A soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics

Abstract

The application relates to the field of ecological restoration, and discloses a soil carbon fixation restoration method for the freeze-thaw characteristics of plateau peat land, which comprises the following steps: S1, on-site data collection and raw material preparation: collecting data of a construction site of the plateau peat land through a collection tool, and preparing a restoration matrix material; S2, threat level weight distribution and establishment of a comprehensive restoration base value coefficient: based on the collected data in step S1, the weight of physical stress data and chemical stress data is distributed, and then the comprehensive restoration base value coefficient is established according to the weight values of the distributed physical stress data and chemical stress data; S3, dynamic adjustment of a formula and precise adaptation of construction: the comprehensive restoration base value coefficient obtained in step S2 is used to adjust the formula of the restoration base value material prepared in step S1 and adapt the construction. Through on-site data collection and stress index construction, the restoration prescription can accurately match the specific stress type of the site, and precise construction is realized.

Description

Technical Field

[0001] This invention relates to the field of ecological restoration technology, specifically a soil carbon sequestration and remediation method for plateau peatlands with freeze-thaw characteristics. Background Technology

[0002] Highland peatlands are key carbon sinks in the global carbon cycle, storing massive amounts of organic carbon. However, these ecosystems are extremely sensitive to climate change and are facing severe threats of degradation. In the high-altitude, cold environment of the plateau, intense freeze-thaw cycles are the main physical stressors leading to peatland degradation. On the one hand, excessively high soil moisture content generates enormous frost heave when the soil freezes in winter, destroying the soil aggregate structure. On the other hand, after thawing in summer, the damaged soil undergoes thaw subsidence, compaction, and soil erosion, resulting in a sharp decline in the stability of the physical structure.

[0003] On the other hand, the physical degradation caused by this freeze-thaw cycle further exacerbates chemical and biological stress. When permafrost thaws, a large amount of active organic carbon that was previously frozen is exposed to microorganisms. Under suitable pH and temperature conditions, microbial activity is rapidly activated, leading to the rapid decomposition of organic carbon and its release in large quantities as carbon dioxide and methane—a post-thaw carbon burst. This transforms degraded peatlands from carbon sinks into carbon sources.

[0004] Current remediation technologies for high-altitude peatlands often struggle to simultaneously address the dual and conflicting challenges of physical and chemical stresses. Existing remediation methods frequently employ a one-size-fits-all approach, focusing solely on vegetation restoration or physical dam reinforcement, lacking precise diagnosis of the specific stress types at the construction site. This approach fails to recognize that in some locations, the primary concern may be physical structural collapse, while in others, it may be the risk of chemical carbon sequestration. Consequently, existing technologies generally lack a mechanism for dynamic feedback and precise adjustment of remediation formulations based on on-site data, resulting in poor remediation outcomes and difficulty in maintaining long-term effectiveness, failing to synergistically address the dual objectives of physical stabilization and chemical carbon sequestration. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a soil carbon sequestration and remediation method for the freeze-thaw characteristics of plateau peatlands. This method solves the problem that existing remediation technologies cannot accurately diagnose the type of on-site stress and dynamically adjust the formulation, making it difficult to coordinate the two conflicting remediation issues of physical frost heave damage and chemical carbon bursts.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a soil carbon sequestration and remediation method for plateau peatlands, comprising the following steps: S1. On-site data collection and raw material preparation: Data on the construction site of the plateau peatland is collected using data collection tools, and the collected data is divided into physical stress data and chemical stress data. At the same time, remediation matrix materials are prepared. S2. Threat level weight allocation and establishment of comprehensive repair baseline coefficient: Based on the physical stress data and chemical stress data collected in step S1, the scenarios are divided, and the weights of physical stress data and chemical stress data are allocated according to the scenario division. Then, the comprehensive repair baseline coefficient is established according to the allocated weight values ​​of physical stress data and chemical stress data. The process of establishing a comprehensive repair baseline coefficient based on weighted values ​​includes: in: Represents the comprehensive repair baseline coefficient; This represents the weight of the physical stress data, with values ​​of 0.9, 0.3, or 0.5. This represents the weight of the chemical stress data, with values ​​of 0.1, 0.7, or 0.5. The scenario division is based on the fact that, during the carbon sequestration and remediation process of soils with freeze-thaw characteristics in plateau peatlands, the actual physical stress data and chemical stress data on site differ. Through subsequent steps, and based on the comprehensive remediation baseline coefficient, different proportions of remediation matrix materials are used according to the actual physical stress data and chemical stress data on site to achieve targeted and precise remediation effects. The scenario division includes: physical stress-dominated scenario, chemical stress-dominated scenario, and mixed stress-dominated scenario. S3. Dynamically adjust the formula and precisely adapt the construction: Based on the comprehensive repair base value coefficient obtained in step S2, adjust the formula and adapt the construction of the repair base value material prepared in step S1 to achieve dynamic formula adjustment and precise construction.

