Method and device for determining suitable threshold for basin vegetation restoration

Abstract

The present invention relates to the technical field of basin vegetation restoration, and discloses a method and device for determining the appropriate threshold for basin vegetation restoration. The method includes: obtaining the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the basin vegetation restoration plan; wherein, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total carbon emission reduction of water energy, the total carbon sequestration of vegetation, and the total carbon sequestration of karst; constructing a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; wherein, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints; solving the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration. The present invention can quickly and reliably calculate the appropriate scale of basin vegetation construction, provide scientific and technological support for basin water-carbon resource simulation, evaluation and regulation, and vegetation construction planning, and is of great significance for the realization of the "dual carbon" goal.

Description

Technical Field

[0001] The present invention relates to the technical field of watershed vegetation restoration, and in particular to a method and device for determining a suitable threshold value for watershed vegetation restoration. Background Art

[0002] Basin vegetation construction directly affects basin vegetation carbon sinks, and also indirectly affects karst carbon sinks and hydropower generation by changing basin runoff, thereby affecting the emission reduction benefits of clean energy.

[0003] The method for determining the appropriate threshold of basin vegetation construction analyzes the relationship between vegetation and water through model simulation, statistical analysis, and case analysis to determine the appropriate threshold of basin vegetation construction. However, it does not consider regional water production and carbon fixation at the same time, nor does it unify the impact of vegetation construction on water production, that is, the method of unifying hydropower carbon emission reduction and vegetation carbon fixation into the carbon fixation target. This leads to inaccurate calculation of the appropriate scale of basin vegetation construction, which in turn affects the simulation, evaluation and regulation of basin water and carbon resources and vegetation construction planning. Summary of the invention

[0004] In view of this, the present invention provides a method for determining a suitable threshold for watershed vegetation restoration to solve the problem of inaccurate calculation of the appropriate scale of watershed vegetation construction, which in turn affects the simulation, evaluation and regulation of water and carbon resources in the watershed and the planning of vegetation construction.

[0005] In a first aspect, the present invention provides a method for determining a suitable threshold for watershed vegetation restoration, the method comprising:

[0006] Obtain the baseline carbon emission reduction corresponding to the basin baseline scenario plan in the target basin, and the carbon emission reduction caused by vegetation restoration corresponding to the basin vegetation restoration plan; the carbon emission reduction caused by vegetation restoration includes the total amount of hydropower carbon emission reduction, the total amount of vegetation carbon sequestration and the total amount of karst carbon sequestration;

[0007] The carbon sequestration objective function is constructed based on the baseline carbon sequestration emission reduction and the carbon sequestration emission reduction caused by vegetation restoration. The carbon sequestration objective function is constrained by natural constraints and vegetation restoration construction constraints.

[0008] The carbon sequestration objective function was solved to obtain the appropriate threshold for watershed vegetation restoration.

[0009] A method for determining the suitable threshold for watershed vegetation restoration provided in this embodiment obtains the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan in the target watershed, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan; constructs a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; solves the carbon sequestration objective function to obtain the suitable threshold for watershed vegetation restoration; from the perspective of carbon sequestration and emission reduction of vegetation construction, it unifies the two aspects that vegetation construction directly affects the runoff generation and concentration in the watershed, and indirectly affects the hydropower carbon emission reduction, karst carbon sequestration amount and directly changes the vegetation carbon sink into a single target that affects carbon sequestration and emission reduction, that is, unifies the hydropower carbon reduction effect, vegetation carbon sink, and karst carbon sink into an objective function, and at the same time considers natural constraints and vegetation restoration construction constraints, and solves the carbon sequestration objective function, which can quickly and reliably calculate the suitable scale of watershed vegetation construction, and provide scientific and technological support for watershed water-carbon resource simulation, evaluation and regulation, and vegetation construction planning.

[0010] In an alternative embodiment, obtaining the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan in the target watershed, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan includes:

[0011] Construct a water-carbon coupling model for the watershed terrestrial ecosystem;

[0012] Use the water-carbon coupling model of the watershed terrestrial ecosystem to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan;

[0013] Use the water-carbon coupling model of the watershed terrestrial ecosystem to calculate the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan.

[0014] A method for determining the suitable threshold for watershed vegetation restoration provided in this embodiment uses the water-carbon coupling model of the watershed terrestrial ecosystem to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan. From the perspective of carbon sequestration and emission reduction of vegetation construction, it unifies the two aspects that vegetation construction directly affects the runoff generation and concentration in the watershed, and indirectly affects the hydropower carbon emission reduction, karst carbon sequestration amount and directly changes the vegetation carbon sink into a single target that affects carbon sequestration and emission reduction. The baseline carbon sequestration and emission reduction amount provides a reference for the carbon sequestration and emission reduction effect of watershed vegetation restoration, lays a foundation for the construction of the subsequent carbon sequestration objective function, and provides scientific and technological support for watershed water-carbon resource simulation, evaluation and regulation, and vegetation construction planning.

