Apocynum grandiflorum vegetation recovery method and application thereof

Abstract

The invention discloses an apocynum macranthum vegetation restoration method and application thereof, belongs to the field of ecological restoration, and aims to realize vegetation restoration of river impact plains. The method comprises the following steps: S1, taking corn cobs, and cutting the corn cobs into corn cobs with the length of 5-10cm for later use; s2, treading the corn cobs into wet soil; s3, forming a first groove in the top end of the corn cob core, putting apocynum macranthum seeds and soybean seeds into the first groove, and sealing the first groove with slurry; and S4, after the first groove is sealed, enabling the apocynum grandiflorum seeds to germinate in a wet environment, and after the apocynum grandiflorum seeds germinate, performing field management. According to the method, seedling raising and growth are combined together, transplanting operation is avoided, and damage of transplanting to root systems of apocynum grandiflorum seedlings is reduced. Furthermore, due to the fact that transplanting operation is simplified, breeding operation of the apocynum macranthum can be greatly simplified, labor and time cost is reduced, and rapid recovery of apocynum macranthum vegetation is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ecological restoration, in particular to a method for restoring vegetation of Apocynum henryi and application thereof. More specifically, the present application provides a method for interplanting Apocynum henryi and soybean, which is a method for in-situ planting of Apocynum henryi (i.e. a method for direct sowing of Apocynum henryi). The method can provide assistance for Apocynum henryi seedlings to break through the soil, and realize vegetation restoration of river-impacted plains through planting of Apocynum henryi, shorten the cultivation process, reduce the breeding cost of Apocynum henryi, and improve the survival rate of Apocynum henryi seedlings. The method has high application value and good application prospect, and has important significance for promoting ecological restoration and economic development. BACKGROUND

[0002] According to the National Key Protected Agricultural Wild Plants Outline, Apocynum henryi, Poacynum hendersonii (Hook.f.) Woodson is a perennial herb or erect semi-shrub, with a height of up to 2.5 m, and white latex throughout the whole plant. The small branches tend to be central to the stem, and the leaves are alternate, sometimes opposite at the upper part of the stem, elliptical, ovate, oblong or linear-lanceolate, 1.5-5 cm long and 0.2-2.3 cm wide, with fine teeth on the edges, and granular protrusions on both surfaces, with about 15 lateral veins on each side; the leaf stalk is short and flat. The conical cyme is 1- multiple cyme, and is terminal. The flowering period is from April to September, and the fruiting period is from June to December.

[0003] Apocynum henryi has strong drought resistance, mainly distributed in arid regions with annual precipitation of less than 250 mm, and can withstand extreme temperature changes of-30℃ to 40℃. In terms of soil, it mainly grows in saline desert soil, sandy soil and river alluvial soil, and has strong tolerance to soil salinity (up to 1.0%). Its deep root system can extend to 3 meters below the ground, and can effectively utilize underground water and seasonal flood supply, and is often found in dry riverbeds, desert oasis edges, etc.

[0004] In terms of community characteristics, Apocynum henryi is often associated with Tamarix, Haloxylon, etc. to form sparse desert shrubs in natural state, and the community structure is simple, with a coverage usually maintained at 30%-50%. In areas with better water conditions such as the Tarim River coast, it can form a single-species community.

[0005] In the document "Analysis of the Current Situation of the Xinjiang Apocynum venetum Industry" (Yang Hongwei, Chen Ru, Yao Guomin, He Yating, Tang Yong, Wang Juanli, Chen Yong. Xinjiang Agricultural Science, 2024, 61(S1): 163-167), research shows that Xinjiang is the most widely distributed area of Apocynum venetum in China, and is also the best production area of Apocynum venetum. Yuli County in Xinjiang is the largest area of wild Apocynum venetum distribution in China (about 1.6 million mu). Apocynum venetum is concentrated in the valley plain areas of the Tarim River, the Konque River, the Hetian River, the Qerqen River, the Yerkeshang River and other major river basins in southern Xinjiang. In the northern and southern parts of the Junggar Basin in northern Xinjiang, there are also distributions along the coasts of the Haba River, the Ertix River, the Yili River, the Aibi Lake Wetland Nature Reserve, Gongliu County, Xinyuan County, Gaohao Pasture, Hongnaihai Township of Zhaosu County, Aerye Tan Town of Aletai City, and Donghetan Township of Yuli County.

