Vegetation concrete seedling raising pipe for kandelia candel seedling cultivation and application method thereof

Abstract

The invention discloses a vegetation concrete seedling-raising pipe for kandelia candel seedling cultivation and an application method thereof, the vegetation concrete seedling-raising pipe is formed by successively stacking and pouring lower-layer seedling breeding concrete and upper-layer seed germination concrete in a seedling-raising pipe, the seed germination concrete is prepared from sea mud, cement, seawater and fertilizer as raw materials, and the seedling breeding concrete is prepared from sea mud, sea sand, cement, seawater and fertilizer as raw materials. The vegetation concrete seedling raising pipe can be directly and vertically inserted and planted on a field mud flat wetland to cultivate natural seedlings of kandelia candel, 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 kandelia candel 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 vegetation concrete seedling tube for cultivating Kandelia candel 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] Kandelia ovata, also known as water pen, is an evergreen shrub or small tree of the Kandelia genus of the Rhizophoraceae family. It has underdeveloped plank-like roots or prop roots. It is the most widely used mangrove plant species for coastal ecological restoration and tidal flat greening in China. It belongs to the early and middle successional tree species and is mostly distributed in the middle and outer edges of mangrove communities. Kandelia ovata is the most cold-resistant mangrove plant in my country. It is mainly distributed in the coastal intertidal zone south of Wenzhou, Zhejiang. The northern boundary of its natural distribution is Fuding City, Fujian Province (27°20ʹN), and the northern boundary of its artificial introduction is Yueqing, Zhejiang (28°25ʹN). Kandelia ovata can reach a maximum height of 8 to 10 meters in tropical areas of Southeast Asia. It is suitable for growing in intertidal zones with higher salinity and in estuaries with lower salinity.

[0004] Kandelia candel is a viviparous mangrove plant that reproduces sexually by seeds. The flowering period is from May to October, and the fruit ripening period is from September to November. The seed hypocotyl is slender, about 15 to 30 cm, and weighs about 10 g. The hypocotyl of mature Kandelia candel seeds is green. If not picked in time, the hypocotyl 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 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 Kandelia candel. Summary of the invention

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

[0007] To achieve the above object, the present invention adopts the following technical solution: A vegetation concrete seedling raising tube for cultivating Kandelia candel seedlings is formed by successively pouring seedling breeding concrete of a lower layer and seed germination concrete of an upper layer in the seedling raising tube in layers.

[0008] Furthermore, the seedling breeding concrete is composed of sea mud, sea sand, cement, seawater and fertilizer as raw materials, with a sand content of 25~75%, a water-cement ratio of 2.76~5.10, 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‰.

[0009] Furthermore, the particle size of the sea mud is 1.0~1.5 mm.

[0010] Furthermore, the particle size of the sea sand is 0.5~1.0 mm.

[0011] Furthermore, the cement is PS 42.5 Portland slag cement.

[0012] Furthermore, the total nutrient content of the fertilizer is 25%, of which N, P 2 O 5 , K 2 The ratio of O is 8:8:9%.

[0013] When the sand content is 25-75%, the water-cement ratio is 2.76-5.10, and the cement content is 6.8%, the porosity of the seedling breeding concrete is 27.13-32.98%, the compressive strength is 1.267-1.888 MPa, and the density is 1345-1589 kg / m 3 When the sand content is 50%, the water-cement ratio is 3.57, and the cement content is 5.6-9.2%, the porosity of the seedling breeding concrete is 29.25-32.29%, the compressive strength is 1.112-2.356 MPa, and the density is 1452-1498 kg / m 3 .

[0014] Furthermore, the seed germination concrete is composed of sea mud, cement, sea water and fertilizer as raw materials, and its water-cement ratio is 2.6-4.6; based on the weight of the sea mud used, the cement content is 5.0-7.0%, and the fertilizer content is 0.5‰.

[0015] Furthermore, the particle size of the sea mud is 1.0~1.5 mm.

[0016] Furthermore, the cement is PS 42.5 Portland slag cement.

[0017] Furthermore, the total nutrient content of the fertilizer is 25%, of which N, P 2 O 5 , K 2 The ratio of O is 8:8:9%.

[0018] When the cement content is 7.0% and the water-binder ratio is 2.6-4.6, the porosity of the seed germination concrete is 24.48-34.21%, the compressive strength is 1.111-1.858 MPa, and the density is 1129-1425 kg / m 3 When the cement content is 5.0-7.0% and the water-binder ratio is 3.6, the porosity of the seed germination concrete is 28.49-29.62%, the compressive strength is 1.108-1.592 MPa, and the density is 1295-1316 kg / m 3 .

[0019] Furthermore, the seedling tube is a bamboo tube, a plastic tube or a metal tube with openings at both ends, an inner tube diameter of 10 to 12 cm, and a length that is twice the length of the embryonic axis of the Kandelia candel seed.

