Efficient afforestation method for precious tree species phoebe zhennan

Abstract

The invention discloses an efficient afforestation method for precious tree species Machilus zhennan, and relates to the technical field of Machilus zhennan afforestation. The method comprises the following steps: (1) selecting a proper afforestation land parcel, and applying decomposed farmyard manure after land preparation; (2) digging holes for afforestation, wherein the planting density is 120-150 plants per mu; 3, container seedlings are adopted for planting, and transplanting is conducted after pruning and before germination; (4) carrying out tending twice every year in the first three years, and spraying a protective agent in a high-temperature season every year in the first five years; (5) topdressing in the first three years and forest tending are carried out at the same time, topdressing is carried out once in 1-2 years from the fourth year, and pest and disease damage is prevented and controlled by a chemical method during the period. The problem that seedlings in the early stage of afforestation of phoebe zhennan are sensitive to light and easily affected by ultraviolet rays to cause slow growth is solved.

Description

Technical Field

[0001] The invention relates to the technical field of Macaoia zhennan afforestation, and in particular to an efficient afforestation method for Macaoia zhennan, a precious tree species. Background Art

[0002] Phoebe zhennan, a kind of precious tree, is a national second-level protected plant, an evergreen broad-leaved tree species, and has a beautiful tree shape. Due to the improvement of people's living standards, the demand for precious wood is increasing. At present, there is a large gap in the resources of precious tree species Phoebe in my country. Therefore, vigorously developing Phoebe zhennan plantations is an important way to meet the demand for precious materials of Phoebe zhennan. However, Phoebe zhennan has high requirements for natural conditions such as soil, humidity, light, and temperature. The Phoebe zhennan planted at present grows relatively slowly. In addition, the survival rate of Phoebe zhennan planted in the early stage is suppressed due to the influence of high temperature weather. At present, the common Phoebe zhennan plantation method is mostly to use I and II grade high-quality container seedlings for afforestation, and then carry out fine tending and management. Since the early stage of Phoebe zhennan management and maintenance requirements are high and a large amount of manpower and financial resources are required, the cultivation cost of Phoebe zhennan plantation is high, which affects the rapid development of Phoebe zhennan plantation.

[0003] Since Phoebe zhennan grows slowly in its infancy and has a long period of maturity, its seedling growth regulation has always been an important content. Soil, humidity, light, and temperature are all factors that affect the survival of Phoebe zhennan, and shading and fertilization are the most common regulatory factors in artificial management. Phoebe zhennan likes heat but is not resistant to light, so Phoebe zhennan can be planted and cultivated in Chongqing, but due to the strong light in summer, Phoebe zhennan seedlings grow slowly, so they need to be shaded during the artificial afforestation process of Phoebe zhennan. The current common shading method uses shade cloth for shading, but the operation cost is large and it is difficult to implement in mountainous areas. Therefore, finding a afforestation method that can ensure sufficient light during the afforestation process of Phoebe zhennan and avoid excessive ultraviolet radiation of Phoebe zhennan causing leaf fading or withering is the key to promoting the survival of Phoebe zhennan artificial forests. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a high-efficiency afforestation method for the precious tree species Phoebe zhennan, so as to solve the problem that the seedlings of Phoebe zhennan in the early stage of afforestation are sensitive to light and easily affected by ultraviolet rays, resulting in slow growth.

[0005] The present invention solves the above technical problems by the following technical means:

[0006] A method for efficiently afforestation of the precious tree species Phoebe zhennan, the method being as follows:

[0007] (1) Select suitable afforestation plots and apply decomposed farmyard manure after land preparation;

[0008] (2) Digging holes for afforestation, with a planting density of 120-150 plants per mu;

[0009] (3) Use container seedlings for planting and transplant them after pruning before budding;

[0010] (4) Tending should be carried out twice a year in the first three years, and protective agents should be sprayed every year during the high temperature season in the first five years;

[0011] (5) In the first three years, top dressing is carried out simultaneously with forest tending. Starting from the fourth year, top dressing is carried out once every 1-2 years. During this period, chemical methods are used to control pests and diseases.

[0012] In the process of afforestation of Phoebe zhennan, the middle and lower parts of the hillside with deep effective soil layer and good drainage are usually selected for afforestation, and the soil pH should be slightly acidic.

