A method for assessing grassland carbon sinks

Abstract

An embodiment of the present invention relates to a method for assessing and processing grassland carbon sinks, comprising: processing vegetation in selected sample plots to determine the annual net growth biomass of grasses and the average carbon content of grasses, and calculating the initial total annual CO2 absorption by grasslands; determining the daily maximum photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, daily maximum photosynthesis rate, air pressure values under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model; calculating the total amount of vegetation litter based on the total autotrophic respiration consumption of vegetation; calculating the total amount of gas released by microbial decomposition; calculating the total amount of CO2 absorbed by grasslands based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition; and calculating the total amount of CO2 absorbed by target grasslands based on the initial total amount of CO2 absorbed by grasslands and the total amount of CO2 absorbed by grasslands.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to an assessment and processing method for grassland carbon sinks. Background Art

[0002] Carbon sinks are fundamental to addressing climate change and achieving high-quality economic and social development. They are also one of the most economical means to achieve the vision of "carbon neutrality." Carbon sinks are the natural chain in which various natural elements rely on each other to realize the carbon cycle. They are also the main way of carbon cycle and carbon removal in nature. They are mainly used to describe the amount of carbon dioxide absorbed and stored by ecosystems such as forests, oceans, soils, and permafrost, or the ability and efficiency of forests, oceans, and soils to absorb and store carbon dioxide. Carbon sinks are a process, activity, and mechanism that uses plant (organism) photosynthesis or biological pumps to absorb and remove carbon dioxide from the atmosphere and fix it in vegetation, the deep sea, and soil through measures such as afforestation, marine conservation, and sea area remediation and restoration, thereby reducing or lowering the concentration of greenhouse gases in the atmosphere. Depending on the specific carrier and type, carbon sinks can generally be divided into terrestrial ecosystem carbon sinks and marine ecosystem carbon sinks.

[0003] How to improve the calculation accuracy of grassland carbon sinks has become an urgent problem that needs to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a grassland carbon sink assessment and processing method to address the defects of the existing technology and solve the problems existing in the existing technology.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a method for assessing and processing grassland carbon sequestration, comprising:

[0006] The vegetation of the selected quadrats was processed to determine the annual net growth biomass of grasses and the average carbon content of grasses;

[0007] According to E r =M g ×f g ×k to calculate the initial total annual CO2 absorption of grassland; where E r is the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0008] Determine the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, maximum daily photosynthesis rate, air pressure value under the influence of soil and moisture, average photosynthesis rate of leaf area and the preset photosynthesis model;

[0009] The total autotrophic respiratory consumption of vegetation is calculated based on the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots, as well as the growth respiratory consumption of vegetation;

[0010] Calculate the total amount of vegetation litter based on the total autotrophic respiration consumption of vegetation;

[0011] Calculate the total amount of gas released by microbial decomposition;

[0012] The total annual CO2 absorption of grassland is calculated based on the maximum daily photosynthesis rate, the total autotrophic respiratory consumption of vegetation, the total amount of vegetation litter and the total amount of gas released by microbial decomposition;

[0013] The target annual total amount of CO2 absorbed by grassland is calculated based on the initial annual total amount of CO2 absorbed by grassland and the annual total amount of CO2 absorbed by grassland.

[0014] In a possible implementation, processing the selected sample vegetation to determine the annual net growth biomass of grasses and the average carbon content of grasses specifically includes:

[0015] All plants in the quadrat were harvested;

[0016] The above-ground and root parts of the plants were weighed separately to obtain the fresh weight;

[0017] The above-ground part and the root part are respectively fixed at a first preset temperature for a preset time, and then dried at a second preset temperature to obtain the dry weight;

[0018] The soil of the sample was naturally air-dried and then ground and passed through 20-mesh and 100-mesh nylon sieves respectively, and then stored for testing.

[0019] The bulk density of soil was determined using the ring knife method;

[0020] The content of physical clay in the soil was determined according to Kaczynski's simple classification of soil texture;

[0021] The organic matter in the soil was determined by the potassium dichromate-sulfuric acid external heating oxidation method;

[0022] The amount of organic carbon was calculated based on the amount of potassium dichromate consumed;

[0023] The organic matter content is calculated based on the organic carbon content, and the carbon content is calculated based on the organic matter content;

[0024] Plant carbon storage was calculated using organic matter content and plant dry weight after drying.