[0007] Preferably, in step S1, the data collection tools include: a TDR probe, a simple osmometer, a potassium permanganate oxidation method field velocity measurement box, and a portable pH meter; the physical stress data include: volumetric water content and soil structural stability; the chemical stress data include: active organic carbon and soil pH.

[0008] Preferably, in step S1, the repair matrix material comprises a combination of a repair fluid A and a catalytic liquid B. The repair fluid A specifically consists of 1.0%-3.0% sodium alginate, 97%-99% dynamic ratio repair agent, and water to make up the balance. The catalytic liquid B specifically consists of 2.0%-5.0% calcium lactate and water to make up the balance.

[0009] Preferably, the dynamic ratio repair agent comprises glycerin and tannic acid, wherein the ratio of glycerin to tannic acid is 1:(0.56-11.7).

[0010] Preferably, step S3 includes: S301. Formula adjustment based on comprehensive repair baseline coefficient: Calculate the real-time formula adjustment ratio of glycerol and tannic acid in the A solution repair fluid according to the comprehensive repair baseline coefficient determined in step S2 and the calibration constant obtained from the calibration experiment. S302, Adaptation and Construction: Prepare Solution A repair fluid according to the adjusted ratio of glycerin and tannic acid formula in step S301, and at the same time prepare Solution B catalytic fluid. S303. Application process: The A-liquid remediation fluid and B-liquid catalytic fluid, which are dynamically prepared in step S302, are applied to the target soil through the process flow.

[0011] Preferably, in step S303, the process flow includes: Substrate placement: The A-liquid repair fluid prepared according to the formula adjustment ratio in step S302 and the B-liquid catalytic fluid prepared at the same time are respectively introduced into two independent non-corrosive containers equipped with high-pressure injection pumps and injection pipelines at the construction site for temporary storage. Two-step grouting: Performing two sequential grouting steps with specific time intervals to ensure effective distribution of components in the soil. The first step is to use a high-pressure injection pump to inject the A-liquid remediation fluid stored in a polyethylene storage tank into the peat surface soil to be remediated according to a predetermined grid through the injection pipeline. The second step involves giving the A-liquid remediation fluid a predetermined infiltration time to allow it to fully disperse in the soil pores. Then, through the original injection port, the B-liquid catalytic liquid stored in the polyethylene tank is injected into the same soil area from the first step. In-situ crosslinking reaction: When the B-liquid injected later in the second step comes into contact with the A-liquid remediation fluid already present in the soil pores, the calcium lactate in the B-liquid is released. The ions undergo an in-situ ionic cross-linking reaction with sodium alginate in solution A. Repair matrix formation: Wait for the in-situ ionic cross-linking reaction to occur for 1-2 hours, allowing the repair fluid A and the catalytic fluid B to form a three-dimensional hydrogel network in the soil pores. At this point, stop all mechanical disturbance to the construction area and allow the gel to fully solidify, thus forming the final repair matrix.

[0012] Preferably, in the substrate arrangement, the non-corrosive container preferably includes a polyethylene storage tank; in the two-step injection method, the predetermined grid is a 1m x 1m to 2m x 2m grid; and the predetermined infiltration time is 30-60 minutes.

[0013] An application of a soil carbon sequestration and remediation method targeting the freeze-thaw characteristics of plateau peatlands has been developed and applied to the field of ecological restoration, particularly in the ecological restoration of degraded plateau peat wetlands.

[0014] This invention provides a soil carbon sequestration and remediation method targeting the freeze-thaw characteristics of peatlands in high-altitude areas. It has the following beneficial effects: 1. Through the on-site data collection and stress index construction in step S1, this invention can quantitatively diagnose whether the main contradiction of the soil on site is physical or chemical stress, and dynamically adjust the formulation ratio of glycerol and tannic acid in the A solution remediation fluid, so that the remediation prescription can accurately match the specific stress type on site, realizing adaptive and precise construction from diagnosis to prescription.

