Gobi gravel curtain layer nature-imitating reconstruction repairing method based on modified plant fiber skinning agent

Abstract

The invention provides a Gobi gravel curtain layer nature-imitating reconstruction repairing method based on a modified plant fiber skinning agent. The Gobi gravel curtain layer nature-imitating reconstruction repairing method based on the modified plant fiber crust agent comprises the following steps that S1, earth surface base surface treatment is conducted; s2, material spraying; s3, forming a film and curing; and S4, quality detection and maintenance. According to the Gobi gravel curtain layer nature-imitating reconstruction repairing method based on the modified plant fiber crust agent, a composite network system is constructed by adopting the modified plant fiber and the natural polysaccharide, and a natural-imitating crust layer similar to a natural gravel curtain layer in structure and function is formed by combining the synergistic effect of the degradable cross-linking agent and the inorganic auxiliary agent; the advantages of rapid stabilization, water permeation, moisture preservation and ecological reconstruction of the gobi surface are realized.

Description

Technical Field

[0001] This invention relates to the field of ecological restoration technology, and in particular to a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents. Background Technology

[0002] The Gobi gravel layer is an important component of the surface structure in arid regions, consisting of coarse gravel covering fine soil, and plays an ecological role in preventing wind erosion, inhibiting evaporation, retaining moisture, and maintaining surface thermal balance. For a long time, common restoration methods for Gobi surface degradation and wind erosion have included mechanical gravel covering, biological crusting, and chemical crusting. Mechanical gravel covering restores the surface structure by repaving a gravel layer, but this method is labor-intensive, has limited material sources, and is costly. Biological crusting promotes natural crust formation by inoculating algae, fungi, or microorganisms; while eco-friendly, it has a long crusting cycle and is susceptible to climate limitations. Chemical crusting relies on polymers such as polyacrylamide, polyurethane, or acrylates to solidify the surface; although it can form a crust layer in a short period, it has problems such as ecotoxicity, non-degradability, and secondary pollution. Existing restoration technologies have significant shortcomings in terms of ecological compatibility, construction efficiency, and long-term stability.

[0003] The aforementioned existing technologies mostly achieve surface stabilization through mechanical or chemical means, which do not adequately consider the restoration mechanisms of natural ecosystems, often resulting in an unnatural structure of "artificial cover - ecological isolation." While these methods can temporarily suppress wind erosion, they disrupt surface aeration and water exchange processes, hinder microbial activity and natural vegetation regeneration, leading to a disconnect between the restoration layer and the original ecosystem, resulting in poor ecological adaptability and weak sustainability.

[0004] Therefore, it is necessary to provide a new method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a natural reconstruction and repair method for Gobi gravel curtain layer based on modified plant fiber crusting agent. This method is simple to construct, has strong material adaptability, and can effectively improve the structural stability and wind erosion resistance of the gravel curtain layer.

[0006] To address the aforementioned technical problems, the present invention provides a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents, comprising the following steps: S1: Surface preparation: Cleaning and leveling the Gobi surface to be restored; S2: Material spraying: A two-stage spraying process is used to spray the modified plant fiber crusting agent slurry onto the treated surface; the two-stage spraying process includes an initial spraying stage and a supplementary spraying stage. In the initial spraying stage, 40% to 50% of the total amount of slurry is sprayed to form a preliminary curing film. After the preliminary curing film has solidified for 4 to 6 hours, the supplementary spraying stage is carried out, in which the remaining slurry is sprayed into the pores of the preliminary curing film for cross-linking and solidification. S3: Film Formation and Curing: Allow the sprayed slurry to cure under natural or assisted conditions for 24-72 hours to form a simulated natural skin layer with a thickness of 2-5 mm; S4: Quality Inspection and Maintenance: Conduct performance testing on the cured skin layer and repair any substandard areas by spraying. The modified plant fiber skinning agent is made by mixing, dispersing and cross-linking the following components in mass percentage: 3%~8% modified plant fiber, 0.5%~2% natural polysaccharide, 0.2%~1.5% biodegradable cross-linking agent, 1%~5% reinforcing inorganic additive, and the balance being deionized water.

