A method for returning to field of holodiscus dumosus

Abstract

The application provides a wild returning method of Myricaria laxiflora, which comprises the following steps: returning and planting Myricaria laxiflora plants in sandy beach land as a returning point, wherein the sandy beach land has the following conditions: the flood time in flood season is less than or equal to 5 months, the annual rainfall is 1000mm-1200mm, the altitude is 40m-150m, the average annual temperature is 17-19 DEG C, the annual minimum temperature is greater than or equal to -9 DEG C, and the annual maximum temperature is less than or equal to 42 DEG C. The wild returning method can improve the waterlogging and scouring resistance of Myricaria laxiflora, and the survival rate and preservation rate of Myricaria laxiflora in the wild.

Description

Technical Field

[0001] This invention belongs to the field of field reintroduction technology for rare and endangered plants, specifically relating to a field reintroduction method for sparsely flowering water juniper. Background Technology

[0002] *Myricaria laxiflora* (Franch.) PY Zhang et YJ Zhang is a perennial shrub belonging to the genus *Myricaria* in the family Tamaricaceae. It is a Class II protected plant in China, originally scattered along the sandy or stony riverbanks of the Yangtze River in Zigui and Badong counties of Hubei Province and the Wushan Gorge of Sichuan Province, earning it the reputation of being a unique feature of the Three Gorges. *Myricaria laxiflora* possesses high ecological value, serving functions such as wave protection, sand fixation, soil stabilization, slope protection, and riverbank beautification.

[0003] *Myricaria latifolia* is native to the riverbanks of the Yangtze River from Yichang, Hubei Province to Chongqing Municipality, and is mainly distributed in the Three Gorges Reservoir area. To adapt to the seasonal rise and fall of the Yangtze River's water level, *Myricaria latifolia* has developed an anti-seasonal growth rhythm of summer dormancy and winter growth. However, after the construction of the Three Gorges Dam, due to flood control and power generation needs, the Three Gorges Reservoir operates on a "winter storage, summer discharge" model, resulting in high water levels in winter and low water levels in summer. This pattern contradicts the anti-seasonal growth rhythm of *Myricaria latifolia*, leading to habitat destruction and fragmentation. Coupled with the species' physiological and ecological characteristics, population regeneration of *Myricaria latifolia* has been severely disrupted, resulting in a sharp decline in its population. According to the IUCN Red List of Threatened Species and criteria, *Myricaria latifolia* is classified as "Endangered (EN)".

[0004] Currently, certain achievements have been made in the ex-situ conservation, cutting propagation, and seed propagation of *Myricaria latifolia*. Introducing artificially propagated *Myricaria latifolia* into nature to expand its wild population and carry out reintroduction into the wild is both necessary and ecologically significant.

[0005] Furthermore, the Three Gorges Reservoir's "winter storage and summer discharge" water level pattern is opposite to the growth rhythm of *Myricaria latifolia*, and in recent years, researchers have discovered scattered wild populations of *Myricaria latifolia* in the Yichang section of the Yangtze River downstream of the Three Gorges Dam. Therefore, to adapt to the growth rhythm of *Myricaria latifolia* and expand its wild population, reintroducing artificially bred *Myricaria latifolia* into the wild is a necessary option. However, the arrival of the summer rainy season and the flood discharge from the Three Gorges Dam and Gezhouba Dam cause the Yangtze River's water level to rise, increasing the scouring force of the water flow. This poses a greater challenge to the plant's rooting and resistance to being washed away, resulting in a significant decrease in the survival rate and preservation rate of reintroduced *Myricaria latifolia*.

[0006] Therefore, how to improve the waterlogging and erosion resistance of Juniperus spp., as well as the survival and preservation rate of Juniperus spp. after its reintroduction into the wild, are technical problems that urgently need to be solved in this field. Summary of the Invention

[0007] This invention provides a method for the field reintroduction of sparsely-flowered juniper, which can improve the waterlogging and erosion resistance of sparsely-flowered juniper, as well as the survival rate and preservation rate of sparsely-flowered juniper after field reintroduction.

