Method for cultivating plant-growing concrete seedlings of red sea olive

Abstract

The invention discloses a method for cultivating plant-growing concrete seedlings of red sea olive, which comprises the following steps of: fixing seeds of red sea olive in a plant-growing concrete seedling-growing tube, and then directly and vertically planting the plant-growing concrete seedling-growing tube on a field mud flat wetland for natural seedling cultivation. The vegetation concrete seedling raising pipe is formed by pouring seed germination concrete on the upper layer and seedling breeding concrete on the lower layer in the seedling raising pipe in a laminated mode. Wherein the seed germination concrete and the seedling breeding concrete are prepared from sea mud, sea sand, cement, seawater and fertilizer according to different dosage ratios. According to the method, the three functions of seed germination, seedling breeding and field planting application can be achieved in the same device, and the cultivation rate, the survival rate and the retention rate of the natural seedlings of the red sea olive can be remarkably increased.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering materials, and in particular relates to a method for cultivating red mangrove concrete seedlings. Background Art

[0002] China's mangroves are widely distributed in the intertidal zones of coastal tropical and subtropical harbors and estuaries in the southeast region. They have the functions of preventing wind and waves, promoting siltation and land reclamation, and purifying water quality. They are important habitats and breeding places for waterfowl, fish, shrimp, crabs and shellfish. Mangrove wetlands can store a large amount of organic carbon during sedimentation and have important ecological functions and values. However, the current survival rate of mangrove afforestation is low, which has damaged the ecological value of mangroves. To a certain extent, it has led to a series of ecological and economic problems such as a decrease in the output of economic organisms on tidal flats, continuous outbreaks of diseases in artificial aquaculture on tidal flats, serious red tide disasters, a surge in typhoon losses, and a reduction in tourism resources. Therefore, it is urgent to carry out mangrove afforestation.

[0003] The red mangrove is an evergreen tree or large shrub of the genus Rhododendron in the family Rhododendron. It has well-developed prop roots and is one of the preferred tree species for the ecological restoration of coastal mangroves in China. It is a mid-to-late succession tree species and is mostly distributed in the inner edge of mangroves. The red mangrove is not resistant to low temperatures and is naturally distributed in Hainan, Guangxi, Guangdong and southern Taiwan in my country, with the Jiulong River estuary in Fujian as the northern boundary of artificial introduction. The red mangrove can reach a maximum height of 8 to 10 meters in tropical Southeast Asia. The red mangrove has the characteristics of strong resistance to wind and waves, and is suitable for growing in intertidal zones with high salinity, as well as in estuaries with low salinity.

[0004] The red mangrove is a viviparous mangrove plant that reproduces sexually with seeds. The seed hypocotyl is cylindrical, 30 to 40 cm long, and has warty protrusions on the surface. If the mature red mangrove seed hypocotyls are not picked in time, they will naturally fall off and insert into the mud. If the environmental conditions of the falling place are suitable, the seed hypocotyls can take root and germinate in situ. However, due to the shade under the forest and the lack of soil nutrients, only a small number of seedlings were found to be able to grow. When the density is high, they grow poorly and cannot naturally complete the alternation of generations.

[0005] Traditional mangrove afforestation methods mainly include natural seed hypocotyl afforestation, natural viviparous seedling afforestation and artificial container seedling afforestation. Natural seed hypocotyl or viviparous seedling afforestation has problems such as slow seedling development and low seedling survival rate. Artificial container seedling afforestation has problems such as seedling transplanting process easily damaging the root system, resulting in low planting survival rate and low forest retention rate. Therefore, it is particularly necessary to develop new models of natural seed germination, seedling rapid propagation and planting of red mangrove. Summary of the invention

[0006] The purpose of the present invention is to provide a method for cultivating red mangrove seedlings in concrete, which is a new model for seed germination, rapid seedling propagation and planting application of natural red mangrove seedlings. It uses commonly available raw materials to prepare a structurally integrated and stable-performance concrete seedling tube, which is directly vertically planted on a wild tidal flat wetland to cultivate natural red mangrove seedlings. The three functions of seed germination, seedling propagation and planting application can be achieved in the same device, and the cultivation rate, survival rate and retention rate of natural red mangrove seedlings can be significantly improved.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A method for cultivating red mangrove seedlings in a planting concrete seedling tube is provided, and then the planting concrete seedling tube is directly and vertically inserted into a wild tidal flat wetland for natural seedling cultivation, so as to realize the trinity of seed germination, seedling breeding and planting application.

