Soil carbon sequestration remediation method aiming at freeze-thaw characteristics of plateau peat land

Abstract

The invention relates to the field of ecological restoration, and discloses a soil carbon sequestration restoration method aiming at plateau peat land freeze-thaw characteristics, which comprises the following steps: S1, on-site data acquisition and raw material preparation: acquiring data of a plateau peat land construction site through an acquisition tool, and preparing a restoration matrix material at the same time; s2, threat level weight distribution and comprehensive restoration base value coefficient establishment: based on the data collected in the step S1, dividing and distributing physical stress data and chemical stress data weights, and establishing a comprehensive restoration base value coefficient according to the distributed physical stress data and chemical stress data weight values; and S3, dynamically adjusting a formula and performing precise adaptive construction: performing formula adjustment and adaptive construction on the repair base value material prepared in the step S1 through the comprehensive repair base value coefficient obtained in the step S2. According to the method, through field data acquisition and stress index construction, the repair prescription can be accurately matched with the specific stress type of the field, and accurate construction is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological restoration, in particular to a soil carbon fixation and restoration method for the freeze-thaw characteristics of plateau peatlands. BACKGROUND

[0002] Plateau peatlands are key carbon sinks in global carbon cycle, storing a large amount of organic carbon. However, such ecosystems are extremely sensitive to climate change and are facing severe degradation threats. In the plateau alpine environment, strong freeze-thaw cycles are the main physical stress leading to peatland degradation. On the one hand, the high water content in the soil generates a large frost heaving force when frozen in winter, which destroys the soil aggregate structure. After thawing in summer, the soil with destroyed structure will experience thaw settlement, compaction and water and soil loss, resulting in a sharp decline in physical structure stability.

[0003] On the other hand, the physical degradation caused by freeze-thaw cycles further exacerbates chemical and biological stress. When the frozen soil thaws, a large amount of active organic carbon that was previously sealed by ice is exposed to microorganisms. Under suitable pH and temperature, microbial activity is rapidly activated, leading to rapid decomposition of organic carbon and massive release in the form of carbon dioxide and methane, i.e., post-thaw carbon burst. This makes the degraded peatland change from a carbon sink to a carbon source.

[0004] Current restoration techniques for plateau peatlands often struggle to address the dual and conflicting challenges of physical stress and chemical stress. Existing restoration methods often use a one-size-fits-all approach, such as focusing only on vegetation restoration or single physical damming, without precise diagnosis of the specific stress type at the construction site. This approach fails to recognize that in some locations, the main problem may be the collapse of physical structure, while in other locations, it may be the risk of chemical carbon burst. Therefore, the existing technology generally lacks a mechanism that can dynamically feedback on-site data and precisely adjust the restoration formula, resulting in poor restoration effect and difficulty in long-term maintenance, and failing to solve the dual goals of physical stability and chemical carbon fixation. SUMMARY

[0005] To overcome the shortcomings of the prior art, the present application provides a soil carbon fixation and restoration method for the freeze-thaw characteristics of plateau peatlands, which solves the problem that the existing restoration technology cannot accurately diagnose the on-site stress type and dynamically adjust the formula, making it difficult to simultaneously address the two conflicting restoration problems of physical frost heaving damage and chemical carbon burst.

