Cultivation method of dendrobium officinale parasitizing on taxus chinensis stump

Abstract

The invention discloses a cultivation method of dendrobium officinale parasitizing on taxus chinensis stumps, and relates to the technical field of parasitic cultivation and bonsai modeling of medicinal plants and rare short trees. According to the method, short taxus chinensis trees are subjected to material selection, disinfection curing and water retention modification pretreatment, dendrobium officinale seedlings are subjected to seedling selection, seedling hardening and domestication and root promotion treatment, then a parasitic planting system is constructed by adopting a moss buffer layer in combination with a flexible fixing mode, and through cooperation with precise parasitic environment regulation and control and a scientific maintenance management system, the survival rate of the dendrobium officinale seedlings is increased. The stable parasitism of the dendrobium officinale and the taxus chinensis brachycarpus is realized. According to the method, the disease rate of the dendrobium officinale is effectively reduced, the medicinal component content of the dendrobium officinale is increased, meanwhile, the high-ornamental-value bonsai is formed by fusing the short wood and the dendrobium, resource recycling is achieved, remarkable ecological, economic and ornamental values are achieved, and industrialization replication can be promoted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medicinal plant and rare tree short wood parasitic cultivation and bonsai modeling, in particular to a cultivation method of Dendrobium candidum parasitizing on Taxus tree stump. BACKGROUND

[0002] The bottleneck of Dendrobium candidum cultivation is that the traditional Dendrobium candidum is usually cultivated by substrate potting, which easily leads to root zone hypoxia, creates favorable conditions for the growth of pathogenic bacteria, and makes the survival rate of Dendrobium candidum lower, usually ≤80%. At the same time, the single cultivation environment limits the accumulation of medicinal components (such as Dendrobium polysaccharide) of Dendrobium candidum, resulting in poor quality stability, which is difficult to meet the market demand for high-quality Dendrobium candidum.

[0003] Taxus short wood resources are idle: a large number of pruning short woods are produced in the process of artificial breeding of Taxus, which usually have a diameter of 3-8 cm and a length of 15-40 cm, and contain natural antibacterial components (taxanes). However, these short woods are not developed as "biological carriers" to develop a parasitic cultivation system in the prior art, which not only causes serious waste of resources, but also increases the processing cost of short woods, which does not conform to the concept of resource recycling.

[0004] Parasitic technology is blank: at present, the parasitic cultivation of Dendrobium candidum and tree short wood lacks an integrated scheme of "epiphytic fixation → modeling design → environmental adaptation". In the aspect of epiphytic fixation, the fixation method is rough, and iron wire binding is often used, which can easily damage the bark of tree short wood and destroy the basis of parasitism; in the aspect of modeling design, there is a contradiction between modeling and growth, and forcibly bending the short wood can cause stress reaction of Dendrobium candidum plants and affect growth; in the aspect of environmental adaptation, the environmental parameters such as temperature, humidity and light are not optimized for the "wood-grass" parasitic characteristics, and the adaptability is poor, which cannot provide suitable environmental conditions for the parasitism of the two. SUMMARY

[0005] In view of the above deficiencies in the prior art, the purpose of the present application is to construct a stable parasitic system of Dendrobium candidum and Taxus short wood, make full use of the antibacterial property of Taxus short wood, reduce the disease rate of Dendrobium candidum, and target the disease rate ≤5%; visually fuse the natural texture of Taxus short wood with the vitality of Dendrobium candidum, and improve the commodity premium space of the product; efficiently utilize the pruning short wood produced in the process of artificial breeding of Taxus, implement the "resource recycling" concept, reduce resource waste, and reduce environmental burden.

