Vegetation concrete seedling culture device for bruguiera gymnorrhiza seedling culture and application method thereof

Abstract

The invention discloses a vegetation concrete seedling culture device for bruguiera gymnorrhiza seedling culture and an application method thereof, and the seedling culture device is formed by pouring upper-layer seed germination concrete and lower-layer seedling breeding concrete in a same container in a laminated manner, the upper seed germination layer concrete is composed of sea mud, sea sand, cement, seawater and fertilizer as raw materials, and the lower seedling breeding concrete is composed of sea sand, cement, seawater and fertilizer as raw materials. The seedling raising device is directly and vertically planted on a field mud flat wetland, natural seedlings of bruguiera gymnorrhiza can be cultivated, 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 bruguiera gymnorrhiza 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 planting concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings and an application method thereof. 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] Bruguiera gymnorrhiza, also known as chicken claw wave, pruning, big head olive, chicken claw olive, is an evergreen tree or large shrub of the genus Bruguiera in the family Rhizophoraceae. It has well-developed knee-shaped breathing roots, sometimes with prop roots and plate-like roots. It is one of the preferred tree species for the ecological restoration of coastal mangroves in China. It is a late succession tree species and is mostly distributed near the high tide line at the inner edge of mangroves. Bruguiera gymnorrhiza can reach a maximum height of 30m in tropical Southeast Asia and a maximum height of 10-12m in China. Bruguiera gymnorrhiza has the characteristics of strong wind and wave resistance, and is suitable for growing in intertidal zones with high salinity as well as in estuaries with low salinity. Bruguiera gymnorrhiza is not resistant to low temperatures and is naturally distributed in Hainan, Guangxi, Guangdong, Hong Kong and southern Fujian in my country. Yunxiao, Fujian is the northern boundary of its natural distribution in my country, and the estuary of Jiulong River in Fujian is the northern boundary of artificial introduction. Bruguiera gymnorrhiza is a marine medicinal plant. Because its hypocotyl and bark have potential medicinal value and have the effects of treating fever, diarrhea, eye diseases, and stopping bleeding, wild Bruguiera gymnorrhiza is often stolen.

[0004] Bruguiera gymnorrhiza is a viviparous mangrove plant that reproduces sexually with seeds. The seed hypocotyl is columnar, 15 to 25 cm long, cigar-shaped, and blunt at the top. If the mature Bruguiera gymnorrhiza seed hypocotyl is not picked in time, it will naturally fall off and insert into the mud. If the environmental conditions of the falling place are suitable, the seed hypocotyl 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 can be found to grow. When the density is high, the seedlings 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 Bruguiera gymnorrhiza. Summary of the invention

[0006] The purpose of the present invention is to provide a vegetation concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings and an application method thereof, which is a new model for seed germination, seedling rapid propagation and planting application of natural Bruguiera gymnorrhiza seedling cultivation. The vegetation concrete seedling raising device with integrated structure and stable performance is prepared by using commonly available raw materials, which is directly vertically planted on a wild tidal flat wetland for cultivating natural Bruguiera gymnorrhiza seedlings. The three functions of seed germination, seedling propagation and planting application can be realized in the same device, and the cultivation rate, survival rate and retention rate of natural Bruguiera gymnorrhiza seedlings can be significantly improved.

[0007] To achieve the above object, the present invention adopts the following technical solution: A planting concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings is made by pouring an upper layer of seed germination concrete and a lower layer of seedling propagation concrete in the same container in layers.

[0008] 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 5.6-9.2%, and the fertilizer content is 0.4‰.

[0009] Furthermore, the particle sizes of the sea mud and sea sand are both 1.0-1.5 mm.

[0010] Furthermore, the cement is PF 42.5 fly ash silicate cement.

[0011] Furthermore, the total nutrient content of the fertilizer is 31%, of which N, P 2 O 5 , K 2 The ratio of O is 16:10:5%.

[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 23.03-34.35%, the compressive strength is 1.216-1.921 MPa, and the density is 1291-1570 kg / m 3When the sand content is 33.3%, the water-binder ratio is 4.72, and the cement content is 5.6-9.2%, the porosity of the seed germination concrete is 30.77-33.97%, the compressive strength is 0.978-2.072 MPa, and the density is 1333-1375 kg / m 3 .