[0020] The method for cultivating Kandelia candel seedlings by using the vegetation concrete seedling tube is as follows: firstly, slurry of seedling cultivation concrete is poured into the seedling tube, a breeding layer is obtained by pre-growing the blanks, and the cultivation is carried out for 3 to 5 days; after the concrete is hardened, Kandelia candel seeds are placed and their embryo axes are kept in a vertical state; then, slurry of seed germination concrete is poured into the seedling tube to form a germination layer by pre-growing the blanks; after further solidification and curing for 7 to 14 days, a vegetation concrete seedling tube with an integrated structure is formed; the vegetation concrete seedling tube is directly and vertically inserted into a wild tidal flat wetland, and natural Kandelia candel seedlings can be cultivated; and the three functions of seed germination, seedling breeding and planting application can be realized in the same seedling raising device.

[0021] Furthermore, in the vegetation concrete seedling tube, the height ratio of the upper germination layer to the lower breeding layer is 1:3~4.

[0022] According to the characteristics of Kandelia candel 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 raising device 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 raising matrix, seeds and seedlings; and the suitable porosity of concrete can improve the water permeability and air permeability of the matrix during seed germination, seedling breeding and planting application; adding fertilizer can make up for the deficiency of nitrogen, phosphorus and potassium in the matrix, and improve the specific growth rate and survival rate of seeds and seedlings; and the integrated structure of the concrete seedling raising 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.

[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 Kandelia candel seedlings.

[0024] 2. The present invention adjusts the sand content of the seedling breeding concrete slurry to make it combine the advantages of sandy soil and muddy soil, and can improve the water permeability and air permeability of the seedling medium; according to the nutritional requirements of Kandelia candel seedling cultivation, the soil testing and fertilization technology is used to design a fertilizer formula, and the fertilizer is added to the vegetation concrete, which can make up for the deficiency of nitrogen, phosphorus and potassium in the seedling medium, improve the nutritional structure of the seedling medium, and provide Kandelia candel with a good habitat.

[0025] 3. The vegetation concrete seedling tube provided by the present invention can effectively improve the retention rate of Kandelia candel plants and protect Kandelia candel plants planted on the tidal flats of coastal wetlands 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 Kandelia candel 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, improve the efficiency of seed germination, seedling breeding and afforestation, and avoid 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 Kandelia candel seedlings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a real picture of Kandelia candel seeds.

[0029] Figure 2 This is a real picture of Kandelia candel seedlings. DETAILED DESCRIPTION

[0030] A method for cultivating Kandelia candel seedlings using a vegetation concrete seedling tube, comprising the following steps: 1) Mix sea mud, sea sand, cement, sea water and fertilizer to make seedling breeding concrete slurry, with a sand content of 25-75%, a water-cement ratio of 2.76-5.10, 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‰; 2) Mix sea mud, cement, sea water and fertilizer to make seed germination concrete slurry, with a water-cement ratio of 2.6-4.6, and based on the weight of the sea mud used, the cement content is 5.0-7.0% and the fertilizer content is 0.5‰; 3) First, pour the seedling propagation concrete slurry into a seedling tube with an inner diameter of 10-12 cm and a length twice the length of the embryonic axis of the Kandelia candel seed, pre-grow the blank to obtain the propagation layer, and cure for 3-5 days. After the concrete hardens, put a Kandelia candel seed and keep its embryonic axis vertically on the soil surface, and then pour the seed germination concrete slurry into the seedling tube to prepare the germination layer. After continuing to solidify and cure for 7-14 days, an integrated structure of vegetation concrete seedling tube is formed, in which the height ratio of the upper germination layer to the lower propagation layer is 1:3-4. The vegetation concrete seedling tube is directly inserted vertically into the wild tidal flat wetland for natural seedling cultivation of Kandelia candel.

[0031] Wherein, the particle size of the sea mud in step 1) is 1.0-1.5 mm. The particle size of the sea sand is 0.5-1.0 mm. The cement is PS42.5 slag silicate cement. The total nutrient content of the fertilizer is 25%, N, P 2 O 5 , K 2 The ratio of O is 8:8:9%.

[0032] The particle size of the sea mud in step 2) is 1.0-1.5 mm. The cement is PS 42.5 slag silicate cement. The total nutrient content of the fertilizer is 25%, N, P 2 O 5 , K 2 The ratio of O is 8:8:9%.

[0033] The seedling tube in step 3) can be a bamboo tube, a plastic tube or a metal tube.

[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 Kandelia candel seeds is columnar, 15-20 cm long, about 2-3 cm in diameter, and weighs about 10 g.