[0015] 2. This invention combines glycerol, which addresses physical stress, and tannic acid, which addresses chemical stress, in the same A-liquid repair stream. In step S303, both are encapsulated together in a three-dimensional hydrogel network through an in-situ crosslinking reaction. This design solves the problem of conflicting repair objectives related to physical and chemical stresses, and is further enhanced by step S301. Quantitative regulation has found a balance point, and the resulting remediation matrix can simultaneously exert the dual effects of flexible antifreeze and inhibiting carbon release, achieving synergistic effects.

[0016] 3. The application process of this invention adopts a two-step injection method: first, the A-liquid repair fluid penetrates, and then the B-liquid catalytic liquid is released. This design allows the A-liquid repair fluid and the B-liquid catalytic liquid to undergo an in-situ cross-linking reaction in the soil pores. The resulting gel network can anchor loose peat particles, achieving minimally invasive reinforcement of the soil structure. More importantly, this in-situ formed matrix can permanently seal the glycerol and tannic acid dynamically prepared in step S302 in the soil microenvironment, slowing down the loss of functional components, thereby ensuring precise and long-term repair of plateau freeze-thaw stress. Attached Figure Description

[0017] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a flowchart of step S3 in the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see the appendix Figure 1 - Appendix Figure 2This invention provides a soil carbon sequestration and remediation method for plateau peatlands with freeze-thaw characteristics, comprising the following steps: S1. On-site data collection and raw material preparation: Data on the construction site of the plateau peatland is collected using data collection tools, and the collected data is divided into physical stress data and chemical stress data. At the same time, remediation matrix materials are prepared. The collection tools include: TDR probe, simple osmometer, potassium permanganate oxidation method field velocity measurement kit and portable pH meter; Data from the construction site in the high-altitude peatland includes: physical stress data and chemical stress data; The physical stress data include: volumetric water content and soil structural stability; The chemical stress data included: active organic carbon and soil pH. Data collection methods include: First, at least five sampling points were randomly set up in the construction site area of ​​the plateau peatland to be restored to ensure that the collected data can represent the average stress status of the site. At each sampling point, the metal waveguide rod of the TDR probe is vertically and completely inserted into the surface soil of the peatland to be remediated, with an insertion depth of 15cm or 30cm, so as to collect volumetric water content data. Near each sampling point, the permeameter ring or permeameter disc is gently pressed into the soil surface to collect the saturated hydraulic conductivity or steady-state permeability of the soil structure. At each sampling point, a soil sample was collected from the surface using a soil auger. The soil samples from the five sampling points were mixed in equal amounts to form a mixed soil sample for the construction site. The active organic carbon content was then calculated using a potassium permanganate oxidation method on-site velocity measurement kit. At each sampling point, a certain mass of soil sample was weighed and mixed with deionized water in a clean beaker at a solid-liquid ratio of 1:2.5. A portable pH meter was then inserted into the supernatant or mud to read the pH value of the stabilized soil. The repair matrix material consists of a combination of repair fluid A and catalytic liquid B. Repair fluid A specifically comprises: sodium alginate 1.0%-3.0%, dynamic ratio repair agent 97%-99%, and water to make up the balance. Catalytic liquid B specifically comprises: calcium lactate 2.0%-5.0%, and water to make up the balance. The dynamic ratio repair agent includes: glycerol and tannic acid, with the ratio of glycerol to tannic acid being 1:0.56-11.7. S2. Threat Level Weight Allocation and Establishment of Comprehensive Remediation Baseline Coefficient: Based on the physical and chemical stress data collected in step S1, scenarios are divided, and weights for physical and chemical stress data are allocated according to the scenario division. Then, a comprehensive remediation baseline coefficient is established based on the allocated weight values ​​of physical and chemical stress data. The