germination in tulips is related to the rooting substrate. Perlite resulted in the fastest root germination, while conventional rooting treatment in water resulted in the slowest root germination. Considering the time required for new root germination and the average root length and number of long roots on day 5, a 4:1 mixture of vermiculite and perlite showed the best rooting effect. Therefore, this study used a 4:1 mixture of vermiculite and perlite as the rooting substrate for tulips.

[0054] Tulip bulbs can be rooted in a dark environment at 5-9℃ for 3-5 days. New roots will sprout from the bulb's root plate. On the 5th day, 85% of the tulip bulbs will have a root length of about 0.5-1.5 cm, which can meet the requirements for subsequent aquatic root induction. Example

[0055] Induction and domestication of tulip aquatic root systems

[0056] Based on the screening experiments of different nutrient solution formulas (see Table 2), a hydroponic nutrient solution stock solution containing nitrogen, phosphorus, potassium, calcium, magnesium, boron, and cerium as the main nutrients was prepared, with the following concentrations: calcium nitrate 50 mmol / L, potassium nitrate 20 mmol / L, potassium dihydrogen phosphate 12 mmol / L, magnesium sulfate 2 mmol / L, boric acid 4 mmol / L, and cerium 10 mmol / L. Before use, the stock solution was diluted accordingly to achieve an EC value of 0.28-0.40 and a pH value of 6.3-6.8. The bulbs were hydroponically cultured at 8-12 ℃ for one week until the roots reached 5-10 cm in length, at which point the tulip bulbs were planted in outdoor landscape water features.

[0057] Table 2. Effects of different hydroponic nutrient solutions on tulip root growth after 7 days of hydroponics.

[0058]

[0059] Note: Formula D is the hydroponic solution formula for indoor tulip-forcing hydroponics, which is published in the inventor's patent (application number: 201610785285.3). Example

[0060] Effects of different nutrient solution formulations on the growth and development of tulip aquatic roots

[0061] Roots are vital organs for plants to absorb water and nutrients. The quantity and development of roots directly affect the overall vitality of the plant and its ability to absorb nutrients from water. To understand the effects of different hydroponic nutrient solution formulations on tulip root growth and development, root elongation (ΔL), root activity, total water-soluble salt absorption by roots, and root tip mitotic index were measured at 8-12 ℃ for 3, 6, and 10 days of hydroponics. The results are shown in the table below. Figure 3 and Figure 4 In the figure, different lowercase letters in the data for the same day indicate significant differences between the processing methods. P<0.05 ), identical lowercase letters indicate no significant difference between treatments. P > 0.05 ), n=8. A is Miracle Grove general-purpose hydroponic nutrient solution, B is homemade hydroponic nutrient solution; C is 1 / 2 Hoglund general-purpose nutrient solution.

[0062] During the hydroponic cultivation of tulips, all experimental groups showed the most rapid root growth in the first 10 days, mainly manifested as root elongation. After 3 weeks of hydroponics, the root system matured. However, different nutrient solution formulations had varying effects on root growth rate and root vigor (see...). Figure 5 The effects are different. (By) Figure 3It can be seen that, compared with nutrient solution formula A (1 / 2 Hoglund general nutrient solution), nutrient solution formula B (homemade hydroponic nutrient solution 1) showed the fastest root growth. Throughout the hydroponic period, its root elongation was significantly greater than that of nutrient solution formula A and nutrient solution formula C (Miracle Grove hydroponic plant general nutrient solution). P<0.05 The root elongation of tulip bulbs in nutrient solution formula C treatment group was significantly higher than that in nutrient solution formula A treatment group at 3 days. P<0.05 At 6 and 10 days, the root elongation of the tulip was not significantly different from that of the nutrient solution formulation A treatment group. It is speculated that in the early stage of tulip root growth, the root growth is sensitive to nutrient salt concentration, but it can gradually adapt to its environment in the later stage.

[0063] Depend on Figure 5 It can be seen that after 6 and 10 days of hydroponic cultivation of tulip bulbs, the root activity of the nutrient solution formula B treatment group was significantly higher than that of the nutrient solution formula A and nutrient solution formula C treatment groups. P<0.05 The root activity of nutrient solution formula A was inhibited after 10 days of hydroponics, and was significantly lower than that of nutrient solution formulas B and C.