[0013] Furthermore, the farmyard manure applied during land preparation is 500-800 kg / mu; compound fertilizer is applied in the hole before planting, with an amount of 50-100 g / hole; during topdressing, digging trenches around the trunks of the Phoebe zhennan trees and applying compound fertilizer, with an amount of 200-300 g / plant. After applying the compound fertilizer, a layer of topsoil can be covered to prevent nutrient volatilization.

[0014] Furthermore, the container seedlings with a seedling height of more than 60 cm and a ground diameter of more than 0.4 cm are selected for planting. High-quality seedlings should be selected for afforestation, and the afforestation needs to be planted deeply and tightly.

[0015] Furthermore, the tending in the first three years is carried out in March-April and July-August respectively, and topdressing is carried out together with forest tending. The specific operation of spraying protective agents in the high temperature season every year in the first five years is:

[0016] When the temperature is ≥30℃ and there are ≥3 consecutive sunny days, spray the protective agent on the branches and leaves of the camphor tree seedlings. The spraying frequency is 3-7 days / time.

[0017] Usually, after afforestation, Phoebe zhennan needs to be tended for three years, and the seedlings are soiled and straightened, and the weeding and loosening of the soil around the seedlings are carried out. In addition, since the Phoebe zhennan seedlings are sensitive to ultraviolet light, summer shading is required, but due to the large afforestation area, high cost, and slope land, it is difficult to use the shade cloth method to shade. Therefore, the present invention is selected to spray the protective agent on sunny days in summer to prevent the Phoebe zhennan seedlings from being damaged by ultraviolet radiation, causing the seedlings to grow slowly or die. However, the protective agent of the present invention needs to be sprayed continuously for at least five years, and the spraying can be stopped when the Phoebe zhennan seedlings can respond to the summer climate autonomously.

[0018] Furthermore, the specific operation of pruning is: removing 60-70% of the leaves of the seedlings, as well as the side branches below 25 cm from the ground and the excessively long main roots.

[0019] Furthermore, the protective agent includes the following raw materials:

[0020] Sodium lignin sulfonate, glycerin, propolis, silver nitrate, rutin, gum arabic, vitamin C, sodium alginate, soy lecithin, cholesterol.

[0021] The protective agent of the invention is mainly sprayed on the leaves of Phoebe zhennan seedlings to reflect most of the light, reduce the influence of the light intensity on the seedlings, and thus increase the probability of the seedlings becoming a forest.

[0022] Further, the preparation method of the protective agent is as follows:

[0023] (1) Adding gum arabic and vitamin C to silver nitrate solution, stirring and reacting at 40-50° C. for 30-60 min, then adding propolis and sodium alginate, and continuing stirring for 20-24 h to obtain a glue solution;

[0024] (2) dissolving soybean lecithin and cholesterol in anhydrous ethanol to obtain a mixed solution, heating it at 65-75° C. for 20 minutes, then adding sodium lignin sulfonate, and continuing the reaction for 10 minutes to obtain a sodium lignin sulfonate suspension;

[0025] (3) After the glue solution is mixed with glycerol and rutin and stirred for 1-2 hours, a sodium lignin sulfonate suspension and water are added, and the mixture is heated to 60° C. and stirred for 2-3 hours to obtain a protective agent.

[0026] Since the protective agent prepared by the present invention is used in high temperature weather in summer, it is necessary to have certain high temperature resistance and photolysis resistance. The present invention uses silver as a light shielding agent to shield ultraviolet rays, but the cost of silver is relatively high, so the present invention also adds sodium lignin sulfonate to cooperate with silver to resist ultraviolet rays on the leaves. However, since the protective agent acts on living plants, the plants themselves will produce life activities, so while resisting ultraviolet rays, it is necessary to prevent the protective agent from toxicating the plants. If more silver accumulates on the surface of the leaves, it will have a toxic effect on the seedlings of Phoebe zhennan. Therefore, the present invention uses propolis and sodium alginate to mix and prepare a glue to seal the silver, and a certain amount of rutin is added to increase the resistance of the plant. In addition, since propolis also has certain thermoplasticity, the viscosity increases in high temperature weather, and the adhesion performance is better, so the protective agent of the present invention can not only avoid the toxic effect of silver on the plants, but also can act on the leaves for a long time due to its film-forming performance, thereby improving the high temperature resistance. In addition, sodium lignin sulfonate has poor dispersibility and its stability and high temperature resistance decrease after long-term ultraviolet irradiation, which leads to reduced protective effect. Therefore, in order to use soybean lecithin and cholesterol to react with sodium lignin sulfonate, the prepared suspension is mixed with glue, so that sodium lignin sulfonate and nanosilver adhere to each other through the medium to increase the stability of the suspension. Finally, the glue, suspension, glycerol and rutin are mixed to react to obtain a highly stable protective agent to promote the growth and development of Phoebe zhennan.