[0007] Preferably, before step S2, the method further includes determining the concentration of the crusting agent slurry: adaptively determining the concentration of the crusting agent slurry based on the gravel coverage of the surface to be restored; When the gravel coverage is <40%, use a slurry with a concentration of 20 wt.%. When the gravel coverage is 40%~50%, use a slurry with a concentration of 15wt.%.

[0008] Preferably, the method for preparing the modified plant fiber includes: a. Select natural plant fiber raw materials, wash and dry them, and then crush them to an average particle size of 50~200μm; b. The fibers are alkaline activated at 60-70°C for 1.0-1.5 hours using a 1-3 wt% sodium hydroxide solution, and then washed until neutral. c. Place the activated fibers in a modification solution containing 1-3 wt% citric acid or 2-5 wt% polylactic acid, and carry out a cross-linking reaction at 70-80°C for 1.5-2.5 hours. d. After the reaction is completed, the modified plant fiber powder with a moisture content of less than 5% is obtained by drying.

[0009] Preferably, the natural polysaccharide is selected from at least one of xanthan gum, guar gum, sodium alginate, and starch derivatives; the biodegradable crosslinking agent is selected from at least one of citric acid, polylactic acid, and polyglycolic acid; and the reinforcing inorganic additive is selected from at least one of silicate, attapulgite, bentonite, and alumina powder.

[0010] Preferably, in step S2, the spraying construction parameters are: spraying pressure 0.3~0.5MPa, spray volume per unit area 1.0~1.5L / m², ambient temperature 10~35℃, relative humidity 40%~80%, and wind speed not exceeding 6m / s.

[0011] Preferably, the surface hardness of the simulated natural skin layer formed in S3 is ≥3.5 kg / cm², the compressive strength is ≥0.8 MPa, and the permeability coefficient is 1×10⁻³ ~ 1×10⁻ 4 The wind erosion rate is ≤0.1kg / m²·h at a wind speed of 20m / s.

[0012] Preferably, in step S4, the quality inspection includes testing the surface hardness and apparent integrity of the crust layer within 7 days after construction, testing the compressive strength and permeability within 28 days, and evaluating the wind erosion resistance and natural vegetation recovery rate within 6 months to 1 year.

[0013] Compared with related technologies, the natural reconstruction and repair method for Gobi gravel curtain layers based on modified plant fiber crusting agents provided by this invention has the following beneficial effects: This invention provides a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents. By simulating the formation mechanism of natural gravel curtain layers, a porous composite structure is constructed using plant fibers and natural polysaccharides. This results in a crust layer that closely resembles natural surface crust in both morphology and function. This structure is compatible with the original soil, maintains the continuity of the surface ecosystem, and promotes the natural recovery of microorganisms and vegetation, thereby achieving organic integration with the natural environment. Through the composite cross-linking of organic and inorganic materials, a continuous and stable three-dimensional network structure is formed in the crust layer. This structure can remain intact under long-term wind erosion, temperature fluctuations, and wet-dry cycles, without cracking, peeling, or pulverization, ensuring the long-term stability of the restoration layer. It possesses excellent wind erosion resistance; the formed natural-looking crust layer has a reasonable porous structure, which can prevent fine particles from being carried away by wind erosion while allowing rainwater infiltration and water vapor exchange, thus effectively maintaining the micro-water cycle of the ground surface. This membrane layer can maintain soil moisture while preventing wind erosion and sand fixation, creating a favorable microenvironment for the natural restoration of vegetation. It uses sprayable ecological materials, eliminating the need for mechanical gravel covering or laying ecological mats during construction. Depending on the terrain, it can flexibly choose vehicle-mounted spraying, drone spraying, or pipeline delivery methods. The construction process is simple, efficient, and energy-saving, enabling rapid promotion and application in large-scale Gobi desert areas. The crusting agent used is composed entirely of plant fibers, natural polysaccharides, and biodegradable organic cross-linking agents, and contains no harmful chemical additives. After its service life, the material can naturally degrade and integrate with the soil, without causing secondary pollution to the environment, meeting the green and sustainable development requirements of ecological restoration projects. Detailed Implementation

[0014] The present invention will be further described below with reference to the embodiments.