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: a soil carbon fixation and restoration method for the freeze-thaw characteristics of plateau peatlands, comprising the following steps: S1, field data collection and raw material preparation: collecting highland peat construction site data through collection tools, and based on the collected highland peat construction site data, dividing into physical stress data and chemical stress data, and preparing repair matrix materials at the same time; S2, threat level weight distribution and establishment of comprehensive repair base value coefficient: based on the physical stress data and chemical stress data collected in step S1, scene division is carried out, and the weight of the physical stress data and the chemical stress data is distributed according to the scene division, and then the comprehensive repair base value coefficient is established according to the weight value of the distributed physical stress data and chemical stress data; The comprehensive repair base value coefficient is established according to the weight value, which comprises: Among them: represents the comprehensive repair base value coefficient; represents the weight of physical stress data, and the value is 0.9, 0.3, or 0.5; represents the weight of chemical stress data, and the value is 0.1, 0.7, or 0.5; The scene division is considering that the soil with freeze-thaw characteristics of highland peat has different physical stress data and chemical stress data values in the process of carbon fixation repair. Through subsequent steps, and based on the comprehensive repair base value coefficient, different proportions of repair matrix materials are used for the actual physical stress data and chemical stress data values on site, so as to realize the effect of targeted and accurate repair, and the scene division includes: physical stress dominant scene, chemical stress dominant scene and mixed stress dominant scene. S3, dynamic adjustment of formula and precise adaptation of construction: based on the comprehensive repair base value coefficient obtained in step S2, the repair base value material prepared in step S1 is adjusted and adapted to realize dynamic formula adjustment and precise adaptation of construction.

[0007] Preferably, in step S1, the collection tool comprises a TDR probe, a simple permeameter, a potassium permanganate oxidation method field speed measuring box and a portable pH meter; the physical stress data comprises volume water content and soil structure stability; and the chemical stress data comprises active organic carbon and soil pH value.

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

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

[0010] Preferably, in step S3, comprising: S301, formula adjustment based on comprehensive repair base value coefficient: according to the comprehensive repair base value coefficient determined in step S2 and the calibration constant obtained by calibration experiment, the real-time glycerol and tannic acid formula adjustment ratio in A liquid repair fluid is calculated; S302, adaptation construction: according to the glycerol and tannic acid formula adjustment ratio adjusted in step S301, A liquid repair fluid is prepared, and B liquid catalyst liquid is prepared at the same time; S303, construction process: through the process, the A liquid repair fluid and B liquid catalyst liquid prepared in step S302 are applied to the target soil.

[0011] Preferably, in step S303, the process comprises: Matrix layout: according to the formula adjustment ratio in step S302, A liquid repair fluid is prepared, and B liquid catalyst liquid is prepared at the same time, and then they are respectively introduced into two independent non-corrosive containers equipped with high-pressure injection pumps and injection pipelines for temporary storage in the construction site; Two-step injection: two-step sequential injection with a specific time interval is performed to ensure effective distribution of components in the soil: First step, using a high-pressure injection pump through an injection pipeline, A liquid repair fluid stored in a polyethylene storage tank is injected into the surface layer of peat soil to be repaired according to a predetermined grid; Second step, after a predetermined penetration time, the A liquid repair fluid is fully dispersed in the soil pores, and then B liquid catalyst liquid stored in a polyethylene storage tank is injected into the same soil area in the first step through the original injection hole; In-situ crosslinking reaction: when the B liquid catalyst liquid injected in the second step contacts with the A liquid repair fluid already existing in the soil pores, the calcium lactate in the B liquid catalyst liquid releases Ions and sodium alginate in A liquid undergo in-situ ionic crosslinking reaction; Repair matrix formation: wait for 1-2 hours for in-situ ionic crosslinking reaction, so that A liquid repair fluid and B liquid catalyst liquid form a three-dimensional hydrogel network in the soil pores, at this time stop all mechanical disturbance to the construction area, so that the gel is fully cured, and finally the repair matrix is formed.

[0012] Preferably, in the matrix layout, the non-corrosive container preferably comprises a polyethylene storage tank; in the two-step injection, the predetermined grid is 1mx1m-2mx2m grid; the predetermined penetration time is 30-60 minutes.

[0013] The application of a soil carbon fixation and restoration method for the freezing and thawing characteristics of plateau peat land is applied to the field of ecological restoration, especially the field of ecological restoration of degraded peat wetlands on plateaus.

[0014] The application provides a soil carbon fixation and restoration method for the freezing and thawing characteristics of plateau peat land. 1、The application can quantitatively diagnose whether the main contradiction of the field soil is physical stress or chemical stress through the field data collection and stress index construction in step S1, and dynamically adjusts the formula regulation ratio of glycerol and tannic acid in the A liquid restoration fluid, so that the restoration prescription can accurately match the specific stress type of the field, and realizes adaptive and accurate construction from diagnosis to prescription.