[0015] In an alternative embodiment, using the water-carbon coupling model of the watershed terrestrial ecosystem to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan includes:

[0016] Use the water-carbon coupling model of the watershed terrestrial ecosystem to conduct a water cycle simulation on the watershed vegetation restoration plan to obtain the watershed runoff, actual evapotranspiration, groundwater runoff, surface runoff, and subsurface flow;

[0017] Obtain the water level drop of the river reaches in the target basin, and determine the total amount of water energy carbon emission reduction caused by vegetation restoration based on the basin runoff and the water level drop of the river reaches in the target basin;

[0018] Obtain the concentration of bicarbonate in the groundwater runoff, and determine the total amount of karst carbon sequestration caused by vegetation restoration based on the groundwater runoff, surface runoff, subsurface flow and bicarbonate concentration;

[0019] Establish a statistical model including the gross primary productivity of the basin ecosystem, ecosystem respiration, net ecosystem productivity and actual evapotranspiration based on the water use efficiency and water-carbon flux data;

[0020] Based on the actual evapotranspiration, use the statistical model to determine the total amount of vegetation carbon sequestration caused by vegetation restoration;

[0021] Calculate the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total amount of water energy carbon emission reduction, the total amount of vegetation carbon sequestration and the total amount of karst carbon sequestration.

[0022] A method for determining the appropriate threshold of basin vegetation restoration provided in this embodiment uses a water-carbon coupling model of the basin terrestrial ecosystem to simulate the water cycle of the basin vegetation restoration plan, realizes accurate simulation of the evaporation, infiltration and runoff processes of the basin ecosystem, and then determines the total amount of water energy carbon emission reduction and the total amount of karst carbon sequestration by simulating the basin runoff, reflecting the coupling process of water and carbon. Moreover, through a statistical model including the gross primary productivity of the basin ecosystem, ecosystem respiration, net ecosystem productivity and actual evapotranspiration, calculate the total amount of vegetation carbon sequestration caused by vegetation restoration, realize the calculation of the total amount of carbon sequestration caused by the vegetation itself, use the water-carbon coupling model of the basin terrestrial ecosystem to realize the accurate coupling simulation of water cycle elements and carbon cycle elements, realize the accurate calculation of the carbon sequestration and emission reduction effect evaluation indexes of basin vegetation restoration, namely the total amount of water energy carbon emission reduction, the total amount of vegetation carbon sequestration and the total amount of karst carbon sequestration, and improve the accuracy of the carbon sequestration and emission reduction amount caused by vegetation restoration.

[0023] In an alternative embodiment, calculate the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total amount of water energy carbon emission reduction, the total amount of vegetation carbon sequestration and the total amount of karst carbon sequestration; wherein, the calculation formula for the carbon sequestration and emission reduction amount caused by vegetation restoration is:

[0024]

[0025] Wherein, represents the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the th basin vegetation restoration plan, represents the total amount of water energy carbon emission reduction caused by vegetation restoration, represents the total amount of karst carbon sequestration caused by vegetation restoration, Represents the total carbon sequestration of vegetation caused by vegetation restoration, Represents the basin area.

[0026] In an alternative embodiment, a carbon sequestration objective function is constructed based on the baseline carbon emission reduction and the carbon emission reduction caused by vegetation restoration; wherein the expression of the carbon sequestration objective function is:

[0027]

[0028]

[0029] Wherein, Represents the carbon sequestration objective function, Represents the carbon emission reduction caused by vegetation restoration corresponding to the th basin vegetation restoration plan, Represents the baseline carbon emission reduction corresponding to the basin baseline scenario plan, Represents the soil moisture in the th basin vegetation restoration plan, Represents the soil moisture threshold, Represents the vegetation restoration construction scale corresponding to the basin vegetation restoration plan, Represents the maximum vegetation restoration construction scale.

[0030] In an alternative embodiment, the carbon sequestration objective function is solved to obtain the suitable threshold for basin vegetation restoration, including:

[0031] Using an intelligent optimization algorithm to solve the carbon sequestration objective function to obtain the suitable threshold for basin vegetation restoration.

[0032] The method for determining the suitable threshold for basin vegetation restoration provided in this embodiment uses an intelligent optimization algorithm to solve the carbon sequestration objective function, realizing the accurate calculation of the suitable threshold for basin vegetation construction and ensuring the optimality of the suitable threshold for basin vegetation restoration under different climate change scenarios.

[0033] In a second aspect, the present invention provides a device for determining the suitable threshold for basin vegetation restoration, and the device includes:

[0034] An acquisition module, configured to acquire the baseline carbon emission reduction corresponding to the basin baseline scenario plan in the target basin, and the carbon emission reduction caused by vegetation restoration corresponding to the basin vegetation restoration plan; wherein, the carbon emission reduction caused by vegetation restoration includes the total carbon emission reduction of water energy, the total carbon sequestration of vegetation, and the total carbon sequestration of karst.

[0035] A construction module, configured to construct a carbon sequestration objective function based on the baseline carbon emission reduction and the carbon emission reduction caused by vegetation restoration; wherein, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints;

[0036] A solution module for solving the carbon sequestration objective function to obtain the appropriate threshold for the restoration of basin vegetation.

[0037] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method for determining the appropriate threshold for the restoration of basin vegetation according to the first aspect or any corresponding embodiment thereof.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored. The computer instructions are used to cause a computer to execute the method for determining the appropriate threshold for the restoration of basin vegetation according to the first aspect or any corresponding embodiment thereof.