[0013] Furthermore, the seedling breeding concrete is composed of sea sand, cement, seawater and fertilizer as raw materials, and its water-cement ratio is 2.5~5.0. Based on the weight of the sea sand used, the cement content is 5.25~9.33%, and the fertilizer content is 0.8‰.

[0014] Furthermore, the particle size of the sea sand is 0.5~1.0 mm.

[0015] Furthermore, the cement is PS 32.5 Portland slag cement.

[0016] Furthermore, the total nutrient content of the fertilizer is 31%, of which N, P 2 O 5 , K 2 The ratio of O is 16:10:5%.

[0017] When the water-cement ratio is 2.5-5.0 and the cement content is 6.25%, the porosity of the concrete for seedling breeding is 27.99-32.25%, the compressive strength is 1.027-1.522 MPa, and the density is 1419-1489 kg / m 3 When the water-binder ratio is 3.0 and the cement content is 5.25-9.33%, the porosity of the seedling breeding concrete is 22.69-32.26%, the compressive strength is 1.324-2.795 MPa, and the density is 1450-1568 kg / m 3 .

[0018] The method for cultivating Bruguiera gymnorrhiza seedlings by using the planting concrete seedling raising device comprises the following steps: firstly pouring slurry of seedling breeding concrete into a seedling raising tube, pre-growing blanks to obtain a breeding layer, curing for 3 to 5 days, and after the concrete hardens, placing Bruguiera gymnorrhiza seeds and keeping their embryo axes in a vertical state, and then pouring slurry of seed germination concrete into the seedling raising tube to obtain a germination layer by pre-growing blanks, and continuing to solidify and cure for 7 to 14 days to form a planting concrete seedling raising device with an integrated structure, and directly vertically inserting the planting concrete seedling raising device into a wild tidal flat wetland to cultivate natural seedlings of Bruguiera gymnorrhiza, and the three functions of seed germination, seedling breeding and planting application can be realized in the same seedling raising device.

[0019] Furthermore, the seedling tube is a tubular container with openings at both ends, an inner tube diameter of 13 to 16 cm, and a length that is 2.5 times the length of the embryonic axis of the Bruguiera gymnorrhiza seed.

[0020] Furthermore, the material of the seedling tube is one of plastic, bamboo or metal.

[0021] Furthermore, in the planting concrete seedling raising device, the height ratio of the upper germination layer to the lower breeding layer is 1:5-6.

[0022] According to the characteristics of Bruguiera gymnorrhiza seed germination and seedling growth, 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 seedling incubator 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 incubator 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.

[0023] 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 raising device, and can significantly improve the cultivation rate, survival rate and retention rate of natural Bruguiera gymnorrhiza seedlings.

[0024] 2. The present invention adjusts the sand content of the seed germination 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 Bruguiera gymnorrhiza seedling cultivation, a fertilizer formula is designed using soil testing and fertilization technology, and the fertilizer formula is added to the concrete, which can make up for the deficiency of nitrogen, phosphorus and potassium in the matrix, improve the nutritional structure of the matrix, and provide a good habitat for Bruguiera gymnorrhiza.

[0025] 3. The vegetation concrete nursery provided by the present invention can effectively improve the retention rate of Bruguiera gymnorrhiza plants and protect Bruguiera gymnorrhiza plants planted on coastal wetland tidal flats from being scoured by waves and eaten by aquatic animals. Its higher strength and greater density can play a role in slowing down the scouring by waves and tides.

[0026] 4. The appropriate 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 seeds and seedlings of Bruguiera gymnorrhiza being washed away by waves due to periodic tidal scouring.

[0027] 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 propagation and afforestation, avoiding the problem that the seedlings die of lack of oxygen due to the burial of aerial roots and the decrease of water permeability and air permeability, which makes it difficult to retain the natural seedlings of Bruguiera gymnorrhiza. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a real picture of Bruguiera gymnorrhiza seeds.

