Rapid recovery method for degraded phyllostachys praecox forest

Abstract

The invention discloses a rapid restoration method for a degraded phyllostachys praecox forest, and belongs to the technical field of forestry ecological restoration. The method comprises the steps of degradation degree diagnosis and early-stage cleaning, old bamboo cleaning and bamboo forest structure optimization, soil deep ploughing and obstacle layer breaking, base fertilizer precise application, soil dressing improvement and later-stage maintenance and dynamic regulation and control. According to the improvement of the foreign soil, adaptive foreign soil is accurately selected, the laying thickness is determined according to the degeneration degree after pretreatment, laying is conducted in the bamboo rhizome vigorous growth period or the bamboo shoot bud differentiation period, and scientific watering is combined to promote fusion with original soil. Through a system integration technology, rapid soil function restoration, bamboo rhizome growth environment improvement and bamboo forest productivity improvement are achieved, and the method has the advantages of being rapid in restoration, good in effect, sustainable and wide in applicability and is suitable for restoration of phyllostachys praecox forests with different degradation degrees.

Description

Technical Field

[0001] This invention relates to the field of forestry ecological restoration technology, and more specifically to a method for the rapid restoration of degraded bamboo forests. Background Technology

[0002] Lei bamboo is an important economic bamboo species in southern China, widely cultivated due to its early shoot emergence, long shoot emergence period, high yield, and good economic benefits. However, under intensive management practices such as long-term mulching for shoot incubation, excessive application of chemical fertilizers, and the use of untreated livestock manure, Lei bamboo forests are highly susceptible to degradation. This degradation is mainly manifested in: aging bamboo forest structure (old bamboo accounting for over 40%), shallower rhizome distribution (concentrated in the 0-15cm soil layer), and soil compaction (bulk density > 1.4g / cm³). 3 The following are common problems: decreased fertility (organic matter content <1.5%), severe soil acidification (over 50% of areas have pH <4.5), sharp decline in bamboo shoot yield (more than 60% lower than peak production period), and deterioration in bamboo shoot quality (increased crude fiber content and harder texture).

[0003] Existing methods for restoring degraded *Phyllostachys edulis* forests mostly focus on simple fertilization or thinning, which have significant drawbacks: fertilization alone is insufficient to address soil acidification and compaction, and cannot resolve nutrient absorption barriers caused by shallow rhizomes; simple thinning does not optimize the bamboo age structure, resulting in a restoration cycle of 3-5 years and limited ecological function recovery. While a few methods mention soil improvement, these suffer from problems such as indiscriminate selection of soil types, mismatch between application time and *Phyllostachys edulis* growth cycle, lack of scientific basis for soil thickness, and the introduction of pests and diseases without pretreatment, leading to unstable improvement effects and hindering the rapid and sustainable restoration of degraded *Phyllostachys edulis* forests.

[0004] Therefore, there is an urgent need for a comprehensive approach that integrates bamboo forest structure optimization, soil physical improvement, precise nutrient supplementation, and targeted improvement with imported soil. This approach should clarify the key technical parameters for imported soil application and achieve rapid ecological restoration and productivity enhancement of degraded Lei bamboo forests. Summary of the Invention

[0005] In view of this, the present invention provides a rapid restoration method for degraded Lei bamboo forests. By precisely optimizing the bamboo forest structure and directionally improving the soil environment, especially through the scientific application of topsoil, the method can restore the soil function of degraded Lei bamboo forests, improve the bamboo rhizome growth environment and increase productivity within 1-2 growth cycles, taking into account both ecological and economic benefits.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A rapid restoration method for degraded *Phyllostachys edulis* forests includes the following steps:

[0008] (1) Degradation diagnosis and preliminary cleanup: First, the degradation degree of the Lei bamboo forest is diagnosed. The S-shaped sampling method can be used to measure the soil pH, organic matter content, standing bamboo density and bamboo age structure to define the degradation degree as severely degraded forest land, moderately degraded forest land and slightly degraded forest land.

[0009] Among them, soil with pH < 5.0, organic matter content < 1.8%, the proportion of old bamboo (4 years or older) > 35%, and average bamboo shoot yield < 800 kg per mu is considered severely degraded;

[0010] Soil with a pH of 5.0-5.5, an organic matter content of 1.8%-2.2%, a proportion of 25%-35% old bamboo (4 years or older), and an average bamboo shoot yield of 800-1200 kg per mu is defined as moderately degraded.