[0027] Furthermore, the mass ratio of the soybean lecithin, cholesterol and sodium lignin sulfonate is 1:(0.3-0.4):

[0028] (0.2-0.3).

[0029] Furthermore, the mass ratio of the silver nitrate, gum arabic, vitamin C, propolis and sodium alginate is 1:

[0030] (5-6):10:2:4.

[0031] Furthermore, the mass ratio of the glycerol, rutin, glue solution and sodium lignin sulfonate suspension is 0.5:0.1:1:1.

[0032] Beneficial effects:

[0033] The zhennan afforestation method disclosed in the present invention is suitable for zhennan afforestation in areas with strong light, and solves the problem that zhennan afforestation seedlings are susceptible to ultraviolet rays and thus grow slowly through the combination of the planting process, the nurturing process and the protection process. At the same time, the protective agent prepared by the present invention can solve the light sensitivity of the seedlings, simplify the shading operation in the planting process, and reasonably adjust the influence of light on zhennan afforestation seedlings, which is helpful to expand the application of the zhennan afforestation method in areas with strong light and strong ultraviolet radiation. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to specific embodiments:

[0035] Example 1: Preparation of protective agent

[0036] (1) 10 g of silver nitrate is prepared into a 0.1 mol / L silver nitrate solution, 50 g of gum arabic is dissolved in 100 g of hot water to obtain a gum arabic solution, 100 g of vitamin C is prepared into a 2 mol / L vitamin C solution, all are mixed and stirred at 40° C. for 30 min, then 20 g of molten propolis and 40 g of sodium alginate are added, and stirring is continued at 40° C. for 24 h to obtain a glue solution;

[0037] (2) 100 g of soybean lecithin and 30 g of cholesterol were mixed and dissolved in 1000 ml of anhydrous ethanol to obtain a mixed solution, and after heat-reacting at 65° C. for 20 min, 20 g of sodium lignin sulfonate and 100 ml of water were added to prepare a sodium lignin sulfonate solution, and the reaction was continued for 10 min to obtain a sodium lignin sulfonate suspension;

[0038] (3) 100 g of the glue solution was mixed with 50 g of glycerol and 10 g of rutin and stirred for 1 h, then 100 g of sodium lignin sulfonate suspension and 300 ml of water were added, the mixture was evenly mixed, heated to 60° C., and stirred for 3 h to obtain a protective agent.

[0039] Example 2: Preparation of protective agent II

[0040] (1) 10 g of silver nitrate is prepared into a 0.1 mol / L silver nitrate solution, 60 g of gum arabic is dissolved in 110 g of hot water to obtain a gum arabic solution, 100 g of vitamin C is prepared into a 2 mol / L vitamin C solution, all are mixed and stirred at 45° C. for 60 min, then 20 g of molten propolis and 40 g of sodium alginate are added, and stirring is continued at 45° C. for 20 h to obtain a glue solution;

[0041] (2) 100 g of soybean lecithin and 40 g of cholesterol were mixed and dissolved in 1000 ml of anhydrous ethanol to obtain a mixed solution, and after the mixture was kept warm for reaction at 75° C. for 20 min, 30 g of sodium lignin sulfonate and 100 ml of water were added to prepare a sodium lignin sulfonate solution, and the reaction was continued for 10 min to obtain a sodium lignin sulfonate suspension;

[0042] (3) 100 g of the glue solution was mixed with 50 g of glycerol and 10 g of rutin and stirred for 1 h, then 100 g of sodium lignin sulfonate suspension and 300 ml of water were added, the mixture was evenly mixed, heated to 60° C., and stirred for 3 h to obtain a protective agent.