[0006] Apocynum venetum can be propagated by seed and vegetative propagation. Apocynum venetum seed propagation can be divided into direct seeding and seedling cultivation. Direct seeding of Apocynum venetum involves the following operations: Apocynum venetum seeds are small, with 2,000 seeds per gram, and are not easy to germinate and emerge, so direct seeding should be carried out on sandy loam soil with light salinity. In early April, the land is prepared and ridges are formed, and enough water is poured. 7.5 kg of seeds per hectare are mixed with wet sand and sown, and the soil is covered shallowly. It is important to avoid soil compaction and cause seedling death. Seedling cultivation of Apocynum venetum involves the following operations: After the seedlings are cultivated in a greenhouse, the seedlings are planted by transplanting.

[0007] Apocynum venetum vegetative propagation techniques include division propagation, root stem propagation, cutting propagation, and tissue culture propagation. Root segment propagation damages the habitat of Apocynum venetum and wild resources, and has a low propagation coefficient. Root stem block propagation has a lower propagation rate than whole plant transplanting, wild seedling transplanting, seedling cultivation, and seedling transplanting.

[0008] How to restore vegetation in the plain impacted by rivers has been a technical problem that researchers urgently need to solve. SUMMARY

[0009] The present application aims to provide a large-flowered Apocynum venetum vegetation restoration method and its application, to restore vegetation in the plain impacted by rivers. The present application can effectively improve the germination rate and survival rate of large-flowered Apocynum venetum, simplify the cultivation process, effectively promote the restoration of local biological populations, and has important ecological and social and economic values.

[0010] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: A large-flowered Apocynum venetum vegetation restoration method, comprising the following steps: S1, taking a corn cob core, cutting the corn cob core into 5-10 cm long, and reserving; S2, stepping the corn cob core into wet soil; S3, forming a first groove at the top end of the corn cob core, and putting the apocynum venetum seeds and soybean seeds into the first groove, and then sealing the first groove with mud; S4, after the first groove is sealed, the apocynum venetum seeds germinate in the humid environment, and after the apocynum venetum germinates, field management is performed.

[0011] In the step S2, a first insertion rod is inserted into one end of the corn cob core, so that the corn cob core and the first insertion rod are integrated, and then the end of the corn cob core provided with the first insertion rod is stepped into the humid soil.

[0012] In the step S2, the corn cob core is stepped into the humid soil in the river bank impact plain zone, and the adjacent two corn cob cores are spaced 30-100 cm apart.

[0013] In the step S3, a first rod-shaped object is used to form a first groove at the top end of the corn cob core.

[0014] The first rod-shaped object is one or more of a metal rod-shaped object, a wooden rod-shaped object, a bamboo rod-shaped object, a plastic rod-shaped object, a ceramic rod-shaped object, and a glass rod-shaped object.

[0015] The first rod-shaped object is one of a chopstick, a tree branch, and a bamboo branch.

[0016] In the step S3, after the corn cob core is stepped into the soil, it absorbs water in the surrounding humid soil to meet the needs of the apocynum venetum and soybean germination and growth.

[0017] In the step S3, the depth of the first groove is 1-2 cm.

[0018] In the step S3, the apocynum venetum seeds and soybean seeds are put into the first groove; in a single first groove, 1-5 apocynum venetum seeds and 1-2 soybean seeds are put in. Here, the apocynum venetum seeds used are selected apocynum venetum seeds after screening.

[0019] In the step S4, during the growth of the soybean, root nodules are formed at the root part, and the rhizobium in the root nodules can provide nitrogen source for the growth of the apocynum venetum.

[0020] In the step S4, a spraying or drip irrigation method is used to provide a humid germination environment for the apocynum venetum seeds.

[0021] In the step S4, after a period of time, the corn cob core will completely rot, thereby providing humus for the apocynum venetum and soybean.

[0022] In the step S4, after the apocynum venetum germinates, seedlings and saplings are formed in situ, and transplanting is not needed.

[0023] The application of the aforementioned methods for restoring Apocynum venetum vegetation.

[0024] This method was applied to the cultivation of large-flowered Apocynum venetum in riverside alluvial plains.

[0025] This method was applied to the fixed-point propagation of Apocynum venetum.

