Method for constructing security pattern based on ecosystem health and service supply scarcity

Abstract

The application discloses a safety pattern construction method based on ecosystem health and service supply scarcity, and comprises the following steps: S1, constructing an ecological health evaluation system under the perspective of land-water-bay triple coupling; S2, using an InVEST model to simulate the ecosystem service supply amount of water yield, water quality purification and soil conservation, combining a CASA model to calculate the carbon storage amount, and statistically calculating demand data to construct an ecosystem service supply scarcity index; S3, integrating the ecological health comprehensive index and the ecosystem service supply scarcity index by using range standardization and entropy weight method to generate an ecological safety pattern; the method generates a three-stage progressive ecological safety pattern of 'ecological health diagnosis-supply scarcity early warning-ecological safety pattern identification' according to the water-land interaction characteristics of the bay city, and not only provides a basis for the ecological zoning management of the bay city, but also provides an important reference for the comprehensive ecological protection management of land-sea planning.

Description

Technical Field

[0001] This invention belongs to the field of ecological management technology, specifically relating to a method for constructing a security pattern based on the health of the ecosystem and the scarcity of service supply. Background Technology

[0002] Ecological security pattern assessment refers to the state in which an ecosystem maintains structural and functional stability at a specific spatiotemporal scale, provided it is free from threats from natural environmental conditions and socioeconomic pressures, and offers ecosystem services and environmental conditions necessary for human survival and development. Ecological security patterns can help identify and protect key ecological areas, maintain ecosystem stability and function, and better understand the impacts of natural factors and human activities on ecosystems. Furthermore, the construction of ecological security patterns provides quantitative support for ecological zoning management and safeguards the long-term health of ecosystems and the sustainable development of regions. However, in the practice of bay cities, traditional ecological security pattern assessments have limitations. They fail to fully reflect the impact of marine and urban aquatic ecosystems on the ecological security pattern, and there is still a lack of experience in constructing an ecological security pattern assessment index system that considers terrestrial, aquatic, and bay areas. This makes it difficult to conduct a comprehensive diagnosis of regional ecological security from multiple dimensions, and it also fails to consider the capacity for sustainable urban development. This often weakens the reliability of the assessment results and makes it difficult to meet practical needs. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a method for constructing a security pattern based on ecosystem health and the scarcity of service supply. This method, targeting the dynamic interaction characteristics of land-water-bay in bay cities, generates a three-stage progressive ecological security pattern: "ecological health diagnosis - supply scarcity early warning - ecological security pattern identification." This not only provides a basis for ecological zoning management in bay cities but also offers an important reference for integrated ecological protection and governance that coordinates land and sea.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The approach to constructing a security paradigm based on ecosystem health and service scarcity includes the following steps:

[0006] S1. Constructing an ecological health evaluation system from the perspective of land-water-bay triple coupling;

[0007] S2. Use the InVEST model to simulate the supply of ecosystem services such as water production, water purification and soil retention, combine it with the CASA model to calculate carbon storage, and collect demand data to construct an ecosystem service supply scarcity index.

[0008] S3. Integrate the comprehensive ecological health index and the ecosystem service supply scarcity index using range standardization and entropy weight method to generate an ecological security pattern.

[0009] Preferably, the specific process of step S1 is as follows:

[0010] S11. Terrestrial Ecological Health Assessment: Based on ecosystem vitality, ecosystem organization, and ecosystem resilience, vegetation productivity, landscape connectivity, and resistance to disturbance are quantified. Specifically, the CASA model is used to simulate net primary productivity of vegetation to quantify ecosystem vitality; landscape diversity, landscape aggregation, and landscape morphology are used to measure ecosystem organization; and the InVEST model is used to simulate habitat quality to represent ecosystem resilience. The formula for calculating terrestrial ecological health is as follows: Among them, TEH represents terrestrial ecological health; EV represents ecosystem vitality; EO represents ecosystem organization; and ER represents ecosystem resilience.