[0011] The rest are mildly degraded;

[0012] Then, clear away fallen branches, leaves, weeds, stones, and withered bamboo stumps in the forest to prevent the breeding of pests and diseases.

[0013] (2) Clean up old bamboo and adjust the bamboo forest structure: clean up old bamboo in mid-April to mid-May or in autumn (September to October) when the bamboo shoot production period ends. At this time, the physiological activity of Lei bamboo is relatively slow and the damage to the bamboo forest is small. Selectively reduce the felling according to the degree of degradation. In severely degraded forest land, reduce the felling of old bamboo, diseased bamboo, weak bamboo and overly dense bamboo plants that are 4 years old or older. In moderate and mildly degraded forest land, reduce the felling of degraded bamboo plants that are 5 years old or older.

[0014] Retain healthy, robust bamboo aged 1-4 years, ensuring even spacing between bamboo plants. Ultimately, adjust the bamboo forest density to 900-1100 plants per acre. The optimal bamboo age structure is 1-year-old: 2-year-old: 3-year-old: 4-year-old = 3:4:2:1, meaning that 1-2 year-old bamboo accounts for no less than 70%, ensuring the efficiency of photosynthesis and nutrient accumulation in the bamboo forest.

[0015] (3) Deep plowing: 7-10 days after clearing the old bamboo, the forest land is thoroughly plowed. A combination of rotary tillers and manual plowing is used, and the plowing is done in layers, starting with shallow plowing and gradually deepening, avoiding areas with dense bamboo rhizomes.

[0016] The deep tillage depth is 25-35cm, with the deep tillage depth controlled at 30-35cm for severely degraded forest land and 25-30cm for moderately and slightly degraded forest land. After deep tillage, retain the clod soil (particle size 5-10cm) without deliberately breaking it up, in order to increase soil porosity, improve soil aeration and water permeability, and break up the soil compaction layer. For forest land with obvious heavy clay barrier layer, 10-15% river sand by dry weight of soil can be mixed in during deep tillage to improve soil permeability.

[0017] (4) Application of base fertilizer and nutrient regulation: Base fertilizer is applied during deep plowing, and the base fertilizer is precisely proportioned according to the degree of degradation:

[0018] For severely degraded forest land, apply 2.5 tons of well-rotted farmyard manure (livestock manure, compost) + 50 kg of slow-release NPK compound fertilizer (N:P:K=3:1:2) + 80 kg of dolomite powder per acre;

[0019] For moderately degraded forest land, apply 2 tons of well-rotted farmyard manure + 40 kg of slow-release NPK compound fertilizer (N:P:K=3:1:2) + 50 kg of dolomite powder per mu;

[0020] For mildly degraded forest land, apply 1.5 tons of well-rotted farmyard manure + 30 kg of slow-release NPK compound fertilizer (N:P:K=3:1:2) per acre;

[0021] Organic fertilizer and dolomite powder are evenly spread and then mixed into the 0-20cm layer of soil during deep tilling. Slow-release compound fertilizer is applied by trenching, with shallow trenches dug 30cm away from the bamboo plants. After application, the soil is covered to prevent nutrient loss and provide a continuous supply of nutrients for the growth of bamboo rhizomes and seed bamboo, while also regulating the soil pH.

[0022] (5) Soil improvement (i.e. core step): Select suitable soil according to the soil type of degraded forest land. Priority should be given to loose texture, slightly acidic mountain yellow soil, humus, etc. It is required that the soil has not been planted with crops. Among them, mountain yellow soil is suitable for all types of degraded bamboo forests, and humus is preferred for severely acidified degraded forest land.

[0023] The key indicators for topsoil are: pH value 5.5-6.5, organic matter content not less than 2.0%, and bulk density 1.1-1.3 g / cm³. 3 Available nitrogen content ≥80mg / kg, available phosphorus content ≥25mg / kg, available potassium content ≥100mg / kg;

[0024] Topsoil pretreatment: Before application, the topsoil needs to undergo the following pretreatment steps: remove large stones, coarse roots, weed seeds and other debris; then apply 0.1% of the dry weight of the topsoil with 50% carbendazim wettable powder for disinfection to kill pathogens and insect eggs; next, mix in 2-3% of the dry weight of the topsoil with well-rotted cake fertilizer; then mix in arbuscular mycorrhizal fungi agent at a rate of 10 kg per acre; finally, mix thoroughly and pile for 24 hours for later use to enhance the fertility and microbial activity of the topsoil and promote symbiotic growth of bamboo rhizomes;

[0025] Application time: The best time to apply is after the spring bamboo shoot season is completely over (late May to early June). At this time, Lei bamboo enters the vigorous growth period of bamboo rhizomes. After adding topsoil, the bamboo rhizomes can quickly take root and expand. The auxiliary time to apply is during the autumn bamboo shoot differentiation period (September to November). Applying topsoil at this time can promote bamboo shoot differentiation and nutrient accumulation. Avoid applying during the hot and dry season (July to August) or the cold season (December to February).