scenario division takes into account that in the process of carbon sequestration and remediation of soils with freeze-thaw characteristics in plateau peatlands, the actual physical and chemical stress data values ​​on site are different. Through subsequent steps, and based on the comprehensive remediation baseline coefficient, different proportions of remediation matrix materials are used for the actual physical and chemical stress data values ​​on site to achieve targeted and precise remediation effects. The process involves dividing the data into scenarios and assigning weights to physical and chemical stress data based on these scenarios, including: Physical coercion-dominated scenarios: The collected data from the construction site in the high-altitude peatland are as follows: A volumetric water content greater than 80% indicates that the soil under construction is close to saturation and has extremely high frost heave. A soil structure stability of <3 indicates that the current construction soil structure is extremely poor and is very prone to settling. A soil pH value < 4.5 indicates that the soil is too acidic during the current construction phase, which inhibits microbial activity. Therefore, the main challenges in current soil remediation are frost heave and thaw settlement, with a low risk of microbial outbreaks. The weighting is as follows: physical stress data = 0.9, chemical stress data = 0.1. Chemical stress is the dominant scenario: The collected data from the construction site in the high-altitude peatland are as follows: A volumetric water content of <60% indicates that the frost heave of the soil under current construction is controllable; A soil structure stability value greater than 5 indicates that the soil structure under construction is relatively stable. An active organic carbon concentration greater than 1000 mg / kg indicates sufficient food for microorganisms in the current construction soil. A soil pH value of 4.5 < 6.0 indicates that the current soil pH is within the optimal range for microbial activity. Therefore, the main challenge in current soil remediation is the carbon burst following thawing, and the risk of physical damage is controllable. The weighting is as follows: physical stress data = 0.3, chemical stress data = 0.7. Mixed stress-dominated scenarios: When the collected data from the construction site in the high-altitude peatland does not meet the specific combination of the above-mentioned physical stress-dominant scenario or chemical stress-dominant scenario, including: Volumetric water content > 80%, and activated organic carbon > 1000 mg / kg; Therefore, the main challenge in current soil remediation is the coexistence of physical and biochemical risks, with the following weighting: physical stress data = 0.5, chemical stress data = 0.5. A comprehensive repair baseline coefficient is established based on the weighted values, including: in: Represents the comprehensive repair baseline coefficient; This represents the weight of the physical stress data, with values ​​of 0.9, 0.3, or 0.5. This represents the weight of the chemical stress data, with values ​​of 0.1, 0.7, or 0.5. S3. Dynamic Formula Adjustment and Precise Adaptation for Construction: Using the comprehensive repair baseline coefficient obtained in step S2, the repair baseline materials prepared in step S1 are adjusted in formula and adapted for construction to achieve dynamic formula adjustment and precise adaptation for construction, including: S301. Formula Adjustment Based on Comprehensive Repair Baseline Coefficient: Based on the comprehensive repair baseline coefficient determined in step S2 and the calibration constant obtained from the calibration experiment, calculate the real-time formula adjustment ratio of glycerol and tannic acid in the A solution repair fluid; the relationship between the formula adjustment ratio and the comprehensive repair baseline coefficient follows the following formula: in: Representative formulation conditions ratio; G represents the mass of glycerol added to solution A; T represents the mass of tannic acid added to solution A; Represents the comprehensive repair baseline coefficient; This represents the calibration constant, which has a value range of 0.5 ≤ C ≤ 1.5. The calibration constant is obtained through calibration experiments, which include: The determination was made through laboratory stress and response calibration experiments on typical soil samples from the target plateau peatland, including: S-C1, analysis of benchmark soil samples and determination of benchmark comprehensive repair base value coefficient: Representative soil samples were collected from the high-altitude peatlands.