[0026] By establishing fixed-location breeding sites, suitable growing spaces can be provided for other species, which is conducive to the recovery of plant communities.

[0027] The corn cob, a product of the female spadix, has a thick, fleshy stalk at its center. After the mature corn cob has been threshed, the remaining stalk is called the corn cob. Therefore, the corn cob is also called the corn cob or corn cob axis, and it is the large central stalk of the corn cob. The outer surface of the corn cob has small, uneven sockets filled with corn kernels. Hidden in the center of the corn cob is a soft, white "sponge." When the corn is not fully ripe, this white "sponge" is hard, yet you can pinch it; as the corn matures, or even dries out, it becomes a soft sponge.

[0028] In Xinjiang, flash floods are frequent in spring, often turning flat areas near riverbanks into seasonal marshy shallows. Establishing appropriate ecological barriers to reduce flood damage to farmland on both banks has become a concern for the inventors. Based on the traditional, simple concept of "living off the land," and adhering to the principles of complete decomposition and avoiding secondary pollution, this application provides a method for restoring Apocynum venetum vegetation and its application. The materials involved include corn cobs, Apocynum venetum seeds, soybean seeds, and soil. The Apocynum venetum and soybean seeds will grow into plants, the soil will return to the earth, and the naturally decomposed corn cobs will serve as fertilizer to provide nutrients for the Apocynum venetum and soybeans, thus achieving the principle of complete decomposition (i.e., the complete utilization of materials). Furthermore, this invention avoids the use of plastic standard trays and other structures, thus preventing secondary pollution problems caused by the use of plastic products. Furthermore, this application allows for the direct placement of corn cobs into shallow swamps after flash floods. The water absorption capacity of the corn cobs provides the necessary moisture for the germination and growth of Apocynum venetum and soybeans. This application utilizes locally sourced materials, applying the water brought by flash floods to the germination and growth of Apocynum venetum and soybeans, embodying the traditional and simple concept of "living off the land and water." Preferably, when environmental moisture is insufficient, spraying or drip irrigation can be used to provide the necessary moisture for the germination and growth of Apocynum venetum and soybeans. Once the corn cobs are placed in the moist soil, bacteria in the river accelerate the decomposition of the corn cobs, transforming them from a cultivation bed into a culture medium, providing the necessary nutrients for the germination and growth of Apocynum venetum and soybeans.

[0029] Furthermore, this application enables targeted sowing, thereby avoiding the problem of uneven distribution. Using this invention, when restoring vegetation in swampy shallows, *Apocynum venetum* can be planted at specific locations, effectively avoiding the problem of uneven distribution and reserving sufficient growing space for it, which is also conducive to the reproduction of the species and thus promotes the restoration of the corresponding community.

[0030] This application integrates seedling cultivation and growth, avoiding transplanting and reducing damage to the root system of Apocynum venetum seedlings. Furthermore, by simplifying the transplanting process, this application can significantly simplify the propagation of Apocynum venetum, reduce labor and time costs, and facilitate the rapid recovery of Apocynum venetum vegetation. Detailed Implementation

[0031] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0032] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0033] Example 1 Using a marshland formed by a spring flood in the Tarim River Basin of Xinjiang Uygur Autonomous Region in a certain year as the experimental site, the experimental site area of ​​Example 1 was about 500 square meters. The propagation of Apocynum venetum was carried out, and the specific operation is as follows.

[0034] S1. Take corn cobs that have been threshed, are free of disease, are dry, and clean. Cut the corn cobs into 5-10cm lengths and set aside.

[0035] S2. The experimenters put corn cobs into backpacks and took them to the test site. On the swampy shallows formed by the flood (i.e., the test site), the experimenters stepped the corn cobs into the moist soil, with adjacent corn cobs spaced about 50cm apart.

[0036] S3. After the corn cob is pressed into the moist soil, use a rod-like object to create a first groove at the top of the corn cob. Place Apocynum venetum seeds and soybean seeds into the first groove, and then seal the groove with mud. In a specific example, chopsticks are used as the first rod-like object, the depth of the first groove is 1-2 cm, and 1-5 Apocynum venetum seeds and 1-2 soybean seeds are placed in each groove; the mud thickness is approximately 2-3 mm. Here, the Apocynum venetum seeds used are selected after screening.

[0037] S4. After the first groove is sealed, allow the seeds of Apocynum venetum to germinate in a moist environment. Once the seeds have germinated, proceed with field management.