[0015] 2、The application compounds glycerol for responding to physical stress and tannic acid for responding to chemical stress in the same A liquid restoration fluid, and encapsulates both in a three-dimensional hydrogel network through in-situ cross-linking reaction in step S303, which solves the problem of mutual conflict of physical stress and chemical stress restoration targets, and finds a balance point through the quantitative regulation in step S301. The final formed restoration matrix can simultaneously play the dual functions of flexible anti-freezing and carbon release inhibition, and realizes synergistic effect.

[0016] 3、The application adopts a two-step method of A liquid restoration fluid penetration and B liquid catalyst liquid catalysis, which makes the A liquid restoration fluid and the B liquid catalyst liquid in-situ cross-linking reaction in the soil pore, and the formed gel network can anchor the loose peat particles, realize the minimally invasive reinforcement of the soil structure, and more importantly, the in-situ formed matrix can long-term encapsulate the dynamically prepared glycerol and tannic acid in step S302 in the soil microenvironment, slows down the loss of functional components, and thus ensures the accurate and long-term restoration of the plateau freezing and thawing stress. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The process flowchart of the application is shown in the figure; Figure 2 The process flowchart of step S3 in the application is shown in the figure. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the specification of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0019] Please refer to the drawings in the specification of the application Figure 1 - the drawings in the specification of the application Figure 2The embodiment of the present application provides a soil carbon sequestration repair method for plateau peat freeze-thaw characteristics, comprising the following steps: S1, field data collection and raw material preparation: collecting the plateau peat construction site data through a collection tool, and based on the collected construction site data, dividing into physical stress data and chemical stress data, and preparing a repair matrix material; The collection tool comprises a TDR probe, a simple permeameter, a potassium permanganate oxidation method field speed measuring box and a portable pH meter; The data of the plateau peat construction site comprises physical stress data and chemical stress data; The physical stress data comprises volume water content and soil structure stability; The chemical stress data comprises active organic carbon and soil pH value; The collection mode comprises: First, randomly arrange not less than 5 sampling points in the plateau peat construction site area to be repaired, so as to ensure that the collected data can represent the average stress condition of the land; At each sampling point, the metal waveguide rod of the TDR probe is vertically and completely inserted into the surface layer soil of the peat to be repaired, and the insertion depth is 15 cm or 30 cm, so as to realize the collection of volume water content data; Near each sampling point, the cutting ring or the permeameter disc is lightly pressed into the surface layer of the soil, so as to realize the collection of the saturated hydraulic conductivity or the steady infiltration rate of the soil structure stability; At each sampling point, the surface layer soil sample is collected by using the soil drill, the soil samples of the 5 sampling points are mixed in equal amounts to form a mixed soil sample of the construction site, and the active organic carbon content is calculated by using the potassium permanganate oxidation method field speed measuring box; At each sampling point, a certain mass of soil sample is weighed, mixed with deionized water in a clean beaker according to a solid-liquid ratio of 1:2.5, and the portable pH meter is inserted into the supernatant or the slurry to read the stable soil pH value; The repair matrix material comprises a combination of A liquid repair fluid and B liquid catalyst liquid, the A liquid repair fluid specifically comprises sodium alginate 1.0%-3.0%, dynamic proportion repair agent 97%-99%, and water makes up the balance; the B liquid catalyst liquid specifically comprises calcium lactate 2.0%-5.0% and water makes up the balance, and the dynamic proportion repair agent comprises glycerol and tannic acid, and the ratio of glycerol to tannic acid is 1:0.56-11.7; S2, threat level weight allocation and establishment of comprehensive repair base value coefficient: based on the physical stress data and chemical stress data collected in step S1, scene division is performed, and the weight of the physical stress data and the chemical stress data is allocated according to the scene division, and then the comprehensive repair base value coefficient is established according to the weight value of the allocated physical stress data and the chemical stress data. The