[0006] A cultivation method of Dendrobium candidum parasitizing on Taxus tree stump, comprising the following steps:

[0007] (1) Taxus short wood pretreatment: select healthy side branches of artificial breeding Taxus as short wood, the diameter of which is 4-6 cm, the length of which is 20-35 cm, and the natural bending, tubercle and bark texture are retained; the short wood is soaked in 50% carbendazim 800 times liquid for 25 minutes for disinfection, and then the short wood incision is sealed with beeswax; a mixed solution of 1% sodium alginate and 3% humic acid is sprayed on the surface of the short wood to form a water-retaining film;

[0008] (2) Dendrobium officinale seedling pretreatment: select 2-year-old tissue culture domestication seedlings as Dendrobium officinale seedlings, the height of which is 8-12 cm, the root length of which is ≥6 cm, and the leaf blade is dark green and the aerial roots are developed; 7 days before transplanting, the Dendrobium officinale seedlings are acclimated in an environment with a shading rate of 50% and a relative humidity of 80%; the roots of the acclimated Dendrobium officinale seedlings are soaked in 200 mg / L ABT rooting powder solution for 15 minutes;

[0009] (3) Parasitic cultivation: a fresh and live white moss with a thickness of 3-5 cm is wrapped around the roots of the pretreated Dendrobium officinale seedlings to form a moss buffer layer; using brown silk or degradable fiber tape, the Dendrobium officinale seedlings with the moss buffer layer are fixed on the pretreated Taxus short wood by "8-shaped winding method", the fixed interval is 1 plant per 12-15 cm, and the fixed tightness is determined by the standard of "slightly pulling without moving, new roots can be extended";

[0010] (4) Parasitic environment regulation: the temperature of the parasitic environment is controlled to be 24-28℃ during the day and ≥16℃ at night, and the difference between day and night is ≤10℃; the relative humidity of the air is controlled to be 75%-85%, and the water content of the short wood surface is maintained at 30%-40%; the light transmittance is regulated to be 60%-70% through shading net, among which the shading rate is 70% in summer and 60% in spring and autumn; ventilation is performed 3 times a day at 9:00, 14:00 and 18:00, and each time for 40 minutes;

[0011] (5) Maintenance and management: spray 3-4 times a week, and the moss is "slightly wet but not dripping water"; apply parasitic special nutrient solution every month, the formula of which is N-P-K = 10-8-18, and 2% Taxus extract is added, which is applied along the surface of the short wood by low-pressure spraying; replace 1 / 2 of the moss every 6 months; spray the compound solution of sophoramine 1000 times liquid and wood vinegar 500 times liquid every month; when black spot disease is found, spray pyraclostrobin 1200 times liquid for 2 times with an interval of 7 days.

[0012] Further, in step (3), the short wood of Taxus chinensis is shaped according to its natural form, and the shaping includes a straight trunk type, an inclined trunk type, or a jungle type; the straight trunk type is to vertically place the short wood, and Dendrobium officinale is symmetrically distributed along the main vein of the short wood; the inclined trunk type is to incline the short wood by 45-60 degrees, and Dendrobium officinale is randomly epiphytic; the jungle type is to combine 3-5 short woods, the height difference between the short woods is 10-25 cm, and Dendrobium officinale is randomly epiphytic.

[0013] Further, in step (4), the temperature is controlled by using an intelligent temperature box, and the humidity is controlled by using an atomization system and a transparent humidity cover.

[0014] Further, in step (5), the humidity of moss is monitored by using an infrared humidity sensor, and spraying is automatically triggered when the humidity is lower than the standard.

[0015] Further, the method further comprises a harvesting and rejuvenation step: after Dendrobium officinale blooms, old mature stem segments of ≥2 years are selected for harvesting for medicinal use, and young stems are reserved; old stems are pruned every spring, 2-3 nodes of each old stem are reserved, and new seedlings are supplemented, and the distance between the seedlings is adjusted to 13 cm after the seedlings are supplemented.

[0016] The method has the following beneficial effects:

[0017] 1. Ecological mutual promotion advantage: the taxane substances released by the short wood of Taxus chinensis can effectively inhibit the occurrence of root rot of Dendrobium officinale, and the incidence of Dendrobium officinale is ≤3% through practice verification; meanwhile, the trace CO2 produced by Dendrobium officinale through photosynthesis provides a certain material support for the short wood of Taxus chinensis, forming a positive feedback cycle of “bacteriostasis-photosynthesis”, and improving the stress resistance of the two, and realizing ecological mutual promotion.