[0064] Depend on Figure 6 It can be seen that different nutrient solution formulations have different effects on the mitotic index of tulip bulb root tip meristem cells after 6 days of hydroponics. Among them, the mitotic index of tulip root tip tissue in the hydroponic nutrient solution formulation B group was the most vigorous, and its mitotic index was significantly higher than that of nutrient solution formulations A and C. P<0.05 Nutrient solution formula C and nutrient solution formula A showed no significant difference. The experimental results indicate that hydroponic nutrient solution formula B can promote mitosis of cells in the root tip meristem of tulips and promote rapid root growth.

[0065] Depend on Figure 7 It can be seen that, compared with hydroponic nutrient solution formula A, the total amount of soluble salt absorbed by the tulip roots in the hydroponic nutrient solution formula B treatment group was significantly greater than that in the other two nutrient solution formula treatment groups, which is presumably related to its higher root activity. Example

[0066] Experiment on the effect of hydroponic tulips on nitrogen and phosphorus removal in eutrophic water bodies

[0067] Floating bed plants are the most important component of a floating bed system, and the appropriateness of plant selection is a crucial factor affecting the effectiveness of floating bed purification technology. This study used tulips with induced aquatic roots as a novel aquatic floating bed plant, and conducted experiments using an indoor static test method to simulate outdoor water quality, following the method described in the literature (Liu et al., 2021). Using 1 / 4 nitrogen- and phosphorus-free Hoagland nutrient solution as the base solution, test water bodies were prepared with potassium nitrate, calcium nitrate, and potassium dihydrogen phosphate to simulate the water quality of eutrophic outdoor water bodies. Initially, the total nitrogen (TN) and total phosphorus (TN) were 4.0 mg·L⁻¹. -1 0.15 mg·L -1 (The nitrogen and phosphorus concentrations were based on the average nitrogen and phosphorus content in the main eutrophic landscape water bodies in Shaoxing City during winter.) Floating bed cultivation devices containing 10 plants were placed in plastic tanks filled with 100L of test water, with a blank control group included. Each treatment was repeated in three replicates. The experiment was conducted from January 28, 2022 to March 15, 2022 in a ventilated greenhouse at the school, with water temperatures ranging from 8 to 22℃, for a duration of 45 days. The results are shown in Table 3. Table 3 shows that tulips have a good removal effect on nitrogen and phosphorus in eutrophic landscape water bodies.

[0068] Table 3. Removal rate of nitrogen and phosphorus from eutrophic waters by tulips

[0069]

[0070] To further investigate the growth and carbon fixation / oxygen release capacity of three novel floating bed plants in outdoor eutrophic landscape water bodies, the three plants underwent rapid induction and acclimatization of their aquatic root systems. From January 21, 2022 to March 2022, a planting experiment was conducted again at Luomen Park, using aquatic irises as a control group. Relevant indicators were measured according to the methods described in the literature (Li Xin, 2015; Pan Baobao, 2013). The specific plant growth status before and after the experiment can be found in [link to relevant data]. Figure 2 The relevant growth indicators and carbon sequestration and oxygen release are shown in Table 4.

[0071] Application of tulips in outdoor eutrophic landscape water bodies and determination of their carbon sequestration and oxygen release capacity

[0072] To further investigate the growth and carbon sequestration and oxygen release capacity of tulips in outdoor eutrophic landscape water bodies, tulip bulbs of varieties named "World Love" and "Pure Gold," after induction and domestication of aquatic roots, were planted on floating beds in Luomen Park, Yuecheng District, Shaoxing City from January 21, 2022 to March 2022. Aquatic irises were used as a control group. Relevant indicators were measured according to the methods described in the literature (Li Xin. 2015. Evaluation of Carbon Sequestration and Oxygen Release Capacity and Vigor of Common Aquatic Plants in Tianjin [D]. Nankai University; Pan Baobao. 2013. Study on Carbon Storage of Aquatic Plant Communities in Hongze Lake Wetland [D]. Nanjing Forestry University). Relevant growth indicators and carbon sequestration and oxygen release are shown in Table 4, and relevant cut flower traits are shown in Table 5. The specific plant growth status after the experiment is shown in [Table 5]. Figure 9 .

[0073] Table 4. Growth and carbon sequestration / oxygen release of tulips in eutrophic water bodies.

