CN110810100B - A kind of method for sowing and raising seedlings of Zinan in winter - Google Patents

Abstract

The invention discloses a method for planting seedlings and afforestation of Zinan in winter. The method uses coarse sand to grind the seed coat, breaks the seed dormancy, and directly accelerates germination sowing in winter. The germination rate reaches over 90%. Reduce seedling time, reduce seed mildew loss, and improve germination rate. Zinan seedlings are susceptible to sunburn during the breeding process, the terminal buds are damaged and the growth is slow, and there are many side branches, making it difficult for direct afforestation. , The cultivated seedlings grow neatly, with few and short side branches, and the main trunk is upright, which ensures the quality of the afforestation seedlings and significantly improves the usability and ornamental value of Zinan wood. Zinan is an evergreen tree, and it is mixed with a variety of deciduous tree species for afforestation to achieve complementary advantages between species and improve the species richness, diversity and stability of forest land. This method provides technical support for the artificial propagation and seedling afforestation of Zinan precious wood forest.

Description

Method for sowing, seedling raising and afforestation of photinia serrulata in winter

Technical Field

The invention belongs to the technical field of forest cultivation, and particularly relates to a method for planting, seedling and afforesting Photinia serrulata in winter.

Background

Photinia serrulata (A. serrulata)Phoebe sheareri(Hemsl.) Gamble belongs to the family LauraceaeLauraceae) Genus Machilus (A)Phoebe) The method is a specific subtropical evergreen broad-leaved tree species in China, and national level II is mainly used for protecting wild plants, and the wild plants are generally distributed in mountain broad-leaved forests with the altitude of 500m to 1000 m. The height of the phoebe nanmu tree can reach 30m, and the diameter at breast height is 40-50 cm. The bark is light grey brown, and the bud, tender leaf, twig and inflorescence are densely covered by tawny villi. The leaves are intergrown, and the shape of the inverted egg or inverted egg is like a needle, the length is 10.0-23.5cm, and the width is 3.5-8.0 cm; the petiole is flocked with yellow brown hair, and the length of the petiole is 1.5-2.5 cm. A coniform inflorescence with the length of about 7 cm; the bract is rectangular and 1.5mm long; the flower is small, and the diameter is 5-7 mm; the ball-shaped ovary and the style have no hair. Oval berry with length of 8-10mm, green when the pericarp is immature, black when mature, gray brown seed, and oval shape. The flowering period is 5-6 months, and the fruit ripening period is 10-11 months. The photinia serrulata has less plant diseases and insect pests, long service life, favors warm and humid environment, requires acid soil with good drainage, deep and loose property and pH of 5.2-6.0 for growth. The Photinia serrulata is beautiful in tree shape and is tree-throughThe tree can be used as a shade tree, a greening tree and a landscape tree; also has good windproof and fireproof functions, and can be planted as a protective forest belt; the wood is hard and corrosion resistant, is a famous precious wood tree species in the world, and can be used as high-grade furniture, building decoration, artware and the like; the seed contains oil, and can be used for preparing lubricant or soap by squeezing oil.

In recent years, forest areas in China are increased year by year, and the first-seen effect of national greening is achieved, but the tree species are single, the fast-growing tree species are multiple, the precious tree species are few, so that precious wood in China is lacked, and a large amount of precious wood is imported from abroad every year. At present, China is vigorously promoting rare plants and native tree species to breed and afforest so as to increase strategic reserve of precious wood, promote biological diversity and improve forest quality. The phoebe nanmu is widely popularized and planted as a tree for precious materials and a tree species in the local area. However, the wild resources of the photinia serrulata are few (the existing resources are limited, the wild resources are distributed in a large amount and a small area, the wild resources are generally distributed sporadically in a small community in a deep mountain valley or in a windy and watery forest land in a remote rural area, and most of the wild resources are secondary forests germinated after random cutting damage); the phoebe nanmu seed episperm has poor air permeability and poor water absorption, has the characteristic of dormancy, and has extremely low seed field germination rate. Therefore, artificial breeding is an effective way for solving the problems of resource protection, afforestation popularization and wood demand of the photinia serrulata.