[0018] 2. Breakthrough in ornamental value: the ancient and simple texture and natural bending of the short wood of Taxus chinensis are deeply integrated with the emerald green leaves and elegant inflorescences of Dendrobium officinale, and a visual collision of “static wooden art + dynamic plant vitality” is realized. The bonsai is suitable for high-end home, office and other scenes, and significantly improves the ornamental value and commercial value of the product.

[0019] 3. Medicinal and economic gain: in the parasitic cultivation environment of the method, the polysaccharide content of Dendrobium officinale is improved, because the parasitic environment stimulates the secondary metabolism of Dendrobium officinale, and promotes the accumulation of medicinal ingredients, which has extremely high medicinal and health care value. Meanwhile, the bonsai has a “ornamental-harvesting” dual function, and 1 time of planting can realize 3 years of continuous income, prolongs the business cycle, and brings significant economic gain to the grower.

[0020] 4. Resource recycling value: the method uses the pruned short wood produced by artificial breeding of Taxus chinensis as a cultivation carrier, instead of wild Taxus chinensis resources, effectively solves the problem of disposal of “pruned waste materials”, reduces resource waste and environmental burden, conforms to the concept of green development, and has good resource recycling value.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 A schematic diagram of the short wood pretreatment process of the present application;

[0023] Figure 2 A schematic diagram of the "moss buffer + 8-shaped winding" fixing method of Dendrobium officinale;

[0024] Figure 3 A modeling effect diagram of the direct drying type, inclined drying type and jungle type parasitic bonsai of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] A cultivation method of Dendrobium officinale parasitizing on a Taxus tree stump, comprising the following steps:

[0027] 1. Material pretreatment

[0028] Short wood of Taxus:

[0029] Material selection: strictly selected from healthy side branches of artificially propagated Taxus, ensuring that the short wood has a diameter of 4-6 cm, a length of 20-35 cm, and retains the natural bending, nodal tubercle and bark texture, thereby laying a good foundation for subsequent bonsai modeling.

[0030] Disinfection and solidification: the selected short wood is soaked in 50% carbendazim 800 times solution for 25 minutes to effectively kill the bacteria on the surface of the short wood; after soaking, the incision of the short wood is closed with beeswax to prevent water loss and avoid incision rotting.

[0031] Water retention modification: a mixed solution of 1% sodium alginate and 3% humic acid is sprayed on the surface of the short wood, and the mixed solution forms a water retention film on the surface of the short wood, which can maintain the humidity of the microenvironment around the short wood and provide suitable moisture conditions for the growth of Dendrobium officinale.

[0032] Dendrobium candidum seedling:

[0033] Seedling selection: Select 2-year-old tissue culture domesticated seedlings as cultivation seedlings, with a height of 8-12 cm, root length ≥6 cm, and dark green leaves and developed aerial roots, to ensure that the seedlings have strong growth vigor.

[0034] Seedling hardening: 7 days before transplanting, Dendrobium candidum seedlings were placed in an environment with a light shielding rate of 50% and a relative humidity of 80% for hardening treatment to enhance the adaptability of the seedlings to the subsequent parasitic environment.

[0035] Rooting treatment: After hardening, the roots of Dendrobium candidum seedlings were soaked in a 200 mg / L ABT rooting powder solution for 15 minutes to stimulate the growth of aerial roots and improve the adhesion of aerial roots to Taxus short wood.

[0036] 2. Parasitic cultivation process

[0037] Fixing system construction:

[0038] Moss buffer layer: Fresh and live white hair moss is selected and wrapped around the roots of Dendrobium candidum seedlings, with a thickness of 3-5 cm. This moss buffer layer can simulate the "water retention-air permeability" microenvironment of the natural epiphytic environment of Dendrobium candidum, and buffer the physical friction between Taxus short wood and Dendrobium candidum, protecting the root system of Dendrobium candidum.

