Search

CN-121980753-A - Ecological system service simulation method and system based on spatial gradient analysis

CN121980753ACN 121980753 ACN121980753 ACN 121980753ACN-121980753-A

Abstract

The application provides an ecological system service simulation method and system based on spatial gradient analysis, and belongs to the technical field of ecological system service evaluation. The method comprises the steps of determining a service supply unit and a non-supply unit of a target ecosystem service type, performing spatial gradient analysis on each supply unit to determine a service supply area of the supply unit, determining a non-supply grid of the nearest ecosystem service in the service supply area on each supply grid as a reference unit, taking the value of an environmental parameter of the reference unit as a background value, and calculating the difference between the actual value and the background value of the environmental parameter of the supply grid to obtain the supply quantity of the ecosystem service. According to the scheme, experience parameters and complex early-stage data preparation are not needed, needed data can be obtained from a public channel, the background climate effect of a local area is stripped by quantifying the service supply range and searching a reference unit closest to the service supply range, the net service supply quantity of an ecological system is accurately reflected, and the simulation accuracy is improved.

Inventors

  • XIAO YU
  • MAO HUI

Assignees

  • 中国科学院地理科学与资源研究所

Dates

Publication Date
20260505
Application Date
20251219

Claims (9)

  1. 1. An ecological system service simulation method based on spatial gradient analysis is characterized by comprising the following steps: determining a service supply unit and a non-supply unit of a target ecosystem service type, and acquiring environment parameter grid data corresponding to the target ecosystem service type; performing, for each supply unit, a spatial gradient analysis to determine a service supply area of the supply unit; Determining, for each supply grid, a non-supply grid of the nearest ecosystem service within the service supply area as a reference unit; taking the value of the environmental parameter of the reference unit as a background value, and calculating the difference between the actual value of the environmental parameter of the supply grid and the background value to obtain the supply quantity of the ecosystem service; The method comprises the steps of taking a vector boundary of a supply unit as a starting point, generating a series of annular buffer areas with gradually increased radius outwards, carrying out pixel statistics on the same land utilization type supply unit according to the same buffer radius interval, calculating the average value of environmental parameters, analyzing the trend of the average value of the environmental parameters relative to the change of the buffer radius, defining the outer boundary radius of a corresponding buffer area when the change trend tends to be stable as the effective service distance of the corresponding type service supply unit, and further defining a space area with the radius smaller than or equal to the effective service distance as the service supply area of the type service supply unit.
  2. 2. The method of claim 1, wherein the environmental parameters include surface temperature, relative humidity, and the target ecosystem service type includes cooling service and humidification service, respectively.
  3. 3. The method of claim 1, wherein the radius of the annular buffer is incremented in equidistant fashion by a pitch of 50 meters.
  4. 4. The method according to claim 1, wherein analyzing the trend of the average value of the environmental parameter with respect to the buffer radius change and defining the outer boundary radius of the corresponding previous buffer zone when the trend of change tends to be stable as the effective service distance of the corresponding type of service providing unit comprises: drawing a line graph of the average value of the environmental parameters along with the change of the buffer radius; and analyzing a line graph, and if the average value change trend of the environmental parameter tends to be stable under a certain buffer radius, determining the outer boundary radius of the previous buffer zone when the average value change trend tends to be stable as the effective service distance.
  5. 5. The method according to any one of claims 1 to 4, wherein obtaining the environmental parameter raster data corresponding to the target ecosystem service type includes: And obtaining surface temperature data by inversion of remote sensing images or obtaining relative humidity data by spatial interpolation of meteorological site data, and filling up missing values in the environmental parameter grid data.
  6. 6. An ecosystem service simulation system based on spatial gradient analysis, the system being configured to perform the steps of the method according to any one of claims 1 to 5, comprising: The data acquisition and division unit is configured to determine a service supply unit and a non-supply unit of the service type of the target ecosystem and acquire environment parameter grid data corresponding to the service type of the target ecosystem; A supply distance determination unit configured to perform a spatial gradient analysis for each supply unit to determine a service supply area of the supply unit; a proximity analysis unit configured to determine, for each supply grid, a non-supply grid of the nearest-neighbor ecosystem service within the service supply area as a reference unit; a supply calculation unit configured to calculate a difference between an actual value of an environmental parameter of the supply grid and a background value using the value of the environmental parameter of the reference unit as the background value, and obtain a supply amount of an ecosystem service; The method comprises the steps of taking a vector boundary of a supply unit as a starting point, generating a series of annular buffer areas with gradually increased radius outwards, carrying out pixel statistics on the same land utilization type supply unit according to the same buffer radius interval, calculating the average value of environmental parameters, analyzing the trend of the average value of the environmental parameters relative to the change of the buffer radius, defining the outer boundary radius of a corresponding buffer area when the change trend tends to be stable as the effective service distance of the corresponding type service supply unit, and further defining a space area with the radius smaller than or equal to the effective service distance as the service supply area of the type service supply unit.
  7. 7. A computer device comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to carry out the steps of the method according to any one of claims 1 to 5.
  8. 8. A computer readable storage medium having stored thereon a computer program/instruction, which when executed by a processor, implements the steps of the method of any of claims 1 to 5.
  9. 9. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of any of claims 1 to 5.