[0015] This invention provides a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents. The overall design concept is guided by the principle of ecological natural reconstruction, which comprehensively utilizes the biodegradability of plant-derived organic polymer materials and the film-forming properties of natural polysaccharides. Through chemical modification and physical cross-linking, an ecological crusting layer that can quickly solidify the surface under arid and strong wind conditions and simulate the structure of natural gravel curtain layers is formed, thereby achieving rapid restoration and functional recovery of degraded Gobi surfaces.

[0016] (I) Technical Principles: The original "gravel-fine particle" double-layer structure of the Gobi Desert surface maintains a stable equilibrium in the natural environment through wind, evaporation, and capillary water movement. This invention artificially regulates this natural crust formation mechanism by using a modified plant fiber crusting agent to form a "porous, natural-like composite membrane" between the fine particles and gravel on the surface. This membrane possesses sufficient surface hardness and bonding strength to resist wind erosion while maintaining appropriate porosity and permeability to sustain surface water circulation.

[0017] This method uses plant fibers as the framework material and natural polysaccharides as the matrix component, supplemented with biodegradable cross-linking agents and inorganic additives. After compounding and modification, the mixture is sprayed onto the ground surface, and through a natural or artificially controlled drying and curing process, a "bionic biological crust layer" is formed on the ground surface. The interior of this crust layer has a porous fiber network structure, and the outer layer forms a continuous membrane surface, which can maintain long-term structural stability under high wind speeds and extreme temperature differences.

[0018] (II) Core Concept: 1. Using plant fibers as the ecological framework: Modified plant fibers possess excellent specific surface area and hydrophilicity, enabling them to form a spatial support framework on the earth's surface and interlock with fine-grained soil. After physicochemical modification, the surface hydroxyl activity of the fibers is enhanced, allowing them to undergo cross-linking reactions with natural polysaccharide molecules to form a stable three-dimensional network structure.

[0019] 2. Using natural polysaccharides as the film-forming matrix: Natural polysaccharides (such as xanthan gum, guar gum, and alginate) have excellent film-forming properties and biocompatibility. They play a "encapsulation-binding-slow release" role in the system, enabling the crust layer to form a continuous film after drying and maintaining a certain degree of flexibility to prevent cracking when the ambient humidity changes.

[0020] 3. Improve structural properties by using biodegradable crosslinking agents and inorganic additives: By introducing biodegradable crosslinking agents (such as citric acid and polylactic acid) and reinforcing inorganic additives (such as calcium silicate, bentonite or attapulgite powder), the mechanical strength and weather resistance of the crust layer are improved at the microscopic level, effectively improving the compressive strength and wind erosion resistance, thus effectively enhancing the crust layer's tolerance in wind erosion environments and reducing the wind erosion rate to below 0.1 kg / m²·h.

[0021] 4. Constructing a natural-looking multi-scale porous structure: By controlling the viscosity of the slurry and the spraying rate, the crusting agent forms capillary channels of 0.1–1.0 mm and micropores of 10–50 μm during the solidification process, thus retaining good water and air permeability (permeability coefficient of 1×10⁻³–1×10⁻³) after hardening. 4 (cm / s) to ensure surface water infiltration and gas exchange.

[0022] 5. Utilizing adaptive spraying and a two-stage curing mechanism: The initial spraying forms a preliminary film, accounting for approximately 40% of the total. Subsequent spraying, after the surface has initially hardened, involves a second layer of material that further penetrates and cross-links within the pores of the initial layer, creating a structural gradient layer of "dense core + microporous surface." This design effectively improves the film's resistance to wind erosion while maintaining water permeability within ±20% of the design tolerance.