[0008] Specifically, the method for cultivating red mangrove seedlings in concrete is to first pour the slurry of seedling breeding concrete into the seedling tube, prepare the breeding layer by pre-growing the blank, and cure for 3 to 5 days. After the concrete hardens, the red mangrove seeds are put in and the hypocotyls are kept in a vertical state. Then, the seedling tube is filled with the slurry of seed germination concrete, prepare the germination layer by pre-growing the blank, and after continuing to solidify and cure for 7 to 14 days, an integrated structure of the vegetation concrete seedling tube is formed. The vegetation concrete seedling tube is directly and vertically inserted into the wild tidal flat wetland to carry out the natural seedling cultivation of red mangrove, and the three functions of seed germination, seedling breeding and planting application can be realized in the same device.

[0009] Furthermore, the seed germination concrete is composed of sea mud, sea sand, cement, sea water and fertilizer as raw materials, with a sand content of 25-80%, a water-cement ratio of 2.52-5.10, and based on the total weight of the sea mud and sea sand used, the cement content is 5.7-8.3%, and the fertilizer content is 1‰.

[0010] When the sand content is 25-80%, the cement content is 6.8%, and the water-binder ratio is 2.52-5.10, the porosity of the concrete is 23.99-35.79%, the compressive strength is 1.168-1.844 MPa, and the density is 1240-1507 kg / m 3 When the sand content is 25%, the water-binder ratio is 4.90, and the cement content is 5.7-8.3%, the porosity of the seed germination concrete is 32.39-34.35%, the compressive strength is 1.216-1.898 MPa, and the density is 1259-1291 kg / m 3 .

[0011] Furthermore, the seedling breeding concrete is also composed of sea mud, sea sand, cement, sea water and fertilizer as raw materials, with a sand content of 25~80%, a water-cement ratio of 2.52~5.10, and based on the total weight of the sea mud and sea sand used, the cement content is 5.6~9.2%, and the fertilizer content is 1.5‰.

[0012] When the sand content is 25-80%, the cement content is 6.8%, and the water-binder ratio is 2.52-5.10, the porosity of the concrete is 23.99-35.79%, the compressive strength is 1.168-1.844 MPa, and the density is 1240-1507 kg / m 3 When the sand content is 66.6%, the water-cement ratio is 3.50, and the cement content is 5.6-9.2%, the porosity of the seedling breeding concrete is 28.95-31.95%, the compressive strength is 1.165-2.469 MPa, and the density is 1522-1570 kg / m 3 .

[0013] Furthermore, in the seed germination concrete and the seedling propagation concrete, the particle sizes of the sea mud and sea sand are both 1.0-1.5 mm.

[0014] Furthermore, in the seed germination concrete and seedling propagation concrete, the cement is PS 42.5 slag silicate cement.

[0015] Furthermore, in the seed germination concrete and the seedling propagation concrete, the total nutrient content of the fertilizer is 32%, wherein the ratio of N, P2O5, and K2O is 16:10:6%.

[0016] Furthermore, the seedling tube is a tubular material with openings at both ends, an inner tube diameter of 18 to 22 cm, and a length that is three times the length of the embryonic axis of the red mangrove seeds, and is made of plastic, bamboo or metal.

[0017] Furthermore, in the obtained planting concrete seedling tube, the height ratio of the upper germination layer to the lower breeding layer is 1:7-8.