[0039] In a fifth aspect, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the method for determining the appropriate threshold for the restoration of basin vegetation according to the first aspect or any corresponding embodiment thereof. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 is a flowchart of a method for determining the appropriate threshold for the restoration of basin vegetation according to an embodiment of the present invention;

[0042] Figure 2 is a flowchart of another method for determining the appropriate threshold for the restoration of basin vegetation according to an embodiment of the present invention;

[0043] Figure 3 is a schematic structural diagram of a water-carbon coupling model of a basin terrestrial ecosystem according to an embodiment of the present invention;

[0044] Figure 4 is a block diagram of the structure of a device for determining the appropriate threshold for the restoration of basin vegetation according to an embodiment of the present invention;

[0045] Figure 5 is a schematic hardware structure diagram of a computer device according to an embodiment of the present invention. Detailed Embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0047] Currently, the methods for determining the suitable threshold for watershed vegetation restoration mainly include model simulation method, statistical analysis method, and case analysis method.

[0048] Model simulation method: Use hydrological models (such as SWAT model, VIC model, etc.) for eco-hydrological simulation to evaluate the water supply and demand relationship after watershed vegetation restoration. The above hydrological models can simulate the hydrological processes under different vegetation covers, thereby calculating the suitable threshold for vegetation restoration. Based on remote sensing image data, combined with Geographic Information System (GIS) technology, estimate the actual evapotranspiration of natural vegetation in the watershed, and then propose calculation methods for the minimum and optimal ecological water requirements for vegetation restoration.

[0049] Statistical analysis method: Through long-term observational data, statistically analyze key indicators such as vegetation coverage, soil moisture, and rainfall in the watershed to identify the key thresholds for vegetation restoration. Use remote sensing monitoring means such as photochemical vegetation index, combined with ground survey data, to evaluate the vegetation restoration potential in different regions of the watershed and determine the suitable vegetation restoration threshold.

[0050] Case analysis method: Based on actual cases, summarize and refine the suitable threshold for watershed vegetation restoration by comparing the ecological effects under different vegetation restoration measures. This method can comprehensively consider various influencing factors such as topography, climate, and soil.

[0051] The above methods have some deficiencies, namely the limitations of the model simulation method: some hydrological models do not consider sufficiently at the ecological scale and fail to simulate in detail ecological processes such as vegetation growth, carbon and nitrogen accumulation, and their coupled interactions with hydrology. Most hydrological models can only simulate static vegetation and it is difficult to reflect the dynamic characteristics of vegetation changing over time and with the environment; the deficiencies of the statistical analysis method: the statistical analysis method highly depends on complete data at a long time scale, but in practice such data is often difficult to obtain or there are missing values. Analyzing solely from a single indicator such as soil water or vegetation coverage may make it difficult to comprehensively reflect the suitability of vegetation restoration; the limitations of the case analysis method: there are significant differences in natural conditions and socio-economic conditions among different basins, and the results of the case analysis method may be difficult to directly apply to other basins. Although the case analysis method can comprehensively consider various influencing factors, in actual operation, it may be difficult to achieve comprehensive and comprehensive due to difficulties in data acquisition or limited analysis means.

[0052] To solve the above technical problems, an embodiment of the present invention provides a method for determining a suitable threshold for watershed vegetation restoration. By unifying the objective functions of the water-energy carbon reduction effect, vegetation carbon sink, and karst carbon sink, and taking the vegetation restoration construction scale planned by policies and the soil water threshold of plants under water stress as constraint conditions, and optimizing through intelligent algorithms, a suitable threshold for watershed vegetation construction is obtained.

[0053] An embodiment of the present invention provides a method for determining a suitable threshold for watershed vegetation restoration. It should be noted that for the method for determining a suitable threshold for watershed vegetation restoration provided by the embodiment of the present invention, the execution subject can be a device for determining a suitable threshold for watershed vegetation restoration. This device for determining a suitable threshold for watershed vegetation restoration can be implemented as part or all of an electronic device through software, hardware, or a combination of software and hardware. Among them, the electronic device can be a server or a terminal. Among them, the server in the embodiments of the present application can be a single server or a server cluster composed of multiple servers. The terminal in the embodiments of the present application can be other intelligent hardware devices such as a smart phone, a personal computer, a tablet computer, a wearable device, and a smart robot. In the following method embodiments, the execution subject is taken as an electronic device for example to illustrate.

[0054] According to an embodiment of the present invention, an embodiment of a method for determining a suitable threshold for watershed vegetation restoration is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0055] In this embodiment, a method for determining a suitable threshold for watershed vegetation restoration is provided, which can be used in the above-mentioned electronic device. Figure 1It is a flowchart of a method for determining the appropriate threshold for watershed vegetation restoration according to an embodiment of the present invention. As Figure 1 shown, this process includes the following steps:

[0056] Step S101: Obtain the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target watershed, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan. Among them, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total carbon emission reduction of hydropower, the total carbon sequestration of vegetation, and the total carbon sequestration of karst.

[0057] Step S102: Construct a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration. Among them, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints.

[0058] Specifically, set the future climate change scenario, combine policy materials such as regional vegetation construction plans, and determine the policy constraint boundary of the regional vegetation construction scale (i.e., vegetation restoration construction constraint) and the soil moisture threshold at which plants in the study area are under water stress constraint, and set various vegetation restoration construction scales within the constraint range , calculate ; among them, as the soil moisture decreases, when the soil moisture restricts evapotranspiration, it will trigger plant water stress. Therefore, define a key soil moisture threshold ( ), and relevant research shows that the global average value is , in arid ecosystems is , in humid ecosystems is .