The Phoebe Machilus seeds have the characteristic of dormancy due to the limitation of episperm, are easy to deteriorate in storage, have low germination rate and are a great obstacle to artificial propagation, seedling culture and forestation. The artificial breeding germination rate of the phoebe nankinensis seeds is about 65 percent, the phoebe nankinensis seeds are not storable, the spring breeding germination rate can be reduced by 10 to 20 percent, low-temperature treatment and temperature-changing stratification sand storage are needed, the conditions are complicated, gaps among the phoebe nankinensis seedlings on the market are large, and the landscaping and ecological forestation construction of the phoebe nankinensis seeds of rare rural trees is hindered to a certain extent. The growth of the photinia fraseri seedlings needs shading, the seedlings are not cultivated, direct afforestation is carried out, the growth of the photinia fraseri is slow, lateral branches are more, trunks are not obvious or more and more fine, and the value of the forest for the valuable materials of the photinia fraseri is reduced. The photinia serrulata is mostly in a mixed crossing state with deciduous tree species under natural conditions, is generally in the middle-lower layer, and is independently used for blind afforestation, so that the growth of the photinia serrulata is inevitably influenced. The research explores the aspects of improving the germination rate of the phoebe nanniensis, culturing the qualified forestation seedlings, utilizing the phoebe nanniensis for forestation and the like, and provides technical support for artificial seedling raising and forestation of the phoebe nanniensis forest.

Disclosure of Invention

In order to solve the problems that the germination rate of the artificial seedling culture of the phoebe nana is low, the requirement of forestation cannot be met by seedling culture in the early stage, the method for forestation by utilizing the phoebe nana and the like, the method adopts winter germination acceleration and sowing (along with sowing), and improves the germination rate; the Photinia fraseri seedlings are easily burned in the breeding process, the tops of the Photinia fraseri seedlings are easily injured, the growth of the main trunk is influenced, the seedlings cannot meet the afforestation requirement, small trees are utilized for shading naturally, obvious main trunks are shaped, qualified afforestation seedlings are cultured, and then the qualified afforestation seedlings are mixed with various deciduous tree species for afforestation, so that the problem of Photinia fraseri seedling culture and afforestation is solved.

The purpose of the invention can be realized by the following technical scheme:

the method for sowing, seedling raising and afforesting the photinia serrulata in winter preferentially comprises the following steps:

1) seed collection: the maturing time of the phoebe nanseri seeds is 10 middle ten days to 11 last days, the testa is changed from green to purple brown for collection, strong and disease-free seeds of the mother tree for more than 15 years are collected, fresh fruits are collected and put into clear water for soaking for 15-20h, the outer peel of the pulp is removed by rubbing, after the fruits are cleaned, the seeds which float on the water surface and are shrunken and not full are removed, the seeds are fished out, and the house is naturally dried in the shade;

2) accelerating germination and sowing in winter: mixing plant ash with seeds dried in the shade, rubbing off oil on the surfaces of the seeds, then using coarse sand mixed with a small amount of broken stones, lightly tamping and rubbing until the color of seed coats changes from grey brown to grey white, wherein partial irregular abrasion occurs, soaking for 20-30min by using 15% hydrogen peroxide solution, then soaking the seeds for 2 days by using warm water at 35-40 ℃, then sowing, selecting the seeds exposed to the sun and leveled land blocks, paving a sand bed by using river sand with proper thickness, wherein the sand bed has the east-west trend, the width is 1.5-2.0m, the thickness is 15-20cm, after the sand bed is sterilized, watering thoroughly for sowing, uniformly scattering the seeds on the sand bed, covering fine sand with the thickness of 2-3cm, spreading, covering the seeds with straw with the thickness of 1-2cm, keeping the humidity, keeping the temperature in winter lower, building a plastic greenhouse, and keeping the temperature of the sand bed to prevent low-temperature freezing injury in winter;