[0020] Using the sampling tools in S1, the volumetric water content, soil structure index, active organic carbon, and soil pH of the reference soil sample were determined.

[0021] Based on the weighting rules in S2, the weights of the baseline physical stress data and the baseline chemical stress data of the reference soil sample are determined, and the comprehensive remediation baseline value coefficient is calculated.

[0022] (For example, a typical mixed-stress soil sample has a baseline comprehensive repair coefficient of 1.0.) S-C2, Preparation of gradient FRR repair matrix: The reference soil samples are divided into several groups, such as groups A, B, C, D, and E.

[0023] Multiple sets of solution A repair fluids were prepared, in which the sodium alginate concentration was kept constant at 2%, but the formulation ratio in solution A was varied according to a preset gradient to cover the potential range of the calibration constant C.

[0024] Example: Group A: FRR=0.4; Group B: FRR=0.7; Group C: FRR=1.0; Group D: FRR=1.3; Group E: FRR=1.6; Prepare solution B with a constant concentration, such as 3%, of calcium lactate; S-C3, Sample Preparation and Freeze-Thaw Stress Simulation: Different formulations of solution A and solution B from S-C2 were applied to the reference soil sample group of S-C1 to allow in-situ gelation and formation of the repaired soil sample.

[0025] All treated soil samples were placed in a programmable high and low temperature alternating test chamber for standardized freeze-thaw cycle stress simulation.

[0026] For example: Freeze at -10°C for 12 hours, then thaw at +10°C for 12 hours. This is one cycle, and a total of 10 cycles are performed.

[0027] S-C4, Dual Assessment of Repair Effect: After the standardized freeze-thaw cycle stress simulation was completed, the remediation effect of each soil sample group was evaluated in two dimensions: physical and chemical. Evaluation of physical remediation effectiveness: The soil structural stability of each soil sample group was measured after freeze-thaw cycles. A higher SSI value indicates a better physical remediation effect.

[0028] Evaluation of chemical remediation effectiveness: Each soil sample was placed in a constant temperature incubator, such as at 15°C, and the cumulative greenhouse gas release over 48 hours was measured using gas chromatography or an infrared gas analyzer. The lower the release, the better the chemical remediation effect. Determination of the optimal ratio adjustment ratio for S-C5: Analyzing the S-C4 data, since the optimization objectives of physics and chemistry are opposite, a comprehensive optimal solution needs to be found.

[0029] Establish a comprehensive evaluation function For example, using a normalized weighted scoring method, we can find the score that makes... The highest-scoring sample group; including A normalized weighted scoring method was adopted. It can be represented as: in: Normalized score for physical repair effectiveness (such as SSI improvement rate); The normalized score for the effectiveness of chemical remediation (e.g., gas release); and Weighting coefficients for physical and chemical assessments ( ); The FRR corresponding to the best sample group is determined as the optimal formulation adjustment ratio (FRR_{opt}), which includes: it was found through experiments that the physical structure (Eff_{P1}) of group D (FRR=1.3) was significantly improved, while the increase in gas release (Eff_{P2}) was still within an acceptable range. Its overall score was the highest, so FRR_{opt}=1.3). S-C6, Calculation of calibration constant: Substitute the optimal formulation adjustment ratio obtained from S-C5 and the baseline comprehensive remediation base value coefficient obtained from S-C1 into the following formula: in: The calibration constant representing the optimal sample group in the calibration experiment; The optimal formulation adjustment ratio represents the best sample group in the calibration experiment; The comprehensive repair baseline coefficient representing the best sample group in the experiment; when , ,but ); The resulting calibration constant ,For example This constant serves as the legal basis for guiding subsequent on-site adaptation construction of S3. The value falls within Within the range.

[0030] S302. Adaptation and Application: Prepare Solution A (repair fluid) according to the adjusted ratio of glycerin and tannic acid as described in step S301. Simultaneously, prepare Solution B (expansion fluid), including: When S2 is determined to be a scenario dominated by physical stress, the on-site staff calculate the formula adjustment ratio according to the formula: Construction Instructions: Press immediately Prepare solution A for repair fluid, where the mass of glycerol added to solution A is 11.7 times that of tannic acid; When S2 is determined to be a chemical stress-dominated scenario, the on-site staff calculate the formulation adjustment ratio according to the formula: Construction instructions: Immediately prepare Solution A repair fluid according to the formula adjustment ratio = 0.56, that is, the mass of glycerol added to Solution A is 0.56 times that of tannic acid; When S2 is determined to be a scenario dominated by mixed stress, the on-site staff calculates the formulation adjustment ratio according to the formula: Construction instructions: Immediately prepare solution A repair fluid according to the formula adjustment ratio = 1.3, that is, the mass of glycerol added to solution A is 1.3 times that of tannic acid; S303. Application Process: The dynamically prepared A-liquid remediation fluid and B-liquid catalytic fluid from step S302 are applied to the target soil through a process flow, including: Substrate application: The A-liquid repair fluid, prepared according to the formula adjustment ratio in step S302, and the simultaneously prepared B-liquid catalytic fluid, are respectively introduced into two independent non-corrosive containers at the construction site, each equipped with a high-pressure injection pump and injection pipeline for temporary storage; the non-corrosive containers preferably include polyethylene storage tanks. Two-step grouting: Performing two sequential grouting steps with specific time intervals to ensure effective distribution of components in the soil. The first step involves using a high-pressure injection pump to inject the A-liquid remediation fluid stored in a polyethylene storage tank into the peat surface soil to be remediated through an injection pipeline, arranged in a predetermined grid. The predetermined grid consists of 1m x 1m. The second step involves giving the A-liquid remediation fluid a predetermined infiltration time to allow it to fully disperse in the soil pores. Then, through the original injection port, the B-liquid catalytic liquid stored in the polyethylene storage tank is injected into the same soil area from the first step. The predetermined infiltration time includes 30-60 minutes. In-situ crosslinking reaction: When the B-liquid injected later in the second step comes into contact with the A-liquid remediation fluid already present in the soil pores, the calcium lactate in the B-liquid is released. The ions undergo an in-situ ionic cross-linking reaction with sodium alginate in solution A. Repair matrix formation: Wait for the in-situ ionic cross-linking reaction to occur for 1-2 hours, allowing the repair fluid A and the catalytic fluid B to form a three-dimensional hydrogel network within the soil pores. At this point, stop all mechanical disturbance to the construction area and allow the gel to fully solidify. The resulting repair matrix, through the three-dimensional hydrogel network, re-anchors the loose peat particles and seals the glycerol and tannic acid in the repair fluid A, which have a specific formulation adjustment ratio, within the soil aggregate microenvironment, thereby achieving precise and long-term repair of the specific stresses identified in step S2.