[0059] Furthermore, the expression of the carbon sequestration objective function is:

[0060] (1)

[0061] (2)

[0062] Among them, represents the carbon sequestration objective function, represents the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the th watershed vegetation restoration plan, represents the baseline carbon sequestration and emission reduction amount corresponding to the watershed baseline scenario plan, represents the soil moisture in the th watershed vegetation restoration plan, represents the soil moisture threshold, It represents the vegetation restoration construction scale corresponding to the basin vegetation restoration plan. It represents the maximum vegetation restoration construction scale.

[0063] Step S103: Solve the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration.

[0064] Specifically, use the intelligent optimization algorithm to solve the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration.

[0065] Furthermore, solve it through intelligent optimization algorithms such as PEST (a groundwater model parameter optimization method, whose core is to use the Marquardt-Levenberg algorithm to obtain the minimum value of the objective function, which is the difference function between the model calculated value and the actual observed value), PSO (Particle Swarm Optimization) to obtain the optimal solution. At this time, the corresponding is the appropriate value of the vegetation restoration construction scale under the climate change scenario.

[0066] A method for determining the appropriate threshold for basin vegetation restoration provided in this embodiment obtains the baseline carbon sequestration and emission reduction amount corresponding to the basin baseline scenario plan in the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the basin vegetation restoration plan; constructs a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; solves the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration; from the perspective of carbon sequestration and emission reduction of vegetation construction, unifies the two aspects that vegetation construction directly affects basin runoff generation and concentration and indirectly affects basin water energy carbon emission reduction, karst carbon sequestration amount, and directly changes vegetation carbon sink into a single goal of affecting carbon sequestration and emission reduction, that is, unifies the water energy carbon reduction effect, vegetation carbon sink, and karst carbon sink into an objective function, and at the same time considers natural constraints and vegetation restoration construction constraints, and solves the carbon sequestration objective function, which can quickly and reliably calculate the appropriate scale of basin vegetation construction, and provide scientific and technological support for basin water-carbon resource simulation, evaluation and regulation, and vegetation construction planning.

[0067] In this embodiment, a method for determining the appropriate threshold for basin vegetation restoration is provided, which can be used in the above-mentioned electronic device. Figure 2 It is a flowchart of a method for determining the appropriate threshold for basin vegetation restoration according to an embodiment of the present invention. As Figure 2 shown, the process includes the following steps:

[0068] Step S201: Obtain the baseline carbon sequestration and emission reduction amount corresponding to the basin baseline scenario plan in the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the basin vegetation restoration plan; among them, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total water energy carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount.

[0069] Specifically, the above step S201 includes:

[0070] Step S2011, constructing a water-carbon coupling model for the basin terrestrial ecosystem.

[0071] Specifically, the water-carbon coupling model for the basin terrestrial ecosystem can adopt models such as WaSSI (Water Supply Stress Index model, water supply and demand calculation model), DTVGM-CASACNP (bidirectional ecological hydrological coupling model), CHANGE (change model), RHESSys (regional hydrological ecological simulation system), CEVSA model (carbon exchange between vegetation, soil and atmosphere model, a biogeochemical model that simulates the carbon exchange between vegetation, soil and atmosphere based on processes such as plant photosynthesis and respiration and soil microbial activities), BEPS model (boreal ecosystem productivity simulator, a computer simulation system for simulating the carbon balance of terrestrial ecosystems), IBIS model (Input / Output Buffer Information Specification, a method for quickly and accurately modeling I / O BUFFER based on the V / I curve), CASA (Carnegie-Ames-Stanford approach, a process-based remote sensing model), VIP model (vegetation interface process model), etc.

[0072] Furthermore, as Figure 3 shown, collect data on basin meteorology, hydrology, vegetation, soil, remote sensing, etc., process and input them into the water-carbon coupling model for the basin terrestrial ecosystem, and calibrate and verify the key processes of water and carbon cycles such as basin runoff, evapotranspiration, and total ecosystem productivity. The water-carbon coupling simulation for the basin terrestrial ecosystem can be achieved by WaSSI. This model integrates a potential evapotranspiration model, a snowmelt model, and a Sacramento model, and fully considers key water-carbon elements such as terrain undulation, soil moisture, vegetation conditions, and water division, achieving good application results. The water-carbon coupling model for the basin terrestrial ecosystem includes two core modules of water cycle and carbon cycle. Using a method combining distributed and lumped approaches, rasterized remote sensing, vegetation, hydrology, soil, etc. data are input into the model, and water and carbon cycle elements such as surface runoff (RS), subsurface flow (RI), groundwater runoff (RG), evapotranspiration (ET), gross primary productivity of the ecosystem (GPP), ecosystem respiration (RE), and net ecosystem productivity (NEP) are simulated with hydrological response units as the basic calculation units.

[0073] Furthermore, by setting different leaf area indices and vegetation types, while ensuring that other inputs of the basin terrestrial ecosystem water-carbon coupling model remain unchanged, scenario simulations are carried out through the basin terrestrial ecosystem water-carbon coupling model, and a basin baseline scenario plan and a basin vegetation restoration plan are set.

[0074] Step S2012, use the basin terrestrial ecosystem water-carbon coupling model to calculate the carbon sequestration and emission reduction caused by vegetation restoration corresponding to the basin vegetation restoration plan.