[0008] This invention provides a method for the reintroduction of Juniperus sparseflora into the wild, comprising: using sandy riverbanks as the reintroduction point to replant Juniperus sparseflora plants;

[0009] In the sandy riverbanks described, the flood season lasts for ≤5 months, the annual rainfall is 1000mm~1200mm, the altitude is 40m~150m, the average annual temperature is 17~19℃, the annual minimum temperature is ≥-9℃, and the annual maximum temperature is ≤42℃.

[0010] The above-described field reintroduction method includes at least one of the following: planting with weed control cloth, planting without non-woven bags, and planting with non-woven bags.

[0011] The above-described field reintroduction method, wherein the thin-flowered juniper plant is obtained by domestication and cultivation of thin-flowered juniper seedlings in pots;

[0012] The sparsely-flowered water juniper seedlings include at least one of the following: one-year-old sparsely-flowered water juniper seedlings, two-year-old sparsely-flowered water juniper seedlings, and three-year-old sparsely-flowered water juniper seedlings.

[0013] The above-described field reintroduction method includes the following: growing the sparse-flowered juniper seedlings in a shade structure at the reintroduction point for 2 months to obtain the sparse-flowered juniper plants, wherein watering is performed 2-3 times per week in the first month and 1-2 times per week in the second month.

[0014] During the growth of the sparsely flowering water juniper seedlings, the roots of the sparsely flowering water juniper seedlings are subjected to 2-3 first disinfection treatments.

[0015] The first disinfection treatment includes: drenching the roots of the potted juniper seedlings with a 50% carbendazim wettable powder solution (1g dissolved in 600mL of water).

[0016] The field reintroduction method described above further includes optimizing the ecological environment of the reintroduction point before the reintroduction planting, including:

[0017] a. Remove other vegetation at the regression point;

[0018] b. Leveling the terrain and performing a second disinfection treatment on the soil at the regression point;

[0019] c. Install a retaining wall on the water-facing side of the return point.

[0020] The field re-entry method described above, wherein the leveling of the terrain and the second disinfection treatment of the soil at the re-entry point include:

[0021] Apply 20g of 50% carbendazim wettable powder per square meter of the described regression point and then till the soil.

[0022] The above-described field return method, wherein setting up a retaining wall on the water-facing side of the return point includes setting up a retaining wall with a height of 50-60cm and a width of 15-20cm on the water-facing side of the return point.

[0023] The above-described method of reintroduction into the wild includes the following steps: placing the sparsely-flowered water juniper plants into the planting holes at the reintroduction point in March or April each year, covering them with 10-12cm thick pebbles, filling and compacting them with river sand, covering them with topsoil until they are level with the ground, tamping them down, surrounding the seedlings with large pebbles, and watering them thoroughly after planting.

[0024] The above-described field reintroduction method further includes, after the reintroduction planting, the management and maintenance of the thin-flowered juniper plants, the management and maintenance including:

[0025] During the first month after replanting, drench the roots weekly with ABT3 rooting powder solution to promote root growth in the thinned-flowering juniper plants, and spray weekly with a 100-150 mg / L gibberellin growth solution; and / or,

[0026] For the first two months after replanting, check the plant's survival rate weekly and water according to soil moisture, ensuring thorough watering; and / or,

[0027] When the sparsely flowering juniper plants are submerged during the first flood season, after the water recedes, support the seedlings and mound soil around them. In the first month after the water recedes, spray them with a solution of 0.3wt%~0.5wt% urea and 0.2wt%~0.3wt% potassium dihydrogen phosphate 2~3 times, with each spraying amount being 150~300mL per plant.

[0028] The field regression method described above further includes monitoring the *Myrica sparsely-flowered* plants, the monitoring including:

[0029] The survival rate of thin-flowered juniper plants was investigated in May and June, and the retention rate of thin-flowered juniper plants was investigated in October.

[0030] In March and April of the second year after replanting, the survival rate, plant height, and basal diameter of the thinned-flowered juniper plants were investigated.