[0018] According to the characteristics of seed germination and seedling growth of red mangrove, the present invention develops seed germination concrete suitable for seed germination and seedling breeding concrete suitable for seedling growth, and casts the two in layers in a seedling tube. The planted concrete seedling tube constructed by the present invention has suitable strength and density, which can help the fixation and lodging resistance of seeds and seedlings, and prevent the loss of seedling substrate, seeds and seedlings; and the suitable porosity of concrete can improve the water permeability and air permeability of the substrate during seed germination, seedling breeding and planting application; adding fertilizer can make up for the deficiency of nitrogen, phosphorus and potassium in the substrate, and improve the specific growth rate and survival rate of seeds and seedlings; and the integrated structure of the concrete seedling tube can play a role in slowing down the scouring of sea waves and tides. The present invention is simple to operate, low in production cost, and can produce good social, ecological and economic benefits.

[0019] The beneficial effects of the present invention are: 1. The present invention is a new afforestation model that integrates natural seed germination, rapid propagation of container seedlings and field transplant-free planting. It can realize the three functions of seed germination, seedling propagation and planting application in the same seedling tube, and can significantly improve the cultivation rate, survival rate and retention rate of natural red sea olive seedlings.

[0020] 2. The present invention adjusts the sand content of concrete slurry so that it has the advantages of combined sandy soil and muddy soil, and can improve the water permeability and air permeability of the matrix; according to the nutritional requirements of red sea olive seedling cultivation, a fertilizer formula is designed using soil testing and fertilization technology, and the fertilizer is added to concrete to make up for the deficiency of nitrogen, phosphorus and potassium in the matrix, improve the nutritional structure of the matrix, and provide the red sea olive with a good habitat.

[0021] 3. The vegetation concrete seedling tube provided by the present invention can effectively improve the retention rate of red mangrove plants and protect the red mangrove plants planted on the tidal flats of coastal wetlands from being eroded by waves and eaten by aquatic animals. Its higher strength and greater density can play a role in slowing down the erosion of waves and tides.

[0022] 4. The suitable strength and density of the vegetation concrete of the present invention can effectively improve the fixation of the matrix, help the fixation and anti-lodging of seeds and seedlings, prevent the loss of matrix, seeds and seedlings, and avoid the red mangrove seeds and seedlings being washed away by waves due to periodic tidal scouring.

[0023] 5. The appropriate porosity of the vegetation concrete of the present invention can effectively improve the water permeability and air permeability of the matrix, and can effectively improve the efficiency of seed germination, seedling breeding and afforestation, avoiding the problem that the natural red mangrove seedlings are difficult to retain due to lack of oxygen and death of seedlings due to buried aerial roots and decreased water permeability and air permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a real picture of red mangrove seeds.

[0025] Figure 2 This is a real picture of red mangrove seedlings. DETAILED DESCRIPTION

[0026] A method for cultivating red mangrove concrete seedlings, which specifically comprises first pouring a slurry of seedling cultivation concrete into a seedling tube with an inner diameter of 18-22 cm and a length three times the length of the hypocotyl of a red mangrove seed, pre-cultivating a blank to obtain a breeding layer, curing for 3-5 days, and after the concrete hardens, putting a red mangrove seed and keeping its hypocotyl vertically standing on the soil surface, and then pouring a slurry of seed germination concrete in the seedling tube to obtain a germination layer, and after continuing to solidify and cure for 7-14 days, a planted concrete seedling tube with an integrated structure is formed, wherein the height ratio of the upper germination layer to the lower breeding layer is 1:7-8. The planted concrete seedling tube is directly and vertically inserted into a wild tidal flat wetland to cultivate natural red mangrove seedlings, and the three functions of seed germination, seedling breeding and planting application can be realized in the same device.