[0075] In some alternative embodiments, the above step S2012 includes:

[0076] Step a1, use the basin terrestrial ecosystem water-carbon coupling model to conduct a water cycle simulation on the basin vegetation restoration plan to obtain the basin runoff, actual evapotranspiration, groundwater runoff, surface runoff, and subsurface flow.

[0077] Specifically, the water cycle simulation is the calculation basis of the carbon cycle module. The water cycle simulation is mainly used to simulate the evaporation, infiltration, and runoff processes of the basin ecosystem, including the evapotranspiration calculation process, soil moisture and infiltration calculation process, runoff calculation process, etc.; the carbon cycle module reflects the water-carbon coupling process. This module constructs relationships based on the water and carbon fluxes measured by the global flux network and uses methods such as empirical linear regression models to simulate the carbon gain and loss processes in the basin.

[0078] Furthermore, as Figure 3 shown, the Sacramento Hydrological Model (Sacramento Soil Moisture Accounting model, abbreviated as SAC model) is used to simulate the basin water cycle process, and main hydrological parameters such as actual evapotranspiration, surface runoff, subsurface flow, and groundwater runoff can be simulated; among them, considering the influence of soil moisture on evapotranspiration, the value is used as the evaporation potential input parameter of the SAC model; the water for actual evapotranspiration in the carbon cycle module comes from the upper soil and the bound water in the lower layer; at the same time, the soil parameters required by the SAC model can be estimated using soil texture data; among them, the SAC model is a lumped parameter type continuous operation deterministic model and a standard soil moisture content calculation model; the SAC model is based on the storage, infiltration, migration, and evapotranspiration characteristics of soil moisture, and uses a series of mathematical expressions with certain physical concepts to describe each process of runoff formation. The state variables in the model represent a relatively independent characteristic in the hydrological cycle, and the model parameters have clear physical meanings and can be derived based on basin characteristics, rainfall, and flow data.

[0079] Furthermore, use the basin terrestrial ecosystem water-carbon coupling model to conduct a water cycle simulation, simulate the basin runoff process, and calculate the basin runoff under the basin baseline scenario plan and the basin vegetation restoration plan to be respectively and ( being 1, 2, 3...), with the unit of cubic meters ( ), where the basin runoff includes groundwater runoff, surface runoff and interflow, and the actual evapotranspiration is determined according to the bound water of the upper soil and the lower soil.

[0080] Step a2: Obtain the water level drop of the river section in the target basin, and determine the total amount of carbon emission reduction of water energy caused by vegetation restoration based on the basin runoff and the water level drop of the river section in the target basin.

[0081] Specifically, the available power generation is directly estimated according to the water level drop of the river section in the basin or the river section of the hydropower station and the basin runoff. The calculation formula of the basin available power generation is as follows:

[0082] (3)

[0083] Wherein, represents the theoretical reserve of the basin water energy resources, that is, the basin available power generation, with the unit of kilowatt-hour ( ), represents the height of the water level drop of the river section, with the unit of meter (m), represents the basin runoff.

[0084] Furthermore, the basin runoff and water energy are coupled by using the water-carbon coupling model of the basin terrestrial ecosystem to obtain the total amount of carbon emission reduction of water energy. Among them, the change in the carbon emission reduction of water energy caused by the runoff change is calculated by using the grid average emission factor, that is, the total amount of carbon emission reduction of water energy caused by vegetation restoration. The calculation formula of the total amount of carbon emission reduction of water energy caused by vegetation restoration is as follows:

[0085] (4)

[0086] Wherein, is the total amount of carbon emission reduction of water energy caused by vegetation restoration, with the unit of 0.001 is the unit conversion coefficient, is the grid average emission factor, with the unit of , 。

[0087] Step a3: Obtain the bicarbonate concentration in the groundwater runoff, and determine the total amount of karst carbon sequestration caused by vegetation restoration based on the groundwater runoff, surface runoff, interflow and bicarbonate concentration.

[0088] Specifically, the groundwater runoff RGa under different vegetation restoration scale scenarios in the target basin is obtained by using the water-carbon coupling model of the basin terrestrial ecosystem. Based on this, the basin runoff modulus MRa is calculated to provide parameters for the calculation of karst carbon sink; among them, the calculation formula of the basin runoff modulus is as follows:

[0089] (5)

[0090] Among them, is the runoff modulus of the basin, with the unit of , represents the basin area, with the unit of .

[0091] Furthermore, rock weathering is mainly the weathering dissolution of carbonate rocks participated by carbonic acid. The weathering process equation is as follows:

[0092] (6)

[0093] (7)

[0094] Among them, represents bicarbonate, represents calcium carbonate, represents carbon dioxide, represents water, represents calcium ions, represents calcium magnesium carbonate, represents magnesium ions.

[0095] Furthermore, it can be seen from the above formula that only half of the generated by the dissolution of carbonate rocks comes from the atmosphere . By combining the concentration of in the groundwater runoff with the groundwater runoff data, the atmospheric CO2 sink generated by the karstification of carbonate rocks in the basin is calculated. Its calculation formula is as follows:

[0096] (8)

[0097] Among them, represents the karst carbon sink intensity (unit: ), that is, the total amount of karst carbon sequestration caused by vegetation restoration. 1 / 2 means that half of the carbon in the groundwater runoff comes from the atmosphere, represents the mass concentration of in the runoff water body (unit: ), is 's relative molecular mass 44, is 's relative molecular mass 100, and 0.031536 is the unit conversion coefficient.