[0031] This invention uses the above-mentioned field reintroduction method to realize the field reintroduction of sparsely flowering juniper, which improves its survival rate and preservation rate. The field reintroduction method has the advantages of simple operation, low cost, high efficiency and speed. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] Reintroducing artificially propagated *Myricaria latifolia* into the wild is essential for expanding its wild population. However, the arrival of the summer rainy season and the flood discharge from the Three Gorges Dam and Gezhouba Dam have caused the Yangtze River's water level to rise, increasing the scouring force of the water flow and significantly reducing the survival and preservation rates of reintroduced *Myricaria latifolia*. This invention, based on the distribution of *Myricaria latifolia* and its native growing conditions, selects sandy riverbanks with annual rainfall, altitude, average annual temperature, minimum annual temperature, and maximum annual temperature similar to its original distribution area as reintroduction points for planting *Myricaria latifolia*. This achieves the reintroduction of *Myricaria latifolia* into the wild, improving its resistance to flooding and scouring, as well as its survival and preservation rates.

[0034] Based on this, the present invention provides a method for the field reintroduction of sparsely-flowered juniper, comprising: using sandy riverbanks as the reintroduction point to reintroduce sparsely-flowered juniper plants.

[0035] Among them, in sandy river beaches, the flood season lasts for ≤5 months, the annual rainfall is 1000mm~1200mm, the altitude is 40m~150m, the average annual temperature is 17~19℃, the annual minimum temperature is ≥-9℃, and the annual maximum temperature is ≤42℃.

[0036] When sandy riverbanks with conditions similar to the native environment of Myricaria sparsely floweredii are selected as the reintroduction points, the population distribution range of Myricaria sparsely floweredii can be expanded, and the survival rate and preservation rate of Myricaria sparsely floweredii reintroduced into the wild can be improved.

[0037] In this invention, the method of replanting includes at least one of the following: planting with weed control cloth, planting without non-woven bags, and planting with non-woven bags, with the planting with weed control cloth being the preferred method.

[0038] In some implementations, the seedlings of *Myricaria sparsely-flowered* are domesticated and cultivated to obtain *Myricaria sparsely-flowered* plants, which enable the artificially propagated *Myricaria sparsely-flowered* plants to better adapt to the wild ecological environment, improve the survival and growth capacity of the *Myricaria sparsely-flowered* plants, and thus improve the survival rate and preservation rate of the *Myricaria sparsely-flowered* plants when they are reintroduced into the wild.

[0039] Furthermore, the *Myricaria sparsely-flowered* seedlings include at least one of the following: one-year-old, two-year-old, and three-year-old *Myricaria sparsely-flowered* seedlings, preferably three-year-old. This invention selects one-year-old (≥20 cm tall), two-year-old (≥25 cm tall), and three-year-old (≥35 cm tall) *Myricaria sparsely-flowered* seedlings propagated by cuttings. The selected seedlings are robust, free from wilting, pests, and yellowing, and were all propagated in a shade structure at the Yangtze Rare Plant Research Institute near the Three Gorges Dam.

[0040] In this invention, the acclimatization and cultivation process includes: growing *Myricaria sparsely-flowered* seedlings in pots within a shaded area at the return point for two months to obtain *Myricaria sparsely-flowered* plants. During the first month, watering is done 2-3 times per week, and during the second month, watering is done 1-2 times per week. By gradually reducing the watering frequency, the *Myricaria sparsely-flowered* seedlings are gradually adapted to the wild climate, improving their survival rate. Simultaneously, the roots of the *Myricaria sparsely-flowered* seedlings undergo 2-3 primary disinfection treatments during their growth to prevent and control root diseases, thus promoting healthy growth.

[0041] Furthermore, the first disinfection treatment includes: drenching the roots of the potted sparsely flowering juniper seedlings with a 50% carbendazim wettable powder solution (prepared by dissolving 1g of 50% carbendazim wettable powder in 600mL of water) (the 50% carbendazim wettable powder solution is poured directly into the soil until it is thoroughly soaked), which can better prevent root diseases of the potted sparsely flowering juniper seedlings and promote their healthy growth.

[0042] According to the technical solution of the present invention, prior to the replanting, the ecological environment of the replanting point is further optimized, including:

[0043] a. Remove other vegetation at the return point;

[0044] b. Leveling the terrain and performing a second disinfection treatment on the soil at the return point;

[0045] c. Install a retaining wall on the water-facing side of the return point.

