Ecological slope carbon sink metering method

Abstract

The invention belongs to the technical field of ecological environment monitoring and management, and particularly relates to an ecological slope carbon sink metering method. Dividing the ecological slope into a plurality of independent areas according to topographic features, and dividing the independent areas into different gradient grades according to gradients; in each subarea, further classifying the subareas into different vegetation type areas according to vegetation types, namely classification areas; selecting a representative quadrat in each classification area, wherein the size of the quadrat is adjusted according to different vegetation types; calculating the carbon sequestration amount of vegetation in each quadrat; correcting a metering result according to different gradients and vegetation types; and summarizing the carbon sequestration amounts of all the quadrats. According to the ecological slope carbon sink metering method provided by the invention, the topographic features and vegetation types of the ecological slope are comprehensively considered, the method is suitable for a carbon sink metering scheme under complex environmental conditions, and the accuracy, reliability and operability of carbon sink metering under an ecological slope environment are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ecological environment monitoring and management, and specifically relates to an ecological slope carbon sink measurement method. Background Art

[0002] As global climate change intensifies, carbon emissions have become one of the focuses of international attention. Natural ecosystems such as forests and grasslands, as important carbon sink resources, play an irreplaceable role in mitigating the greenhouse effect and improving environmental quality. Ecological slopes refer to vegetation-covered areas located on the edge of terrain such as mountains and river banks. Due to their special geographical location and complex terrain conditions, ecological slopes are not only key areas for soil and water conservation, but also potential important sources of carbon sinks. However, due to the terrain complexity and vegetation diversity of ecological slopes, traditional carbon sink measurement methods are difficult to accurately reflect their carbon sink capacity, resulting in large uncertainties and deviations in carbon sink data.

[0003] At present, the carbon sink measurement of ecological slopes mainly relies on general vegetation survey methods, such as fixed plot survey method and random plot survey method. Although these methods can estimate the carbon storage of ecosystems to a certain extent, they have obvious limitations when applied to ecological slopes. First, traditional methods fail to fully consider the impact of the terrain characteristics of ecological slopes on vegetation growth, such as differences in environmental factors such as moisture and light caused by slope changes. Secondly, different vegetation types have different response mechanisms to environmental conditions, and existing technologies often adopt unified plot design and data processing standards, ignoring the individual differences of vegetation types, making it difficult to take into account the accuracy and operability of carbon sink measurement. In addition, there is currently a lack of data analysis models specifically tailored to the characteristics of ecological slopes, and it is impossible to effectively integrate multi-dimensional information such as terrain and vegetation to achieve standardized dynamic monitoring and evaluation of carbon sinks to reduce data interference caused by random factors. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an ecological slope carbon sink measurement method, which aims to propose a carbon sink measurement scheme suitable for complex environmental conditions by comprehensively considering the terrain characteristics and vegetation types of the ecological slope, so as to improve the accuracy, reliability and operability of carbon sink measurement in the ecological slope environment.

[0005] The first aspect of the present invention is to provide a method for measuring ecological slope carbon sequestration, comprising the following steps: Step S1: dividing the ecological slope into multiple independent areas according to the terrain characteristics, and dividing them into different slope grades according to the slope; Step S2: Within each partition, further classify into different vegetation type areas according to the vegetation type, i.e., classification areas; Step S3: Select representative samples in each classification area, and the size of the samples is adjusted according to different vegetation types; Step S4: Calculate the carbon sequestration of vegetation in each sample plot, including the carbon sequestration of aboveground plants, underground root plants, and litter plants; Step S5: using correction coefficients to adjust the plant carbon sink amount according to different slopes and vegetation types, and calculating a calibrated carbon sink measurement result; Step S6: Summarize the carbon sinks of all sample plots and calculate the carbon sink of the entire ecological slope area.

[0006] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S1, the slope is divided into 5 slope grades according to the slope size.

[0007] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S1, the slope classification standard is: Level 1 slope: slope <5°; Level 2 slope: 5°≤slope<15°; Level 3 slope: 15°≤slope<30°; Level 4 slope: 30°≤slope<45°; Level 5 slope: slope ≥45°.

[0008] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S2, the vegetation types include herbaceous areas, shrub areas, and tree areas.