3) transplanting the bud seedlings in spring: bare root transplanting is carried out at the bottom of 2 months to the beginning of 3 months in spring, flat leeward land blocks are selected for land preparation before transplanting, weed and broken stones are removed, base fertilizer is applied by mechanical deep ploughing, 50% carbendazim wettable powder is used for soil disinfection, the growth of the photinia serrulata is easy to cause sunburn, a row of photinia serrulata with the plant spacing of 1.5-2m is planted on two sides of each nursery land before transplanting, natural shading is provided to prevent sunburn, root breaking treatment is carried out before transplanting, 5-8cm main roots are kept, holes are dug during transplanting, the size is about 10cm multiplied by 10cm, the transplanting row spacing is 10-15cm, the plant spacing is 5-10cm, sufficient water is irrigated after transplanting seedlings, a shading net with the light transmittance of about 60% -70% is built for shading, and the transplanting survival rate can be remarkably improved;

4) seedling management: watering, watering once every other week before complete survival after transplanting, keeping soil moist, watering according to drought conditions after survival, weeding artificially at proper time, applying a compound fertilizer for 7-8 months of quick growth according to the growth conditions of seedlings, wherein 40-50kg of compound fertilizer is applied per mu, the fertilizer is uniform, the fertilizer is prevented from being directly contacted with the roots and leaves of the seedlings, the photinia fraseri has strong disease resistance, relatively few plant diseases and insect pests, the insect pests mainly comprise red spiders, damage tender stems and terminal buds, and can be controlled by spraying 2000 times of 5% cypermethrin 1500-;

5) afforestation technology: the method comprises the following steps of selecting valley shade slopes or low-hilly mountain areas for afforestation in an afforestation site, firstly configuring tree species, carrying out mixed hybridization with deciduous tree species such as horse chestnut, zelkova, liquidambar formosana and the like for afforestation, configuring more than 3 tree species (including) and finishing the cleaning work of the afforestation site before afforestation, carrying out block soil preparation, wherein the row spacing of the afforestation plants is 1m multiplied by 1m or 1m multiplied by 2m, and selecting seedling transplanting with the growth height of more than 2 years and with obvious trunk, wherein at the moment, the photinia japonica seedlings have cold resistance, are not easily frozen in winter, and the planting proportion of mixed hybridization of the three tree species for afforestation is 60%: 20%: 20%, and the planting proportion of the mixed afforestation of the four tree species is 50%: 20%: 20%: 10 percent, the mixed planting proportion of the photinia serrulata is not less than 50 percent, pit holes are dug in advance, the size of each pit hole is 30cm multiplied by 30cm, about 15-20g of compound fertilizer is placed at the bottom of each pit hole to serve as base fertilizer, seedlings are planted into the pit holes to be compacted and watered sufficiently, the survival condition of planting is counted after one month, seedling supplement is paid attention, tending is carried out within the first three years after planting, fertilizer is applied once every spring, and weeding is paid attention to well for pest control.

Further, the step 1) requires that the thousand seed weight of the collected photinia serrulata seeds is between 302.3 and 305.4 g.

Further, the mixing ratio of the phoebe nanmu seeds and the coarse sand crushed stones in the step 2) is 3: 1.

further, the sowing amount of the phoebe nanmu seeds in the step 2) is 0.5kg per square meter.

Furthermore, a thermometer is placed in the sand bed in the step 2), the plastic greenhouse needs to be unfastened when the temperature is higher than 30 ℃, ventilation and dehumidification are carried out, and seeds are easy to mildew due to overhigh temperature and overhigh humidity.

Further, the sand bed in the step 2) is disinfected by 3 percent ferrous sulfate aqueous solution, and the dosage of the ferrous sulfate aqueous solution is 8 to 10L per square meter.