[0046] The ecological environment optimization of the regression point in this invention specifically includes: a) removing other vegetation at the regression point to prevent other vegetation from competing with the sparse-flowered juniper plant for water and nutrients, and ensuring that the sparse-flowered juniper plant can obtain sufficient water and nutrients.

[0047] b) Flat terrain is conducive to the even acquisition of water and heat by the sparsely flowering water juniper plants, enabling them to grow stably; by performing a second disinfection treatment on the soil at the return point, pathogens and pests in the soil can be eliminated, allowing the sparsely flowering water juniper plants to grow healthily.

[0048] c) Setting up a retaining wall on the water-facing side of the return point can reduce the scouring force of the floodwaters on the sparse flowering juniper plants and improve the survival rate of the sparse flowering juniper plants.

[0049] Furthermore, other vegetation at the return point can be cleared by harvesting and burning.

[0050] The present invention does not limit the material of the retaining wall; for example, it can be a stone retaining wall.

[0051] In this invention, leveling the terrain and performing a second disinfection treatment on the soil at the return point include: applying 20g of 50% carbendazim wettable powder per square meter of the return point and tilling the soil, which can better eliminate pathogens and pests in the soil and further enhance the growth capacity of the sparsely flowering water juniper plants.

[0052] In some implementations, setting up a retaining wall on the water-facing side of the return point includes setting up a retaining wall with a height of 50-60cm and a width of 15-20cm on the water-facing side of the return point, which can reduce the scouring force of floodwater on the sparse flowering juniper plants while saving building materials.

[0053] In some implementations, replanting includes: placing sparsely-flowered juniper saplings into planting holes at the replanting point in March or April each year, covering them with 10-12cm thick pebbles (2-3cm in diameter), filling the gaps with river sand and compacting it, covering them with topsoil until level with the ground, tamping it down, then surrounding the saplings with large pebbles (8-16cm in diameter), and watering them thoroughly after planting.

[0054] By covering the planting hole at the return point with a certain thickness of pebbles, compacting it with river sand, and then surrounding the seedling with large pebbles, the soil at the return planting site can be kept loose and have good water permeability and aeration, while reducing soil loss after river erosion. This improves the survival rate and preservation rate of wild-grown juniper.

[0055] According to the technical solution of the present invention, after replanting, the method further includes the management and maintenance of the thin-flowered juniper plants, including:

[0056] Within the first month after replanting, apply ABT3 rooting powder solution (dissolve 1g of ABT3 rooting powder in 100-150ml of 95% ethanol, add 60-80kg of water, and shake well) to the roots weekly to promote root growth in the thin-flowered juniper plants. Spray with 150mg / L gibberellin growth solution once a week to increase the growth rate of the thin-flowered juniper plants.

[0057] During the first and second months after replanting, check the survival rate of the plants weekly and water according to the soil moisture, watering thoroughly.

[0058] When the sparsely-flowered juniper plants experience their first flooding (the first flooding period generally refers to June to September each year, with the specific time depending on the annual climate), promptly support the seedlings and mound soil around them after the water recedes. In the first month after the water recedes, spray them with a solution of 0.3wt%~0.5wt% urea (dissolve 0.3~0.5kg of urea in 99.7~99.5kg of water) and a solution of 0.2wt%~0.3wt% potassium dihydrogen phosphate (dissolve 0.2~0.3kg of potassium dihydrogen phosphate in 99.7~99.5kg of water) 2~3 times. Each time, spray 150~300mL of water per plant to ensure that the sparsely-flowered juniper plants can promptly replenish the nitrogen and phosphorus nutrients needed for growth after flooding, promote the growth of the sparsely-flowered juniper plants, and recover as soon as possible.

[0059] This invention allows for the removal of weeds and shrubs around the *Myrica spp.* plant during the initial replanting phase, ensuring the plant receives sufficient water and nutrients. The initial replanting phase refers to the period before the *Myrica spp.* plant has stabilized after replanting. Since a large number of weeds will sprout after flooding at the replanting point, it is necessary to manually remove the weeds to allow the *Myrica spp.* plant to grow stably. Therefore, the initial replanting phase should be determined based on the actual growth condition of the *Myrica spp.* plant.