[0098] Furthermore, the surface runoff, subsurface flow and karst carbon sink are coupled by using the water-carbon coupling model of the basin's terrestrial ecosystem.

[0099] Step a4, establish a statistical model including the gross primary productivity, ecosystem respiration, net ecosystem productivity and actual evapotranspiration of the watershed ecosystem based on the water use efficiency and water-carbon flux data.

[0100] Specifically, as Figure 3 shown, use the water cycle module in the water-carbon coupling model of the watershed terrestrial ecosystem to input the actual evapotranspiration simulated by the water cycle into the carbon cycle model to obtain the gross primary productivity and ecosystem respiration of the watershed ecosystem. Then, based on the water use efficiency theory and the water-carbon flux data of the global flux network, establish a statistical model of the gross primary productivity ( ), ecosystem respiration ( ), net ecosystem productivity ( ), and actual evapotranspiration ( ), and use the (unit: mm) simulated by the water-carbon coupling model of the watershed terrestrial ecosystem to calculate the , and of the watershed terrestrial ecosystem, and its unit is .

[0101] Step a5, based on the actual evapotranspiration, use the statistical model to determine the total amount of carbon sequestration by vegetation caused by vegetation restoration.

[0102] Specifically, the formula for calculating the gross primary productivity of the watershed ecosystem is as follows:

[0103] (9)

[0104] where represents the empirical parameter derived from the water-carbon flux data.

[0105] Furthermore, based on the gross primary productivity, calculate the ecosystem respiration of the watershed ecosystem. The formula for calculating the ecosystem respiration of the watershed ecosystem is as follows:

[0106] (10)

[0107] where and represent the empirical parameters derived from the water-carbon flux data.

[0108] Furthermore, based on the gross primary productivity and ecosystem respiration, calculate the total amount of carbon sequestration by vegetation caused by vegetation restoration. The formula for calculating the net ecosystem productivity (i.e., the total amount of carbon sequestration by vegetation caused by vegetation restoration) is as follows:

[0109] (11)

[0110] Step a6: Calculate the carbon sequestration and emission reduction caused by vegetation restoration based on the total amount of water energy carbon emission reduction, the total amount of vegetation carbon sequestration, and the total amount of karst carbon sequestration.

[0111] Specifically, the calculation formula for the carbon sequestration and emission reduction caused by vegetation restoration is:

[0112] (12)

[0113] Where represents the carbon sequestration and emission reduction caused by vegetation restoration corresponding to the vegetation restoration plan of the th basin, represents the total amount of water energy carbon emission reduction caused by vegetation restoration, represents the total amount of karst carbon sequestration caused by vegetation restoration, represents the total amount of vegetation carbon sequestration caused by vegetation restoration, represents the basin area, and 11 / 3 is the unit conversion coefficient.

[0114] Step S2013: Calculate the baseline carbon sequestration and emission reduction corresponding to the baseline scenario plan using the water-carbon coupling model of the basin's terrestrial ecosystem.

[0115] Specifically, when is 0, calculate the baseline carbon sequestration and emission reduction using the above steps a1 to a6.

[0116] Step S202: Construct a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction and the carbon sequestration and emission reduction caused by vegetation restoration; among them, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints. For details, please refer to Figure 1 Step S102 of the embodiment shown, which will not be elaborated here.

[0117] Step S203: Solve the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration. For details, please refer to Figure 1 Step S103 of the embodiment shown, which will not be elaborated here.

[0118] A method for determining the appropriate threshold for basin vegetation restoration provided by this embodiment uses the water-carbon coupling model of the basin's terrestrial ecosystem to calculate the carbon sequestration and emission reduction caused by vegetation restoration corresponding to the basin vegetation restoration plan. From the perspective of carbon sequestration and emission reduction in vegetation construction, it unifies the two aspects that vegetation construction directly affects basin runoff generation and confluence, thereby indirectly affecting basin water energy carbon emission reduction and karst carbon sequestration, and directly changing the vegetation carbon sink, into a single goal of affecting carbon sequestration and emission reduction. The baseline carbon sequestration and emission reduction provides a reference for the carbon sequestration and emission reduction effect of basin vegetation restoration, lays a foundation for the subsequent construction of the carbon sequestration objective function, and provides scientific and technological support for basin water-carbon resource simulation, evaluation and regulation, and vegetation construction planning.

[0119] In this embodiment, a device for determining the suitable threshold for watershed vegetation restoration is also provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0120] This embodiment provides a device for determining the suitable threshold for watershed vegetation restoration, as Figure 4 shown, including:

[0121] An acquisition module 401, configured to acquire the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target watershed, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan; wherein, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total carbon emission reduction of hydropower, the total carbon sequestration of vegetation, and the total carbon sequestration of karst.

[0122] A construction module 402, configured to construct a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; wherein, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints.

[0123] A solution module 403, configured to solve the carbon sequestration objective function to obtain the suitable threshold for watershed vegetation restoration.

[0124] In some alternative implementation manners, the acquisition module 401 includes:

[0125] A construction unit, configured to construct a water-carbon coupling model of the watershed terrestrial ecosystem.

[0126] A first calculation unit, configured to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the watershed vegetation restoration plan by using the water-carbon coupling model of the watershed terrestrial ecosystem.

[0127] A second calculation unit, configured to calculate the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan by using the water-carbon coupling model of the watershed terrestrial ecosystem.