[0011] S12. Aquatic Ecological Health Assessment: For urban rivers, an evaluation index system is constructed from five dimensions: hydrology, water quality, aquatic ecology, morphological structure, and social function. For freshwater reservoirs and seawater lakes, a differentiated evaluation index system is constructed from four dimensions: water quality, biology, morphological structure, and social service function, based on differences in salinity gradients. The weight of each evaluation index is then determined through expert scoring to obtain the aquatic ecological health.

[0012] S13. Assessment of the health of the bay ecosystem: Based on relevant scholars’ assessment studies of the bay ecosystem and combined with the estuary cruise survey, five indices were obtained from the perspectives of water environment quality and community structure change: eutrophication index, dissolved oxygen standard index, benthic community diversity, benthic community richness and benthic community evenness. The spatial distribution of the health of the bay ecosystem was obtained by using the inverse distance weighted interpolation method in ArcGIS 10.5 software.

[0013] S14. Integrating the ecological health of multiple ecosystems across land, water, and bay areas, a holistic diagnosis of the ecological health of bay cities was achieved. The calculation formula is as follows: ,in, For the comprehensive index of ecological health; The BEH index is used for the ecological health of aquatic waters; the BEH index is used for the ecological health of bays. The BEH index is only included in the ecological health calculation of adjacent sea area administrative units.

[0014] Preferably, the specific process of step S2 is as follows:

[0015] S21. Calculate the supply-demand ratio of ecosystem services. The calculation formula is as follows: ,in, The supply-demand ratio for services to the t-th ecosystem; The needs of serving the t-th type of ecosystem; The supply of services for the t-th type of ecosystem;

[0016] S22. Based on the scarcity of ecosystem service supply approach, the total supply and demand of ecosystem services are represented by the priority of ecosystem service types. The calculation formula is as follows: , ,in, The total supply of ecosystem services for subregion r; The total demand for ecosystem services for subregion r; t is the ecosystem service type number; Total number of ecosystem service types; Prioritize the t-th type of ecosystem service in subregion r; The provision of the t-th type of ecosystem service in subregion r; The demand for the t-th type of ecosystem service in subregion r;

[0017] S23. Employ a urgency-based measure of regional differences and construct priorities using structural imbalances in ecosystem service types. The higher the overall imbalance level, the higher the imbalance level of ecosystem services, and the higher the priority of ecosystem services. The calculation formula is as follows: , , ,in, The urgency of subregion r; IBG r The overall imbalance level serving the total ecosystem of subregion r; The degree of imbalance of the t-th type of ecosystem service within subregion r;

[0018] S24. Construct an ecosystem service scarcity index using urgency and priority, calculated as follows: ,in, The scarcity index of ecosystem service supply within subregion r.

[0019] Preferably, the specific steps of step S3 are as follows:

[0020] S31. The two data points, the comprehensive ecological health index and the ecosystem service scarcity index, are standardized using the range method. The calculation formula is as follows: ,in, This represents the normalized value of the j-th indicator for the i-th sample. This represents the original value of the j-th indicator for the i-th sample; The j-th indicator is the minimum value among all samples; The j-th indicator is the maximum value among all samples;

[0021] S32. Calculate the entropy value of each indicator. The calculation formula is as follows: ,in, Let be the entropy value of the j-th index; Let i be the proportion of the i-th sample under the j-th indicator; is the entropy normalization coefficient; 'a' is the total number of samples;

[0022] S33. Calculate the information redundancy of each indicator. The calculation formula is as follows: ,in, The information entropy redundancy of the j-th indicator;

[0023] S34. Calculate the weight of each indicator. The calculation formula is as follows: ,in, Let be the weight of the j-th indicator; The total number of evaluation indicators;

[0024] S35. Generate a spatial distribution map of the ecological security pattern based on the weights of each indicator.

[0025] Preferably, the spatial distribution map of the ecological security pattern in step S35 is divided into high ecological security zone, medium ecological security zone and low ecological security zone, providing a basis for ecological zoning management.