[0027] Among them, the seed germination concrete and seedling breeding concrete are both made of sea mud, sea sand, cement, sea water and fertilizer as raw materials. The sand content is 25~80%, the water-cement ratio is 2.52~5.10, and based on the total weight of the sea mud and sea sand used, the cement content of the seed germination concrete is 5.7~8.3%, and the fertilizer content is 1‰; the cement content of the seedling breeding concrete is 5.6~9.2%, and the fertilizer content is 1.5‰.

[0028] The particle sizes of the sea mud and sea sand are both 1.0-1.5 mm. The cement is PS 42.5 slag silicate cement. The total nutrient content of the fertilizer is 32%, wherein the ratio of N, P2O5, and K2O is 16:10:6%.

[0029] The material of the seedling tube is plastic, bamboo or metal.

[0030] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods, but the present invention is not limited thereto.

[0031] Raw material selection: The embryonic axis of the red mangrove seeds is columnar, 25~30 cm long, about 2~3 cm in diameter, and weighs about 20~25 g.

[0032] The cement used is PS 32.5 and PS 42.5 slag Portland cement.

[0033] The natural seawater comes from the seawater at the mouth of Jinjing Creek in Jinjiang Campus of Fuzhou University (salinity 20~33‰).

[0034] The natural sea mud was excavated from the mudflats under the natural mangrove community in Quanzhou Bay, Fujian Province. It was water-milled and screened to particle sizes of 0.25-0.5 mm, 0.5-1.0 mm, 1.0-1.5 mm and 1.5-2.0 mm, and then drained for later use.

[0035] The natural sea sand is ground by water, screened into particle sizes of 0.35~0.45 mm, 0.5~1.0 mm, 1.0~1.5 mm and 1.5~2.0 mm, and then drained and set aside.

[0036] The seedling medium is prepared with sea mud and / or sea sand in different proportions according to the sand content index requirements; the total nutrient content of the fertilizer is 32%, and it is compounded according to the N:P2O5:K2O ratio of 16:10:6%; the fertilizer dosage in seed germination concrete is 1.0‰, and the fertilizer dosage in seedling breeding concrete is 1.5‰ (both based on the weight of the seedling medium), which can be directly added or prepared into an aqueous solution for use.

[0037] Unless otherwise specified, the test methods are conventional methods in the field, such as referring to "CECS 361-2003 Technical Specification for Application of Vegetative Concrete" or "JGJ51-2002 Technical Specification for Lightweight Aggregate Concrete". When performing the performance test, the concrete is demoulded after 28 days of standard curing and made into standard test blocks with a specification of 100 mm×100 mm×100 mm for testing.

[0038] Germination rate (%): refers to the percentage of germinated seeds to the number of valid tested seeds, and statistics begin when the cotyledon opening angle reaches 60°.

[0039] Specific growth rate (cm / d): Calculated from the time when two true leaves grow after the seeds germinate, according to the following formula: , Where: V - specific growth rate (cm / d); h 1 - Initial plant height (cm); h 2 - Final plant height (cm); t 2 -t 1 - Plant growth time difference (d).

[0040] Example 1 Effect of particle size and sand content on concrete performance According to the formula in Table 1-3, sea mud and sea sand were mixed with cement for 1 minute respectively, and then sea water was added and stirred until uniform to make concrete slurry, which was then poured into a container. After pre-forming into a blank under normal temperature and pressure conditions for 1 day, concrete was obtained, and after standard curing for 28 days, it was demolded and tested for performance.

[0041] Table 1 Effect of sea mud particle size on concrete performance

[0042] As can be seen from Table 1, when PS 32.5 slag silicate cement is used, the cement content is 7.5% and the water-binder ratio is 4.6, as the sea mud particle size increases, the porosity of the concrete increases, but the compressive strength and density decrease. When the sea mud particle size is 0.25~2.0mm, the porosity of the concrete is 22.36~32.60% and the density is 1105~1320 kg / m 3 , which can preliminarily meet the porosity and density performance requirements of seedling cultivation concrete, but the compressive strength performance needs to be further improved.