[0128] In some alternative implementation manners, the first calculation unit includes:

[0129] A simulation subunit, configured to perform a water cycle simulation on the watershed vegetation restoration plan by using the water-carbon coupling model of the watershed terrestrial ecosystem to obtain the watershed runoff, actual evapotranspiration, groundwater runoff, surface runoff, and subsurface flow.

[0130] A first determination subunit, configured to obtain the water level drop of the river section of the target watershed, and determine the total carbon emission reduction of hydropower caused by vegetation restoration based on the watershed runoff and the water level drop of the river section of the target watershed.

[0131] A second determination subunit, configured to obtain the bicarbonate concentration in groundwater runoff, and determine the total amount of karst carbon sequestration caused by vegetation restoration based on the groundwater runoff, surface runoff, subsurface flow, and bicarbonate concentration;

[0132] A establishment subunit, configured to establish a statistical model including the gross primary productivity of the watershed ecosystem, ecosystem respiration, net ecosystem productivity, and actual evapotranspiration based on the water use efficiency and water-carbon flux data;

[0133] A third determination subunit, configured to determine the total amount of vegetation carbon sequestration caused by vegetation restoration based on the actual evapotranspiration using the statistical model;

[0134] A calculation subunit, configured to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total amount of water-energy-carbon emission reduction, total amount of vegetation carbon sequestration, and total amount of karst carbon sequestration.

[0135] In some alternative embodiments, the calculation formula for the carbon sequestration and emission reduction amount caused by vegetation restoration in the calculation subunit is:

[0136]

[0137] wherein, represents the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the th watershed vegetation restoration plan, represents the total amount of water-energy-carbon emission reduction caused by vegetation restoration, represents the total amount of karst carbon sequestration caused by vegetation restoration, represents the total amount of vegetation carbon sequestration caused by vegetation restoration, represents the watershed area.

[0138] In some alternative embodiments, the expression of the carbon sequestration objective function in the construction module 402 is:

[0139]

[0140]

[0141] wherein, represents the carbon sequestration objective function, represents the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the th watershed vegetation restoration plan, represents the baseline carbon sequestration and emission reduction amount corresponding to the watershed baseline scenario plan, represents the soil moisture in the th watershed vegetation restoration plan, represents the soil moisture threshold, represents the vegetation restoration construction scale corresponding to the watershed vegetation restoration plan, Indicates the maximum scale of vegetation restoration and construction.

[0142] In some alternative embodiments, the solving module 403 is specifically configured to solve the carbon sequestration objective function by using an intelligent optimization algorithm to obtain the appropriate threshold for watershed vegetation restoration.

[0143] The further functional descriptions of the above-mentioned various modules and units are the same as those in the corresponding embodiments above, and will not be elaborated here.

[0144] The device for determining the appropriate threshold for watershed vegetation restoration in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0145] The embodiment of the present invention also provides a computer device having the above-mentioned Figure 4 shown device for determining the appropriate threshold for watershed vegetation restoration.

[0146] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As Figure 5 shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including a high-speed interface and a low-speed interface. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (such as an array of servers, a set of blade servers, or a multi-processor system). Figure 5 One processor 10 is taken as an example in

[0147] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above-mentioned hardware chip can be an application specific integrated circuit, a programmable logic device, or a combination thereof. The above-mentioned programmable logic device can be a complex programmable logic device, a field programmable gate array, a general array logic, or any combination thereof.

[0148] Among them, the memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiments.

[0149] The memory 20 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 may optionally include a memory remotely provided with respect to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0150] The memory 20 may include a volatile memory, for example, a random access memory; the memory may also include a non-volatile memory, for example, a flash memory, a hard disk, or a solid-state drive; the memory 20 may further include a combination of the above types of memories.

[0151] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 may be connected through a bus or other means. Figure 5 Taking connection through a bus as an example.

[0152] The input device 30 can receive input digital or character information, and generate key signal inputs related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (for example, an LED), and a tactile feedback device (for example, a vibration motor), etc. The above display device includes but is not limited to a liquid crystal display, a light-emitting diode, a display, and a plasma display. In some alternative embodiments, the display device may be a touch screen.

[0153] Embodiments of the present invention also provide a computer-readable storage medium. The method according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code that is originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored as such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0154] A part of the present invention can be applied as a computer program product, for example, computer program instructions. When executed by a computer, through the operation of the computer, the methods and / or technical solutions according to the present invention can be invoked or provided. Those skilled in the art should be able to understand that the forms of existence of computer program instructions in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible by the computer.