Further, the bud seedling transplantation in the step 3) is carried out on rainy days.

Further, the step 3) is to carry out deep ploughing and base fertilizer application on the plots, wherein the application amount is 30-40 kg of compound fertilizer per mu and 150-180 kg of organic fertilizer per mu.

Further, the sunshade net in the step 3) is generally kept for about 20-30 days, and the sunshade net is removed after the seedlings completely survive.

Further, the soil preparation work in the step 5) is finished 1-2 months before afforestation.

Further, the afforestation time of the step 5) is 2-3 months.

Furthermore, 50% of leaves are cut off when the phoebe nanmu is transplanted for forestation in the step 5), so that the water and nutrient consumption is reduced, and the survival rate is improved.

The invention has the beneficial effects that:

the method adopts coarse sand to break the seed testa, increases air permeability, breaks seed dormancy, and improves the germination rate by more than 25%. Compared with the conventional variable-temperature stratification sand-storage spring sowing, the winter germination accelerating sowing (simultaneous-harvest and simultaneous-sowing) is adopted, so that the seed mildew is reduced, the germination rate is improved, and the germination rate is more than 90% (table 1); the method can be used for sowing along with picking in winter, is simple to operate and shortens the seedling raising time. Shading and root cutting are adopted for bud seedling transplantation in spring, so that the transplantation survival rate reaches more than 97% (table 2 and figure 1), and the survival rate of bud seedling transplantation is ensured. The Photinia serrulata seedlings are easy to be scorched in the breeding process, have more lateral branches and slow trunk growth, small trees, namely acer palmatum, prunus cerasifera and the like are planted on two sides of a seedling nursery, natural shading is utilized, the sunburn phenomenon is prevented, the lateral branch growth of the Photinia serrulata is inhibited, the trunk growth is promoted, and then greening and forestation are carried out. In the forestation process, the Chinese medicinal preparation is mixed with various deciduous tree species for forestation, so that inter-species advantage complementation is realized, the deciduous tree species provide shading conditions for the growth of the photinia serrulata in summer, and the photinia serrulata is prevented from being directly exposed to sunlight to influence normal growth; the fallen leaves of the fallen leaves tree in winter can provide sufficient sunlight for the growth of the photinia serrulata, and the growth of the photinia serrulata in winter can not be influenced. The photinia serrulata is called as 'golden silk photinia', and is mixed with various deciduous tree species, so that the simple fast-growing tree species is subjected to afforestation, the forest quality is improved, the forest ecological system is improved, the biodiversity and the ecological environment construction are promoted, and 'the effects of preserving treasure in mountains and preserving people' are achieved.

Drawings

FIG. 1, a shading net is built for shading after transplanting the photinia fraseri bud seedlings.

Fig. 2 does not provide the cultivation condition of the shady phoebe nanmu seedlings, and the phoebe nanmu seedlings with multiple trunks (A) or multiple lateral branches (B) can be seen from fig. 2.

Fig. 3 provides the cultivation condition of naturally shaded seedlings, and the main trunk of the photinia fraseri is obvious and lateral branches are short and few as can be seen from fig. 3.

Detailed Description

Example 1: method for sowing, seedling raising and afforestation of photinia serrulata in winter

Planting materials: the method is characterized in that the Photinia serrulata seeds are collected and transplanted in a plant research institute of Chinese academy of sciences of Jiangsu province and forested in a base of Guomei agriculture and technology Limited company of Changzhou city, and the forest land is a southern low mountain hilly land.

1) Photinia serrulata seed collection

And in 11 middle-month ten days, when the exocarp of the Phoebe Machilus fruit is changed from greenish to purple brown, collecting full seeds of a robust and disease-free mother tree for more than 15 years. Soaking the collected fruits in clear water for 15h, removing pulp and peel, cleaning in clear water, removing shrunken and non-full seeds floating on the water surface, taking out the seeds, and naturally drying in the shade indoors.