[0023] (III) Function Implementation Mechanism: Within 24–48 hours after construction, the moisture in the material evaporates, and the fiber network gradually solidifies; the composite membrane layer formed by the cross-linking reaction of modified plant fibers and natural polysaccharides tightly binds the fine particles on the ground. The surface hardness of the crust layer can reach over 3.5 kg / cm², and the compressive strength is ≥0.8 MPa, effectively resisting erosion from wind speeds exceeding 20 m / s.

[0024] At the same time, the lower part of the crust layer still maintains a porosity of about 25%–35%, which can quickly infiltrate water after rainfall and slow down surface runoff, thereby achieving a closed loop of ecological functions of "preventing wind erosion, conserving water and promoting restoration".

[0025] The Gobi gravel curtain layer natural reconstruction and restoration method described in this invention uses a modified plant fiber crusting agent as the core material. This crusting agent, through the compounding and cross-linking modification of plant-derived organic polymer materials and inorganic additives, forms an ecological restoration material with excellent film-forming properties, weather resistance, water permeability, and biodegradability.

[0026] Its chemical system and preparation process can be divided into two parts: (1) preparation of modified plant fiber materials; (2) configuration of the skinning agent composite system.

[0027] I. Preparation of modified plant fiber materials: 1. Raw material selection: Plant fibers can be selected from natural sources such as wheat straw fiber, bamboo fiber, coconut shell fiber, cotton stalk fiber, or hemp fiber. Wheat straw or bamboo fiber are preferred because they have high cellulose content, stable structure, and are abundant.

[0028] 2. Pretreatment and crushing: After cleaning and removing impurities, the particles are dried (60-80℃, 4-6h) and then pulverized to an average particle size of 50-200μm.

[0029] Particle size distribution controlled within =Approximately 120μm, to ensure uniform suspension dispersion and film formation.

[0030] 3. Modification treatment: After alkaline activation and cross-linking modification, plant fibers have increased surface-active group content and enhanced binding ability with polysaccharide matrix.

[0031] The activation solution is sodium hydroxide (1-3 wt.%), the treatment temperature is 60-70℃, and the time is 1.0-1.5 h. After washing to neutrality, a cross-linking reaction is carried out in a modification solution containing citric acid (1-3 wt.%) or polylactic acid (2-5 wt.%). The reaction temperature is 70-80℃, and the time is 1.5-2.5 h. After modification, the proportion of hydroxyl-carboxyl groups on the fiber surface increases by 20-30%, and the static contact angle decreases to below 45°, exhibiting good hydrophilic adsorption properties.

[0032] 4. Drying and storage: After the reaction is complete, the modified plant fiber powder is prepared by hot air drying (50-60℃) until the moisture content is less than 5%.

[0033] II. Composition and Configuration of the Skin-Condensing Agent Complex System: The modified plant fiber skinning agent is formulated from the following components in the following mass percentages:

[0034] The compounding ratio can be adjusted according to the surface gravel coverage and the target membrane thickness: Gravel coverage <40%: Use 20wt.% concentration slurry; Gravel coverage 40%–50%: Use 15wt.% concentration slurry; Gravel coverage > 50%: Natural restoration is possible without human intervention.

[0035] III. Preparation process of composite system: 1. Mixing and Dispersion: Add measured deionized water to a mixing tank and heat to 35–45°C; add natural polysaccharides, modified plant fiber powder, and inorganic additives in sequence; stir at 500–800 rpm for 30–45 minutes to form a uniform suspension system; adjust the pH to 6.5–7.5 to ensure system stability.

[0036] 2. Crosslinking reaction stage: A biodegradable crosslinking agent is added, and the reaction temperature is maintained at 40–50°C. The reaction time is 20–30 minutes, and the viscosity of the system is controlled at 500–1500 mPa·s. A modified plant fiber-polysaccharide-inorganic auxiliary agent ternary crosslinking network system is formed.

[0037] 3. Slurry aging and filtration: After the reaction is complete, allow it to stand for 2-4 hours to fully release the bound water in the fiber structure; after filtration to remove unreacted large particles, a homogeneous skinning agent slurry is obtained. The slurry has a solid content of 15-20 wt.% and can be used directly for spraying.