[0155] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for determining the appropriate threshold for watershed vegetation restoration, characterized in that, The method includes: Obtaining the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin; wherein, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total hydropower carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount; Constructing a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; wherein, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints; Solving the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration; The obtaining of the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin includes: Constructing a water-carbon coupling model for the basin terrestrial ecosystem; Calculating the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin by using the water-carbon coupling model for the basin terrestrial ecosystem; Calculating the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the basin by using the water-carbon coupling model for the basin terrestrial ecosystem; The calculating of the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin by using the water-carbon coupling model for the basin terrestrial ecosystem includes: Performing a water cycle simulation on the vegetation restoration plan of the basin by using the water-carbon coupling model for the basin terrestrial ecosystem to obtain the basin runoff, actual evapotranspiration, groundwater runoff, surface runoff, and subsurface flow; Obtaining the water level drop of the river section in the target basin, and determining the total hydropower carbon emission reduction amount caused by vegetation restoration based on the basin runoff and the water level drop of the river section in the target basin; Obtaining the bicarbonate ion concentration in the groundwater runoff, and determining the total karst carbon sequestration amount caused by vegetation restoration based on the groundwater runoff, surface runoff, subsurface flow, and the bicarbonate ion concentration; Establishing a statistical model including the total primary productivity of the basin ecosystem, ecosystem respiration, net ecosystem productivity, and actual evapotranspiration based on the water use efficiency and water-carbon flux data; Determining the total vegetation carbon sequestration amount caused by vegetation restoration based on the actual evapotranspiration by using the statistical model; Calculating the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total hydropower carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount; Constructing a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; wherein the expression of the carbon sequestration objective function is: in, represents the carbon fixation objective function, Indicates Carbon sequestration reduction caused by vegetation restoration corresponding to each watershed vegetation restoration plan, represents the baseline carbon sequestration reduction corresponding to the basin baseline scenario, Indicates Soil moisture in the watershed vegetation restoration program, represents the soil moisture threshold, Indicates the scale of vegetation restoration construction corresponding to the watershed vegetation restoration plan, Indicates the maximum scale of vegetation restoration construction.

2. The method according to claim 1, characterized in that, Calculating the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total hydropower carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount; wherein, the calculation formula of the carbon sequestration and emission reduction amount caused by vegetation restoration is: Among them, represents the carbon sequestration and emission reduction caused by vegetation restoration corresponding to the th basin vegetation restoration plan, represents the total carbon emission reduction of water energy caused by vegetation restoration, represents the total amount of karst carbon sequestration caused by vegetation restoration, represents the total amount of vegetation carbon sequestration caused by vegetation restoration, represents the basin area.

3. The method according to claim 1, characterized in that, The solving of the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration includes: Solving the carbon sequestration objective function by using an intelligent optimization algorithm to obtain the appropriate threshold for basin vegetation restoration.

4. A device for determining a suitable threshold for watershed vegetation restoration, characterized in that, The device includes: An acquisition module, configured to acquire the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the target basin, and the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin; wherein, the carbon sequestration and emission reduction amount caused by vegetation restoration includes the total hydropower carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount; A construction module, configured to construct a carbon sequestration objective function based on the baseline carbon sequestration and emission reduction amount and the carbon sequestration and emission reduction amount caused by vegetation restoration; wherein, the carbon sequestration objective function is subject to natural constraints and vegetation restoration construction constraints; A solving module, configured to solve the carbon sequestration objective function to obtain the appropriate threshold for basin vegetation restoration; The acquisition module includes: A construction unit, configured to construct a water-carbon coupling model for the basin terrestrial ecosystem; A first calculation unit, configured to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration corresponding to the vegetation restoration plan of the basin by using the water-carbon coupling model of the basin terrestrial ecosystem; A second calculation unit, configured to calculate the baseline carbon sequestration and emission reduction amount corresponding to the baseline scenario plan of the basin by using the water-carbon coupling model of the basin terrestrial ecosystem; The first calculation unit includes: A simulation subunit, configured to perform a water cycle simulation on the vegetation restoration plan of the basin by using the water-carbon coupling model of the basin terrestrial ecosystem to obtain the basin runoff, actual evapotranspiration, groundwater runoff, surface runoff, and subsurface flow; A first determination subunit, configured to obtain the water level drop of the river section in the target basin, and determine the total hydropower carbon emission reduction amount caused by vegetation restoration based on the basin runoff and the water level drop of the river section in the target basin; A second determination subunit, configured to obtain the bicarbonate concentration in the groundwater runoff, and determine the total karst carbon sequestration amount caused by vegetation restoration based on the groundwater runoff, surface runoff, subsurface flow, and bicarbonate concentration; An establishment subunit, configured to establish a statistical model including the total primary productivity of the basin ecosystem, ecosystem respiration, net ecosystem productivity, and actual evapotranspiration based on the water use efficiency and water-carbon flux data; A third determination subunit, configured to determine the total vegetation carbon sequestration amount caused by vegetation restoration based on the actual evapotranspiration by using the statistical model; A calculation subunit, configured to calculate the carbon sequestration and emission reduction amount caused by vegetation restoration based on the total hydropower carbon emission reduction amount, the total vegetation carbon sequestration amount, and the total karst carbon sequestration amount; The expression of the carbon sequestration objective function in the construction module is: in, represents the carbon fixation objective function, Indicates Carbon sequestration reduction caused by vegetation restoration corresponding to each watershed vegetation restoration plan, represents the baseline carbon sequestration reduction corresponding to the basin baseline scenario, Indicates Soil moisture in the watershed vegetation restoration program, represents the soil moisture threshold, Indicates the scale of vegetation restoration construction corresponding to the watershed vegetation restoration plan, Indicates the maximum scale of vegetation restoration construction.

5. A computer device, characterized in that, including: A memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the method for determining the appropriate threshold for basin vegetation restoration according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a computer to execute the method for determining the appropriate threshold for basin vegetation restoration according to any one of claims 1 to 3.

7. A computer program product, characterized in that, including computer instructions, and the computer instructions are used to cause a computer to execute the method for determining the appropriate threshold for basin vegetation restoration according to any one of claims 1 to 3.

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