[0039] Flexible fixation: Brown silk or biodegradable fiber is used to fix Dendrobium candidum seedlings with moss buffer layer on Taxus short wood using the "8-shaped wrapping method", with a fixed interval of 1 plant per 12-15 cm. The tightness is controlled to be "lightly pulled without moving, new roots can extend", ensuring the stable fixation of Dendrobium candidum seedlings and not affecting the growth and extension of new roots.

[0040] Potted landscape design: Based on the natural form of Taxus short wood, three core designs are created, and can be expanded according to actual needs:

[0041] Straight dry type: The Taxus short wood is placed vertically, and the Dendrobium candidum is distributed symmetrically along the "main vein" of the short wood, highlighting the order of "upright wood + layered leaves", with a simple and elegant design.

[0042] Inclined dry type: The Taxus short wood is inclined at an angle of 45°-60°, and the Dendrobium candidum is randomly attached to the short wood, creating a visual tension of "dynamic growth", with a dynamic design.

[0043] Jungle type: Select 3-5 segments of Taxus short wood for combination, with a height difference of 10-25 cm between short woods, and Dendrobium candidum randomly attached to the short wood, simulating the hierarchical feeling of natural communities, with a rich and diverse design, close to nature.

[0044] 3. Parasitic environment regulation

[0045] Temperature control: The parasitic environment temperature is controlled by an intelligent incubator. The daytime temperature is controlled at 24-28°C, and the nighttime temperature is ≥16°C, with a day-night temperature difference of ≤10°C. Suitable temperature and temperature difference conditions are conducive to the accumulation of nutrients in Dendrobium candidum and promote its growth and development.

[0046] Humidity control: The humidity is controlled by a misting system in cooperation with a transparent humidity cover to maintain the air relative humidity at 75%-85%, while ensuring that the short wood surface of Taxus chinensis contains 30%-40% water, providing a humid environment for the parasitism of Dendrobium candidum and Taxus chinensis.

[0047] Light control: The light transmittance is controlled by shading nets to maintain the light transmittance of the parasitic environment at 60%-70%. In summer, the shading rate is adjusted to 70% due to strong light; in spring and autumn, the shading rate is adjusted to 60% due to relatively mild light, to adapt to the shade-loving growth characteristics of Dendrobium candidum.

[0048] Ventilation control: Ventilation is performed 3 times a day at 9:00, 14:00, and 18:00, with each ventilation lasting 40 minutes. Good ventilation conditions can reduce the risk of disease breeding in the parasitic environment and ensure air circulation.

[0049] 4. Maintenance and management system

[0050] Water and fertilizer precision supply:

[0051] Watering: Spray 3-4 times a week, and use an infrared humidity sensor to monitor the moss humidity. When the moss humidity is lower than the "slightly wet without dripping water" standard, the spray is automatically triggered to ensure that the moss is always in an appropriate humidity state, providing stable water supply for Dendrobium candidum.

[0052] Fertilization: Apply parasitic special nutrient solution every month. The nutrient solution formula is N-P-K=10-8-18, and 2% Taxus chinensis extract is added to promote the exchange of substances between Dendrobium candidum and Taxus chinensis. When fertilizing, use low-pressure spraying along the surface of the short wood to avoid washing away the moss at the root.

[0053] Moss replacement and renewal: Replace 1 / 2 of the moss every 6 months to supplement the organic matter in the moss and maintain the vitality of the moss buffer layer to ensure the normal functioning of its "water retention-air permeability" function.

[0054] Green pest control:

[0055] Prevention: Spray a compound solution of sophoramine 1000 times and wood vinegar 500 times every month. This compound solution is a biological agent that can effectively repel pests such as aphids and red spiders, and will not affect the medicinal safety of Dendrobium candidum.

[0056] Treatment: When the Dendrobium candidum appears black spot disease, spray 25% pyraclostrobin 1200 times liquid in time, spray continuously for 2 times, interval 7 days each time, which can effectively inhibit the spread of black spot disease and protect the healthy growth of Dendrobium candidum.