scene division is considering that the soil with freeze-thaw characteristics of the plateau peatland has different physical stress data and chemical stress data values in the process of carbon sequestration repair. Through subsequent steps, and based on the comprehensive repair base value coefficient, different proportions of repair substrate materials are used for the actual physical stress data and chemical stress data values on site to achieve the effect of targeted and precise repair. The scene division and the allocation of the weight of the physical stress data and the chemical stress data according to the scene division include: Physical stress dominant scene: The collected plateau peatland construction site data is: The volume water content is greater than 80%, which represents that the current construction soil is close to saturation, and the frost heaving force is extremely large; The soil structure stability is less than 3, which represents that the current construction soil structure is extremely poor and is prone to thawing and sinking; The soil pH value is less than 4.5, which represents that the current construction soil is too acidic and the microbial activity is inhibited Then it is judged that the main contradiction of the current soil repair is frost heaving and thawing and sinking, and the risk of microbial explosion is low, and the weight allocation is: physical stress data = 0.9, chemical stress data = 0.1; Chemical stress dominant scene: The collected plateau peatland construction site data is: The volume water content is less than 60%, which represents that the current construction soil frost heaving force is controllable; The soil structure stability is greater than 5, which represents that the current construction soil structure is relatively stable; The active organic carbon is greater than 1000mg / kg, which represents that the current construction soil has sufficient microbial food; 4.5 < soil pH < 6.0, which represents that the current construction soil pH is in the best interval for microbial activity; Then it is judged that the main contradiction of the current soil repair is carbon explosion after thawing, and the risk of physical damage is controllable, and the weight allocation is: physical stress data = 0.3, chemical stress data = 0.7; Mixed stress dominant scene: When the collected plateau peatland construction site data does not meet the specific combination of the above physical stress dominant scene or chemical stress dominant scene, including: The volume water content is greater than 80% and the active organic carbon is greater than 1000mg / kg; If the soil repair is mainly physical and biochemical risks, the weight distribution is: physical stress data = 0.5, chemical stress data = 0.5; According to the weight value, the comprehensive repair base value coefficient is established, including: Among them: represents the comprehensive repair base value coefficient; represents the physical stress data weight, taking 0.9, 0.3, or 0.5; represents the chemical stress data weight, taking 0.1, 0.7, or 0.5; S3, dynamically adjusting the formula and precisely adapting the construction: the comprehensive repair base value coefficient obtained by step S2 is used to adjust the formula and adapt the construction of the repair base value material prepared in step S1, to realize dynamic formula adjustment and precise adaptation construction, including: S301, formula adjustment based on the comprehensive repair base value coefficient: according to the comprehensive repair base value coefficient determined in step S2 and the calibration constant obtained by calibration experiment, the real-time glycerol and tannic acid formula adjustment ratio in A liquid repair fluid is calculated; the relationship between formula adjustment ratio and comprehensive repair base value coefficient follows the following formula: Among them: represents the formula condition ratio; G represents the added mass of glycerol in A liquid; T represents the added mass of tannic acid in A liquid; represents the comprehensive repair base value coefficient; represents the calibration constant, the value range of the calibration constant is 0.5≤C≤1.5, and the calibration constant is obtained by calibration experiment, including: The calibration experiment is determined by laboratory stress and response calibration experiment on typical soil samples of target plateau peat land, including: S-C1, analysis of reference soil sample and determination of reference comprehensive repair base value coefficient: Take a representative soil sample of plateau peat land.

[0020] Use the collection tool in S1 to measure the volume moisture content, soil structure index, active organic carbon and soil pH value of the reference soil sample.

[0021] According to the weight distribution rule in S2, the reference physical stress data weight and the reference chemical stress data weight of the reference soil sample are determined, and the comprehensive repair base value coefficient is calculated.