[0029] Figure 2 This is a real picture of Bruguiera gymnorrhiza seedlings. DETAILED DESCRIPTION

[0030] A method for cultivating Bruguiera gymnorrhiza seedlings using a planting concrete seedling raising device comprises the following steps: 1) Mix sea mud, sea sand, cement, sea water and fertilizer to make seed germination concrete slurry, the sand content of which is 25-80%, the water-cement ratio is 2.52-5.10, and the cement content is 5.6-9.2% and the fertilizer content is 0.4‰ based on the total weight of the sea mud and sea sand used; 2) Mix sea sand, cement, sea water and fertilizer to make seedling breeding concrete slurry, with a water-cement ratio of 2.5-5.0, and based on the weight of the sea sand used, the cement content is 5.25-9.33%, and the fertilizer content is 0.8‰; 3) First, pour the seedling propagation concrete slurry into a seedling tube with an inner diameter of 13-16 cm and a length 2.5 times the length of the embryonic axis of the Bruguiera gymnorrhiza seed, pre-grow the blank to obtain the propagation layer, and cure it for 3-5 days. After the concrete hardens, put a Bruguiera gymnorrhiza seed and keep its embryonic axis vertically on the soil surface, and then pour the seed germination concrete slurry in the seedling tube to prepare the germination layer. After continuing to solidify and cure for 7-14 days, an integrated structure of the planted concrete seedling device is formed, in which the height ratio of the upper germination layer to the lower propagation layer is 1:5-6. The planted concrete seedling device is directly vertically inserted into the wild tidal flat wetland to cultivate natural seedlings of Bruguiera gymnorrhiza.

[0031] Wherein, the particle size of the sea mud and sea sand in step 1) is 1.0-1.5 mm. The cement is PF 42.5 fly ash silicate cement. The total nutrient content of the fertilizer is 31%, of which N, P 2 O 5 , K 2 The ratio of O is 16:10:5%.

[0032] Step 2) The particle size of the sea sand is 0.5-1.0 mm. The cement is PS 32.5 slag silicate cement. The total nutrient content of the fertilizer is 31%, of which N, P 2 O 5 , K2 The ratio of O is 16:10:5%.

[0033] Step 3) The seedling tube is made of one of plastic, bamboo or metal.

[0034] 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.

[0035] Raw material selection: The embryonic axis of Bruguiera gymnorrhiza seeds is columnar, 18~24 cm long, about 3~4 cm in diameter, and weighs about 30 g.

[0036] The cement used is PS 32.5 slag silicate cement and PF 42.5 fly ash silicate cement.

[0037] The natural seawater comes from the seawater at the estuary of Jinjing Creek in Jinjiang Campus of Fuzhou University (salinity 20~33‰).

[0038] 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.

[0039] 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.

[0040] 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 31%, according to the N:P 2 O 5 :K 2 O are compounded in a ratio of 16:10:5%; the fertilizer dosage in seed germination concrete is 0.4‰ (based on the weight of the seedling medium), and the fertilizer dosage in seedling propagation concrete is 0.8‰ (based on the weight of the seedling medium). It can be added directly or prepared into an aqueous solution for use.

[0041] 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.

[0042] 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°.

[0043] Specific growth rate (cm / d): Calculated from the time when two true leaves grow after germination, 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).

[0044] Example 1 Effect of particle size and sand content on concrete performance According to the formula in Tables 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 the blanks under normal temperature and pressure for 1 day, concrete was obtained. After standard curing for 28 days, the concrete was demoulded and the performance was tested.

[0045] Table 1 Effect of sea sand particle size on concrete performance

[0046] As can be seen from Table 1, when the water-binder ratio is 3.0 and the cement content is 6.0%, as the particle size of sea sand increases, the porosity of concrete increases, but the compressive strength and density decrease. When the particle size of sea sand is 0.35~2.0 mm, the porosity of 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.

[0047] Table 2 Effect of sea mud particle size on concrete performance

[0048] As can be seen from Table 2, when PS 32.5 slag silicate cement is used, the water-binder ratio is 4.6 and the cement content is 7.5%, 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 0.25~2.0 mm, the porosity of the concrete is 22.36~32.60%, and the density is 1105~1320kg / m 3 , which can initially meet the porosity and density requirements of seedling cultivation concrete, but the compressive strength performance needs to be further improved. In order to improve the compressive strength performance of concrete, PF 42.5 fly ash silicate cement was used for subsequent experiments.

[0049] Table 3 Effect of sand content and water-cement ratio on the performance of seed germination concrete

[0050] 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 obtained by using sea mud and sea sand as raw materials at a sand content of 25-80% and curing with cement are significantly improved. When the sand content is 25-80%, the cement content is 6.8%, and the water-cement ratio is 2.52-5.10, the porosity of the concrete is 23.03-34.35%, the compressive strength is 1.216-1.921 MPa, and the density is 1291-1570 kg / m 3 , which can meet the requirements of seedling cultivation and seed germination concrete.