[0026] Application Thickness and Method: The thickness of the topsoil is determined based on the degree of degradation, i.e.:

[0027] The thickness of the paving should be 8-10cm for severely degraded forest land, 6-8cm for moderately degraded forest land, and 5-6cm for lightly degraded forest land.

[0028] The method of layering is adopted, with each layer covering 1 / 2 of the total thickness. The compaction degree is controlled at 60-70% to ensure that the topsoil is closely combined with the original soil and to avoid the formation of gaps. During the laying process, mechanical spreading combined with manual leveling can be used to ensure uniform thickness and cover the entire bamboo forest area.

[0029] No topsoil should be added within 50 centimeters around the bamboo grove to form a preliminary drainage ditch, which will prevent water accumulation during the rainy season and prevent the bamboo rhizomes from becoming moldy.

[0030] Post-construction maintenance and dynamic control: After the topsoil is laid, drip irrigation should be used for watering. If the weather is dry and the soil moisture content is <15%, watering should be carried out within 24 hours, with a watering volume of 30-40 cubic meters per acre. 3 The process is carried out in two stages, with a four-hour interval between each stage, to promote the integration of the imported soil with the original soil. If it rains, the surrounding drainage ditches should be cleared in time to prevent the imported soil from being lost or compacted.

[0031] Water management: After the topsoil is laid, maintain the soil moisture content at 18-22%. During dry periods, drip irrigate once a week, applying 20m³ per acre each time. 3 Drain water promptly during the rainy season to prevent waterlogging.

[0032] Topdressing management: Apply a topdressing fertilizer for bud differentiation once in the autumn of the same year. The topdressing fertilizer is a combination of nitrogen and potassium fertilizer. Apply 30 kg of urea + 20 kg of potassium chloride per mu. Apply the fertilizer by hole application, that is, make a hole 15 cm away from the bamboo rhizome and cover it with soil after application. Apply a topdressing fertilizer for promoting bamboo shoots once in the spring of the following year before the bamboo shoots emerge. The topdressing fertilizer for promoting bamboo shoots is a combination of well-rotted soybean cake fertilizer and high-nitrogen compound fertilizer. Apply 80 kg of well-rotted soybean cake fertilizer + 25 kg of high-nitrogen compound fertilizer per mu to promote the germination and growth of bamboo shoots.

[0033] Pest and disease control: Biological control is the main method, supplemented by chemical control. 15 days after the topsoil is laid, release 10,000 Trichogramma wasps per acre to control bamboo borers. In summer, spray 100 ml of 0.3% matrine aqueous solution per acre, diluted 500 times, to control bamboo aphids. Diseased bamboo is cleaned up and disposed of in a centralized manner regularly to reduce the source of pest and disease infection.

[0034] Thinning and retaining bamboo shoots: Thinning should be carried out during the spring bamboo shoot emergence period, retaining strong bamboo shoots with a spacing of 20-30cm, and removing weak and deformed bamboo shoots. The number of bamboo shoots retained should be controlled at 300-400 per mu. All bamboo shoots should be dug up during the autumn bamboo shoot emergence period.

[0035] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a method for the rapid restoration of degraded bamboo forests, which has the following beneficial effects:

[0036] This invention clarifies the core indicators, suitable types, and targeted selection schemes of the topsoil, accurately determines the thickness of the topsoil based on the degree of degradation, and rapidly improves the problems of soil acidification, compaction, and low fertility in degraded Lei bamboo forests through scientific pretreatment and laying methods, fundamentally restoring soil function and providing an excellent substrate for Lei bamboo growth.

[0037] This invention organically combines degradation diagnosis, structural optimization, deep tillage to remove obstacles, precision fertilization, soil improvement, and dynamic maintenance to address the key factors of bamboo forest degradation in a multi-pronged approach, enabling rapid restoration of degraded Lei bamboo forests and significantly shortening the restoration cycle.