[0026] After adopting the above technical solution, the present invention has the following beneficial effects: The present invention, targeting the dynamic interaction characteristics of land-water-bay in bay cities, generates a three-stage progressive ecological security pattern: "ecological health diagnosis - supply scarcity early warning - ecological security pattern identification." First, it proposes a multi-source integrated ecological health evaluation method involving the coupling of multiple ecosystems in the land, water, and bay areas. Land ecological health is based on ecosystem vitality, ecosystem organization, and ecosystem resilience, quantifying vegetation productivity, landscape connectivity, and resistance to disturbance. Water ecological health includes three aquatic ecosystems: urban rivers, freshwater reservoirs, and seawater lakes. Key indicators for urban river ecological health are selected from five aspects: hydrology, water quality, aquatic ecology, morphological structure, and social service functions. Differential indicator systems for freshwater reservoirs and seawater lakes are constructed from four dimensions: water quality, biology, morphological structure, and social service functions, based on differences in water salinity gradients. Bay ecological health integrates two dimensions: water environmental quality and community structure changes. Then, by combining range standardization and entropy weighting, the three subsystems are combined to form a comprehensive ecological health index to assess the local ecological health status. Secondly, an ecosystem service supply scarcity index is constructed using priority and urgency to identify areas with high ecological protection priorities, providing a quantitative basis for resource overload early warning. Finally, range standardization and entropy weighting are used to determine the weights of ecological health and ecosystem service supply scarcity, generating a human-land coupled ecological security pattern. This not only provides a basis for ecological zoning management in bay cities but also offers an important reference for integrated land-sea ecological protection and governance. Attached Figure Description

[0027] Figure 1This is a flowchart of the present invention;

[0028] Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] like Figure 1 and Figure 2 As shown, the method for constructing a security pattern based on ecosystem health and the scarcity of service supply includes the following steps:

[0031] S1. Constructing an ecological health evaluation system from the perspective of land-water-bay triple coupling;

[0032] The specific process of step S1 is as follows:

[0033] S11. Terrestrial Ecological Health Assessment: Based on ecosystem vitality, ecosystem organization, and ecosystem resilience, vegetation productivity, landscape connectivity, and resistance to disturbance are quantified. Specifically, the CASA model is used to simulate net primary productivity of vegetation to quantify ecosystem vitality; landscape diversity, landscape aggregation, and landscape morphology are used to measure ecosystem organization; and the InVEST model is used to simulate habitat quality to represent ecosystem resilience. The formula for calculating terrestrial ecological health is as follows: Among them, TEH represents terrestrial ecological health; EV represents ecosystem vitality; EO represents ecosystem organization; and ER represents ecosystem resilience.

[0034] S12. Aquatic Ecological Health Assessment: For urban rivers, an evaluation index system is constructed from five dimensions: hydrology, water quality, aquatic ecology, morphological structure, and social function. For freshwater reservoirs and seawater lakes, a differentiated evaluation index system is constructed from four dimensions: water quality, biology, morphological structure, and social service function, based on differences in salinity gradients. The weight of each evaluation index is then determined through expert scoring to obtain the aquatic ecological health.

[0035] S13. Assessment of the health of the bay ecosystem: Based on relevant scholars’ assessment studies of the bay ecosystem and combined with the estuary cruise survey, five indices were obtained from the perspectives of water environment quality and community structure change: eutrophication index, dissolved oxygen standard index, benthic community diversity, benthic community richness and benthic community evenness. The spatial distribution of the health of the bay ecosystem was obtained by using the inverse distance weighted interpolation method in ArcGIS 10.5 software.

[0036] S14. Integrating the ecological health of multiple ecosystems across land, water, and bay areas, a holistic diagnosis of the ecological health of bay cities was achieved. The calculation formula is as follows: ,in, For the comprehensive index of ecological health; The ecological health index is defined as follows: BEH (Bay Ecological Health) refers to the ecological health of the waters; BEH is only included in the ecological health calculation for adjacent sea administrative units. Table 1 shows the evaluation framework for the comprehensive ecological health index.

[0037] Table 1: Evaluation Framework of the Comprehensive Ecological Health Index

[0038]

[0039]

[0040] S2. Use the InVEST model to simulate the supply of ecosystem services such as water production, water purification and soil retention, combine it with the CASA model to calculate carbon storage, and collect demand data to construct an ecosystem service supply scarcity index.