Description

Ecological system service simulation method and system based on spatial gradient analysis Technical Field The application relates to the technical field of ecological system service evaluation, in particular to an ecological system service simulation method and system based on spatial gradient analysis. Background The ecological system service, in particular to the cooling and humidifying service with the local microclimate regulating function, has important significance for relieving the heat island effect, improving the thermal comfort level of the living environment and enhancing the regional climate toughness. In the prior art, simulation methods for cooling and humidifying services mainly comprise two types, namely a physical theoretical model based on an energy balance or hydrothermal coupling process and a simplified model represented by a InVEST urban cooling model, wherein the model is mainly used for evaluating vegetation cooling effect based on an urban heat island effect (UHI) theory, and the evaluation result is a refrigerating capacity (CC) index, so that the cooling effect is indirectly represented. However, although the theory mechanism is clear, the traditional method needs to rely on a large amount of experience parameters and parameter adjustment, has higher technical threshold, has relatively complex requirement on input data (such as InVEST city cooling model needs to provide a biophysical table), and is difficult to popularize and use in regions with relatively deficient data in fine space dimensions such as villages and towns, neighborhood and the like. In addition, the cooling and humidifying service belongs to local microclimate regulation service, has the characteristics of quick response, small space scale (street level and village level) and space-time heterogeneity, and the processing mode of the space heterogeneity in the prior art is simplified, for example, a InVEST model only considers the space attenuation effect of a large green land (> 2 ha), and the service distance is artificially set to be 450m, so that the service evaluation deviation of an ecosystem under a fine scale is larger. Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art. Disclosure of Invention The application aims to provide an ecological system service simulation method and system based on spatial gradient analysis, which are used for solving or relieving the problems in the prior art. In order to achieve the above object, the present application provides the following technical solutions: in a first aspect, the present application provides an ecosystem service simulation method based on spatial gradient analysis, including: determining a service supply unit and a non-supply unit of a target ecosystem service type, and acquiring environment parameter grid data corresponding to the target ecosystem service type; performing, for each supply unit, a spatial gradient analysis to determine a service supply area of the supply unit; Determining, for each supply grid, a non-supply grid of the nearest ecosystem service within the service supply area as a reference unit; taking the value of the environmental parameter of the reference unit as a background value, and calculating the difference between the actual value of the environmental parameter of the supply grid and the background value to obtain the supply quantity of the ecosystem service; The method comprises the steps of taking a vector boundary of a supply unit as a starting point, generating a series of annular buffer areas with gradually increased radius outwards, carrying out pixel statistics on the same land utilization type supply unit according to the same buffer radius interval, calculating the average value of environmental parameters, analyzing the trend of the average value of the environmental parameters relative to the change of the buffer radius, defining the outer boundary radius of a corresponding buffer area when the change trend tends to be stable as the effective service distance of the corresponding type service supply unit, and further defining a space area with the radius smaller than or equal to the effective service distance as the service supply area of the type service supply unit. According to the technical scheme, accurate setting of experience parameters of a physical process is not needed, complicated regional data is not needed to be provided, basic data and environment parameters, such as remote sensing, weather (temperature, humidity) and the like (the difficulty in acquiring the data is low) are only needed to be acquired, a service supply range (namely a service supply area) is quantified by drawing a buffer area and analyzing gradient changes of the buffer area, and the difference between an actual value and a background value (from a reference unit) of the environment parameters is used for representing the service supply quantity of an ecosystem, so that spat