[0038] The technical solution of this invention achieves differentiated management through degradation degree diagnosis, precise ratio and application method of base fertilizer and topdressing to reduce nutrient loss and environmental pollution; the introduction of microbial agents and decomposed organic fertilizer in the pretreatment of imported soil enhances soil ecological stability; and subsequent dynamic monitoring and adjustment ensure the sustainability of the solution. After implementation, it not only significantly increases bamboo shoot yield and quality but also improves the bamboo forest ecological environment, achieving a synergistic improvement in ecological and economic benefits. Furthermore, this invention clearly defines the specific parameters, operating methods, and equipment requirements for each step. The imported soil selection is based on local resources, and the pretreatment and laying methods are simple and easy to implement, applicable to Lei bamboo forests with different degrees of degradation, especially suitable for the restoration of degraded Lei bamboo forests caused by intensive management in southern regions, and has broad application value. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] This experiment was conducted from April 2023 to April 2025 in a degraded bamboo forest in Lin'an District, Hangzhou City. The experimental site covered an area of ​​15 mu (approximately 1 hectare), which was a severely degraded bamboo forest. The initial soil pH was 4.2, the organic matter content was 1.4%, the bamboo density was 1450 plants / mu (approximately 165 hectares), and the proportion of old bamboo (4 years or older) was 42%. The average yield of bamboo shoots per mu (approximately 0.067 hectares) in 2022 was 680 kg.

[0042] The implementation steps are as follows:

[0043] (1) Preliminary preparation: From April 10 to 15, 2023, the degree of degradation of the experimental site was diagnosed. Ten soil samples were taken by S-shaped sampling method and mixed to determine soil indicators. The residual branches, leaves, weeds, stones and withered bamboo stumps in the forest were cleared.

[0044] (2) Old bamboo clearing: On April 20, 2023, old bamboo, diseased bamboo, weak bamboo and overly dense bamboo plants aged 4 years and above were cut down, and healthy and strong bamboo plants aged 1-4 years were retained. The bamboo density was adjusted to 1,000 plants / mu, and the bamboo age structure was 1 year: 2 years: 3 years: 4 years = 3: 4: 2: 1.

[0045] (3) Deep plowing: On April 28, 2023, manual deep plowing was carried out, using a method of first shallow and then deep, and layered plowing, avoiding areas with dense bamboo rhizomes, with a depth of 32cm, and retaining 5-10cm of clod soil.

[0046] (4) Apply base fertilizer: During deep plowing, spread 2.5 tons of decomposed pig manure + 80 kg of dolomite powder per mu and mix it into the 0-20 cm soil layer during deep plowing; apply 50 kg of slow-release NPK compound fertilizer (N:P:K=3:1:2) per mu, and apply it in shallow trenches 30 cm away from the bamboo plants, and cover it with soil after application;

[0047] (5) Guest soil improvement:

[0048] Soil selection: Select local mountain yellow soil (uncultivated), with the following test indicators: pH 6.0, organic matter content 2.6%, and bulk density 1.2 g / cm³. 3 Available nitrogen 92 mg / kg, available phosphorus 31 mg / kg, available potassium 115 mg / kg;

[0049] Topsoil pretreatment: On May 10, 2023, remove debris; apply 50% carbendazim wettable powder (0.1% of the dry weight of the topsoil) for disinfection; mix in well-rotted cake fertilizer (2.5% of the dry weight of the topsoil); then mix in arbuscular mycorrhizal fungicide (10 kg per acre), mix well and pile for 24 hours.

[0050] Application and Implementation: On May 12, 2023, topsoil was laid using a combination of mechanical spreading and manual leveling. The topsoil was 8cm thick and laid in two layers of 4cm each (half of the total thickness each time). It was lightly compacted (65% compaction). No topsoil was applied within 50cm of the bamboo grove, and the area was shaped into drainage ditches.

[0051] Immediate watering: After the installation is completed, due to the dry weather and soil moisture content of 13% < 15%, drip irrigation will be used on the same day, in two applications, each time 20m² per acre. 3 4 hours apart;

[0052] (6) Post-construction maintenance:

[0053] Water management: From May to June 2023, monitor soil moisture content weekly. During drought, apply drip irrigation once a week, 20m³ per acre each time. 3 Clean drainage ditches promptly during the rainy season;

[0054] Topdressing management: On September 20, 2023, apply 30 kg of urea + 20 kg of potassium chloride per mu (bud differentiation fertilizer); on February 25, 2024, apply 80 kg of decomposed soybean cake fertilizer + 25 kg of high-nitrogen compound fertilizer per mu (bamboo shoot promoting fertilizer).