[0038] IV. Material Performance Indicators Experimental testing (at a temperature of 25℃ and a relative humidity of 50%) showed that this skinning agent system has the following typical performance parameters:

[0039] The present invention provides a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents. The construction process is scientifically simplified and highly adaptable, allowing for multiple operation modes such as vehicle-mounted spraying, drone spraying, or pipeline delivery, depending on terrain conditions. The overall process includes four stages: surface treatment → material spraying → film formation and curing → quality inspection and maintenance.

[0040] S1: Ground surface treatment: S11: Cleaning and Leveling The area to be restored should be cleared, removing large gravel, weeds, and loose sand to ensure a smooth surface without obvious cracks. If necessary, light compaction can be done manually or mechanically to achieve a surface density of over 85%.

[0041] S12: Dust removal and humidification (optional step): If there is too much dust on the ground or the humidity is below 5%, the surface can be humidified to a moisture content of 2% to 4% in the form of fine mist before spraying to enhance the adhesion of the slurry and the uniformity of the initial film formation.

[0042] S2: Material spraying: S21: Spraying Equipment Selection: Different equipment is selected according to the scale of construction and terrain conditions: flat surfaces: vehicle-mounted spraying system (spray width 3-6m, nozzle diameter 1.5-2.0mm); sloping or scattered plots: backpack or drone spraying system (flight altitude 2-3m, spray speed 2-3m / s).

[0043] S22: Spraying parameter control: Spraying pressure: 0.3~0.5MPa; spray volume: 1.0~1.5L / m²; ambient temperature: 10~35℃; relative humidity: 40%~80%; wind speed not exceeding 6m / s.

[0044] S23: Two-stage spray film formation mechanism: Initial spraying stage: The initial spraying amount accounts for 40% to 50% of the total amount, forming an initial condensing film; Re-spraying stage: After the initial film has dried for 4-6 hours, a second spray is carried out to allow the slurry to penetrate into the pores of the initial film and cross-link and solidify, forming a gradient film structure of "dense core + microporous surface". Film thickness control: The final skin layer thickness should be maintained at 2-5 mm, and the surface should be continuous and free of cracks.

[0045] S3: Film forming and curing: S31: Natural curing conditions: Under normal temperature (20-30℃) and moderate humidity conditions, the material can form a continuous skin layer in 24-48 hours; under low temperature (<10℃) conditions, the curing time can be appropriately extended to 72 hours.

[0046] S32: Artificial assisted curing (optional) In dry, windy environments, micro-mist humidification or covering with a biodegradable moisturizing film can be used to control the evaporation rate and prevent the surface from cracking.

[0047] Film-forming performance indicators: surface hardness ≥3.5kg / cm²; compaction degree ≥90%; water permeability coefficient deviation ≤±20%; no obvious cracking, peeling, or blistering.

[0048] S4: Quality Inspection and Maintenance S41: Quality Inspection To ensure the repair effect and long-term stability, a system quality test must be conducted after construction. The test methods and indicators are as follows:

[0049] If the local test values ​​do not meet the requirements, local respraying can be used for repair.

[0050] S42: Maintenance and Care S421: Initial Maintenance: Heavy rainfall and vehicle or machinery should be avoided for 48 hours after construction is completed.

[0051] If local depressions or weak areas appear, they can be reinforced with spray within 5 days.

[0052] S422: High-temperature and arid environment: When the ambient temperature is above 35°C, a biodegradable moisturizing film (0.02–0.05 mm thick) can be applied within 24 hours of film formation to reduce the evaporation rate and increase the density of the skin.

[0053] S423: Mid-term Inspection and Regeneration Maintenance Inspect once a month. If a crack width > 2mm or a peeling area > 1m² is found, local repair spraying should be carried out.

[0054] Under natural conditions, the crust can maintain its complete structure for 2 to 3 years, after which it degrades naturally and merges with the surface, allowing the ecosystem to enter a natural succession stage.