[0031] Example 1: This embodiment of the invention provides a soil carbon sequestration and remediation method for plateau peatlands, targeting the freeze-thaw characteristics, comprising the following steps: S1. On-site Data Collection and Raw Material Preparation: At a construction site in a high-altitude peatland, staff used data collection tools to collect data at 5 random sampling points, and the average values ​​are as follows: Volumetric water content: 85%, Soil structural stability: 2, Active organic carbon: 700 mg / kg, Soil pH: 4.2; Simultaneously prepare the repair matrix materials: Solution A repair fluid: sodium alginate, glycerin, tannic acid, and water; and Solution B catalytic fluid: calcium lactate and water; S2, Threat Level Weight Allocation and Establishment of Comprehensive Remediation Base Value Coefficient Based on S1 data, meet the conditions of volumetric water content > 80%, soil structure stability < 3 and soil pH < 4.5; Scenario Classification: The main challenges in current soil remediation are identified as frost heave and thaw settlement, with a low risk of microbial outbreaks, classifying it as a scenario dominated by physical stress. Weighting: Weights for physical stress data Chemical stress data weighting ; Establishing a baseline value: Based on the calculation example in S302, the comprehensive repair baseline value coefficient corresponding to this scenario. ; S3, Dynamically Adjusted Formula and Precise Application: S301. Formula adjustment based on comprehensive repair baseline coefficient: Assuming that the calibration constant for this site has been determined through calibration experiments from S-C1 to S-C6. On-site staff calculated the formula adjustment ratio according to the formula: ; S302, Adaptation and Construction: Construction Instructions: Immediately press... Prepare solution A for repair fluid; Solution A repair fluid: Sodium alginate 2.0%, dynamic ratio repair agent 98%, of which the mass of glycerol is 11.7 times the mass of tannic acid, and water is used to make up the balance; Solution B for catalyzing the reaction: 3.0% calcium lactate, water to make up the remainder; S303, Application Process: Substrate preparation: The prepared solutions A and B are respectively poured into two independent polyethylene storage tanks; Two-step infusion: The first step involves using a high-pressure injection pump to inject the A-liquid remediation fluid into the peat surface soil to be remediated, according to a predetermined grid of 1m x 1m. The second step is to wait 45 minutes to allow solution A to fully penetrate. Then, inject solution B, the catalytic liquid, into the same soil area through the original injection port. Repair matrix formation: Stop all mechanical disturbance and wait for the in-situ cross-linking reaction for 1.5 hours to allow solution A and solution B to form a three-dimensional hydrogel network in the soil pores, thus completing the repair.