[0055] Pest and disease control: On May 27, 2023 (15 days after the topsoil was laid), release 10,000 Trichogramma wasps per mu; on July 15, 2023, spray 0.3% matrine aqueous solution (100ml / mu, diluted 500 times); regularly clean up diseased bamboo and bamboo shoots and dispose of them properly.

[0056] Thinning and retaining bamboo shoots: Thin bamboo shoots in March-April 2024 (spring bamboo shoot season), retaining strong bamboo shoots (spaced 20-30cm apart), and removing weak and deformed bamboo shoots, leaving 350 bamboo shoots per mu; remove all bamboo shoots in October-December 2024 (autumn bamboo shoot season).

[0057] After two years of restoration, the experimental site showed significant improvement in all indicators, as detailed in the table below:

[0058] Monitoring indicators Initial value (April 2023) April 2024 (1 year in effect) April 2025 (2-year implementation period) Increase rate (2 years) Soil pH 4.2 5.3 5.8 38.1% Soil organic matter content (%) 1.4 2.2 2.8 100.0% Bamboo density (plants / acre) 1450 1050 1080 -25.5% Percentage of 1-2 year old bamboo (%) 58 72 75 29.3% Average bamboo shoot yield per mu (kg) 680 1250 1820 167.6% Average weight of a single bamboo shoot (g) 185 240 285 54.1% Bamboo rhizome distribution depth (cm) 8-12 15-20 20-25 Significantly deepened

[0059] Comparative Example 1

[0060] A similar degraded bamboo forest of the same type was selected from an adjacent plot (5 mu) of land in Example 1. Traditional restoration methods (thinning and single fertilization) were used. Monitoring data in April 2025 showed that the soil pH was 4.8, the organic matter content was 1.8%, and the average bamboo shoot yield per mu was 1050 kg, all of which were significantly lower than the results of the embodiment of the present invention.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for rapid recovery of degenerated Phyllostachys reticulata forest, characterized in that, Comprise the following sequential steps: (1) Degeneration degree diagnosis and early stage cleaning: measure the soil pH value, organic matter content, bamboo density and bamboo age structure of forest land, define the degeneration degree as severe degeneration forest land, moderate degeneration forest land and mild degeneration forest land, and clean up the branches, leaves, weeds, stones and dead bamboo stumps in the forest land; (2) Cleaning old bamboos and adjusting bamboo forest structure: selectively cutting old bamboos, sick bamboos, weak bamboos and over-dense bamboos in the middle of April to the middle of May or September to October, retaining 1-4 year old healthy bamboos, and adjusting the bamboo density to 900-1100 plants per mu; (3) Deep ploughing of soil: comprehensively deep ploughing the soil within 7-10 days after cleaning old bamboos, the deep ploughing depth is 25-35 cm, and the blocky soil in the depth of 5-10 cm is retained; (4) Applying base fertilizer and nutrient regulation: applying base fertilizer when deep ploughing; (5) Guest soil improvement: selecting mountain yellow soil and humus with pH value of 5.5-6.5 and organic matter content not less than 2.0% as guest soil, after pretreatment, laying on the surface layer of forest land in the late May to early June or September to November, the laying thickness is 8-10 cm for severe degeneration forest land, 6-8 cm for moderate degeneration forest land, and 5-6 cm for mild degeneration forest land; no guest soil is laid within 50 cm range around the bamboo forest, and water is poured according to the soil moisture content after laying; (6) Later stage maintenance and dynamic regulation: maintaining the soil water content at 18-22% after laying guest soil, applying whip bud differentiation fertilizer in autumn of the same year, and applying sprout accelerating fertilizer in spring of the next year; timely performing disease and pest control and bamboo sprout thinning and retention.

2. The method for rapid recovery of degraded Phyllostachys retacea forest according to claim 1, wherein, The degeneration degree defining standard in step (1) is: Soil pH <5.0, organic matter content <1.8%, old bamboos of more than 4 years old account for >35%, and bamboo sprout yield per mu <800 kg for severe degeneration; Soil pH 5.0-5.5, organic matter content 1.8%-2.2%, old bamboos of more than 4 years old account for 25%-35%, and bamboo sprout yield per mu 800-1200 kg for moderate degeneration; The rest is mild degeneration.