[0055] In the technical design and implementation process, this invention employs a systematic performance control and testing evaluation system to ensure that the repair layer exhibits excellent mechanical stability, weather resistance, permeability, and ecological safety in the extreme environment of the Gobi Desert. The following details the performance requirements, testing methods, and control standards.

[0056] (I) Main technical performance indicators The main performance indicators of the natural-looking skin layer formed by the modified plant fiber skinning agent at different stages are as follows:

[0057] The system can maintain its structural integrity under typical Gobi wind speeds (15-25 m / s) and diurnal temperature ranges (20-40℃), without significant pulverization or peeling.

[0058] (II) Quality Control Process and Testing Nodes To ensure construction quality and ecological restoration effectiveness, the following multi-stage quality control system has been established: 1. Material preparation stage Check whether the viscosity, pH, and solids content of the slurry are within the specified range; randomly sample and test the fiber dispersibility and inorganic additive content; unqualified batches are strictly prohibited from entering the spraying process.

[0059] 2. Spraying construction stage Real-time monitoring of spray pressure and spray volume, with deviation controlled within ±10%; recording of ambient temperature, humidity and wind speed to ensure they are within suitable ranges; setting up one quality monitoring point every 500m² for sampling and testing of film thickness and uniformity.

[0060] 3. Curing and initial inspection stage (within 7 days) Use a handheld hardness tester to test the surface hardness of the film; if the hardness is lower than 3.5 kg / cm² in some areas, additional spraying and reinforcement are required; at the same time, conduct a visual inspection to ensure that there are no cracks, peeling or holes on the surface.

[0061] 4. Structural and weather resistance testing phase (within 28 days) Conduct compressive strength and permeability tests; the deviation of the double-ring permeability test results from the design value shall not exceed ±20%; if the test fails, it shall be repaired and retested within 7 days.

[0062] 5. Mid- to long-term performance evaluation (6 months to 1 year) Wind tunnel simulation tests were used to evaluate wind erosion resistance; biodegradation rate and ecological compatibility were monitored; and the natural vegetation restoration rate was assessed (≥60% was considered acceptable).

[0063] Compared with related technologies, the natural reconstruction and repair method for Gobi gravel curtain layers based on modified plant fiber crusting agents provided by this invention has the following beneficial effects: This invention provides a method for the natural reconstruction and restoration of Gobi gravel curtain layers based on modified plant fiber crusting agents. By simulating the formation mechanism of natural gravel curtain layers, a porous composite structure is constructed using plant fibers and natural polysaccharides. This results in a crust layer that closely resembles natural surface crust in both morphology and function. This structure is compatible with the original soil, maintains the continuity of the surface ecosystem, and promotes the natural recovery of microorganisms and vegetation, thereby achieving organic integration with the natural environment. Through the composite cross-linking of organic and inorganic materials, a continuous and stable three-dimensional network structure is formed in the crust layer. This structure can remain intact under long-term wind erosion, temperature fluctuations, and wet-dry cycles, without cracking, peeling, or pulverization, ensuring the long-term stability of the restoration layer. It possesses excellent wind erosion resistance; the formed natural-looking crust layer has a reasonable porous structure, which can prevent fine particles from being carried away by wind erosion while allowing rainwater infiltration and water vapor exchange, thus effectively maintaining the micro-water cycle of the ground surface. This membrane layer can maintain soil moisture while preventing wind erosion and sand fixation, creating a favorable microenvironment for the natural restoration of vegetation. It uses sprayable ecological materials, eliminating the need for mechanical gravel covering or laying ecological mats during construction. Depending on the terrain, it can flexibly choose vehicle-mounted spraying, drone spraying, or pipeline delivery methods. The construction process is simple, efficient, and energy-saving, enabling rapid promotion and application in large-scale Gobi desert areas. The crusting agent used is composed entirely of plant fibers, natural polysaccharides, and biodegradable organic cross-linking agents, and contains no harmful chemical additives. After its service life, the material can naturally degrade and integrate with the soil, without causing secondary pollution to the environment, meeting the green and sustainable development requirements of ecological restoration projects.