[0025] In one possible implementation, the calculation of plant carbon storage using organic matter content and plant dry weight after drying specifically includes:

[0026] Plant carbon storage was calculated based on the product of plant carbon content and plant dry weight;

[0027] Soil carbon storage was calculated based on the product of soil carbon density and soil carbon density per soil area.

[0028] In one possible implementation, determining the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, the maximum daily photosynthesis rate, the air pressure value under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model specifically includes:

[0029] According to V j =V max f(T min )f(ω) calculates the maximum daily photosynthesis rate under the influence of temperature and air temperature; where, P=V j ·LAI·δD,V j is the maximum daily photosynthesis rate affected by temperature and air temperature; V max is the maximum rate of photosynthesis when temperature and precipitation conditions reach the most ideal state, which is 7.5 for C4 and 6.0 for shrubs respectively; T min is the daily minimum temperature; ω is the air pressure value under the influence of soil and moisture; V n is the average photosynthesis rate of leaf area; LA I is the leaf area index; β is the vegetation canopy extinction coefficient; is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after removing the autotrophic respiration and heterotrophic respiration of vegetation; D is the duration of sunlight; δ is the ratio of the maximum photosynthesis time to the total sunlight duration.

[0030] In a possible implementation, the calculation of the total autotrophic respiratory consumption of vegetation based on the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots, as well as the growth respiratory consumption of vegetation, specifically includes:

[0031] according to Calculate the total autotrophic respiration consumption of vegetation;

[0032] in, R g =r g (GPP), Rs is the total autotrophic respiratory consumption of vegetation; Rx,i represents the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots; R g Vegetation growth respiratory consumption; M i is the biomass of each component of vegetation; r i is the maintenance respiratory coefficient; T 10 Represents temperature factor; T a 、T b are air temperature and root surface temperature respectively; rg is the growth respiration coefficient of each component of vegetation.

[0033] In a possible implementation, calculating the total amount of vegetation litter based on the total autotrophic respiration consumption of the vegetation specifically includes:

[0034] according to Total amount of vegetation loss;

[0035] Where L is the organic matter scattered by vegetation into the soil; Q is the total carbon storage of vegetation; R l 、R r 、R s Respectively represent the proportion of leaves, roots and stems in the total vegetation carbon; t l , t r , t s Represent the average survival time of vegetation leaves, roots and stems respectively.

[0036] In one possible implementation, calculating the total amount of gas released by microbial decomposition specifically includes:

[0037] according to Calculate the total amount of gas released by microbial decomposition;

[0038] Among them, R h is the total amount of gas released by microbial decomposition; k i is the maximum decomposition rate of microorganisms; L c is the effect of lignin content; A is the effect of soil moisture and temperature; C i is carbon storage; T m is the effect of soil on soil organic matter transformation; i = 1…8 represents surface structure, soil structure, active organic matter, microorganisms, surface metabolites, soil metabolites, organic matter slow decomposition weight and organic matter passive decomposition weight, respectively.

[0039] In one possible implementation, the calculation of the total annual CO2 absorption by grassland based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition specifically includes:

[0040] The total annual CO2 absorption of grassland was calculated by combining the maximum daily photosynthesis rate, the total autotrophic respiratory consumption of vegetation, the total amount of vegetation litter, the total amount of gas released by microbial decomposition and the preset BIOME-BGC.

[0041] In a possible implementation, calculating the target annual total CO2 absorption amount of grassland based on the initial annual total CO2 absorption amount of grassland and the annual total CO2 absorption amount of grassland specifically includes:

[0042] The initial total amount of CO2 absorbed by the grassland in a year and the weight value of the total amount of CO2 absorbed by the grassland in a year are set according to the latitude and longitude positions; or,

[0043] According to historical climate parameters, the initial total amount of CO2 absorbed by the grassland in an annual manner and the weight value of the total amount of CO2 absorbed by the grassland in an annual manner are set respectively;

[0044] According to the weight value of the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually, the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually are weighted to obtain the target total amount of CO2 absorbed by the grassland annually.