[0060] In some implementations, the monitoring of thin-flowered juniper plants is also included, including: investigating the survival rate of thin-flowered juniper plants in May and June, and investigating the retention rate of thin-flowered juniper plants in October.

[0061] Furthermore, in March and April of the second year after replanting, the survival rate, plant height, and basal diameter of the thinned-flowered juniper plants were investigated.

[0062] The present invention will be further described in detail below through specific embodiments.

[0063] Example 1

[0064] The field reintroduction method for sparsely-flowered juniper provided in this embodiment includes the following steps:

[0065] 1) The sandy river beach with more sediment deposition (Yanzhiba, Dianjun District, Yichang City (30°63′77″N, 111°33′78″E)) was selected as the regression point. In the sandy river beach, the flood season lasts for 4 to 4.5 months, the average annual rainfall is 1213 mm, the altitude is 45 to 50 m, the average annual temperature is 18.5℃, the lowest annual temperature is -4℃, and the highest annual temperature is 40℃.

[0066] 2) The one-year-old, two-year-old, and three-year-old sparsely-flowered juniper seedlings (500 seedlings of each age) propagated by cuttings were grown in the shade of the return point for 2 months to obtain one-year-old, two-year-old, and three-year-old sparsely-flowered juniper plants. In the first month, watering was done twice a week, and in the second month, watering was done once a week. During the growth of the sparsely-flowered juniper seedlings, the roots of the seedlings were disinfected twice. The first disinfection treatment included drenching the roots of the sparsely-flowered juniper seedlings with a 50% carbendazim wettable powder solution until the roots were thoroughly soaked.

[0067] 3) Remove other vegetation at the return point, level the terrain, and perform a second disinfection treatment on the soil at the return point. Construct a stone retaining wall with a height of 60cm and a width of 20cm on the water-facing side of the return point.

[0068] Leveling the terrain and performing a second disinfection treatment on the soil at the return point include: applying 20g of 50% carbendazim wettable powder per square meter of the return point and tilling the soil;

[0069] 4) Dig planting holes of 40cm×40cm with a spacing of 1.5m×1.5m between plants and rows. In March of each year, remove the non-woven bags from the thin-flowered water juniper plants and place them into the planting holes at the return point. Cover with 10cm thick pebbles, fill the gaps with river sand and compact it, cover with topsoil until it is level with the ground, tamp it down firmly, and then surround the seedlings with large pebbles. After planting, water thoroughly and cover the planting area along the direction of water flow with biodegradable weed control cloth, leaving only the thin-flowered water juniper seedlings exposed. Secure the weed control cloth with sand, gravel and ground nails.

[0070] 5) In the early stages of restoration, pay attention to removing weeds and shrubs around the thin-flowered water juniper plant;

[0071] Within the first month after replanting, irrigate the roots weekly with ABT3 rooting powder solution to promote root growth in the thinned-flower juniper plants. Spray with 150mg / L gibberellin growth solution once a week, ensuring that all leaves of the plant are moist but not clumped together.

[0072] During the first and second months after replanting, check the survival rate of the plants weekly and water according to the soil moisture, watering thoroughly.

[0073] When the sparsely flowering juniper plants are submerged during the first flood season, they should be supported and mulched with soil in time after the water recedes. In the first month after the water recedes, they should be sprayed twice with a solution of 0.3 wt% urea and 0.2 wt% potassium dihydrogen phosphate, with each spraying amount being 300 mL per plant.

[0074] 6) In June, investigate the survival rate of the thin-flowered juniper plants; in October, investigate the retention rate of the thin-flowered juniper plants; in March of the second year after replanting, investigate the survival rate, plant height, and basal diameter of the thin-flowered juniper plants.

[0075] Example 2

[0076] The method for the field reintroduction of sparsely-flowered juniper in this embodiment is basically the same as that in embodiment 1, except that: in step 4), dig planting holes of 40cm×40cm with a plant spacing of 1.5m×1.5m. In March of each year, remove the non-woven bag from the sparsely-flowered juniper plants and place them in the planting holes at the reintroduction point. Plant the plants upright and support them, cover them with topsoil until they are level with the ground, and tamp them down firmly.