[0043] Example 3: Planting of Phoebe zhennan

[0044] (1) Select suitable afforestation plots, preferably the middle and lower part of the hillside, with a deep effective soil layer and good drainage. The soil pH should be between 5.8 and 6.5. After land preparation, apply 500-800 kg / mu of decomposed farmyard manure according to soil fertility;

[0045] (2) Dig holes for afforestation. The size of the holes should be 50×50×50 cm, and the planting density should be 120-150 plants / mu.

[0046] (3) Select high-quality container seedlings with a height of more than 60 cm and a ground diameter of more than 0.4 cm. Prune the seedlings by removing 60-70% of the leaves, side branches below 25 cm from the ground, and taproots that are too long. Transplanting should be done before budding in spring. Planting needs to be deep and compact. Apply compound fertilizer (RBF) in the hole before planting, with a dosage of 50-100 g / hole;

[0047] (4) In the first three years, the seedlings were tended twice, in March-April and July-August, to cultivate the soil and straighten the seedlings, and weed and loosen the soil around the seedlings. In the first five years, protective agents were sprayed in the high temperature season. Specifically, when the temperature was ≥30℃ and there were ≥3 consecutive sunny days, the protective agents were evenly sprayed on the branches and leaves of the Phoebe zhennan seedlings, and the spraying frequency was 3-7 days / time;

[0048] (5) In the first three years, topdressing is carried out simultaneously with forest tending. Starting from the fourth year, topdressing is carried out once every 1-2 years. When topdressing, compound fertilizer (RBF) is used. Fertilizer is applied by digging trenches around the trunks of the Phoebe trees. The amount is 200-300g / tree. During this period, chemical methods are mainly used to control pests and diseases, especially paying attention to the control of pests and diseases such as weevils and golden flower beetles.

[0049] Comparative Example 1:

[0050] This comparative example is compared with Example 1, and the difference lies mainly in the different steps of preparing the glue solution, which are as follows:

[0051] 10 g of silver nitrate was prepared into a 0.1 mol / L silver nitrate solution, 50 g of gum arabic was dissolved in 100 g of hot water to obtain a gum arabic solution, 100 g of vitamin C was prepared into a 2 mol / L vitamin C solution, all were mixed, stirred and reacted at 40° C. for 60 min, filtered, and then water was added to obtain a silver dispersion. The subsequent preparation process was referred to Example 1 to obtain a protective agent.

[0052] Comparative Example 2:

[0053] This comparative example is compared with Example 1, and the difference lies mainly in the different steps of preparing the glue solution, which are as follows:

[0054] (1) 10 g of silver nitrate is prepared into a 0.1 mol / L silver nitrate solution, 50 g of gum arabic is dissolved in 100 g of hot water to obtain a gum arabic solution, 100 g of vitamin C is prepared into a 2 mol / L vitamin C solution, all are mixed and stirred at 40° C. for 30 min, then 40 g of sodium alginate is added, and stirring is continued at 40° C. for 24 h to obtain a glue solution; the subsequent preparation process is referred to Example 1 to obtain a protective agent.

[0055] Comparative Example 3:

[0056] This comparative example is in contrast to Example 1, and the difference lies mainly in the preparation steps of the sodium lignin sulfonate suspension, which are as follows:

[0057] 20g of sodium lignin sulfonate and 100ml of water were mixed to prepare a sodium lignin sulfonate solution, and then 1g of polyvinyl pyrrolidone was added as a dispersant. After stirring and dispersing for 10 minutes, a sodium lignin sulfonate solution was obtained;

[0058] The rest of the preparation process is similar to that of Example 1 to obtain a protective agent.

[0059] Comparative Example 4:

[0060] This comparative example is in contrast to Example 1, and the difference lies mainly in step (3), which is specifically as follows:

[0061] 100 g of the glue, 100 g of the sodium lignin sulfonate suspension and 300 ml of water were mixed evenly, heated to 60° C. and stirred for 3 h to obtain the protective agent.