[0051] 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.

[0052] Table 4 Effect of cement content on the performance of seed germination concrete

[0053] 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 made by using sea mud and sea sand as raw materials and curing with cement at a sand content of 33.3% are significantly improved with the increase of cement content. When the sand content is 33.3%, the water-binder ratio is 4.72, and the cement content is 5.6~9.2%, the porosity of the concrete is 30.77~33.97%, the compressive strength is 0.978~2.072 MPa, and the density is 1333~1375 kg / m 3 , which can meet the requirements of upper seed germination concrete.

[0054] Example 3 Preparation of seedling breeding concrete and its performance effects According to the formula in Table 5, 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.

[0055] Table 5 Effect of water-cement ratio on the performance of seedling breeding concrete

[0056] As can be seen from Table 5, compared with the lower porosity and compressive strength of the control example, the porosity and compressive strength of the concrete obtained after the sea sand was solidified with cement were significantly improved, while the density did not change much. When the water-cement ratio was 2.5-5.0 and the cement content was 6.25%, the porosity of the concrete was 27.99-32.25%, the compressive strength was 1.027-1.522 MPa, and the density was 1419-1489 kg / m 3 , which can meet the requirements of concrete for breeding seedlings in the lower layer.

[0057] Table 6 Effect of cement content on the performance of seedling breeding concrete

[0058] As can be seen from Table 6, compared with the lower porosity and compressive strength and higher density of the control example, after the sea sand is solidified with cement, as the cement content increases, the strength and porosity of the concrete are significantly improved, and the density is significantly reduced. When the water-cement ratio is 3.0 and the cement content is 5.25~9.33%, the porosity of the concrete is 22.69~32.26%, the compressive strength is 1.324~2.795MPa, and the density is 1450~1568 kg / m 3 , which can meet the requirements of concrete for breeding seedlings in the lower layer.

[0059] Example 4 Application of Planting Concrete Seedling Raising Device According to the formula in Table 7, the seedling breeding concrete slurry and the seed germination concrete slurry were prepared respectively, and then the seedling breeding concrete slurry was first poured into a plastic tube with an inner diameter of 13-16 cm and a length of 2.5 times the length of the embryonic axis of the Bruguiera gymnorrhiza 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 Bruguiera gymnorrhiza seed was put in and its embryonic axis was kept standing 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 plant concrete seedling maker was formed, and the plant concrete seedling maker was directly and vertically inserted into the tidal flat wetland at the estuary of Jinjing Creek in Jinjiang Campus of Fuzhou University to cultivate natural seedlings of Bruguiera gymnorrhiza, so as to realize the three functions of seed germination, seedling breeding and planting application.

[0060] Table 7 Effects of the planted concrete nursery on the specific growth rate and survival rate of Bruguiera gymnorrhiza seedlings

[0061] As can be seen from Table 7, when the sea mud and sea sand were not solidified with cement, the specific growth rate and survival rate of Bruguiera gymnorrhiza 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 33.3%, water-cement ratio 4.72, cement content 8%, fertilizer content 0.4‰, the concrete conditions of the breeding layer: water-cement ratio 3.0, cement content 6.25%, fertilizer content 1.0‰, the prepared vegetation concrete seedling jar, the specific growth rate of Bruguiera gymnorrhiza seedlings can reach 0.165 cm / d, the survival rate can reach 100%, and the effect is the best.

[0062] 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 plastic tube with openings at both ends, an inner diameter of 13-16 cm, and a length of 2.5 times the length of the hypocotyl of the Bruguiera gymnorrhiza seed, and a pre-growing 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 Bruguiera gymnorrhiza seed was placed and its hypocotyl was kept standing on the soil surface, and then the seed germination concrete slurry was poured in layers in the seedling tube, and the pre-growing blank was prepared under normal temperature and pressure to obtain a germination layer. After continued solidification and curing for 7-14 days, an integrated structure of the plant concrete seedling raising device was formed, and the germination layer / breeding layer height ratio was set according to Table 8. The plant concrete seedling raising device was then directly and vertically inserted into the tidal flat wetland at the estuary of Jinjing Creek, Jinjiang Campus, Fuzhou University to cultivate natural seedlings of Bruguiera gymnorrhiza, so as to investigate the influence of the height ratio on the germination rate and loss rate of the seed hypocotyl.