[0077] Example 3

[0078] The method for the field reintroduction of sparsely-flowered juniper in this embodiment is basically the same as that in embodiment 1, except that: in step 4), dig planting holes of 40cm×40cm with a plant spacing of 1.5m×1.5m. In March of each year, place the sparsely-flowered juniper plants together with non-woven bags into the planting holes, cover them with 10cm thick pebbles, fill the gaps with river sand and compact it, cover them with topsoil until they are level with the ground, and tamp them down firmly.

[0079] Comparative Example 1

[0080] The field regression method for sparsely flowered water juniper in this comparative example is basically the same as that in Example 1. The difference is that a gravelly river beach with less sediment deposition was selected as the regression point in Yanzhiba, Dianjun District, Yichang City, as described in Example 1.

[0081] Comparative Example 2

[0082] The field regression method for sparsely flowered water juniper in this comparative example is basically the same as that in Example 2. The difference is that a gravelly river beach with less sediment deposition was selected as the regression point in Yanzhiba, Dianjun District, Yichang City, as described in Example 1.

[0083] Comparative Example 3

[0084] The field regression method for sparsely flowered water juniper in this comparative example is basically the same as that in Example 3, except that a gravelly river beach with less sediment deposition was selected as the regression point in Yanzhiba, Dianjun District, Yichang City, as described in Example 1.

[0085] Before being reintroduced into the wild, the average plant height and average basal diameter of the one-year-old, two-year-old, and three-year-old potted sparse-flowered juniper twigs are shown in Table 1.

[0086] Table 1

[0087]

[0088] In May and June (1 to 2 months after the wild reintroduction of Juniperus chinensis 'Sparse Flowering'), the survival rate of Juniperus chinensis 'Sparse Flowering' plants in each example and comparative example was counted. Survival rate = number of surviving plants / number of experimental plants × 100%. The results are shown in Table 2.

[0089] In October (after the wild reintroduction of Juniperus spp. to the wild was flooded during the flood season), the survival rate of Juniperus spp. plants in each example and comparative example was counted. The survival rate = number of plants saved / number of plants planted in the experiment × 100%. The results are shown in Table 2.

[0090] Table 2

[0091]

[0092] Analysis of Table 2 shows that after 1-2 months of reintroduction in the wild, the *Myricaria sparsely-flowered* plants in both the examples and the comparative examples exhibited high survival rates. However, after flooding during the flood season, the survival rate of the *Myricaria sparsely-flowered* plants in the examples was much higher than that in the comparative examples. This indicates that the wild reintroduction method of the present invention enables *Myricaria sparsely-flowered* to have excellent resistance to flooding and erosion, and that *Myricaria sparsely-flowered* has successfully adapted to the wild environment.

[0093] Furthermore, as can be seen from Examples 1-3, the survival rate and preservation rate of the thin-flowered juniper obtained by the planting method using weed control cloth and soil protection are higher than those obtained by the planting method using the removal of non-woven bags and the planting method using non-woven bags.

[0094] In March and April of the second year after the reintroduction of the plant, the survival rate, average plant height, and average basal diameter of the thin-flowered juniper plants in each example and comparative example were statistically analyzed. The results are shown in Table 3.

[0095] Table 3

[0096]

[0097] Analysis of Table 3 shows that after one growth cycle, the thinned-flowering juniper plants in Examples 1-3 had a high survival rate, and the average plant height and average basal diameter of the thinned-flowering juniper plants both increased slightly. In terms of seedling age comparison, the survival rate and retention rate of three-year-old thinned-flowering juniper plants were higher than those of one-year-old and two-year-old thinned-flowering juniper plants.

[0098] SPSS 20.0 was used to process and analyze the experimental data. The Duncan multiple comparison method was used to analyze the variance of the survival rate and retention rate of three-year-old sparsely flowering juniper plants in the field under different site conditions (i.e., sandy riverbank and gravelly riverbank) and planting methods (i.e., planting with weed control cloth, planting without non-woven bags, and planting with non-woven bags). The results are shown in Table 4.