[0041] The specific process of step S2 is as follows:

[0042] S21. Calculate the supply-demand ratio of ecosystem services. The calculation formula is as follows: ,in, The supply-demand ratio for services to the t-th ecosystem; The needs of serving the t-th type of ecosystem; The supply of services for the t-th type of ecosystem;

[0043] S22. Based on the scarcity of ecosystem service supply approach, the total supply and demand of ecosystem services are represented by the priority of ecosystem service types. The calculation formula is as follows: , ,in, The total supply of ecosystem services for subregion r; The total demand for ecosystem services for subregion r; t is the ecosystem service type number; Total number of ecosystem service types; Prioritize the t-th type of ecosystem service in subregion r; The provision of the t-th type of ecosystem service in subregion r; The demand for the t-th type of ecosystem service in subregion r;

[0044] S23. Employ a urgency-based measure of regional differences and construct priorities using structural imbalances in ecosystem service types. The higher the overall imbalance level, the higher the imbalance level of ecosystem services, and the higher the priority of ecosystem services. The calculation formula is as follows: , , ,in, The urgency of subregion r; IBG r The overall imbalance level serving the total ecosystem of subregion r; The degree of imbalance of the t-th type of ecosystem service within subregion r;

[0045] S24. Construct an ecosystem service scarcity index using urgency and priority, calculated as follows: ,in, The scarcity index of ecosystem service supply within subregion r;

[0046] S3. Integrate the comprehensive ecological health index and the ecosystem service supply scarcity index using range standardization and entropy weight method to generate an ecological security pattern;

[0047] The specific steps of step S3 are as follows:

[0048] S31. The two data points, the comprehensive ecological health index and the ecosystem service scarcity index, are standardized using the range method. The calculation formula is as follows: ,in, This represents the normalized value of the j-th indicator for the i-th sample. This represents the original value of the j-th indicator for the i-th sample; The j-th indicator is the minimum value among all samples; The j-th indicator is the maximum value among all samples;

[0049] S32. Calculate the entropy value of each indicator. The calculation formula is as follows: ,in, Let be the entropy value of the j-th index; Let i be the proportion of the i-th sample under the j-th indicator; is the entropy normalization coefficient; 'a' is the total number of samples;

[0050] S33. Calculate the information redundancy of each indicator. The calculation formula is as follows: ,in, The information entropy redundancy of the j-th indicator;

[0051] S34. Calculate the weight of each indicator. The calculation formula is as follows: ,in, Let be the weight of the j-th indicator; The total number of evaluation indicators;

[0052] S35. Generate a spatial distribution map of the ecological security pattern based on the weights of each indicator;

[0053] The spatial distribution map of the ecological security pattern mentioned in step S35 is divided into high ecological security zone, medium ecological security zone and low ecological security zone, providing a basis for ecological zoning management.