[0062] Comparative Example 5:

[0063] This comparative example is in contrast to Example 1. The main difference is that nano silver and sodium lignin sulfonate are directly mixed when preparing the protective agent. The specific preparation method is as follows:

[0064] 0.1 g of nanosilver (about 100 nanometers), 20 g of sodium lignin sulfonate and 100 ml of water were mixed to prepare a sodium lignin sulfonate solution, and then 1 g of polyvinyl pyrrolidone was added. After ultrasonic dispersion at 250 W for 10 min, 50 g of sodium alginate and 800 ml of water were added, and the protective agent was obtained after stirring evenly.

[0065] Comparative Example 6:

[0066] This comparative example is in contrast to Example 1, and the difference lies mainly in step (3), which is as follows:

[0067] 100 g of the glue solution and 10 g of rutin were mixed and stirred for 1 h, and then 100 g of the sodium lignin sulfonate suspension and 300 ml of water were added. After mixing evenly, the mixture was heated to 60° C. and stirred for 3 h to obtain a protective agent.

[0068] Comparative Example 7:

[0069] This comparative example is compared with Example 1, and the main difference is that in step (3), the mass ratio of glycerol, rutin, glue solution and sodium lignin sulfonate suspension is 0.5:0.1:0.5:1, and the specific masses are 50g, 10g, 50g and 100g respectively.

[0070] Comparative Example 8:

[0071] This comparative example is compared with Example 1, and the main difference is that in step (3), the mass ratio of glycerol, rutin, glue solution and sodium lignin sulfonate suspension is 0.5:0.1:1:0.5, and the specific masses are 50g, 10g, 100g and 50g respectively.

[0072] The protective agents prepared in Example 1 and Comparative Examples 1-8 were used to treat Phoebe zhennan seedlings. The specific experimental design is as follows:

[0073] The experiment was conducted in Qijiang, Chongqing in 2020. The experimental site is 410m above sea level, with an east-west slope. The soil type is yellow soil, slightly acidic. It belongs to a low mountain and hilly area. After land preparation, 600kg / mu of decomposed farmyard manure was applied. The transplanting time was March 1. Specifically, Phoebe zhennan container seedlings with a seedling height of 60cm (±0.5cm) and a ground diameter of 0.4cm (±0.05cm) were selected for the experiment. Before transplanting, about 65% of the leaves of the seedlings, as well as the side branches and excessively long main roots below 25cm from the ground were removed.

[0074] The planting density is 130 plants / mu, and 50×50×50 cm planting holes are dug. Before planting, 100 g of compound fertilizer (RBF) is applied in the hole. In the first three years, the seedlings are nurtured in April and August each year. During the nurturing period, conventional nurturing methods such as soil cultivation, straightening, weeding, loosening the soil, and insect removal are used. During the nurturing period, compound fertilizer (RBF) is applied at a dosage of 200 g / plant. In addition, in summer every year, when the temperature is ≥30℃ and there are ≥3 consecutive sunny days, the protective agent can be evenly sprayed on the branches and leaves of the Phoebe zhennan seedlings. The spraying frequency is 5 days / time;

[0075] The experimental group 1, the comparative groups 1 to 8, and the blank group were designed, with 10 treatments, 10 plants in each treatment, and 3 repetitions. The experimental group 1 used the protective agent prepared in Example 1, the comparative groups 1 to 8 used the protective agents prepared in Comparative Examples 1 to 8, respectively, and the blank group used shading for sun protection in summer every year, with a shading rate of 45%.

[0076] The seedlings were transplanted, and the plant height (cm) and ground diameter (cm) were measured in April every year (2021.4, 2022.4, and 2023.4), for a total of 3 years. The dead trees were counted, and the data obtained are shown in Table 1:

[0077] Table 1

[0078]

[0079] Data Analysis:

