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CN-122020094-A - Spectral data-based artificial reclamation plant carbon fixation quantification method and system

CN122020094ACN 122020094 ACN122020094 ACN 122020094ACN-122020094-A

Abstract

The invention provides a method and a system for quantifying carbon fixation of artificially reclaimed plants, which relate to the technical field of carbon fixation amount, and are characterized in that a reclaimed area is divided into a plurality of areas, the divided areas are divided into a central area and other areas, the instantaneous photosynthetic efficiency of the central area on the same day is obtained to calculate the carbon fixation amount of the central area on the same day, remote sensing data of each area on the same day is obtained, the biomass increment of reclaimed crops of each area on the same day is determined based on the remote sensing data, soil data of each area and the biomass increment of reclaimed crops of each area on the same day are obtained, a biomass increment judgment rule and a biomass increment adjustment rule are set based on the obtained biomass increment, the biomass increment of each area is adjusted based on the rule to obtain the corresponding final biomass increment, and the carbon fixation amount of other areas is estimated by combining the final biomass increment of reclaimed crops of the central area and other areas on the same day.

Inventors

  • WANG XUQIN
  • TIAN XIAOYAN
  • LIU RUIGUO
  • GUO JUAN

Assignees

  • 内蒙古自治区环境监测总站鄂尔多斯分站

Dates

Publication Date
20260512
Application Date
20260227

Claims (10)