[0009] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S2, the vegetation classification standard is: Herbaceous area: divided into level 1 herbaceous area, level 2 herbaceous area and level 3 herbaceous area according to the height of the herbaceous plants; Shrub area: divided into level 1 shrubs, level 2 shrubs, and level 3 shrubs according to the height of the shrubs; Tree area: According to the height of the trees, it is divided into level 1 trees, level 2 trees, and level 3 trees.

[0010] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S3, the selection criteria of the sample plot are: The sample plots in the herbaceous area were set to 1m × 1m; The sample plots in the shrub area were set to 4m × 4m; The sample plot in the tree area is set to 10m×10m.

[0011] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S4, the carbon sequestration calculation formula is: CSq = Ba×CFa + Bb×CFb + Bl×CFl, Among them, Ba is the aboveground plant mass, CFa is the aboveground plant carbon density, Bb is the underground root plant mass, CFb is the underground root carbon density, Bl is the litter plant mass, and CFl is the litter carbon density.

[0012] As a further optimization scheme for the above ecological slope carbon sink measurement method, the carbon density calculation formula is: CFa = CFa_0×f1; CFb = CFb_0×f2; CFl = CFl_0×f3; Among them, CFa_0, CFb_0, and CFl_0 are the benchmark plant carbon densities, and f1, f2, and f3 are the corresponding correction coefficients.

[0013] As a further optimization scheme of the above ecological slope carbon sink measurement method, in step S6, the carbon storage of each area is calculated using the following formula: CS=SUM(CSqn×Nn) Among them, CSqn is the carbon storage of the nth sample plot, and Nn is the equivalent number of corresponding classification samples in the region.

[0014] Beneficial Effects The present invention can more accurately reflect the carbon sequestration conditions in different areas by carefully zoning and classifying the ecological slopes according to the terrain characteristics and vegetation types, and is helpful for scientifically evaluating the actual carbon sequestration amount of plants on the ecological slopes.

[0015] The present invention proposes reliable and easy-to-implement sample plot selection criteria and data collection procedures, which provide a clear operational basis for field investigations and data collection. In particular, different sample plot sizes are set according to the characteristics of different vegetation types, which not only takes into account the spatial requirements for vegetation growth, but also ensures the representativeness of the samples.

[0016] It is optimized for the special environment of ecological slopes, including taking into account and correcting factors such as terrain complexity and vegetation diversity, and has strong adaptability and accuracy. DETAILED DESCRIPTION

[0017] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0018] The present invention proposes a carbon sink measurement method suitable for ecological slopes. The method takes into account the particularity of ecological slopes, such as the complexity of terrain and diversity of vegetation on ecological slopes, and improves the feasibility and accuracy of carbon sink measurement.

[0019] 1. Zoning and classification of ecological slopes Zoning: First, the ecological slope is divided into several relatively independent areas according to its topographical characteristics. The slopes are classified according to their gentleness and steepness as follows: Level 1 slope: gentle area, slope <5°; Level 2 slope: gentle slope area, slope 5°≤<15°; Level 3 slope: medium slope area, slope 15°≤<30°; Level 4 slope: steep slope area, slope 30°≤<45°; Level 5 slope: extremely steep slope area, slope ≥45°.

[0020] Classification: In each zone, the vegetation types are further classified into herbaceous area, shrub area and tree area. Among them, according to the height of the herbaceous plants, it is divided into Class 1 herbaceous, Class 2 herbaceous and Class 3 herbaceous; according to the height of the shrubs, it is divided into Class 1 shrubs, Class 2 shrubs and Class 3 shrubs; according to the height of the trees, it is divided into Class 1 trees, Class 2 trees and Class 3 trees.

[0021] Herbaceous Area Level 1 Herb: Low-growing herb, height <30cm; For example: Bermuda grass, ryegrass.

[0022] Level 2 Herbaceous Plants: Medium-height herbaceous plants, 30cm≤height<60cm; For example: Fescue, Tall Fescue.

[0023] Level 3 Herbs: tall herbaceous plants, height ≥ 60 cm; For example: reeds and miscanthus.

[0024] Bush area Level 1 shrubs: low shrubs, height <1m; For example: boxwood, Ligustrum lucidum.