[0057] 5. Harvesting and rejuvenation

[0058] Harvesting: After Dendrobium candidum flowers, select ≥2-year-old mature stem segments for harvesting for medicinal use; at the same time, retain young stems to maintain the ornamental value of the bonsai and realize the dual functions of "ornamental-harvesting".

[0059] Rejuvenation: Prune the old stems of Dendrobium candidum every spring, retain 2-3 nodes per old stem, promote the germination of new stems; at the same time, supplement new seedlings, adjust the distance between seedlings to 13 cm after supplementing, continuously update the vitality of bonsai, and prolong the commercial cycle of bonsai.

[0060] Example 1

[0061] 1. Material preparation

[0062] Taxus short wood: Select Taxus short wood obtained by pruning artificial cuttage seedlings, diameter 5 cm, length 30 cm, and retain natural bending and bark texture to ensure that the short wood is legal and healthy.

[0063] Dendrobium candidum seedlings: Select tissue culture seedlings with a height of 10 cm and a root length of 8 cm, which have been domesticated for 8 months, with dark green leaves and developed aerial roots.

[0064] Environmental equipment: Prepare an intelligent temperature and humidity box (temperature control accuracy ±0.5℃, humidity control accuracy ±3%), an automatic spraying system, and a shading net with a light transmittance of 65%.

[0065] Other materials: 50% carbendazim, beeswax, 1% sodium alginate, 3% humic acid, 200mg / L ABT rooting powder, fresh and live white moss, brown silk, parasitic special nutrient solution (N-P-K=10-8-18, add 2% Taxus extract), matrine, wood vinegar, and 25% pyraclostrobin.

[0066] 2. Operation steps

[0067] Taxus short wood pretreatment: Cut the selected Taxus short wood, retain the natural bending of the short wood during sawing, and polish the edges of the short wood with 240 mesh sandpaper after cutting to prevent scratching the operator and Dendrobium candidum; mark the "texture densest surface" of the short wood as the subjective ornamental surface to facilitate subsequent concentrated fixation of Dendrobium candidum; immerse the treated short wood in 50% carbendazim 800 times liquid for 25 minutes, and seal the incision with beeswax after immersion; spray a mixture of 1% sodium alginate and 3% humic acid on the surface of the short wood to form a water retention film.

[0068] Pre-treatment of Dendrobium candidum seedlings: The selected Dendrobium candidum seedlings were placed in an environment with 50% shading rate and 80% relative humidity for 7 days before transplanting; after the hardening-off, the roots were soaked in 200 mg / L ABT rooting powder solution for 15 minutes.

[0069] Parasitic cultivation: After the fresh and live white hair moss was soaked and moisturized, it was wrapped around the roots of the Dendrobium candidum seedlings to form a "cylindrical shape" with a diameter of 6-8 cm, ensuring complete coverage of the aerial roots; the Dendrobium candidum seedlings were fixed by wrapping brown silk around the short wood from the bottom upwards using the "8-shaped winding method", with 3 windings for each plant, ensuring that the root system of the Dendrobium candidum seedlings was closely attached to the short wood; after planting, 800 times of special nutrient solution for parasitism was sprayed, then a transparent moisture-proof bag was put on, and the moisture-proof bag was removed after 5 days to let the Dendrobium candidum seedlings adapt to the parasitic environment.

[0070] Parasitic environment regulation: The temperature was controlled by an intelligent temperature and humidity box, maintaining 24-28℃ during the day and ≥16℃ at night, with a day-night temperature difference of ≤10℃; the humidity was regulated by the atomization system and transparent moisture-proof cover, maintaining the air relative humidity at 75%-85% and the short wood surface water content at 30%-40%; the light was regulated by shading net with 65% transmittance, with an additional layer of auxiliary shading net with 50% shading rate during the high-temperature period in summer (10:00-16:00) to make the total shading rate reach 70%, and only keeping the shading net with 65% transmittance in spring and autumn to adapt to the shade-loving characteristics of Dendrobium; the ventilation system was turned on at 9:00, 14:00, and 18:00 every day, with 40 minutes of ventilation each time, and the CO2 concentration was monitored synchronously during ventilation to ensure that the concentration was maintained at 400-600 ppm, meeting the photosynthesis needs of Dendrobium.