[0043] Table 2 Effect of sea sand particle size on concrete performance

[0044] It can be seen from Table 2 that when PS 32.5 slag silicate cement is used, the cement content is 6.0% and the water-binder ratio is 3.0, as the sea sand particle size increases, the porosity of the concrete increases, but the compressive strength and density decrease. When the sea sand particle size is 0.35~2.0 mm, the porosity of the concrete is 26.01~37.93%, the compressive strength is 1.042~1.438 MPa, and the density is 1286~1536 kg / m 3 , which can initially meet the requirements of seedling cultivation concrete. In order to further improve the performance of concrete, PS 42.5 slag silicate cement was used in subsequent experiments.

[0045] Table 3 Effect of sand content and water-cement ratio on concrete performance

[0046] As can be seen from Table 3, compared with the lower porosity and compressive strength of the control example, the porosity and compressive strength of the concrete prepared by preparing sea mud and sea sand into seedling medium at a sand content of 25-80% and solidifying with cement are significantly improved. When the sand content is 25-80%, the cement content is 6.8%, and the water-binder ratio is 2.52-5.10, the porosity of the concrete is 23.99-35.79%, the compressive strength is 1.168-1.844 MPa, and the density is 1240-1507 kg / m 3 , which can meet the requirements of seedling cultivation concrete.

[0047] Example 2 Preparation of seed germination concrete and its performance effects According to the formula in Table 4, sea mud, sea sand and cement were stirred for 1 minute, and then sea water was added and stirred until uniform to form concrete slurry, which was then poured into a container. After pre-growing the blanks under normal temperature and pressure for 1 day, seed germination concrete was obtained, and after standard curing for 28 days, the concrete was demoulded and the performance was tested.

[0048] Table 4 Effect of cement content on the performance of seed germination concrete

[0049] As can be seen from Table 4, compared with the lower porosity and compressive strength of the control example, the porosity, compressive strength and density of the concrete prepared by preparing sea mud and sea sand into seedling medium with a sand content of 25% and solidifying with cement are significantly improved with the increase of cement content. When the sand content is 25%, the cement content is 5.7~8.3%, and the water-cement ratio is 4.90, the porosity of the concrete is 32.39~34.35%, the compressive strength is 1.216~1.898 MPa, and the density is 1259~1291 kg / m 3 , which can meet the requirements of upper seed germination concrete.

[0050] Example 3 Preparation of seedling breeding concrete and its performance effects According to the formula in Table 5, sea mud, sea sand and cement were stirred for 1 minute, and then sea water was added and stirred until uniform to form concrete slurry, which was then poured into a container. After pre-growing the blanks under normal temperature and pressure for 1 day, seedling breeding concrete was obtained, which was demolded after 28 days of standard curing for performance testing.

[0051] Table 5 Effect of cement content on the performance of seedling breeding concrete

[0052] As can be seen from Table 5, compared with the lower porosity and compressive strength of the control example, the porosity, compressive strength and density of the concrete prepared by preparing sea mud and sea sand into seedling matrix at a sand content of 66.6% and solidifying with cement are significantly improved with the increase of cement content. When the sand content is 66.6%, the cement content is 5.6~9.2%, and the water-cement ratio is 3.50, the porosity of the concrete is 28.95~31.95%, the compressive strength is 1.165~2.469 MPa, and the density is 1522~1570 kg / m 3 , which can meet the requirements of concrete for breeding seedlings in the lower layer.