[0036] The cement used is PS 42.5 slag 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 25%, according to the N:P 2 O 5 :K 2 O are compounded in a ratio of 8:8:9%; the fertilizer content in seedling breeding concrete is 1‰, and the fertilizer content in seed germination concrete is 0.5‰ (both based on the weight of seedling medium). It can be directly added 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 Vegetation Concrete" or "JGJ51-2002 Technical Specification for Lightweight Aggregate Concrete". During 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 of sea mud and sea sand on concrete performance According to the formulations in Tables 1 and 2, sea mud or sea sand of different particle sizes were mixed with cement for 1 minute, and then seawater was added and stirred until uniform to make concrete slurry, which was then poured into a container. Concrete was obtained after pre-forming the blanks for 1 day under normal temperature and pressure conditions, and was demolded after 28 days of standard curing for performance testing.

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

[0046] As can be seen from Table 1, 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 0.5~2.0 mm, the porosity of the concrete is 28.76~32.60%, and the density is 1105~1268 kg / 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, PS 42.5 slag silicate cement can be used in subsequent experiments.

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

[0048] As can be seen from Table 2, 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.

[0049] Example 2 Preparation of seed germination concrete and its performance effects According to the formula in Tables 3 and 4, sea mud 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.

[0050] Table 3 Effect of water-cement ratio on the performance of seed germination concrete

[0051] As shown in Table 3, when the cement content is 7.0% and the water-binder ratio is 2.6-4.6, the porosity of the concrete is 24.48-34.21%, the compressive strength is 1.111-1.858 MPa, and the density is 1129-1425 kg / m 3 , which can meet the requirements of upper seed germination concrete for seedling cultivation.

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

[0053] As shown in Table 4, when the cement content is 5.0-7.0% and the water-binder ratio is 3.6, the porosity of the concrete is 28.49-29.62%, the compressive strength is 1.108-1.592 MPa, and the density is 1295-1316 kg / m 3 , which can meet the requirements of upper seed germination concrete for seedling cultivation.

[0054] Example 3 Preparation of seedling breeding concrete and its performance effects According to the formula in Tables 5 and 6, 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.

[0055] Table 5 Effects of sand content and 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 made by using sea mud and sea sand as raw materials, preparing the seedling medium according to a certain sand content, and solidifying it with cement are significantly improved. When the cement content is 6.8%, the sand content is 25~75%, and the water-cement ratio is 2.76~5.10, the porosity of the concrete is 27.13~32.98%, the compressive strength is 1.267~1.888 MPa, and the density is 1345~1589 kg / m 3 , which can meet the requirements of seedling cultivation and lower layer seedling breeding concrete.

[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 of the control example, the porosity, compressive strength and density of the concrete made from sea mud and sea sand as raw materials, prepared according to a certain sand content and solidified with cement are significantly improved with the increase of cement content. When the sand content is 50%, the water-binder ratio is 3.57, and the cement content is 5.6~9.2%, the porosity of the concrete is 29.25~32.29%, the compressive strength is 1.112~2.356 MPa, and the density is 1452~1498 kg / m 3 , which can meet the requirements of seedling cultivation and lower layer seedling breeding concrete.

[0059] Example 4 Application of vegetation concrete seedling tube Seedling propagation concrete slurry and seed germination concrete slurry were prepared according to the formula in Table 7, and then the seedling propagation concrete slurry was first poured into a bamboo seedling tube with openings at both ends, an inner tube diameter of 10-12 cm, and a length twice the length of the embryonic axis of the Kandelia candel seed, and the pre-cultivated blank was obtained under normal temperature and pressure to obtain a propagation layer, which was cured for 3-5 days. After the concrete hardened, a Kandelia candel seed was put in and its embryonic axis was kept vertically on the soil surface, and then the seedling tube was filled with seed germination concrete slurry, and the pre-cultivated blank was obtained under normal temperature and pressure to obtain a germination layer. After further solidification and curing for 7-14 days, an integrated structure of vegetation concrete seedling tube was formed, and the vegetation concrete seedling tube 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 Kandelia candel, so as to realize the three functions of seed germination, seedling propagation and planting application.

[0060] Table 7 Effects of vegetation concrete seedling tubes on specific growth rate and survival rate of Kandelia candel 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 the Kandelia candel seedlings were low; adding fertilizers can make up for the lack of nitrogen, phosphorus and potassium in the seedling medium, and can 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 0%, water-cement ratio 3.6, cement content 7.0%, fertilizer content 0.5‰, the concrete conditions of the breeding layer: sand content 50%, water-cement ratio 3.2, cement content 6.8%, fertilizer content 1‰, the prepared vegetation concrete seedling tube, Kandelia candel seedlings specific growth rate can reach 0.208 cm / d, survival rate can reach 100%, the effect is the best.