[0074]

[0075] Table 4 shows that tulips can grow and develop rapidly in the eutrophic water bodies of Luomen Park, with higher growth rate, carbon sequestration, and oxygen release than aquatic irises. Compared to aquatic irises, which remain green in winter and spring but grow slowly at low temperatures, tulips have better carbon sequestration and oxygen release capabilities in winter and spring.

[0076] Table 5. Main trait indicators of tulip cut flowers grown in eutrophic water bodies

[0077]

[0078] As shown in Table 5, both Tulip World Love and Tulip Pure Gold, grown in floating beds, can bloom in eutrophic water bodies. According to the literature (Wen Yuting, Study on the Preservation Effect and Mechanism of Different Plant Growth Regulators on Tulip Cut Flowers [D]. Henan Agricultural University), their cut flower indicators all meet the first-class cut flower standard for commercial cut flowers.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for beautifying and purifying eutrophic water bodies using tulip floating beds, characterized in that, The method includes: 1) Selection of hydroponic tulip varieties; 2) Rooting treatment and aquatic root induction of tulip bulbs: Remove the seed coat and lateral buds from the selected tulip bulbs, and carry out indoor rooting treatment after routine disinfection; 3) Between December and January of the following year, place the tulip bulbs with induced aquatic roots onto the planting tray, and then place the planting tray at the planting hole of the floating bed, ensuring that the aquatic roots of the bulbs are submerged in water and the root plate is level with the water surface. 4) After planting, tulips should be managed routinely; the floating beds should be placed in eutrophic landscape water bodies. In step 2), the root-inducing treatment is as follows: Tulip bulbs are buried in the mixed substrate to a depth of 2 / 3 of the bulb, and root-inducing treatment is carried out in a dark environment at 5-9℃. When the roots grow to 0.5-1.5cm in length, they are taken out of the mixed substrate. In step 2), the method for inducing aquatic roots is as follows: the tulip bulbs after root-inducing treatment are placed in a hydroponic nutrient solution with an EC value of 0.28-0.40 and a pH value of 6.3-6.8 to induce the growth of aquatic roots. After 7-10 days of indoor hydroponic cultivation at 8℃-12℃, when the roots have completed the early growth and development and the roots are 5-10cm long, the tulip bulbs are planted in outdoor landscape water bodies. The stock solution for hydroponic nutrient solution contains 50 mmol / L calcium nitrate, 20 mmol / L potassium nitrate, 12 mmol / L potassium dihydrogen phosphate, 2 mmol / L magnesium sulfate, 4 mmol / L boric acid, and 10 mmol / L cerium. The stock solution should be diluted accordingly before use. The mixed matrix is ​​vermiculite and perlite in a mass ratio of 4:1; In step 1), the hydroponic tulip varieties are early-flowering or mid-flowering varieties suitable for forcing cultivation, including World Love, Pure Gold, Apollo Essence, Dow Jones, and Golden Apollo.

2. The method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds according to claim 1, characterized in that, In step 3), the floating bed includes multiple polyethylene plastic plates with fixing rods, solar cell arrays and oxygenation system. Planting holes are provided every 8-10 cm on the polyethylene plastic plates, and a detachable planting tray is provided at each planting hole. The planting tray is used to fix the tulip bulbs.

3. The method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds according to claim 2, characterized in that, The planting tray includes a base plate and a cover plate. The inner plane of the base plate has 3-5 semi-ellipsoidal planting holes evenly distributed, and the inner plane of the cover plate has 3-5 raised semi-ellipsoidal planting holes distributed in the same position as the base plate.

4. The method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds according to claim 3, characterized in that, The planting tray has a fixing structure at the contact point with the floating bed, a protrusion is provided on the side of the floating bed, and a buckle is provided on the side of the planting tray. The protrusion and the buckle can be engaged with each other.

5. A method for beautifying and purifying eutrophic water bodies using tulip floating beds according to claim 3, characterized in that, The top of the cover plate is provided with a first through hole, and the bottom of the base plate is provided with a second through hole.

6. A method for beautifying and purifying eutrophic landscape water bodies using tulip floating beds according to claim 1, characterized in that, In step 4), the water temperature during planting should be 0℃-25℃, the pH value 5.5-9.0, and the dissolved oxygen in the landscape water body should be controlled to be greater than 5.0 mg·L⁻¹. -1 .

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