[0038] In step S4, if insufficient moisture is found in the experimental site, spraying or drip irrigation can be used to provide a moist germination environment for the seeds of Apocynum venetum.

[0039] After planting, the growth of Apocynum venetum should be recorded regularly.

[0040] Example 2 Using a marshland formed by a spring flood in the Ili River basin of Xinjiang Uygur Autonomous Region in a certain year as the experimental site, the experimental site area of ​​Example 2 was about 500 square meters. The propagation of Apocynum venetum was carried out, and the specific operation is as follows.

[0041] S1. Take corn cobs that have been threshed, are free of disease, are dry, and clean. Cut the corn cobs into 5-10cm lengths and set aside.

[0042] S2. The experimenters put the corn cobs into backpacks and took them to the test site. On the swampy shallows formed by the flood (i.e., the test site), they inserted the first stake into one end of the corn cob, connecting the corn cob to the first stake. The experimenters then stepped the end of the corn cob with the first stake into the moist soil, with an interval of about 50 cm between adjacent corn cobs.

[0043] S3. After the corn cob is pressed into the moist soil, use a rod-like object to create a first groove at the top of the corn cob. Place Apocynum venetum seeds and soybean seeds into the first groove, and then seal the groove with mud. In a specific example, chopsticks are used as the first rod-like object, the depth of the first groove is 1-2 cm, and 1-5 Apocynum venetum seeds and 1-2 soybean seeds are placed in each groove; the mud thickness is approximately 2-3 mm. Here, the Apocynum venetum seeds used are selected after screening.

[0044] S4. After the first groove is sealed, allow the seeds of Apocynum venetum to germinate in a moist environment. Once the seeds have germinated, proceed with field management.

[0045] In step S4, if insufficient moisture is found in the experimental site, spraying or drip irrigation can be used to provide a moist germination environment for the seeds of Apocynum venetum.

[0046] After planting, the growth of Apocynum venetum should be recorded regularly.

[0047] Comparative Example 1 The experimental site used in Comparative Example 1 was about 2 kilometers away from the experimental site of Example 1. The experimental site area of ​​Comparative Example 1 was about 500 square meters. The method of direct sowing of Apocynum venetum seeds was adopted, and the specific operation is as follows.

[0048] S1. On the swampy shallows formed by flood impact (i.e., the experimental site), the researchers directly sowed the seeds of Apocynum venetum on the surface of the swampy shallows according to the designated points, and covered the seeds with 1 mm to 2 mm of soil. 5 to 10 seeds were sown at each point, and the points were arranged in a square, with an interval of about 50 cm between adjacent points.

[0049] If insufficient moisture is found in the experimental site, spraying or drip irrigation can be used to provide a moist germination environment for the seeds of Apocynum venetum.

[0050] After planting, the growth of Apocynum venetum should be recorded regularly.

[0051] The instructions specify that timely topdressing and pest and disease control are required in Examples 1, 2, and Comparative Example 1. Specifically, the first topdressing should be applied when the *Apocynum venetum* seedlings reach 10 cm in height, using 3-5 kg ​​of nitrogen fertilizer per mu (approximately 0.067 hectares). A second topdressing should be applied from late June to mid-July, using 10 kg of phosphorus fertilizer and 5 kg of potassium fertilizer per mu, followed by watering. Fertilization should cease in late July. If *Apocynum venetum* develops leaf spot during its growth period, it should be immediately treated with a 600-800 times dilution of 50% thiophanate-methyl for prevention. If further application is necessary, it should be done at an interval of 7-10 days.

[0052] The germination rate of *Apocynum venetum* in Example 1 was 85.7%, in Example 2 it was 81.2%, and in Comparative Example 1 it was only 13.5%. The inventors analyzed the data and concluded that the lower germination rate in Example 2 compared to Example 1 might be due to the low spring temperatures in the Ili River basin affecting the germination of *Apocynum venetum*, leading to a lower germination rate. The low germination rate and irregular spot distribution of *Apocynum venetum* in Comparative Example 1 could be due to several factors, including: (1) The seeds of Apocynum venetum are small, with about 200 seeds per gram. Some seeds may be washed away by the water flow, which affects their germination rate. (2) The seeds of Apocynum venetum lack the suitable growth environment provided by the corn cob in this application, which also seriously affects their germination rate. Since the seeds of Apocynum venetum are small, the environmental factors in the early stage of germination are particularly important, which is the fundamental reason why greenhouse seedling cultivation is commonly used in the existing technology. (3) Fish in shallow waters may swallow seeds or carry seeds to the deep soil or the surface of the soil during their movement, which also affects the germination rate of Apocynum venetum seeds. Furthermore, although Apocynum venetum in Comparative Example 1 was sown in a square arrangement, its germination was uncertain due to multiple factors, resulting in irregular distribution of the seedlings after germination.