[0062] Example 5 Effect of the germination layer / breeding layer height ratio on the germination rate and loss rate of seed embryo 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 bamboo seedling tube with openings at both ends, an inner diameter of 10-12 cm, and a length twice the length of the embryonic axis of the Kandelia candel seed, and the pre-cultivated blank was obtained under normal temperature and pressure conditions to obtain a breeding layer, which was cured for 3-5 days. After the concrete hardened, a Kandelia candel seed was placed and its embryonic axis was kept vertically on the soil surface, and then the seedling tube was filled with seed germination concrete slurry, and the pre-cultivated blank was obtained under normal temperature and pressure conditions to obtain a germination layer. After continued solidification and curing for 7-14 days, an integrated structure of vegetation concrete seedling tube was formed, and the germination layer / breeding layer height ratio was set according to Table 8. The vegetation concrete seedling tube was then directly vertically inserted into the tidal flat wetland at the estuary of Jinjing Creek, Jinjiang Campus, Fuzhou University, to cultivate natural seedlings of Kandelia candel, so as to investigate the influence of the height ratio on the germination rate and loss rate of the seed embryonic axis.

[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 1:3~4, the seeds of Kandelia can be well fixed in the vegetation concrete seedling tube, avoiding being washed away by the periodic tidal scouring and the waves. It has good water permeability and air permeability and can meet the nutritional needs of Kandelia, 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.

[0065] Example 6 Comparison of planting methods for cultivating natural Kandelia candel seedlings 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 bamboo seedling tube with openings at both ends, an inner tube diameter of 10-12 cm, and a length twice the length of the embryonic axis of the Kandelia candel seed, and the pre-cultivated blank was obtained under normal temperature and pressure conditions to obtain a breeding layer, which was cured for 3-5 days. After the concrete hardened, a Kandelia candel seed was placed and its embryonic axis was kept upright on the soil surface, and then the seedling tube was filled with seed germination concrete slurry, and the pre-cultivated blank was obtained under normal temperature and pressure conditions to obtain a germination layer. After continuing to solidify and cure for 7-14 days, an integrated structure of vegetation concrete seedling tube (whose germination layer / breeding layer height ratio was 1:4) was formed, and then the vegetation 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 Kandelia candel 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 retention rate of Kandelia candel seedlings

[0067] It can be seen from Table 9 that compared with direct planting of Kandelia candel seeds for afforestation, planting in vegetation concrete seedling tubes can effectively improve the retention rate of Kandelia candel 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 vegetation concrete seedling tube for cultivating Kandelia candel seedlings, characterized in that: The vegetation concrete seedling raising tube is formed by successively pouring the seedling breeding concrete of the lower layer and the seed germination concrete of the upper layer in the seedling raising tube in layers.

2. The vegetation concrete seedling tube for cultivating Kandelia candel seedlings according to claim 1, characterized in that: The seedling breeding concrete is composed of sea mud, sea sand, cement, sea water and fertilizer as raw materials, with a sand content of 25-75%, a water-cement ratio of 2.76-5.10, 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‰; wherein the particle size of the sea mud is 1.0-1.5 mm; the particle size of the sea sand is 0.5-1.0 mm; the cement is PS 42.5 slag silicate cement; the total nutrient content of the fertilizer is 25%, and the ratio of N, P2O5, and K2O is 8:8:9%.

3. The vegetation concrete seedling tube for cultivating Kandelia candel seedlings according to claim 1, characterized in that: The seed germination concrete is composed of sea mud, cement, seawater and fertilizer as raw materials, and its water-cement ratio is 2.6-4.6; based on the weight of the sea mud used, the cement content is 5.0-7.0%, and the fertilizer content is 0.5‰; wherein the particle size of the sea mud is 1.0-1.5 mm, and the cement is PS 42.5 slag silicate cement; the total nutrient content of the fertilizer is 25%, and the ratio of N, P2O5, and K2O is 8:8:9%.

4. The vegetation concrete seedling tube for cultivating Kandelia candel seedlings according to claim 1, characterized in that: The seedling raising tube is a bamboo tube, a plastic tube or a metal tube with two openings at both ends, an inner tube diameter of 10-12 cm and a length twice the length of the embryo axis of the Kandelia candel seed.

5. A method for cultivating Kandelia candel seedlings using the vegetation concrete seedling tube according to claim 1, characterized in that: First, pour the slurry of seedling breeding concrete into the seedling tube, and prepare the breeding layer by pre-growing the blank. Curing is carried out for 3 to 5 days. After the concrete hardens, put the Kandelia ovata seeds and keep their hypocotyls in a vertical state. Then, pour the slurry of seed germination concrete into the seedling tube, and prepare the germination layer by pre-growing the blank. After continuing to solidify and cure for 7 to 14 days, an integrated structure of 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 Kandelia ovata.

6. The method according to claim 5, characterized in that: In the vegetation concrete seedling tube, the height ratio of the upper germination layer to the lower breeding layer is 1:3-4.

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