2) Winter germination accelerating and seeding

Mixing the seeds dried in the shade with plant ash, rubbing off oil on the surfaces of the seeds, mixing the seeds with coarse sand mixed with a small amount of broken stones at a ratio of 1:3, rubbing until the seed coat color is changed from grey brown to grey white, and partial irregular abrasion occurs, soaking the seeds in 15% hydrogen peroxide solution for 30min, soaking the seeds in warm water at 35 ℃ for 2 days, and then sowing the seeds. Selecting a land which is exposed to the sun by wind, has flat terrain and smooth drainage and is close to the nursery land as a sand bed. Preparing river sand with proper thickness, laying a sand bed, and disinfecting the bed bottom before laying the sand bed to kill underground pests. The sand bed has a east-west direction, a width of 1.5m and a thickness of 15cm, and is surrounded by bricks. Disinfecting the sand bed with 3% ferrous sulfate aqueous solution, wherein the dosage of the ferrous sulfate aqueous solution is 8L per square meter; and (3) after the sand bed is disinfected, thoroughly watering and sowing, wherein the sowing amount is 0.5kg per square meter. Uniformly scattering seeds on a sand bed, covering with fine sand with the thickness of 2cm, flattening, covering with straw with the thickness of 1cm to keep the humidity, building a plastic greenhouse when the temperature is low in winter, and keeping the temperature of the sand bed to prevent low-temperature freeze injury in winter.

3) Spring sprout transplantation

Bare root transplanting is carried out in the early 3 months of spring, flat sunny land is selected for land preparation before transplanting, weed and broken stones are removed, base fertilizer is applied by mechanical deep ploughing, 40kg of compound fertilizer is applied to each mu, and 50% carbendazim wettable powder is used for soil disinfection. The phoebe nanmu grows and is easy to sunscald, and before transplanting, one row of prunus cerasifera with the height of about 1m and the plant spacing of 2m is planted on the two sides of each nursery, so that natural shading is provided, and sunscald is prevented. The root is cut off before transplanting, 5cm of main roots are kept, pit holes of about 10cm multiplied by 10cm are dug by a small shovel during transplanting, the transplanting row spacing is 10cm, the plant spacing is 5cm, soil is filled after seedlings are planted into the pit holes, the seedlings are compacted, flood irrigation is carried out, sufficient water is filled, a sunshade net with the light transmittance of about 60% -70% is built for shading, and the transplanting survival rate can be remarkably improved.

4) Seedling management

Seedling management: watering, watering once every other week before complete survival after transplanting, keeping soil moist, watering according to drought conditions after survival, weeding artificially in due time, applying compound fertilizer once per mu in 7-8 months of rapid growth according to the growth conditions of seedlings, wherein the fertilizer application is uniform and avoids direct contact with the roots and leaves of the seedlings. The disease resistance of the photinia serrulata is strong, the plant diseases and insect pests are relatively few, the plant diseases and insect pests are mainly red spiders, and tender stems and terminal buds are damaged; 5% cypermethrin 15000 times liquid can be sprayed for prevention and treatment, diseases generally cause bacterial infection of leaves, so that the edges of the leaves are brown, and 800 times liquid of 75% chlorothalonil can be sprayed for prevention and treatment.

5) Afforestation technology

The method is characterized in that a forestation land is a low mountain hill, tree species are firstly configured, mixed forestation with deciduous tree species horse chestnut and zelkova is carried out, the cleaning work of the forest land is completed before the forestation, block soil preparation is adopted, the row spacing of forestation plants is 1m multiplied by 1m, the forestation selects seedling transplantation with the growth height of 2 years and the obvious trunk height of more than 40cm, at the moment, the phoebe nanmu seedlings have cold resistance, the seedlings cannot be frostbitten when encountering low-temperature cold tide after winter, and the planting proportion of the mixed forestation of the three kinds of trees is 60 percent: 20%: 20 percent, digging a pit in advance, wherein the size of the pit is 30cm multiplied by 30cm, 15g of compound fertilizer is placed at the bottom of the pit to be used as a base fertilizer, the seedlings are planted in the pit, compacted and watered sufficiently, a sunshade net is used for shading, the condition of afforestation survival is counted after one month, and the seedlings are paid attention to seedling replenishment. Tending is carried out within 3 years before planting, fertilization is carried out once in spring every year, and weeding is paid attention to and disease and insect pest control is well carried out.