[0045] In a second aspect, the present invention provides a grassland carbon sink assessment and processing device, the device comprising:

[0046] a first determination module, the first determination module being used to process the vegetation of the selected sample plot to determine the annual net growth biomass of grasses and the average carbon content of grasses;

[0047] The first calculation module is used to calculate the r =M g ×f g ×k to calculate the initial total annual CO2 absorption of grassland; where E r is the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0048] a second determination module, configured to determine the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, the maximum daily photosynthesis rate, air pressure under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model;

[0049] A second calculation module is used to calculate the total autotrophic respiratory consumption of vegetation based on the maintenance respiratory consumption of vegetation leaves, stems, thick roots and fine roots, as well as the growth respiratory consumption of vegetation;

[0050] A third calculation module, the third calculation module is used to calculate the total amount of vegetation litter according to the total autotrophic respiration consumption of the vegetation;

[0051] a fourth calculation module, the fourth calculation module being used to calculate the total amount of gas released by microbial decomposition;

[0052] a fifth calculation module, configured to calculate the total annual CO2 absorption of the grassland based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of the vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition;

[0053] The sixth calculation module is used to calculate the target annual total amount of CO2 absorbed by grassland based on the initial annual total amount of CO2 absorbed by grassland and the annual total amount of CO2 absorbed by grassland.

[0054] By applying the grassland carbon sink assessment and processing method provided in an embodiment of the present invention, the target value of the annual total CO2 absorption by grassland can be calculated based on the initial annual total CO2 absorption by grassland and the weighted fusion of the annual total CO2 absorption by grassland, thereby improving the calculation accuracy of grassland carbon sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic flow chart of a grassland carbon sequestration assessment and processing method provided in Example 1 of the present invention;

[0056] Figure 2 for Figure 1 Specific flow chart of step 110;

[0057] Figure 3 This is a schematic diagram of the structure of the grassland carbon sink assessment and processing device provided in Example 2 of the invention. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0059] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0060] Figure 1 This is a flow chart of the grassland carbon sink assessment and processing method provided by the embodiment of the present invention. Figure 1 , the technical solution of the present invention is described with specific embodiments.

[0061] Step 110 , processing the vegetation of the selected quadrats to determine the annual net growth biomass of grasses and the average carbon content of grasses;

[0062] Among them, Figure 2 As shown, step 110 includes the following steps:

[0063] Step 101, adopting a complete harvesting method to process the plants in the sample plot;

[0064] Step 102, weighing the above-ground part and the root part of the plant separately to obtain the fresh weight;

[0065] Step 103, withering the aboveground part and the root part at a first preset temperature for a preset time, and then drying at a second preset temperature to obtain a dry weight;

[0066] Step 104: Grind the soil from the sample after natural air drying, pass it through 20-mesh and 100-mesh nylon sieves, and store it for testing;

[0067] Step 105, measuring the bulk density of the soil using the ring knife method;

[0068] Step 106, determining the content of soil physical clay particles according to Kaczynski's simplified soil texture classification method;

[0069] Step 107, determining the organic matter content of the soil using a potassium dichromate-sulfuric acid external heating oxidation method;

[0070] Step 108, calculating the amount of organic carbon based on the amount of potassium dichromate consumed;

[0071] Step 109, calculating the organic matter content based on the organic carbon content, thereby calculating the carbon content based on the organic matter content; and calculating the plant carbon storage using the organic matter content and the plant dry weight after drying.

[0072] Among them, the calculation of plant carbon storage using organic matter content and plant dry weight after drying includes:

[0073] Plant carbon storage was calculated based on the product of plant carbon content and plant dry weight;

[0074] Soil carbon storage was calculated based on the product of soil carbon density and soil carbon density per soil area.

[0075] Combine Figure 2Steps 101-109 are summarized as follows: Samples of vegetation and soil from the depth of 0-20 cm in the selected plots were surveyed for biomass, carbon content, carbon density, and carbon storage. Plants in each plot were harvested completely (including roots), and the aboveground and root parts were separated and weighed for fresh weight. Aboveground and root samples were taken at a pre-set temperature of 105°C for 30 minutes, then dried at a pre-set temperature of 80°C to constant weight. Dry weights were then calculated, and the existing biomass per unit area of grassland was calculated. Soil samples from the depth of 0-20 cm were air-dried, ground, and passed through 20- and 100-mesh nylon sieves, respectively, and stored for testing. Soil bulk density was determined using the ring knife method. Soil physical clay content (<0.01 mm) was determined using Kaczynski's simplified soil texture classification method. Organic matter content was determined using the potassium dichromate-sulfuric acid external thermal oxidation method. The amount of organic carbon was calculated based on the amount of potassium dichromate consumed. Since 1 gram of carbon is approximately equal to 1.724 grams of organic matter, the carbon content was calculated. The plant carbon storage was calculated using the measured plant organic matter content per unit and the plant dry weight after drying. The formulas for soil carbon content, carbon density, and carbon storage are as follows (Yang et al., 2014):