[0080] According to the results in Table 1, the plant height, ground diameter and cumulative mortality of Phoebe chinensis were tested for three consecutive years. Compared with the blank control, the seedlings died in the first year after the protective agent prepared in Example 1 was applied, and there was no death of Phoebe chinensis seedlings after the second year, and the plant height and ground diameter of Phoebe chinensis increased significantly, indicating that the applied protective agent can make Phoebe chinensis grow normally in summer, and is better than the traditional shading group, promoting the increase of plant height and ground diameter. Comparative Examples 1-8 are all adjustments to the proportion of protective agents, among which the plant height of Comparative Group 1 is the lowest and the ground diameter is the smallest. This is because propolis and sodium alginate are not added to the glue solution to synergistically seal silver to reduce toxic effects, and at the same time, the protective agent can prolong the action time of the leaves. The cumulative mortality of Phoebe chinensis seedlings in Comparative Group 5 is the highest. This is because there is no auxiliary synergistic effect of other raw materials after the nano-silver is directly mixed with sodium lignin sulfonate, resulting in excessive toxicity, which in turn causes the death of the seedlings. The mass ratio of glycerol, rutin to glue and sodium lignin sulfonate suspension in the protective agent also significantly affected the growth of Phoebe zhennan seedlings. When the amount of sodium lignin sulfonate suspension added was reduced or the amount of glue added was reduced, the efficiency of sodium lignin sulfonate and silver in synergistically resisting strong light decreased, which in turn caused the Phoebe zhennan to grow slowly. Soybean lecithin, cholesterol, glycerol, rutin and other substances also synergistically improved the efficiency and stability of the protective agent and promoted the growth and development of the plant.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A method for efficiently afforestation of the precious tree species Phoebe zhennan, characterized in that: The method is as follows: (1) Select suitable afforestation plots and apply decomposed farmyard manure after land preparation; (2) Digging holes for afforestation, with a planting density of 120-150 plants per mu; (3) Use container seedlings for planting and transplant them after pruning before budding; (4) Tending should be carried out twice a year in the first three years, and protective agents should be sprayed every year during the high temperature season in the first five years; (5) In the first three years, top dressing is carried out simultaneously with forest tending. Starting from the fourth year, top dressing is carried out once every 1-2 years. During this period, chemical methods are used to control pests and diseases.

2. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 1, characterized in that: The farmyard manure applied during land preparation is 500-800kg / mu; compound fertilizer is applied in the hole before planting, with an amount of 50-100g / hole; during topdressing, trenches are dug around the trunks of the Phoebe zhennan trees and compound fertilizer is applied, with an amount of 200-300g / plant.

3. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 1, characterized in that: During the planting, container seedlings with a seedling height of more than 60 cm and a ground diameter of more than 0.4 cm are selected.

4. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 1, characterized in that: The first three years of tending are carried out in March-April and July-August respectively, and topdressing and forest tending are carried out simultaneously. The specific operation of spraying protective agents in the high temperature season every year in the first five years is as follows: When the temperature is ≥30℃ and there are ≥3 consecutive sunny days, spray the protective agent on the branches and leaves of the camphor tree seedlings. The spraying frequency is 3-7 days / time.

5. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 1, characterized in that: The specific operation of pruning is: removing 60-70% of the leaves of the seedlings, the side branches below 25 cm from the ground and the overlong main roots.

6. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 5, characterized in that: The protective agent includes the following raw materials: Sodium lignin sulfonate, glycerin, propolis, silver nitrate, rutin, gum arabic, vitamin C, sodium alginate, soy lecithin, cholesterol.

7. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 5, characterized in that: The preparation method of the protective agent is as follows: (1) Adding gum arabic and vitamin C to silver nitrate solution, stirring and reacting at 40-50° C. for 30-60 min, then adding propolis and sodium alginate, and continuing stirring for 20-24 h to obtain a glue solution; (2) dissolving soybean lecithin and cholesterol in anhydrous ethanol to obtain a mixed solution, heating it at 65-75° C. for 20 minutes, then adding sodium lignin sulfonate, and continuing the reaction for 10 minutes to obtain a sodium lignin sulfonate suspension; (3) After the glue solution is mixed with glycerol and rutin and stirred for 1-2 hours, a sodium lignin sulfonate suspension and water are added, and the mixture is heated to 60° C. and stirred for 2-3 hours to obtain a protective agent.

8. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 5, characterized in that: The mass ratio of the soybean lecithin, cholesterol and sodium lignin sulfonate is 1:(0.3-0.4):(0.2-0.3).

9. The method for efficiently afforestation of a precious tree species Phoebe zhennan according to claim 5, characterized in that: The mass ratio of the silver nitrate, gum arabic, vitamin C, propolis and sodium alginate is 1:(5-6):10:2:

4.

10. The method for efficiently afforestation of the precious tree species Phoebe zhennan according to claim 5, characterized in that: The mass ratio of the glycerol, rutin, glue solution and sodium lignin sulfonate suspension is 0.5:0.1:1:1.

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