[0025] Level 2 shrubs: medium height shrubs, 1m≤height<2m; For example: Forsythia suspensa and Amorpha fruticosa.

[0026] Level 3 shrubs: tall shrubs, height ≥ 2m; For example: red yew, wisteria.

[0027] Arbor Area Class 1 trees: low trees, height <5m; For example: cherry blossoms and weeping crabapples.

[0028] Level 2 trees: medium-height trees, 5m≤height<10m; For example: birch, maple.

[0029] Level 3 trees: tall trees, height ≥ 10m; For example: pine tree, oak tree.

[0030] 2. Sample selection and data collection Sample plot selection: In each classification area, select several representative sample plots. The size of the sample plot is adjusted according to the vegetation type. The sample plot in the herb area is set to 1m×1m, the sample plot in the shrub area is set to 4m×4m, and the sample plot in the tree area is set to 10m×10m.

[0031] 3. Data Analysis and Calculation Carbon sequestration calculation: Use the following formula to calculate vegetation carbon sequestration: CSq=Ba×CFa+Bb×CFb+Bl×CFl Among them, Ba is the aboveground plant mass, CFa is the aboveground plant carbon density, Bb is the underground root plant mass, CFb is the underground root carbon density, Bl is the litter plant mass, and CFl is the litter carbon density.

[0032] Ba aboveground plant mass, Bb underground root plant mass, and Bl litter plant mass were measured by weighing method.

[0033] The carbon density of aboveground plants (CFa), underground roots (CFb), and litter (CFl) were calculated using the following formulas: CFa = CFa_0 × f1; CFb = CFb_0×f2; CFl = CFl_0×f3.

[0034] Among them, CFa_0, CFb_0, CFl_0 are the benchmark plant carbon densities, and f1, f2, f3 are correction coefficients.

[0035] The baseline plant carbon density is listed below: Herbaceous Area Level 1 Herb (Height <30cm) CFa_0: 0.45 g C / g DM CFb_0: 0.40 g C / g DM CFl_0: 0.43 g C / g DM Level 2 Herbaceous (30cm≤height<60cm) CFa_0: 0.46 g C / g DM CFb_0: 0.41 g C / g DM CFl_0: 0.44 g C / g DM Level 3 Herb (Height ≥ 60cm) CFa_0: 0.47 g C / g DM CFb_0: 0.42 g C / g DM CFl_0: 0.45 g C / g DM Bush area Level 1 shrubs (height < 1m) CFa_0: 0.48 g C / g DM CFb_0: 0.42 g C / g DM CFl_0: 0.45 g C / g DM Level 2 shrubs (1m≤height<2m) CFa_0: 0.49 g C / g DM CFb_0: 0.43 g C / g DM CFl_0: 0.46 g C / g DM Level 3 shrubs (height ≥ 2m) CFa_0: 0.50 g C / g DM CFb_0: 0.44 g C / g DM CFl_0: 0.47 g C / g DM Arbor Area Class 1 trees (height < 5m) CFa_0: 0.49 g C / g DM CFb_0: 0.43 g C / g DM CFl_0: 0.46 g C / g DM Level 2 trees (5m≤height<10m) CFa_0: 0.50 g C / g DM CFb_0: 0.44 g C / g DM CFl_0: 0.47 g C / g DM Level 3 trees (height ≥ 10m) CFa_0: 0.51 g C / g DM CFb_0: 0.45 g C / g DM CFl_0: 0.48 g C / g DM The correction factor for aboveground plant carbon density (f1) is as follows: Level 1 slope: herbaceous area 0.97, shrub area 1.03, tree area 1.05 Level 2 slope: herbaceous area 0.99, shrub area 1.03, tree area 1.06 Level 3 slope: herbaceous area 1.03, shrub area 1.05, tree area 1.10 Level 4 slope: Herbaceous area 1.09, shrub area 1.14, tree area 1.15 Level 5 slope: Herbaceous area 1.11, Shrub area 1.16, Tree area 1.18 The correction factor for underground root plant carbon density (f2) is as follows: Level 1 slope: herbaceous area 0.93, shrub area 0.99, tree area 1.01 Level 2 slope: herbaceous area 0.96, shrub area 1.01, tree area 1.02 Level 3 slope: herbaceous area 0.99, shrub area 1.05, tree area 1.06 Level 4 slope: Herbaceous area 1.06, shrub area 1.09, tree area 1.10 Level 5 slope: Herbaceous area 1.08, shrub area 1.11, tree area 1.14 The correction factor for litter carbon density (f3) is as follows: Level 1 slope: herbaceous area 0.89, shrub area 0.95, tree area 0.97 Level 2 slope: herbaceous area 0.92, shrub area 0.97, tree area 0.98 Level 3 slope: herbaceous area 0.95, shrub area 1.00, tree area 1.01 Level 4 slope: herbaceous area 1.01, shrub area 1.04, tree area 1.05 Level 5 slope: Herbaceous area 1.03, Shrub area 1.05, Tree area 1.08 Regional carbon stock calculation: The carbon stock of each region was calculated using the following formula: CS=SUM(CSqn×Nn) Among them, CSqn is the carbon storage of the nth sample plot, and Nn is the equivalent number of corresponding classification samples in the region.