[0076] Carbon content (g / kg) = organic matter ÷ 1.724 (1);

[0077] Plant carbon storage (kg / m 2 ) = plant carbon content × plant dry weight;

[0078] Soil carbon density (kg / m 2 )=C i ×D i ×Ei(1-G i )×10 -2 (3);

[0079] Soil carbon storage (kg / m 2 ) = soil carbon density × soil area (Shui et al., 2016).

[0080] Where: C i is the soil carbon content (g / kg); D i Soil bulk density (g / cm -3 );E i is the soil layer thickness (cm); G i It is the volume percentage of gravel with a diameter greater than 2 mm in the soil.

[0081] Step 120, according to E r =M g ×f g ×k to calculate the initial total annual CO2 absorption of grassland; where E ris the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0082] Here, k is an empirical value obtained through multiple experiments, for example, 44 / 12. Thus, after step 120, an estimated value of grassland carbon sink can be obtained.

[0083] The following steps 130-170 describe how to estimate the annual CO2 absorption of grassland using the annual net growth of grassland vegetation biomass.

[0084] Step 130, determining the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, the maximum daily photosynthesis rate, the atmospheric pressure value under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model;

[0085] Specifically, according to V j =V max f(T min )f(ω) calculates the maximum daily photosynthesis rate under the influence of temperature and air temperature; according to Calculate the average photosynthesis rate per leaf area according to P=V j ·LAI·δD is used to calculate the net photosynthesis of vegetation after removing autotrophic respiration and heterotrophic respiration; V j is the maximum daily photosynthesis rate affected by temperature and air temperature; V max is the maximum rate of photosynthesis when temperature and precipitation conditions reach the most ideal state, which is 7.5 for C4 and 6.0 for shrubs respectively; T min is the daily minimum temperature; ω is the air pressure value under the influence of soil and moisture; V n is the average photosynthesis rate of leaf area; LAI is the leaf area index; β is the vegetation canopy extinction coefficient; is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after removing the autotrophic respiration and heterotrophic respiration of vegetation; D is the duration of sunlight; δ is the ratio of the maximum photosynthesis time to the total sunlight duration.

[0086] Among them, V j =V max f(T min )f(ω), and P = V j LAI·δD is a preset photosynthesis model. Among them, known parameters such as temperature, air pressure, sunshine duration, and the ratio of sunshine duration to effective radiation can be collected by sensors or obtained by processing sensor data.

[0087] Step 140, calculating the total autotrophic respiratory consumption of the vegetation based on the maintenance respiratory consumption of the vegetation leaves, stems, coarse roots and fine roots, as well as the growth respiratory consumption of the vegetation;

[0088] Specifically, according to Calculate the total autotrophic respiration consumption of vegetation;

[0089] according to Calculate the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots;

[0090] According to R g =r g (GPP) calculates vegetation growth respiratory consumption;

[0091] Among them, R s is the total autotrophic respiration consumption of vegetation; R x，i Indicates the maintenance respiratory consumption of vegetation leaves, stems, thick roots and fine roots; R g Vegetation growth respiratory consumption; M i is the biomass of each component of vegetation; r i is the maintenance respiratory coefficient; T 10 Represents temperature factor; T a 、T b are air temperature and root surface temperature respectively; r g is the growth respiration coefficient of each component of vegetation. Among them, the biomass of each component, the maintenance respiration coefficient, the temperature factor, the air temperature and the root surface temperature, and the growth respiration coefficient of each component can be collected by sensors or obtained by processing the sensor data.

[0092] Step 150, calculating the total amount of vegetation litter based on the total autotrophic respiration consumption of the vegetation;

[0093] Specifically, according to Total amount of vegetation loss;

[0094] Where L is the organic matter scattered by vegetation into the soil; Q is the total carbon storage of vegetation; R l 、R r 、R s Respectively represent the proportion of leaves, roots and stems in the total vegetation carbon; t l , t r , t s Represents the average survival time of vegetation leaves, roots, and stems, respectively. The total vegetation carbon storage, the proportion of leaves, roots, and stems to the total vegetation carbon, and the average survival time of vegetation leaves, roots, and stems are all known parameters, which can be obtained through sensor data or processor processing, and are not detailed in this application.