[0022] (For example, a typical mixed stress soil sample, the benchmark integrated repair base value coefficient = 1.0) S-C2, Preparation of Gradient FRR Repair Matrix: The benchmark soil sample is divided into several groups, such as groups A, B, C, D, and E.

[0023] Prepare multiple sets of A liquid repair fluid, with a constant sodium alginate concentration such as 2%, but the formula adjustment ratio in the A liquid is adjusted according to a preset gradient to cover the potential range of 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 B liquid with a constant concentration such as 3% calcium lactate. S-C3, Sample processing and freeze-thaw stress simulation: Apply A liquid and B liquid with different formula adjustment ratios in S-C2 to the benchmark soil sample groups in S-C1 respectively, to form in-situ gelation of the repaired soil samples.

[0025] Place all the treated soil sample groups in a programmable high-low temperature alternating test box 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, which is 1 cycle, a total of 10 cycles.

[0027] S-C4, Double evaluation of repair effect: After the standardized freeze-thaw cycle stress simulation, evaluate the repair effect of each group of soil samples in both physical and chemical dimensions: Physical repair effect evaluation: Determine the soil structure stability of each group of soil samples after freezing and thawing. The higher the SSI value, the better the physical repair effect.

[0028] Chemical repair effect evaluation: Place each group of soil samples in a constant temperature incubator, such as 15°C, and use gas chromatography or infrared gas analyzer to measure the 48-hour cumulative greenhouse gas release of each group of soil samples. The lower the release, the better the chemical repair effect. S-C5, Determination of Optimal Ratio Formula Adjustment Ratio: Analyze the data of S-C4, as the optimization goals of physics and chemistry are opposite, a comprehensive optimal solution needs to be found.

[0029] Establish a comprehensive evaluation function , for example, use the normalized weighted scoring method to find the 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 instruction: immediately press Prepare A liquid repair fluid, i.e. the added mass of glycerol in A liquid is 11.7 times that of tannic acid; When S2 judges that the chemical stress dominant scenario, the field staff calculates the formula adjustment ratio according to the formula: Construction instruction: immediately press formula adjustment ratio = 0.56 Prepare A liquid repair fluid, i.e. the added mass of glycerol in A liquid is 0.56 times that of tannic acid; When S2 judges that the mixed stress dominant scenario, the field staff calculates the formula adjustment ratio according to the formula: Construction instruction: immediately press formula adjustment ratio = 1.3 Prepare A liquid repair fluid, i.e. the added mass of glycerol in A liquid is 1.3 times that of tannic acid; S303, construction process: through the process flow, the A liquid repair fluid dynamically prepared in step S302 and the B liquid catalyst liquid are applied to the target soil, including: Matrix layout: the A liquid repair fluid prepared according to the formula adjustment ratio of step S302 and the B liquid catalyst liquid prepared at the same time are respectively introduced into two independent non-corrosive containers equipped with high-pressure injection pumps and injection pipelines for temporary storage in the construction site; the non-corrosive container preferably includes: polyethylene storage tank Two-step injection: perform two-step sequential injection with a specific time interval to ensure effective distribution of components in the soil: First, use a high-pressure injection pump to inject the A liquid repair fluid stored in the polyethylene storage tank into the surface layer of the peat soil to be repaired according to the predetermined grid, including: 1mx1m; Second, give the A liquid repair fluid a predetermined soaking time, and after it is fully dispersed in the soil pores, inject the B liquid catalyst liquid stored in the polyethylene storage tank into the same soil area in the first step through the original injection hole, the predetermined soaking time including: 30-60 minutes; In-situ cross-linking reaction: when the B liquid catalyst liquid injected in the second step contacts the A liquid repair fluid already present in the soil pores, the calcium lactate in the B liquid catalyst liquid releases ions and the sodium alginate in the A liquid undergo in-situ ionic cross-linking reaction; Repair matrix formation: Wait for 1-2 hours for in-situ ion cross-linking reaction, so that the A liquid repair fluid and the B liquid catalyst liquid form a three-dimensional hydrogel network in the soil pores at this time, stop all mechanical disturbance to the construction area, and allow the gel to fully solidify, and finally form a repair matrix, which re-anchors loose peat particles through a three-dimensional hydrogel network, and co-seals glycerol and tannic acid with a specific formula adjustment ratio in the A liquid repair fluid in the soil aggregate microenvironment, thereby achieving precise and long-term repair of specific stress identified in step S2.