[0053] Three months after planting, the plant height of *Apocynum venetum* was measured. The average plant height of *Apocynum venetum* in Example 1 was slightly higher than that in Example 2, with a difference of about 10%. This may be because the average spring temperature in the Ili River Basin is lower than that in the Tarim River Basin, causing the germination time of *Apocynum venetum* in Example 2 to be slightly later than that in Example 1, resulting in the difference in plant height. The average plant height of *Apocynum venetum* in Example 1 was significantly higher than that in Comparative Example 1, with a difference of 5.76 cm. The reason for this is: (1) The corn cob used in Example 1 has a vascular bundle structure, which can provide water and wind protection for the seeds of Apocynum venetum and soybean, and is suitable for the germination of Apocynum venetum seeds; while Comparative Example 1 lacks the corresponding environment, which makes the germination time relatively late. (2) During the growth of soybean seedlings, the nitrogen-fixing bacteria in the roots of soybean seedlings can provide a continuous source of nitrogen for the growth of Apocynum venetum. (3) After the corn cob decomposes, it can provide humus for soybeans and Apocynum venetum, which plays a role in improving the local soil environment and promoting the growth of Apocynum venetum seedlings.

[0054] Large-flowered Apocynum venetum seeds are small and have weak emergence ability, making deep sowing unsuitable. Direct sowing is rarely used in production due to low germination rates; currently, greenhouse tray seedling cultivation and transplanting are more common. Tray seedling cultivation requires a large quantity of seeds, involves complex procedures, is labor-intensive, has a long seedling cycle, and demands high technical expertise. Simplifying seedling cultivation and promoting vegetation restoration has become a pressing technical problem that the inventors urgently hope to solve.

[0055] As mentioned earlier, Xinjiang is prone to flash floods in spring, and flat areas near riverbanks are often washed away by floods into seasonal swamps and shallows. To address this, the inventors, based on the characteristic that Apocynum venetum prefers to grow near water, intercropped Apocynum venetum and soybeans on both banks of rivers to achieve corresponding vegetation restoration. By intercropping Apocynum venetum and soybeans on both banks of rivers in arid areas of Xinjiang, the following effects can be achieved: (1) Apocynum venetum establishes an ecological barrier to prevent floods from damaging the fields on both banks; (2) After the flood recedes, the well-developed roots of Apocynum venetum can help the ecological environment on both banks to recover quickly; (3) Both Apocynum venetum and soybeans have certain economic value, which is conducive to achieving the unity of ecological and economic value and improving barren soil.

[0056] This application uses *Apocynum venetum* as a remediation plant, which possesses extremely strong drought resistance, capable of growing in arid areas with annual precipitation of less than 250 mm, and able to tolerate extreme temperature variations from -30℃ to 40℃. Simultaneously, its deep root system can extend more than 3 meters below the ground, effectively utilizing groundwater and seasonal flood replenishment. Furthermore, the unique vascular bundle structure of the corn cob in this application is beneficial for providing water and wind protection for *Apocynum venetum* and soybean seeds. In alluvial plains, strong winds easily carry away the tiny *Apocynum venetum* seeds from bare soil lacking vegetation cover. Sunny weather further increases soil moisture, and soil capillary action further depletes the water around the *Apocynum venetum* seeds, leading to surface soil compaction and accelerated seed inactivation. Under these conditions, *Apocynum venetum* seeds have poor germination ability and cannot break through the compacted soil, easily becoming trapped and rotting. However, as soybean seedlings emerge and grow, they help the seeds of Apocynum venetum germinate and survive. The nitrogen-fixing bacteria in the roots of soybean seedlings can also provide a continuous source of nitrogen for the growth of Apocynum venetum.