[0095] Step 160, calculating the total amount of gas released by microbial decomposition;

[0096] Specifically, step 170 includes: Calculate the total amount of gas released by microbial decomposition;

[0097] Among them, R h is the total amount of gas released by microbial decomposition; k i is the maximum decomposition rate of microorganisms; L c is the effect of lignin content; A is the effect of soil moisture and temperature; C i is carbon storage; T m is the effect of soil on soil organic matter conversion; i = 1…8 represents surface structure, soil structure, active organic matter, microorganisms, surface metabolites, soil metabolites, slow organic matter decomposition weight, and passive organic matter decomposition weight, respectively. The maximum microbial decomposition rate, the influence of lignin content, the effects of soil moisture and temperature, carbon storage, and the effect of soil on soil organic matter conversion are obtained through sensor acquisition or processor processing and are not detailed in this application.

[0098] Step 170, calculating the total annual CO2 absorption by the grassland based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of the vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition;

[0099] Specifically, the total amount of CO2 absorbed by grassland in an year is calculated by combining the daily maximum photosynthesis rate, the total autotrophic respiratory consumption of vegetation, the total amount of vegetation litter, the total amount of gas released by microbial decomposition and the preset BIOME-BGC.

[0100] Step 180 : Calculate the target annual total amount of CO 2 absorbed by grassland based on the initial annual total amount of CO 2 absorbed by grassland and the annual total amount of CO 2 absorbed by grassland.

[0101] Specifically, the initial total annual CO2 absorption amount of the grassland calculated in step 120 and the total annual CO2 absorption amount of the grassland calculated according to BIOME-BGC are weighted to obtain the total annual CO2 absorption amount of the grassland.

[0102] As for the weighting coefficients for each item during weighting, they can be processed based on the current location. For example, a weighting coefficient corresponding to each location can be preset and stored in a database, thereby obtaining the total amount of CO2 absorbed by the grassland annually. The weighting coefficients can be set based on the historical climate parameters of each location, or they can be set based on longitude and latitude. For example, each longitude and latitude interval corresponds to a weighting coefficient, or each annual rainfall interval corresponds to a weighting coefficient, thereby facilitating the calculation of the total amount of CO2 absorbed by the grassland annually.

[0103] By applying the grassland carbon sink assessment and processing method provided in an embodiment of the present invention, the target value of the annual total CO2 absorption by grassland can be calculated based on the initial annual total CO2 absorption by grassland and the weighted fusion of the annual total CO2 absorption by grassland, thereby improving the calculation accuracy of grassland carbon sink.

[0104] Example 2

[0105] The second embodiment of the present invention provides a schematic diagram of a grassland carbon sink assessment and processing device. Figure 3 As shown, the apparatus includes: a first determination module 310 , a first calculation module 320 , a second determination module 330 , a second calculation module 340 , a third calculation module 350 , a fourth calculation module 360 , a fifth calculation module 370 and a sixth calculation module 380 .

[0106] The first determination module 310 is used to process the vegetation of the selected sample plot to determine the annual net growth biomass of grasses and the average carbon content of grasses;

[0107] The first calculation module 320 is used to calculate the r =M g ×f g ×k to calculate the initial total annual CO2 absorption of grassland; where E r is the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0108] The second determination module 330 is used to determine the maximum daily photosynthesis rate under the influence of temperature and air temperature based on the air temperature, precipitation, the maximum daily photosynthesis rate, the air pressure value under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model;

[0109] The second calculation module 340 is used to calculate the total autotrophic respiratory consumption of vegetation based on the maintenance respiratory consumption of vegetation leaves, stems, thick roots and fine roots, as well as the growth respiratory consumption of vegetation;

[0110] The third calculation module 350 is used to calculate the total amount of vegetation litter according to the total autotrophic respiration consumption of the vegetation;

[0111] The fourth calculation module 360 is used to calculate the total amount of gas released by microbial decomposition;

[0112] The fifth calculation module 370 is used to calculate the total annual CO2 absorption of the grassland based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of the vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition;

[0113] The sixth calculation module 380 is used to calculate the target annual total amount of CO2 absorbed by grassland based on the initial annual total amount of CO2 absorbed by grassland and the annual total amount of CO2 absorbed by grassland.