[0054] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for constructing a security pattern based on ecosystem health and the scarcity of service supply, characterized in that, Includes the following steps: S1. Constructing an ecological health evaluation system from the perspective of land-water-bay triple coupling; The specific process of step S1 is as follows: S11. Terrestrial Ecological Health Assessment: Based on ecosystem vitality, ecosystem organization, and ecosystem resilience, vegetation productivity, landscape connectivity, and resistance to disturbance are quantified. Specifically, the CASA model is used to simulate net primary productivity of vegetation to quantify ecosystem vitality; landscape diversity, landscape aggregation, and landscape morphology are used to measure ecosystem organization; and the InVEST model is used to simulate habitat quality to represent ecosystem resilience. The formula for calculating terrestrial ecological health is as follows: Among them, TEH represents terrestrial ecological health; EV represents ecosystem vitality; EO represents ecosystem organization; and ER represents ecosystem resilience. S12. Aquatic Ecological Health Assessment: For urban rivers, an evaluation index system is constructed from five dimensions: hydrology, water quality, aquatic ecology, morphological structure, and social function. For freshwater reservoirs and seawater lakes, a differentiated evaluation index system is constructed from four dimensions: water quality, biology, morphological structure, and social service function, based on differences in salinity gradients. The weight of each evaluation index is then determined through expert scoring to obtain the aquatic ecological health. S13. Assessment of the health of the bay ecosystem: Based on relevant scholars’ assessment studies of the bay ecosystem and combined with the estuary cruise survey, five indices were obtained from the perspectives of water environment quality and community structure change: eutrophication index, dissolved oxygen standard index, benthic community diversity, benthic community richness and benthic community evenness. The spatial distribution of the health of the bay ecosystem was obtained by using the inverse distance weighted interpolation method in ArcGIS 10.5 software. S14. Integrating the ecological health of multiple ecosystems across land, water, and bay areas, a holistic diagnosis of the ecological health of bay cities was achieved. The calculation formula is as follows: ,in, For the comprehensive index of ecological health; The BEH index is used for the ecological health of aquatic waters; the BEH index is used for the ecological health of bays. The BEH index is only included in the ecological health calculation of adjacent sea area administrative units. S2. Use the InVEST model to simulate the supply of ecosystem services such as water production, water purification and soil retention, combine it with the CASA model to calculate carbon storage, and collect demand data to construct an ecosystem service supply scarcity index. S3. Integrate the comprehensive ecological health index and the ecosystem service supply scarcity index using range standardization and entropy weight method to generate an ecological security pattern.

2. The method for constructing a security pattern based on ecosystem health and service scarcity as described in claim 1, characterized in that, The specific process of step S2 is as follows: S21. Calculate the supply-demand ratio of ecosystem services. The calculation formula is as follows: ,in, The supply-demand ratio for services to the t-th ecosystem; The needs of serving the t-th type of ecosystem; The supply of services for the t-th type of ecosystem; S22. Based on the scarcity of ecosystem service supply approach, the total supply and demand of ecosystem services are represented by the priority of ecosystem service types. The calculation formula is as follows: , ,in, The total supply of ecosystem services for subregion r; The total demand for ecosystem services for subregion r; t is the ecosystem service type number; Total number of ecosystem service types; Prioritize the t-th type of ecosystem service in subregion r; The provision of the t-th type of ecosystem service in subregion r; The demand for the t-th type of ecosystem service in subregion r; S23. Employ a urgency-based measure of regional differences and construct priorities using structural imbalances in ecosystem service types. The higher the overall imbalance level, the higher the imbalance level of ecosystem services, and the higher the priority of ecosystem services. The calculation formula is as follows: , , ,in, The urgency of subregion r; IBG r The overall imbalance level serving the total ecosystem of subregion r; The degree of imbalance of the t-th type of ecosystem service within subregion r; S24. Construct an ecosystem service scarcity index using urgency and priority, calculated as follows: ,in, The scarcity index of ecosystem service supply within subregion r.

3. The method for constructing a security pattern based on ecosystem health and service scarcity as described in claim 1, characterized in that, The specific steps of step S3 are as follows: S31. The two data points, the comprehensive ecological health index and the ecosystem service scarcity index, are standardized using the range method. The calculation formula is as follows: ,in, This represents the normalized value of the j-th indicator for the i-th sample. This represents the original value of the j-th indicator for the i-th sample; The j-th indicator is the minimum value among all samples; The j-th indicator is the maximum value among all samples; S32. Calculate the entropy value of each indicator. The calculation formula is as follows: ,in, Let be the entropy value of the j-th index; Let i be the proportion of the i-th sample under the j-th indicator; is the entropy normalization coefficient; 'a' is the total number of samples; S33. Calculate the information redundancy of each indicator. The calculation formula is as follows: ,in, The information entropy redundancy of the j-th indicator; S34. Calculate the weight of each indicator. The calculation formula is as follows: ,in, Let be the weight of the j-th indicator; The total number of evaluation indicators; S35. Generate a spatial distribution map of the ecological security pattern based on the weights of each indicator.

4. The method for constructing a security pattern based on ecosystem health and service scarcity as described in claim 3, characterized in that: The spatial distribution map of the ecological security pattern mentioned in step S35 is divided into high ecological security zone, medium ecological security zone and low ecological security zone, providing a basis for ecological zoning management.

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