[0032] Beneficial effects of Example 1: This example addresses a scenario dominated by physical stress, where the main challenges are extreme frost heave damage and thaw settlement risk. The formulation precisely strengthens physical protection, effectively buffering the enormous ice crystal expansion stress generated during freezing of high-moisture-content soil, thus significantly reducing frost heave damage. Simultaneously, the gel network enhances the overall soil structure, effectively preventing thaw settlement and collapse after thawing. This method achieves maximum restoration of physical structural stability with minimal chemical intervention cost.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil carbon sequestration and remediation method targeting the freeze-thaw characteristics of plateau peatlands, characterized in that, Includes the following steps: S1. On-site data collection and raw material preparation: Data on the construction site of the plateau peatland is collected using data collection tools, and the collected data is divided into physical stress data and chemical stress data. At the same time, remediation matrix materials are prepared. In step S1, the repair matrix material is composed of a repair fluid A and a catalyst liquid B. The repair fluid A specifically consists of: sodium alginate 1.0%-3.0%, dynamic ratio repair agent 97%-99%, and water to make up the balance; the catalyst liquid B specifically consists of: calcium lactate 2.0%-5.0%, and water to make up the balance. The dynamic ratio repair agent comprises glycerin and tannic acid, wherein the mass ratio of glycerin to tannic acid is 1:(0.56-11.7). S2. Threat level weight allocation and establishment of comprehensive repair baseline coefficient: Based on the physical stress data and chemical stress data collected in step S1, the scenarios are divided, and the weights of physical stress data and chemical stress data are allocated according to the scenario division. Then, the comprehensive repair baseline coefficient is established according to the allocated weight values ​​of physical stress data and chemical stress data. S3. Dynamically adjust the formula and precisely adapt the construction: Based on the comprehensive repair base value coefficient obtained in step S2, adjust the formula and adapt the construction of the repair matrix material prepared in step S1 to achieve dynamic adjustment of the formula and precise adaptation of the construction. Step S3 includes: S301. Formula adjustment based on comprehensive repair baseline coefficient: Calculate the real-time formula adjustment ratio of glycerol and tannic acid in the A solution repair fluid according to the comprehensive repair baseline coefficient determined in step S2 and the calibration constant obtained from the calibration experiment. S302, Adaptation and Construction: Prepare Solution A repair fluid according to the adjusted ratio of glycerin and tannic acid formula in step S301, and at the same time prepare Solution B catalytic fluid. S303. Application process: The A-liquid remediation fluid and B-liquid catalytic fluid, which are dynamically prepared in step S302, are applied to the target soil through the process flow.

2. The soil carbon sequestration and remediation method for plateau peatlands according to claim 1, characterized in that, In step S1, the data collection tools include: a TDR probe, a simple osmometer, a potassium permanganate oxidation method field velocity measurement box, and a portable pH meter; the physical stress data include: volumetric water content and soil structural stability; the chemical stress data include: active organic carbon and soil pH.

3. A soil carbon sequestration and remediation method for plateau peatlands based on freeze-thaw characteristics, as described in claim 1, is characterized in that... In step S303, the process flow includes: Substrate placement: The A-liquid repair fluid prepared according to the formula adjustment ratio in step S302 and the B-liquid catalytic fluid prepared at the same time are respectively introduced into two independent polyethylene storage tanks at the construction site, which are equipped with high-pressure injection pumps and injection pipelines for temporary storage. Two-step grouting: Performing two sequential grouting steps with time intervals to ensure effective distribution of components in the soil. The first step is to use a high-pressure injection pump to inject the A-liquid remediation fluid stored in a polyethylene storage tank into the peat surface soil to be remediated according to a predetermined grid through the injection pipeline. The second step involves giving the A-liquid remediation fluid a predetermined infiltration time to allow it to fully disperse in the soil pores. Then, through the original injection port, the B-liquid catalytic liquid stored in the polyethylene tank is injected into the same soil area from the first step. In-situ crosslinking reaction: When the B-liquid injected later in the second step comes into contact with the A-liquid remediation fluid already present in the soil pores, the calcium lactate in the B-liquid is released. The ions undergo an in-situ ionic cross-linking reaction with sodium alginate in solution A. Repair matrix formation: Wait for the in-situ ionic cross-linking reaction to occur for 1-2 hours, allowing the repair fluid A and the catalytic fluid B to form a three-dimensional hydrogel network in the soil pores. At this point, stop all mechanical disturbance to the construction area and allow the gel to fully solidify, ultimately forming the repair matrix.

4. A soil carbon sequestration and remediation method for plateau peatlands based on freeze-thaw characteristics, as described in claim 3, is characterized in that... In the two-step infusion method, the predetermined grid is 1m x 1m to 2m x 2m; the predetermined infiltration time is 30-60 minutes.

5. An application of a soil carbon sequestration and remediation method targeting the freeze-thaw characteristics of plateau peatlands, comprising the soil carbon sequestration and remediation method targeting the freeze-thaw characteristics of plateau peatlands as described in any one of claims 1-4, characterized in that, It is applied in the field of ecological restoration of degraded peat wetlands in plateau areas.

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