  1. 1. The artificial reclamation plant carbon fixation quantification method based on the spectrum data is characterized by comprising the following specific steps of: Dividing a reclamation area into a plurality of areas, dividing the divided areas into a central area and other areas, and calculating the carbon sequestration amount of the central area on the same day based on the instantaneous photosynthetic efficiency of the central area on the same day; Step 2, acquiring the spectral data of each area on the same day, identifying a leaf part and a soil part in the spectral data, extracting the reflectivity of a first characteristic wave band for the spectral data of each leaf part, determining the change condition of a vegetation index in one day, and determining the biomass increment of the reclamation crops in each area on the same day by combining the mapping relation of the vegetation index and the biomass; Step 3, based on the spectral data of the soil part in each area, extracting the reflectivity data of a second characteristic wave band to determine the soil data of each area, forming a soil spectral vector, forming a soil matrix by the soil spectral vectors of all areas, analyzing the soil matrix to obtain a standard soil spectral vector, setting a biomass increment judgment rule based on the standard soil spectral vector and the soil spectral vector of each area, obtaining the biomass increment of the reclaimed crop of each area in the previous N days, and setting a biomass increment adjustment rule in combination with the biomass increment of the reclaimed crop of each area in the current day; step 4, judging whether the biomass increment of the reclaimed crops in each area on the same day meets the biomass increment judgment rule one by one, if so, taking the biomass increment as the final biomass increment of the reclaimed crops in the area on the same day, otherwise, adjusting the biomass increment of the reclaimed crops in the area on the same day based on the biomass increment adjustment rule, and taking the adjusted value as the final biomass increment of the reclaimed crops in the area on the same day; and 5, estimating the carbon sequestration amount of other areas by combining the final biomass increment of the reclaimed crops in the central area and other areas on the same day and the carbon sequestration amount of the central area on the same day.
  2. 2. The method for quantifying carbon sequestration of artificially reclaimed plants according to claim 1, wherein the logic for dividing the central region and the other regions is as follows: the area containing the geometric center of the reclamation area is called a center area, and the non-center area is called other areas; Selecting a plurality of test points on the leaves of the reclaimed crops in the central area, for each test point, obtaining the instantaneous photosynthetic efficiency of the position of the test point, substituting a daily net assimilation quantity calculation formula to calculate the daily net assimilation quantity of the test point, calculating the average value of the daily net assimilation quantity, obtaining the leaf area in the central area, and calculating the carbon sequestration quantity in the central area based on the average value of the daily net assimilation quantity, the mass fraction of carbon dioxide and the leaf area in the central area.
  3. 3. The method for quantifying carbon fixation of artificially reclaimed plants is characterized by identifying a leaf part and a soil part in spectrum data by a spectrum angle mapping method, wherein the logic is that standard leaf remote sensing spectrum data are acquired and constructed as standard leaf vectors, the spectrum data of each pixel point are constructed as pixel point vectors, for each pixel point, the dot product of the standard leaf vector and the pixel point vector is calculated and is called as the vector dot product of the pixel point, the product of the standard leaf vector length and the pixel point vector length is calculated and is called as the module product of the pixel point, the dot product of the pixel point is compared with the upper module product to obtain a leaf spectrum angle of the pixel point, a leaf spectrum angle threshold is preset, if the leaf spectrum angle of a pixel point is smaller than the leaf spectrum angle threshold, the pixel point is called as a leaf pixel point, and otherwise the pixel point of soil.
  4. 4. The method for quantifying carbon sequestration of artificially reclaimed plants of claim 3, wherein the remote sensing data of the day comprises remote sensing images acquired at a set first time and a set second time, wherein the first time is one of 8-9 hours in the morning and the second time is one of 4-5 hours in the afternoon; the reflectivity of the first characteristic band includes near infrared reflectivity and infrared reflectivity; For each blade pixel point in the remote sensing image, the result of subtracting the infrared reflectivity from the near infrared reflectivity is called a first reflectivity, the result of calculating the near infrared reflectivity plus the infrared reflectivity is called a second reflectivity, and the vegetation index is the ratio of the first reflectivity to the second reflectivity; The mapping relation between the vegetation index and biomass is constructed based on a unitary linear regression model; For each collected remote sensing image at the first moment, the biomass of the reclaimed crop of the area on the day is the sum of the inverted biomass of all the blade pixels in the blade part of the area, for each collected remote sensing image at the second moment, the biomass of the reclaimed crop of the area on the day is the sum of the inverted biomass of all the blade pixels in the blade part of the area, and the increment of the biomass of the reclaimed crop of each area on the day is the difference of the reclaimed crop biomass of the remote sensing data collected at the first moment and the second moment.
  5. 5. The method for quantifying carbon sequestration in artificially reclaimed plants according to claim 1, wherein the soil data comprises a reflectance of 2.1-2.4 μm band, a reflectance of 8-14 μm band, a reflectance of 0.45-0.52 μm band, and a reflectance of 0.45-0.52 μm band; The soil data vector is a column vector formed by soil data of a single area; The soil matrix is a matrix formed by soil data vectors of all areas.
  6. 6. The method for quantifying carbon sequestration of artificially reclaimed plants according to claim 5, wherein the logic for obtaining the standard soil data vector comprises the steps of calculating eigenvalues and eigenvectors of a soil matrix, and taking the eigenvector corresponding to the largest eigenvalue as the standard soil data vector.
  7. 7. The method for quantifying carbon sequestration in artificially reclaimed plants of claim 6, wherein the biomass increment determination rule is such that the Euclidean distance between the soil data vector and the standard soil data vector is less than a predetermined Euclidean distance threshold.
  8. 8. The method for quantifying carbon fixation of artificially reclaimed plants according to claim 1, wherein the biomass increment adjustment rule is that if the biomass increments of the reclaimed crops are ordered in time sequence, the average value of the biomass increments of the reclaimed crops on the day and the two days before and after is used as the corrected biomass increment of the day in the biomass increments of the reclaimed crops on the N days, the corrected biomass increment is input into linear fitting software to obtain a corresponding biomass increment curve, the biomass increment of the reclaimed crops on the day is predicted based on the biomass increment curve, and the average value of the biomass increment of the reclaimed crops on the day and the predicted biomass increment of the region is used as the final biomass increment.
  9. 9. The method for quantifying the carbon sequestration of artificially reclaimed plants according to claim 1, wherein the logic for estimating the carbon sequestration of the other areas is to multiply the final biomass increment of the reclaimed crop on the same day with the carbon sequestration of the reclaimed crop on the same day in the central area for each other area, and divide the multiplied result by the final biomass increment of the reclaimed crop on the same day in the central area to obtain the carbon sequestration of the reclaimed crop on the same day in the area.
  10. 10. The artificial reclamation plant carbon fixation quantification system is characterized in that the system is used for realizing the artificial reclamation plant carbon fixation quantification method according to any one of claims 1 to 8, and specifically comprises the following steps: The standard sampling module is used for dividing the reclamation area into a plurality of areas, dividing the divided areas into a central area and other areas, and calculating the carbon sequestration amount of the central area on the same day based on the instantaneous photosynthetic efficiency of the central area on the same day; The biological inversion module is used for acquiring the spectral data of each area on the same day, identifying a leaf part and a soil part in the spectral data, extracting the reflectivity of a first characteristic wave band for the spectral data of each leaf part, determining the change condition of a vegetation index in one day, and determining the biomass increment of the reclamation crops of each area on the same day by combining the mapping relation of the vegetation index and the biomass; The soil analysis module is used for extracting the reflectivity data of the soil part in each area to determine the soil data of each area and form a soil spectrum vector, forming a soil matrix by the soil spectrum vectors of all areas, analyzing the soil matrix to obtain a standard soil spectrum vector, setting a biomass increment judgment rule based on the standard soil spectrum vector and the soil spectrum vector of each area, acquiring the biomass increment of the reclaimed crop in each area in the previous N days, and setting a biomass increment adjustment rule in combination with the biomass increment of the reclaimed crop in each area in the same day; The final adjustment module is used for judging whether the biomass increment of the reclaimed crops in each area on the same day meets the biomass increment judgment rule one by one, if so, the biomass increment of the reclaimed crops in each area on the same day is used as the final biomass increment of the reclaimed crops in the area on the same day, otherwise, the biomass increment of the reclaimed crops in each area on the same day is adjusted based on the biomass increment adjustment rule, and the adjusted value is used as the final biomass increment of the reclaimed crops in each area on the same day; and the result deriving module is used for estimating the carbon sequestration amount of the other areas by combining the final biomass increment of the reclaimed crops in the central area and the other areas on the same day and the carbon sequestration amount of the central area on the same day.