TABLE 1 comparison of germination rates of Phoebe Machilus in winter and spring sowing

Post-transplantation treatment mode	Average survival Rate (%)
		Winter sowing (Mobroke episperm)	90.65
Spring sowing (laminated sand storage)	65.24

TABLE 2 survival rate comparison of after-transplanting-out-of-shade and non-shade-out-of-shade of photinia fraseri sprouts

Post-transplantation treatment mode	Average survival Rate (%)
		Without shading	58.35
Shade for shading	97.64

As can be seen from fig. 1-3 and tables 1 and 2, the survival rate of the photinia serrulata sowed in winter is high, the bud seedling must be shaded during transplanting, and the seedling cultivation utilizes natural shading to obtain a qualified forest-making seedling with few lateral branches and short trunk.

Claims (12)

1. A method for sowing, seedling raising and afforestation of Photinia serrulata in winter is characterized by comprising the following steps:

1) seed collection: the maturing time of the phoebe nanseri seeds is 10 middle ten days to 11 last days, the testa is changed from green to purple brown for collection, strong and disease-free seeds of the mother tree for more than 15 years are collected, fresh fruits are collected and put into clear water for soaking for 15-20h, the outer peel of the pulp is removed by rubbing, after the fruits are cleaned, the seeds which float on the water surface and are shrunken and not full are removed, the seeds are fished out, and the house is naturally dried in the shade;

2) accelerating germination and sowing in winter: mixing plant ash with seeds dried in the shade, rubbing off oil on the surfaces of the seeds, then using coarse sand mixed with a small amount of broken stones, lightly tamping and rubbing until the color of seed coats changes from grey brown to grey white, wherein partial irregular abrasion occurs, soaking for 20-30min by using 15% hydrogen peroxide solution, then soaking the seeds for 2 days by using warm water at 35-40 ℃, then sowing, selecting a sand bed which is leeward and exposed to the sun and is flat, paving the sand bed by using river sand with proper thickness, wherein the sand bed has the east-west trend, the width is 1.5-2.0m, the thickness is 15-20cm, after the sand bed is sterilized, watering thoroughly for sowing, uniformly scattering the seeds on the sand bed, covering fine sand with the thickness of 2-3cm, spreading, covering the fine sand bed with the thickness of 1-2cm, keeping the humidity, keeping the temperature in winter lower, building a plastic greenhouse, and keeping the temperature of the sand bed to prevent the low-;

3) transplanting the bud seedlings in spring: bare root transplanting is carried out at the bottom of 2 months to the beginning of 3 months in spring, flat leeward land blocks are selected for land preparation before transplanting, weed and broken stones are removed, base fertilizer is applied by mechanical deep ploughing, 50% carbendazim wettable powder is used for soil disinfection, the growth of the photinia serrulata is easy to be exposed to sunlight, a row of photinia serrulata with the plant spacing of 1.5-2m is planted on two sides of each nursery land before transplanting, natural shading is provided, sunlight is prevented, root breaking treatment is carried out before transplanting, 5-8cm main roots are kept, holes are dug during transplanting, the size is about 10cm multiplied by 10cm, the transplanting row spacing is 10-15cm, the plant spacing is 5-10cm, sufficient water is irrigated after seedling transplanting, a shading net with the light transmittance of 60% -70% is built for shading, and the transplanting survival rate can be remarkably improved;