[0036] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with the technology in this field can understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. The ecological slope carbon sink measurement method is characterized by: The following steps are involved: Step S1: dividing the ecological slope into multiple independent areas according to the terrain characteristics, and dividing them into different slope grades according to the slope; Step S2: Within each partition, further classify into different vegetation type areas according to the vegetation type, i.e., classification areas; Step S3: Select representative samples in each classification area, and the size of the samples is adjusted according to different vegetation types; Step S4: Calculate the carbon sequestration of vegetation in each sample plot, including the carbon sequestration of aboveground plants, underground root plants, and litter plants; Step S5: using correction coefficients to adjust the plant carbon sink amount according to different slopes and vegetation types, and calculating a calibrated carbon sink measurement result; Step S6: Summarize the carbon sinks of all sample plots and calculate the carbon sink of the entire ecological slope area.

2. The ecological slope carbon sink measurement method according to claim 1 is characterized by: In step S1, the slope is divided into 5 levels according to the slope size.

3. The ecological slope carbon sink measurement method according to claim 1 is characterized by: In step S1, the slope classification standard is: Level 1 slope: slope <5°; Level 2 slope: 5°≤slope<15°; Level 3 slope: 15°≤slope<30°; Level 4 slope: 30°≤slope<45°; Level 5 slope: slope ≥45°.

4. The ecological slope carbon sink measurement method according to claim 3 is characterized by: In step S2, the vegetation types include herbaceous area, shrub area, and tree area.

5. The ecological slope carbon sink measurement method according to claim 3 is characterized by: In step S2, the vegetation classification standard is: Herbaceous area: divided into level 1 herbaceous area, level 2 herbaceous area and level 3 herbaceous area according to the height of the herbaceous plants; Shrub area: divided into level 1 shrubs, level 2 shrubs, and level 3 shrubs according to the height of the shrubs; Tree area: According to the height of the trees, it is divided into level 1 trees, level 2 trees, and level 3 trees.

6. The ecological slope carbon sink measurement method according to claim 5 is characterized by: In step S3, the selection criteria of the sample plot are: The sample plots in the herbaceous area were set to 1m × 1m; The sample plots in the shrub area were set to 4m × 4m; The sample plot in the tree area is set to 10m×10m.

7. The ecological slope carbon sink measurement method according to claim 6 is characterized by: In step S4, the carbon fixation amount calculation formula is: CSq = Ba×CFa + Bb×CFb + Bl×CFl, Among them, Ba is the aboveground plant mass, CFa is the aboveground plant carbon density, Bb is the underground root plant mass, CFb is the underground root carbon density, Bl is the litter plant mass, and CFl is the litter carbon density.

8. The ecological slope carbon sink measurement method according to claim 7 is characterized by: The carbon density calculation formula is: CFa = CFa_0×f1; CFb = CFb_0×f2; CFl = CFl_0×f3; Among them, CFa_0, CFb_0, and CFl_0 are the benchmark plant carbon densities, and f1, f2, and f3 are the corresponding correction coefficients.

9. The ecological slope carbon sink measurement method according to claim 8 is characterized by: In step S6, the carbon storage of each region is calculated using the following formula: CS=SUM(CSqn×Nn) Among them, CSqn is the carbon storage of the nth sample plot, and Nn is the equivalent number of corresponding classification samples in the region.