[0057] Furthermore, by employing this application, the spacing of *Apocynum venetum* can be artificially controlled, which has the following advantages: (1) To reserve space for the subsequent growth of Apocynum venetum; (2) It can accurately calculate the amount of various materials such as Apocynum venetum seeds, which is convenient for advance planning; (3) The appropriate distance between large-flowered Apocynum venetum is conducive to the growth of other plants, thereby promoting the recovery of the plant community rather than the reproduction of a single species. This is of great significance for improving the resistance of the plant community to diseases and pests.

[0058] Furthermore, this invention seeks protection for the application of the aforementioned Apocynum venetum restoration method in vegetation restoration in riverside alluvial plains in arid regions like Xinjiang.

[0059] Due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) Large-flowered Apocynum venetum is a perennial herb with a rhizome that is more than ten meters long and can reach a depth of more than ten meters. The purpose of this application to cultivate large-flowered Apocynum venetum is to better conserve water and soil and prevent water and soil erosion. This invention effectively solves the problems of poor vegetation growth and easy river course changes in alluvial plains. (2) This application uses Apocynum macrocarpa as a restoration plant, which is drought-resistant and also likes water. In a water-rich environment, Apocynum macrocarpa can grow well and the hemp fiber produced is of better quality and has certain economic value. (3) In this application, the corn cob serves as a seedbed on the one hand, and its vascular bundle structure can provide water and wind protection for the seeds of Apocynum venetum and soybean, which is suitable for the germination of Apocynum venetum seeds; In this application, the corn cob mainly serves as a seedbed and retains moisture and heat in the early stage. (4) Soybeans provide nitrogen source for Apocynum venetum in the early stage, and corn cobs can provide humus for soybeans and Apocynum venetum after they decompose, thus improving the local soil environment. In this application, corn cobs can provide nutrients and improve the local soil microenvironment during the decomposition process. (5) This application utilizes the characteristics of the river alluvial plain itself and uses the environment to provide the necessary water for the germination and growth of Apocynum venetum, which is beneficial to the germination and growth of Apocynum venetum; (6) This application avoids the use of plastic standard trays and the transplanting operation of Apocynum venetum seedlings, simplifies the cultivation operation of Apocynum venetum, helps to reduce the cost of vegetation restoration and promote the restoration of the ecosystem; (7) This application can adopt a fixed-point planting method to artificially control the spacing of Apocynum venetum, which can not only reserve space for the subsequent growth of Apocynum venetum, but also help the plant community to recover and improve the community's resistance to diseases and pests.

[0060] This invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A method for restoring Apocynum venetum vegetation, characterized in that, Includes the following steps: S1. Take the corn cob and cut it into 5-10cm lengths for later use; S2. Press the corn cob into the moist soil; S3. Form the first groove at the top of the corn cob, put the seeds of Apocynum venetum and soybean into the first groove, and then seal the first groove with mud. S4. After the first groove is sealed, allow the seeds of Apocynum venetum to germinate in a moist environment. Once the seeds have germinated, proceed with field management.

2. The method according to claim 1, characterized in that, In step S2, the corn cobs are pressed into the moist soil of the alluvial plain along the river, with a spacing of 30-100cm between adjacent corn cobs.

3. The method according to claim 1, characterized in that, In step S3, a first groove is formed at the top of the corn cob using a first rod-shaped object.

4. The method according to claim 3, characterized in that, The first rod-shaped object is one or more of the following: metal rod-shaped object, wooden rod-shaped object, bamboo rod-shaped object, plastic rod-shaped object, ceramic rod-shaped object, and glass rod-shaped object.

5. The method according to any one of claims 1 to 4, characterized in that, In step S3, Apocynum venetum seeds and soybean seeds are placed into the first groove; 1 to 5 Apocynum venetum seeds and 1 to 2 soybean seeds are placed in each first groove.

6. The method according to any one of claims 1 to 5, characterized in that, In step S4, after the large-flowered Apocynum venetum germinates, it forms seedlings and mature seedlings in situ without the need for transplanting.

7. The application of the method for restoring Apocynum venetum vegetation as described in any one of claims 1 to 6.

8. The application according to claim 7, characterized in that, This method was applied to the cultivation of large-flowered Apocynum venetum in riverside alluvial plains.

9. The application according to claim 7 or 8, characterized in that, This method was applied to the fixed-point propagation of Apocynum venetum.