4) seedling management: watering, watering once every other week before complete survival after transplanting, keeping soil moist, watering according to drought conditions after survival, weeding artificially at proper time, applying a compound fertilizer for 7-8 months of quick growth according to the growth conditions of seedlings, wherein 40-50kg of compound fertilizer is applied per mu, the fertilizer is uniform, the fertilizer is prevented from being directly contacted with the roots and leaves of the seedlings, the photinia fraseri has strong disease resistance and relatively few plant diseases and insect pests, when the insect pests are red spiders, tender stems and terminal buds are damaged, 5% cypermethrin 1500-2000 liquid is sprayed for prevention and treatment, when the plant diseases are bacterial infection leaves, the edges of the leaves are brown, and 75% chlorothalonil 800-fold liquid is sprayed for prevention and treatment;

5) afforestation technology: the method comprises the following steps of selecting valley slope or low-hilly mountain areas for afforestation in an afforestation site, firstly configuring tree species, carrying out mixed hybridization with deciduous tree species including horse chestnut, zelkova and liquidambar formosana for afforestation, configuring more than 3 tree species, finishing the cleaning work of the afforestation site before afforestation, carrying out block soil preparation, wherein the row spacing of afforestation plants is 1m multiplied by 1m or 1m multiplied by 2m, and selecting seedling transplanting with the growth height of 2 years and the obvious trunk of more than 40cm, wherein the Phoebe dorsalis seedlings have cold resistance at the moment, are not easily frozen when encountering cold tide during overwintering, and the planting proportion of mixed hybridization of the three tree species for afforestation is 60%: 20%: 20%, and the planting proportion of the mixed afforestation of the four tree species is 50%: 20%: 20%: 10 percent, the mixed planting proportion of the photinia serrulata is not less than 50 percent, pit holes are dug in advance, the size of each pit hole is 30cm multiplied by 30cm, 15-20g of compound fertilizer is placed at the bottom of each pit hole to serve as base fertilizer, seedlings are planted into the pit holes to be compacted and watered sufficiently, the survival condition of planting is counted after one month, seedling supplement is paid attention, tending is carried out within the first three years after planting, fertilizer is applied once in spring every year, and weeding is paid attention to well for pest control.

2. The method of claim 1, wherein step 1) requires the collected photinia fraseri seeds to have a thousand seed weight of between 302.3 and 305.4 g.

3. The method according to claim 1, wherein the ratio of the phoebe nannieri seeds mixed with the coarse sand crushed stones in the step 2) is 3: 1.

4. the method of claim 1, wherein the seeding rate of the phoebe nana seeds in step 2) is 0.5kg per square meter.

5. The method as claimed in claim 1, wherein a thermometer is placed in the sand bed in the step 2), the plastic greenhouse is untied when the temperature is higher than 30 ℃, ventilation and dehumidification are carried out, and seeds are easy to mildew due to overhigh temperature and overhigh humidity.

6. The method as claimed in claim 1, wherein the sand bed of step 2) is disinfected with 3% aqueous solution of ferrous sulfate in an amount of 8-10L per square meter of aqueous solution of ferrous sulfate.

7. The method according to claim 1, wherein the step 3) of transplanting the sprouts is performed in rainy days.

8. The method as claimed in claim 1, wherein step 3) is carried out by deep ploughing the plot with a base fertilizer, wherein the application amount is 30-40 kg of compound fertilizer per mu and 150-180 kg of organic fertilizer per mu.

9. The method of claim 1, wherein step 3) the sunshade net is maintained for 20-30 days, and the sunshade net is removed after the seedlings are completely alive.

10. The method according to claim 1, characterized in that the soil preparation work of step 5) is completed 1-2 months before afforestation.

11. The method according to claim 1, characterized in that the afforestation time of step 5) is 2-3 months.

12. The method of claim 1, wherein 50% of leaves are cut off during transplanting and afforestation of the photinia serrulata in the step 5), so that water and nutrient consumption is reduced, and the survival rate is improved.

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