[0053] Example 4 Application of Planting Concrete Seedling Tube Seedling propagation concrete slurry and seed germination concrete slurry were prepared according to the formula in Table 6, and then the seedling propagation concrete slurry was first poured into a seedling tube with an inner diameter of 18-22 cm and a length of 3 times the length of the hypocotyl of the red mangrove seed, and the pre-cultivated blank was used to obtain a propagation layer under normal temperature and pressure conditions, and the curing was carried out for 3-5 days. After the concrete hardened, a red mangrove seed was put in and its hypocotyl was kept vertically on the soil surface, and then the seed germination concrete slurry was poured in layers in the seedling tube, and the pre-cultivated blank was used to obtain a germination layer under normal temperature and pressure conditions. After further curing and curing for 7-14 days, an integrated structure of the planted concrete seedling tube was formed, and the planted concrete seedling tube was directly inserted into the tidal flat wetland at the estuary of Jinjing Creek in Jinjiang Campus of Fuzhou University to cultivate natural seedlings of red mangrove, so as to realize the three functions of seed germination, seedling propagation and planting application.

[0054] Table 6 Effects of vegetated concrete seedling tubes on the specific growth rate and survival rate of Rhizophora mangrove seedlings

[0055] As can be seen from Table 6, when the sea mud and sea sand were not solidified with cement, the specific growth rate and survival rate of the red sea olive seedlings were low; adding fertilizers can make up for the lack of nitrogen, phosphorus and potassium in the seedling medium and improve the specific growth rate and survival rate of the seedlings (control examples 1 and 2). The concrete conditions of the germination layer: sand content 25%, water-cement ratio 4.9, cement content 7.2%, fertilizer content 1.0‰, the concrete conditions of the breeding layer: sand content 66.6%, water-cement ratio 3.50, cement content 6.8%, fertilizer content 1.5‰, the prepared vegetation concrete seedling tube, the specific growth rate of the red sea olive seedlings can reach 0.189 cm / d, the survival rate can reach 100%, and the effect is the best.

[0056] Example 5 Effect of the Germination Layer / Growth Layer Height Ratio on the Germination Rate and Loss Rate of Seed Embryonic Axes According to the optimal concrete conditions obtained in Example 4, seedling breeding concrete slurry and seed germination concrete slurry were prepared respectively, and then the seedling breeding concrete slurry was first poured into a seedling tube with an inner diameter of 18-22 cm and a length of 3 times the length of the hypocotyl of the red mangrove seed, and the pre-cultivated blank was used to obtain a breeding layer under normal temperature and pressure conditions, and the breeding layer was cured for 3-5 days. After the concrete hardened, a red mangrove seed was placed and its hypocotyl was kept upright on the soil surface, and then the seed germination concrete slurry was poured in layers in the seedling tube, and the pre-cultivated blank was used to obtain a germination layer under normal temperature and pressure conditions. After continued solidification and curing for 7-14 days, an integrated structure of the planted concrete seedling tube was formed, and the germination layer / breeding layer height ratio was set according to Table 7. The planted concrete seedling tube was then directly inserted into the tidal flat wetland at the estuary of Jinjing Creek, Jinjiang Campus, Fuzhou University, to cultivate natural seedlings of red mangrove, so as to investigate the influence of the height ratio on the germination rate and loss rate of the seed hypocotyl.

[0057] Table 7 Effect of the height ratio of the germination layer / breeding layer on the germination rate and loss rate of seed embryo axes

[0058] As shown in Table 7, when the height ratio of the germination layer / breeding layer is within the range of 1:7-8, the seeds of the red mangrove can be well fixed in the vegetation concrete seedling tube, avoiding being washed away by the waves due to periodic tidal erosion, and it has good water permeability and air permeability and can meet the nutritional needs of the red mangrove, so it has a higher seed germination rate. When the height ratio is too large, the seeds are more fixed by the concrete, which can help the fixation and lodging resistance of the seeds, prevent the loss of the seedling medium and seeds, but will lead to a decrease in the seed germination rate; when the height ratio is too low, the seeds are less fixed by the concrete, and the seed loss rate increases.