3. The method for rapid restoration of degenerated Phyllostachys reticulata forest according to claim 1, wherein, In step (2), 1-2 year old bamboos account for ≥70%, and the bamboo age structure is 1 year old:2 year old:3 year old:4 year old=3:4:2:

1.

4. The method for rapid restoration of degenerated Phyllostachys reticulata forest according to claim 1, wherein, In step (3), the deep ploughing is performed in the way of shallow first and deep later, and layer ploughing, the deep ploughing depth is 30-35 cm for severe degeneration forest land, 25-30 cm for moderate and mild degeneration forest land, and the dense area of bamboo whip is avoided; the blocky soil particle size is 5-10 cm; the soil dry weight 10-15% of river sand is mixed in the deep ploughing of the heavy obstacle layer forest land.

5. The method for rapid restoration of degenerated Phyllostachys reticulata forest according to claim 1, wherein, In step (4), the base fertilizer is specifically: Severe degeneration forest land: 2.5 tons of rotten farm manure, 50 kg of nitrogen, phosphorus and potassium slow-release compound fertilizer with N:P:K=3:1:2, and 80 kg of dolomite powder per mu; Moderate degeneration forest land: 2 tons of rotten farm manure, 40 kg of nitrogen, phosphorus and potassium slow-release compound fertilizer with N:P:K=3:1:2, and 50 kg of dolomite powder per mu; Mild degeneration forest land: 1.5 tons of rotten farm manure, 30 kg of nitrogen, phosphorus and potassium slow-release compound fertilizer with N:P:K=3:1:2; Among them, the organic fertilizer and dolomite powder are uniformly spread and mixed into the soil layer of 0-20 cm after deep ploughing, the slow-release compound fertilizer is ditched 30 cm away from the bamboo, and the soil is covered after application.

6. The method for rapid recovery of degraded Phyllostachys violascens forest according to claim 1, wherein, The pre-treatment of the guest soil in step (5) includes: removing impurities by sieving, applying 0.1% of 50% wettable powder of carbendazim by dry weight of the guest soil, mixing in 2-3% of the rotten cake fertilizer by dry weight of the guest soil, then mixing in the arbuscular mycorrhizal fungus agent, and mixing in 10 kg per mu. After mixing, the mixture is piled up for 24 hours.

7. The method according to claim 1, wherein the Phyllostachys retaceus forest is degraded by over-harvesting of bamboo shoots. The guest soil is laid in layers in step (5), with 1 / 2 of the total thickness of each layer, and each layer is slightly compacted after being laid, with a compaction degree of 60-70%.

8. The method for rapid recovery of degraded Phyllostachys retaceens forest according to claim 1, wherein, The watering in step (5) is by drip irrigation. If the weather is dry and the soil moisture content is less than 15%, watering is performed within 24 hours, with a watering amount of 30-40 m 3 per mu, in two times with an interval of 4 hours. If it rains, the surrounding drainage ditches are cleaned in time.

9. The method for rapid restoration of degenerative Phyllostachys retaceus forest according to claim 1, wherein, The whip bud differentiation fertilizer in step (6) is a combination of nitrogen and potassium fertilizer, with 30 kg of urea and 20 kg of potassium chloride per mu; the sprout accelerating fertilizer is a combination of rotten bean cake fertilizer and high-nitrogen compound fertilizer, with 80 kg of rotten bean cake fertilizer and 25 kg of high-nitrogen compound fertilizer per mu.

10. The method for rapid restoration of degenerative Phyllostachys retaceus forest according to claim 1, wherein, The pest control in step (6) mainly uses biological control and supplemented by chemical control, with the release of 10,000 trichogramma per mu 15 days after the laying of the guest soil; the spraying of 0.3% matrine water agent, 100 ml per mu, diluted 500 times; and the regular cleaning of the sick bamboo for centralized treatment. Sparrow bush leave and raise: during the spring sprouting period, the bamboo shoots are thinned out, with the healthy ones being kept at a distance of 20-30 cm, and the weak and small ones and the deformed ones being removed, with the amount of the kept bamboo shoots being controlled at 300-400 per mu; all the bamboo shoots are dug out during the autumn sprouting period.