[0031] Example one: The embodiment of the present application provides a soil carbon sequestration repair method for the freeze-thaw characteristics of plateau peat land, comprising the following steps: S1, field data collection and raw material preparation At a certain plateau peat land construction site, the staff uses collection tools to collect data at 5 random sampling points, and the average values are as follows: Volume water content: 85%, soil structure stability: 2, active organic carbon: 700 mg / kg, soil pH value: 4.2; At the same time, prepare the repair matrix material: A liquid repair fluid: sodium alginate, glycerol, tannic acid, water; and B liquid catalyst liquid: calcium lactate, water; S2, threat level weight distribution and establishment of comprehensive repair base value coefficient Based on the data in S1, meet the conditions of volume water content > 80%, soil structure stability < 3 and soil pH value < 4.5; Scene division: Determine that the main contradiction of the current soil repair is frost heaving and thawing settlement, and the risk of microbial explosion is low, which belongs to a physical stress dominated scene; Weight distribution: Physical stress data weight Chemical stress data weight ; Establish base value: According to the calculation example in S302, the comprehensive repair base value coefficient of this scene is ; S3, dynamic adjustment of formula and precise adaptation of construction: S301, formula adjustment based on the comprehensive repair base value coefficient: Assuming that through the calibration experiments of S-C1 to S-C6, the calibration constant of the construction site has been determined , the on-site staff calculates the formula adjustment ratio according to the formula: ; S302, adaptive construction: Construction instruction: immediately prepare A liquid repair fluid; A liquid repair fluid: sodium alginate 2.0%, dynamic proportion repair agent 98%, among which the mass of glycerol is 11.7 times the mass of tannic acid, and water makes up the balance; B liquid catalyst liquid: calcium lactate 3.0%, water makes up the balance; S303, the working process: Matrix laying: The prepared A and B solutions are respectively introduced into two independent polyethylene material storage tanks. Two-step perfusion: In the first step, a high-pressure perfusion pump is used to inject the A solution repair fluid into the surface layer of the peat soil to be repaired according to a predetermined grid of 1mx1m. In the second step, 45 minutes are waited for the A solution to fully penetrate. Subsequently, the B solution trigger liquid is injected into the same soil area through the original perfusion hole site. Repair matrix formation: Stop all mechanical disturbance and wait for the in-situ cross-linking reaction for 1.5 hours to form a three-dimensional hydrogel network of the A and B solutions in the soil pores, completing the repair.

[0032] The beneficial effects of Example One: This example is aimed at scenarios dominated by physical stress. The main contradiction is the extreme frost heaving damage and thaw settlement risk. This formula precisely strengthens the physical protection, effectively buffers the huge ice crystal expansion stress generated by high water content soil when frozen, and greatly reduces the frost heaving damage. At the same time, the gel network enhances the overall structure of the soil, effectively preventing the thaw settlement collapse after thawing. This method realizes the maximum repair of physical structure stability with the minimum chemical intervention cost.

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

Claims

1. A soil carbon sequestration remediation method for plateau peatland freeze-thaw characteristics, characterized in that, The method comprises the following steps: S1, field data collection and raw material preparation: collecting data of the construction site of the plateau peatland through a collection tool, and dividing the collected data of the construction site of the plateau peatland into physical stress data and chemical stress data, and preparing a repair matrix material; S2, threat level weight distribution and establishment of a comprehensive repair base value coefficient: based on the physical stress data and the chemical stress data collected in step S1, the scene is divided, and the weight of the physical stress data and the chemical stress data is distributed according to the scene division, and then the comprehensive repair base value coefficient is established according to the weight value of the distributed physical stress data and the chemical stress data; S3, dynamic adjustment of formula and precise adaptation of construction: based on the comprehensive repair base value coefficient obtained in step S2, the repair base value material prepared in step S1 is adjusted and adapted to realize dynamic formula adjustment and precise adaptation of construction.

2. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 1, characterized in that, In step S1, the collection tool comprises a TDR probe, a simple permeameter, a potassium permanganate oxidation method field speed measuring box and a portable pH meter; the physical stress data comprises volume water content and soil structure stability; and the chemical stress data comprises active organic carbon and soil pH value.

3. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 1, characterized in that, In step S1, the repair matrix material comprises a combination of A liquid repair fluid and B liquid catalyst liquid, the A liquid repair fluid specifically comprises 1.0%-3.0% sodium alginate, 97%-99% dynamic proportion repair agent, and the balance is water; and the B liquid catalyst liquid specifically comprises 2.0%-5.0% calcium lactate, and the balance is water.

4. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 3, characterized in that, The dynamic proportion repair agent comprises glycerol and tannic acid, and the ratio of the glycerol to the tannic acid is 1: (0.56-11.7).

5. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 1, characterized in that, In step S3, the following steps are included: S301, formula adjustment based on the comprehensive repair base value coefficient: based on the comprehensive repair base value coefficient determined in step S2 and the calibration constant obtained from the calibration experiment, the real-time glycerol and tannic acid formula adjustment ratio in the A liquid repair fluid is calculated; S302, adaptation of construction: the A liquid repair fluid is prepared according to the glycerol and tannic acid formula adjustment ratio adjusted in step S301, and the B liquid catalyst liquid is prepared at the same time; S303, construction process: the A liquid repair fluid and the B liquid catalyst liquid prepared in step S302 are applied to the target soil through a process flow.

6. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 5, characterized in that, In step S303, the process flow comprises: Matrix layout: the A liquid repair fluid prepared according to the formula adjustment ratio in step S302 and the B liquid catalyst liquid prepared at the same time are respectively introduced into two independent non-corrosive containers provided with high-pressure injection pumps and injection pipelines in the construction site for temporary storage; Two-step injection: a two-step sequential injection with a specific time interval is performed to ensure effective distribution of the components in the soil: First step: the A liquid repair fluid stored in the polyethylene storage tank is injected into the surface soil of the peatland to be repaired through the injection pipeline by using the high-pressure injection pump according to the predetermined grid; Second step: after a predetermined penetration time of the A liquid repair fluid is given to ensure that the A liquid repair fluid is fully dispersed in the soil pores, the B liquid catalyst liquid stored in the polyethylene storage tank is injected into the same soil area in the first step through the original injection hole. In-situ cross-linking reaction: When the post-injected B-liquid trigger liquid comes into contact with the A-liquid remediation fluid already present in the soil pores, the calcium lactate released from the B-liquid trigger liquid undergoes an in-situ ionic cross-linking reaction with the sodium alginate in the A-liquid ions Repair matrix formation: wait for 1-2 hours for in-situ ion cross-linking reaction, so that A liquid repair fluid and B liquid catalyzed liquid form a three-dimensional hydrogel network in soil pores, at which time all mechanical disturbances to the construction area are stopped, allowing the gel to fully solidify, and finally forming a repair matrix.

7. The soil carbon sequestration restoration method for plateau peatland freeze-thaw characteristics according to claim 6, characterized in that, In the matrix arrangement, the non-corrosive container preferably comprises a polyethylene material storage tank; in the two-step pouring, the predetermined grid is 1mx1m-2mx2m grid; the predetermined infiltration time is 30-60 minutes.

8. The use of a method for soil carbon sequestration remediation against the freeze-thaw characteristics of plateau peatlands, as claimed in any one of claims 1 to 7, characterized in that, It is applied to the field of ecological restoration, especially the field of ecological restoration of degraded peat wetlands on the plateau. It is applied to the field of ecological restoration, especially the field of ecological restoration of degraded peat wetlands on the plateau.

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