[0059] Example 6 Comparison of planting methods for cultivating natural seedlings of red mangroves Seedling breeding concrete slurry and seed germination concrete slurry were prepared respectively according to the optimal concrete conditions obtained in Example 4, and then the seedling breeding concrete slurry was first poured into a seedling tube with an inner diameter of 18-22 cm and a length of 3 times the length of the hypocotyl of the red mangrove seed, and the pre-cultivated blank was prepared under normal temperature and pressure to obtain a breeding layer, which was cured for 3-5 days. After the concrete hardened, a red mangrove seed was put in and its hypocotyl was kept upright on the soil surface, and then the seed germination concrete slurry was poured in layers in the seedling tube, and the pre-cultivated blank was prepared under normal temperature and pressure to obtain a germination layer. After continuing to solidify and cure for 7-14 days, an integrated structure of the planted concrete seedling tube (whose germination layer / breeding layer height ratio was 1:8) was formed, and then the planted concrete seedling tube was used for afforestation on three tidal flats, high, medium and low, in the sea area of ​​the "Blue Bay" ecological protection and restoration area of ​​Quanzhou Bay, and three groups of red mangrove seeds were directly planted for comparison. The results are shown in Table 8.

[0060] Table 8 Effects of different tidal zone planting methods on the retention rate of red mangrove seedlings

[0061] It can be seen from Table 8 that compared with direct planting of red mangrove seeds for afforestation, planting red mangrove seeds in concrete seedling tubes can effectively improve the retention rate of red mangrove seedlings.

[0062] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for cultivating red mangrove seedlings in concrete, characterized in that: The red mangrove seeds are fixed in a planting concrete seedling tube, and then the planting concrete seedling tube is directly and vertically inserted into a wild tidal flat wetland for natural seedling cultivation; The planting concrete seedling raising tube is made by pouring the seed germination concrete of the upper layer and the seedling propagation concrete of the lower layer in the seedling raising tube in layers.

2. The method for cultivating red mangrove seedlings in concrete according to claim 1, characterized in that: The seed germination concrete is made of sea mud, sea sand, cement, sea water and fertilizer as raw materials, with a sand content of 25-80% and a water-cement ratio of 2.52-5.

10. Based on the total weight of the sea mud and sea sand used, the cement content is 5.7-8.3% and the fertilizer content is 1‰.

3. The method for cultivating red mangrove seedlings in concrete according to claim 1, characterized in that: The seedling breeding concrete is made of sea mud, sea sand, cement, sea water and fertilizer as raw materials. Its sand content is 25-80%, and the water-cement ratio is 2.52-5.

10. Based on the total weight of the sea mud and sea sand used, the cement content is 5.6-9.2%, and the fertilizer content is 1.5‰.

4. The method for cultivating red mangrove seedlings in concrete according to claim 2 or 3, characterized in that: The particle sizes of the sea mud and sea sand are both 1.0-1.5 mm, and the cement is PS 42.5 slag silicate cement; the total nutrient content of the fertilizer is 32%, among which the ratio of N, P2O5 and K2O is 16:10:6%.

5. The method for cultivating red mangrove seedlings in concrete according to claim 1, characterized in that: Specifically, the slurry of seedling breeding concrete is first poured into the seedling tube to prepare the breeding layer, which is cured for 3 to 5 days. After the concrete hardens, the red mangrove seeds are put in and the hypocotyls are kept in a vertical state. The seedling tube is then filled with the slurry of seed germination concrete to prepare the germination layer. After continued solidification and curing for 7 to 14 days, an integrated structure of the vegetation concrete seedling tube is formed. The vegetation concrete seedling tube is directly and vertically inserted into the wild tidal flat wetland to realize the natural seedling cultivation of red mangrove.

6. The method for cultivating red mangrove seedlings in concrete according to claim 5, characterized in that: The seedling tube is a tubular material with two openings at both ends, an inner tube diameter of 18 to 22 cm, and a length three times the length of the embryonic axis of the red mangrove seeds. The material is plastic, bamboo or metal.

7. The method for cultivating red mangrove seedlings in concrete according to claim 5, characterized in that: The height ratio of the upper germination layer to the lower breeding layer is 1:7~8.

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