Description

Spectral data-based artificial reclamation plant carbon fixation quantification method and system Technical Field The invention relates to the technical field of carbon sequestration amount calculation, in particular to a method and a system for artificially reclamation plant carbon sequestration. Background In the current ecological environment restoration and carbon sequestration metering field, accurate quantification of plant carbon sequestration in an artificial reclamation area has been a technical difficulty. The traditional method mainly relies on field sampling and laboratory analysis, has the problems of high cost and low efficiency although the precision is high, and is difficult to realize dynamic monitoring with large range and continuity. In addition, the existing carbon sequestration estimation method based on the remote sensing technology often ignores the daily change characteristics of plant photosynthesis and the biomass increment dynamic evolution process, so that the estimation result has obvious deviation, and the estimation result is particularly obvious in the reclamation area with high heterogeneity of soil and vegetation. These limitations make it difficult for existing methods to meet the fine and scalability requirements of ecological restoration effect assessment and carbon sequestration management. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a carbon fixation quantification method and system for artificially reclaimed plants, which are used for solving the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: The artificial reclamation plant carbon fixation quantification method specifically comprises the following steps: Dividing a reclamation area into a plurality of areas, dividing the divided areas into a central area and other areas, and calculating the carbon sequestration amount of the central area on the same day based on the instantaneous photosynthetic efficiency of the central area on the same day; Step 2, acquiring the spectral data of each area on the same day, identifying a leaf part and a soil part in the spectral data, extracting the reflectivity of a first characteristic wave band for the spectral data of each leaf part, determining the change condition of a vegetation index in one day, and determining the biomass increment of the reclamation crops in each area on the same day by combining the mapping relation of the vegetation index and the biomass; Step 3, based on the spectral data of the soil part in each area, extracting the reflectivity data of a second characteristic wave band to determine the soil data of each area, forming a soil spectral vector, forming a soil matrix by the soil spectral vectors of all areas, analyzing the soil matrix to obtain a standard soil spectral vector, setting a biomass increment judgment rule based on the standard soil spectral vector and the soil spectral vector of each area, obtaining the biomass increment of the reclaimed crop of each area in the previous N days, and setting a biomass increment adjustment rule in combination with the biomass increment of the reclaimed crop of each area in the current day; step 4, judging whether the biomass increment of the reclaimed crops in each area on the same day meets the biomass increment judgment rule one by one, if so, taking the biomass increment as the final biomass increment of the reclaimed crops in the area on the same day, otherwise, adjusting the biomass increment of the reclaimed crops in the area on the same day based on the biomass increment adjustment rule, and taking the adjusted value as the final biomass increment of the reclaimed crops in the area on the same day; and 5, estimating the carbon sequestration amount of other areas by combining the final biomass increment of the reclaimed crops in the central area and other areas on the same day and the carbon sequestration amount of the central area on the same day. Further, the logic for dividing the center region and the other regions is: the area containing the geometric center of the reclamation area is called a center area, and the non-center area is called other areas; Selecting a plurality of test points on the leaves of the reclaimed crops in the central area, for each test point, obtaining the instantaneous photosynthetic efficiency of the position of the test point, substituting a daily net assimilation quantity calculation formula to calculate the daily net assimilation quantity of the test point, calculating the average value of the daily net assimilation quantity, obtaining the leaf area in the central area, and calculating the carbon seque