[0064] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for natural reconstruction of Gobi gravel curtain layer based on modified plant fiber skinning agent, characterized in that, The method comprises the following steps: S1: ground base surface treatment: clean and flatten the gobi surface to be repaired; S2: material spraying: use a two-stage spraying process to spray the modified plant fiber skinning agent slurry on the treated surface; the two-stage spraying process comprises a preliminary spraying stage and a supplementary spraying stage, the preliminary spraying stage sprays 40-50% of the total amount of slurry to form a initial curing film, and after the initial curing film is cured for 4-6 hours, the supplementary spraying stage is performed to spray the remaining slurry into the pores of the initial curing film for cross-linking and curing; S3: film formation and curing: allow the sprayed slurry to cure for 24-72 hours under natural or auxiliary conditions to form a natural-imitating skin layer with a thickness of 2-5 mm; S4: quality detection and maintenance: detect the performance of the cured skin layer, and repair the areas that do not meet the standards by supplementary spraying; The modified plant fiber skinning agent is prepared by mixing, dispersing and cross-linking the following components in the following mass percentages: modified plant fiber 3-8%, natural polysaccharide 0.5-2%, biodegradable cross-linking agent 0.2-1.5%, enhanced inorganic additive 1-5%, and the balance being deionized water.

2. The method for natural reconstruction of Gobi gravel curtain layer according to claim 1, characterized in that, Before S2, the method further comprises determining the concentration of the skinning agent slurry: adaptively determining the use concentration of the skinning agent slurry according to the gravel coverage of the surface to be repaired; when the gravel coverage is less than 40%, the use concentration is 20wt.%; when the gravel coverage is 40-50%, the use concentration is 15wt.%.

3. The method according to claim 1, wherein the method is characterized by, The preparation method of the modified plant fiber comprises: a. selecting natural plant fiber raw materials, cleaning, drying and crushing to an average particle size of 50-200μm; b. alkali activation treatment of the fibers at 60-70℃ for 1.0-1.5 hours using 1-3wt% sodium hydroxide solution, and washing to neutral; c. placing the activated fibers in a modification liquid containing 1-3wt% citric acid or 2-5wt% polylactic acid solution, which is a good solvent solution or dispersion of polylactic acid, and performing cross-linking reaction at 70-80℃ for 1.5-2.5 hours; d. after the reaction is completed, drying treatment is performed to obtain modified plant fiber powder with a water content of less than 5%.

4. The method for natural reconstruction of Gobi gravel curtain layer according to claim 1, characterized in that, The natural polysaccharide is selected from at least one of xanthan gum, guar gum, sodium alginate and starch derivatives; the biodegradable cross-linking agent is selected from at least one of citric acid, polylactic acid and polyglycolic acid; and the enhanced inorganic additive is selected from at least one of silicates, attapulgite, bentonite and aluminum oxide powder.

5. The method for natural reconstruction of Gobi gravel curtain layer according to claim 1, characterized in that, In S2, the construction parameters for spraying are: spraying pressure 0.3-0.5MPa, unit area spraying amount 1.0-1.5L / m², environmental temperature 10-35℃, relative humidity 40-80%, and wind speed not more than 6m / s.

6. The method for natural reconstruction of Gobi gravel curtain layer according to claim 1, wherein, The surface hardness of the pseudo-natural skin layer formed in the S3 is ≥ 3.5 kg / cm2, the compressive strength is ≥ 0.8 MPa, the permeability coefficient is 1×10-3 ~ 1×10-2 cm / s, and the wind erosion rate under a wind speed of 20 m / s is ≤ 0.1 kg / m2·h. 4 cm / s, and the wind erosion rate under a wind speed of 20 m / s is ≤ 0.1 kg / m2·h.

7. The method for natural reconstruction of Gobi gravel curtain layer according to claim 1, characterized in that, In S4, the quality detection comprises detecting the surface hardness and apparent integrity of the skin layer within 7 days after construction, detecting the compressive strength and permeability within 28 days, and evaluating the wind erosion resistance and natural vegetation recovery rate within 6 months to 1 year.

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