[0063] Table 8 Effect of the height ratio of the germination layer / breeding layer on the germination rate and loss rate of seed embryo axes

[0064] As shown in Table 8, when the height ratio of the germination layer / breeding layer is within the range of 1:5-6, the seeds of Bruguiera gymnorrhiza can be well fixed in the vegetation concrete seedling tube, avoiding being washed away by the periodic tidal scouring and the waves, and it has good water permeability and air permeability and can meet the nutritional needs of Bruguiera gymnorrhiza, 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 seeds to be fixed and resist lodging, and prevent the loss of the seedling medium and seeds, but it 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.

[0065] Example 6 Comparison of planting methods for cultivating natural seedlings of Bruguiera gymnorrhiza 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 plastic tube with an inner diameter of 13-16 cm and a length of 2.5 times the length of the embryonic axis of the Bruguiera gymnorrhiza seed, which was opened at both ends, and the pre-growing blank was used to obtain a breeding layer under normal temperature and pressure conditions, and cured for 3-5 days. After the concrete hardened, a Bruguiera gymnorrhiza seed was placed and its embryonic axis was kept standing on the soil surface, and then the seed germination concrete slurry was poured in layers in the seedling tube, and the pre-growing 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 raising device (whose germination layer / breeding layer height ratio was 1:6) was formed, and then the planted concrete seedling raising device 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 Bruguiera gymnorrhiza seeds were directly planted for comparison. The results are shown in Table 9.

[0066] Table 9 Effects of different tidal zone planting methods on the survival rate of Bruguiera gymnorrhiza seedlings

[0067] As can be seen from Table 9, compared with direct planting of Bruguiera gymnorrhiza seeds for afforestation, planting in concrete seedling raising devices can effectively improve the retention rate of Bruguiera gymnorrhiza seedlings.

[0068] 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 concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings, characterized in that: The planting concrete seedling raising device is made by pouring the seed germination concrete of the upper layer and the seedling propagation concrete of the lower layer in the same container.

2. The concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings according to claim 1, characterized in that: 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 5.6-9.2%, and the fertilizer content is 0.4‰; wherein the particle sizes of the sea mud and sea sand are both 1.0-1.5 mm, and the cement is PF 42.5 fly ash silicate cement; the total nutrient content of the fertilizer is 31%, and the ratio of N, P2O5, and K2O is 16:10:5%.

3. The plantation concrete seedling raising device for cultivating Bruguiera gymnorrhiza seedlings according to claim 1, characterized in that: The seedling breeding concrete is composed of sea sand, cement, seawater and fertilizer as raw materials, with a water-cement ratio of 2.5-5.0, and based on the weight of the sea sand used, the cement content is 5.25-9.33%, and the fertilizer content is 0.8‰; wherein the particle size of the sea sand is 0.5-1.0 mm, the cement is PS 32.5 slag silicate cement, the total nutrient content of the fertilizer is 31%, and the ratio of N, P2O5, and K2O is 16:10:5%.

4. A method for cultivating Bruguiera gymnorrhiza seedlings using the planted concrete seedling raising device as claimed in claim 1, characterized in that: 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, put the Bruguiera gymnorrhiza seeds and keep their hypocotyls in a vertical state. Then, pour the slurry of seed germination concrete in the seedling tube, prepare the germination layer by pre-growing the blank, and continue to solidify and cure for 7 to 14 days to form an integrated structure of the vegetation concrete seedling device. The vegetation concrete seedling device is directly and vertically inserted into the wild tidal flat wetland to realize the natural seedling cultivation of Bruguiera gymnorrhiza.

5. The method according to claim 4, characterized in that: The seedling tube is a tubular container with openings at both ends, an inner tube diameter of 13-16 cm, and a length 2.5 times the length of the embryonic axis of Bruguiera gymnorrhiza seeds.

6. The method according to claim 4 or 5, characterized in that: The material of the seedling tube is one of plastic, bamboo or metal.

7. The method according to claim 4, characterized in that: In the planting concrete seedling raising device, the height ratio of the upper germination layer to the lower breeding layer is 1:5-6.

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