[0071] Maintenance and management: The moss humidity was monitored in real time by an infrared humidity sensor, and when the monitoring value was lower than the "slightly wet without dripping water" threshold (water content about 60%-70%), the spraying system was automatically triggered, with a spraying frequency of 3-4 times per week and a spraying time of 15-20 seconds each time to avoid water accumulation in the moss; the special nutrient solution for parasitism was applied on the 10th of each month, and after dilution to 800 times, the nutrient solution was sprayed slowly along the short wood surface by low-pressure spraying equipment (pressure 0.1-0.2 MPa), with a spraying amount of 50-80 mL per plant to prevent the moss from being washed away; the moss was renewed once in May and November each year, and 50% of the aged moss on the short wood was carefully peeled off, and fresh white hair moss was planted, and after planting, 500 times of humic acid solution was sprayed to promote the colonization of the moss; on the 20th of each month, a compound solution of 1000 times of sophoridine and 500 times of wood vinegar was sprayed, ensuring that the leaves and the surface of the short wood were evenly covered, with a dosage of 100-120 mL per square meter; if black spots (early symptoms of black spot disease) were found on the leaves, 25% pyraclostrobin 1200 times solution was immediately sprayed, and the second spraying was performed after 7 days, avoiding ventilation and spraying within 24 hours after spraying to improve the efficacy.

[0072] Harvesting and rejuvenation: After the Dendrobium officinale flowers wither (usually in April-May each year), select 2-year-old or older mature stem segments with a stem diameter ≥0.8 cm and full internodes for harvesting. At the time of harvesting, use sterilized scissors to cut off the stem 2-3 internodes away from the stem base, leaving the young stems and the base roots. Rejuvenation treatment is performed in early March each year, all old stems are pruned (2-3 healthy bud points are retained), and plants with weak growth are removed. New domesticated seedlings with a plant height of 10-12 cm are supplemented, the distance between seedlings is adjusted to 13 cm after supplementation, and 200 mg / L ABT rooting powder solution is sprayed once after the supplementation is completed to promote the adhesion of the new seedling roots.

[0073] Periodic monitoring and recording: After planting, the plant height of Dendrobium officinale, the number of new stem sprouts, and the aerial root coverage of the short wood are recorded every month; the polysaccharide content of Dendrobium officinale is detected every three months (using high-performance liquid chromatography) to ensure that the content is maintained at more than 25%; the disease incidence is calculated annually (disease incidence = number of diseased plants / total number of plants x 100%) and controlled within 3%; and the bonsai ornamental period and commercial benefits are recorded.

[0074] Ecological benefit verification

[0075] The cultivation scheme in Example 1 is selected for comparison test with traditional substrate potting (control group), and the test period is 12 months, and the results are as follows:

[0076] Disease incidence: The incidence of Dendrobium officinale root rot in the present application group is 2.1%, and the control group is 18.5%; the short wood rot rate of Taxus chinensis in the present application group is 0.8%, and the control group (traditional binding method) is 12.3%, which proves that the antibacterial property of Taxus chinensis short wood and the flexible fixing method effectively reduce the disease risk.

[0077] Resource utilization rate: The present application can consume 3000-5000 kg / ha of artificially propagated Taxus short wood pruning each year, and the short wood recycling period is 3-4 years. Compared with the traditional short wood incineration treatment, CO2 emission is reduced by about 1.2 tons / ha per year, and resource recycling is achieved.

[0078] In the parasitic cultivation environment of the present application, the secondary metabolism of Dendrobium officinale is stimulated, and the accumulation of medicinal ingredients is promoted, which has very high medicinal and health care value. And the bonsai is suitable for high-end home, office and other scenes, which significantly improves the ornamental value and commercial value of the product.

[0079] The above only describes the preferred embodiments of the present application patent, and is not intended to limit the present application patent. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application patent should be included in the protection scope of the present application patent.