[0099] Table 4

[0100]

[0101] Analysis of Table 4 shows that site conditions had no significant effect on the survival rate (P>0.05), but a highly significant effect on the retention rate (P<0.01). Planting methods had no significant effect on either the survival rate or retention rate of the sparsely-flowered Myrica rubra in the field reintroduction (P>0.05). The F-values ​​indicate that planting methods had a greater impact on the survival rate than site conditions, while site conditions had a greater impact on the retention rate than planting methods.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for the field reintroduction of sparsely-flowered juniper, characterized in that, include: Sandy riverbanks were used as the regression point for the replanting of sparsely flowering juniper plants. The replanting process includes: placing the sparsely flowering water juniper plants into the planting holes at the replanting point in March or April each year, covering them with 10-12cm thick pebbles with a diameter of 2-3cm, filling and compacting the gaps with river sand, covering them with topsoil until they are level with the ground, tamping them down, and then surrounding the seedlings with large pebbles with a diameter of 8-16cm. After planting, water them thoroughly. In the sandy riverbed, the flood season lasts for ≤5 months, the annual rainfall is 1000mm~1200mm, the altitude is 40m~150m, the average annual temperature is 17~19℃, the annual minimum temperature is ≥-9℃, and the annual maximum temperature is ≤42℃. The sparse-flowered water juniper plant was obtained by acclimatizing and cultivating the sparse-flowered water juniper seedlings in pots. The acclimatization and cultivation included growing the sparse-flowered water juniper seedlings in the shade of the return point for 2 months to obtain the sparse-flowered water juniper plant, wherein the watering was carried out 2 to 3 times a week in the first month and 1 to 2 times a week in the second month. During the growth of the sparsely flowering water juniper seedlings, the roots of the sparsely flowering water juniper seedlings are subjected to 2-3 first disinfection treatments. The first disinfection treatment includes: drenching the roots of the potted sparsely flowering juniper seedlings with a 50% carbendazim wettable powder solution; Following the replanting, the management of the thin-flowered juniper plants is also included, and the management includes: Within the first month after replanting, drench the roots weekly with ABT3 rooting powder solution to promote root growth in the thinned-flowering juniper plants, and spray weekly with a 100-150 mg / L gibberellin growth solution; and / or, For the first two months after replanting, check the plant's survival rate weekly and water according to soil moisture, ensuring thorough watering; and / or, When the sparsely flowering juniper plants are submerged during the first flood season, after the water recedes, support the seedlings and mound soil around them. In the first month after the water recedes, spray them with a solution of 0.3wt%~0.5wt% urea and 0.2wt%~0.3wt% potassium dihydrogen phosphate 2~3 times, with each spraying amount being 150~300mL per plant.

2. The field regression method according to claim 1, characterized in that, The replanting method includes at least one of the following: planting with weed control cloth, planting without non-woven bags, and planting with non-woven bags.

3. The field regression method according to claim 1 or 2, characterized in that, The sparsely-flowered water juniper seedlings include at least one of the following: one-year-old sparsely-flowered water juniper seedlings, two-year-old sparsely-flowered water juniper seedlings, and three-year-old sparsely-flowered water juniper seedlings.

4. The field regression method according to claim 1, characterized in that, Prior to the replanting, the ecological environment of the replanting site is optimized, including: a. Remove other vegetation at the regression point; b. Leveling the terrain and performing a second disinfection treatment on the soil at the regression point; c. Install a retaining wall on the water-facing side of the return point.

5. The field regression method according to claim 4, characterized in that, The leveling of the terrain and the second disinfection treatment of the soil at the return point include: Apply 20g of 50% carbendazim wettable powder per square meter of the described regression point and then till the soil.

6. The field regression method according to claim 4, characterized in that, Setting up a retaining wall on the water-facing side of the return point includes setting up a retaining wall with a height of 50-60cm and a width of 15-20cm on the water-facing side of the return point.

7. The field regression method according to claim 1, characterized in that, It also includes monitoring the sparsely flowering juniper plants, the monitoring including: The survival rate of thin-flowered juniper plants was investigated in May and June, and the retention rate of thin-flowered juniper plants was investigated in October. In March and April of the second year after replanting, the survival rate, plant height, and basal diameter of the thinned-flowered juniper plants were investigated.

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