Claims

1. A method for cultivating Dendrobium officinale parasitizing on yew tree stumps, characterized in that, Includes the following steps: (1) Pretreatment of short yew wood: Select healthy lateral branches of artificially propagated yew as short wood. The short wood has a diameter of 4-6 cm and a length of 20-35 cm, and retains natural curvature, knots and bark texture. Soak the short wood in 50% carbendazim solution at 800 times dilution for 25 minutes for disinfection, and then seal the cut of the short wood with beeswax. Spray a mixture of 1% sodium alginate and 3% humic acid on the surface of the short wood to form a water-retaining film. (2) Pretreatment of Dendrobium officinale seedlings: Two-year-old tissue culture seedlings were selected as Dendrobium officinale seedlings. The seedlings were 8-12cm tall, with roots ≥6cm long, dark green leaves, and well-developed aerial roots. Seven days before transplanting, the seedlings were hardened off in an environment with 50% shading and 80% relative humidity. The roots of the hardened seedlings were soaked in 200mg / L ABT rooting powder solution for 15 minutes. (3) Parasitic planting: After pretreatment, Dendrobium officinale seedlings are wrapped with fresh white moss with a thickness of 3-5cm to form a moss buffer layer; using palm fiber or biodegradable fiber tape, Dendrobium officinale seedlings with moss buffer layer are fixed to pretreatment yew short wood using the "figure-eight wrapping method", with a fixing spacing of 12-15cm per seedling, and the fixing tightness is based on the standard of "not being able to be pulled lightly and new roots can extend"; (4) Control of parasitic environment: Control the temperature of the parasitic environment to 24-28℃ during the day and ≥16℃ at night, with a day-night temperature difference of ≤10℃; control the relative humidity of the air to 75%-85%, and maintain the surface moisture content of the short wood at 30%-40%; control the light transmittance to 60%-70% through shading nets, with a shading rate of 70% in summer and 60% in spring and autumn; ventilate 3 times a day, at 9:00, 14:00 and 18:00, for 40 minutes each time; (5) Maintenance and management: Spray 3-4 times a week, with the standard being that the moss is "slightly moist but not dripping water"; apply a special nutrient solution for parasitic growth every month. The nutrient solution formula is NPK=10-8-18, with 2% yew extract added. Apply it along the surface of the short wood using a low-pressure spray method; replace 1 / 2 of the moss every 6 months; spray a compound solution of 1000 times dilution of matrine and 500 times dilution of wood vinegar every month; when black spot disease is found, spray 1200 times dilution of 25% pyraclostrobin, spraying twice consecutively with an interval of 7 days.

2. The cultivation method of Dendrobium officinale parasitizing on a yew tree stump according to claim 1, characterized in that: In step (3), bonsai are shaped according to the natural form of the short yew wood. The shapes include straight trunk, slanted trunk, or jungle style. The straight trunk style is to place the short wood vertically and distribute Dendrobium officinale symmetrically along the "main vein" of the short wood. The slanted trunk style is to tilt the short wood at 45° to 60° and let Dendrobium officinale grow in a staggered manner. The jungle style is to combine 3 to 5 pieces of short wood with a height difference of 10 to 25 cm between the short woods and let Dendrobium officinale grow randomly.

3. The cultivation method of Dendrobium officinale parasitizing on a yew tree stump according to claim 1, characterized in that: In step (4), an intelligent temperature chamber is used to regulate the temperature, and an atomization system and a transparent moisturizing cover are used to regulate the humidity.

4. The cultivation method of Dendrobium officinale parasitizing on a yew tree stump according to claim 1, characterized in that: In step (5), an infrared humidity sensor is used to monitor the humidity of the moss, and spraying is automatically triggered when the humidity is lower than the standard.

5. The cultivation method of Dendrobium officinale parasitizing on a yew tree stump according to claim 1, characterized in that: It also includes harvesting and rejuvenation steps: after Dendrobium officinale flowers, select mature stem segments that are ≥2 years old for medicinal use, and retain young stems; Every spring, prune the old stems, leaving 2-3 nodes on each old stem, and at the same time replant new seedlings, adjusting the spacing between seedlings to 13cm after replanting.

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