[0114] Professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0115] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0116] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for evaluating and processing grassland carbon sinks, characterized in that: The method comprises: The vegetation of the selected quadrats was processed to determine the annual net growth biomass of grasses and the average carbon content of grasses; according to Calculate the initial total annual CO2 absorption of grassland; where E r is the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2; Determine the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, maximum daily photosynthesis rate, air pressure value under the influence of soil and moisture, average photosynthesis rate of leaf area and the preset photosynthesis model; The total autotrophic respiratory consumption of vegetation is calculated based on the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots, as well as the growth respiratory consumption of vegetation; Calculate the total amount of vegetation litter based on the total autotrophic respiration consumption of vegetation; Calculate the total amount of gas released by microbial decomposition; The total annual CO2 absorption of grassland is calculated based on the maximum daily photosynthesis rate, the total autotrophic respiratory consumption of vegetation, the total amount of vegetation litter and the total amount of gas released by microbial decomposition; Calculating the total annual CO2 absorption of the target grassland based on the initial total annual CO2 absorption of the grassland and the total annual CO2 absorption of the grassland; The step of calculating the target annual total CO2 absorption amount of grassland based on the initial annual total CO2 absorption amount of grassland and the annual total CO2 absorption amount of grassland specifically includes: The initial total amount of CO2 absorbed by the grassland in a year and the weight value of the total amount of CO2 absorbed by the grassland in a year are set according to the latitude and longitude positions; or, According to historical climate parameters, the initial total amount of CO2 absorbed by the grassland in an annual manner and the weight value of the total amount of CO2 absorbed by the grassland in an annual manner are set respectively; According to the weight value of the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually, the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually are weighted to obtain the target total amount of CO2 absorbed by the grassland annually.

2. The method according to claim 1, characterized in that The processing of the selected sample vegetation to determine the annual net growth biomass of grasses and the average carbon content of grasses specifically includes: All plants in the quadrat were harvested; The above-ground and root parts of the plants were weighed separately to obtain the fresh weight; The above-ground part and the root part are respectively fixed at a first preset temperature for a preset time, and then dried at a second preset temperature to obtain the dry weight; The soil of the sample was naturally air-dried and then ground and passed through 20-mesh and 100-mesh nylon sieves respectively, and then stored for testing. The bulk density of soil was determined using the ring knife method; The content of physical clay in the soil was determined according to Kaczynski's simple classification of soil texture; The organic matter in the soil was determined by the potassium dichromate-sulfuric acid external heating oxidation method; The amount of organic carbon was calculated based on the amount of potassium dichromate consumed; The organic matter content is calculated based on the organic carbon content, and the carbon content is calculated based on the organic matter content; Plant carbon storage was calculated using organic matter content and plant dry weight after drying.

3. The method according to claim 2, characterized in that The calculation of plant carbon storage using organic matter content and plant dry weight after drying specifically includes: Plant carbon storage was calculated based on the product of plant carbon content and plant dry weight; Soil carbon storage was calculated based on the product of soil carbon density and soil carbon density per soil area.

4. The method according to claim 1, wherein Determining the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, maximum daily photosynthesis rate, air pressure value under the influence of soil and moisture, average photosynthesis rate of leaf area, and a preset photosynthesis model specifically includes: according to Calculate the maximum daily photosynthesis rate under the influence of temperature and air temperature; where, , , V j is the maximum daily photosynthesis rate affected by temperature and air temperature; V max is the maximum rate of photosynthesis when temperature and precipitation conditions reach the most ideal state, which is 7.5 for C4 and 6.0 for shrubs respectively; T min is the daily minimum temperature; ω is the air pressure value under the influence of soil and moisture; V n is the average photosynthesis rate of leaf area; LAI is the leaf area index; β is the vegetation canopy extinction coefficient; ∂ is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after deducting the autotrophic and heterotrophic respiration of vegetation; D is the duration of sunlight; δ is the ratio of the maximum photosynthesis time to the total sunlight duration.

5. The method according to claim 1, wherein The calculation of the total autotrophic respiratory consumption of vegetation based on the maintenance respiratory consumption of vegetation leaves, stems, coarse roots and fine roots, as well as the growth respiratory consumption of vegetation, specifically includes: according to Calculate the total autotrophic respiration consumption of vegetation; in, , , R s is the total autotrophic respiration consumption of vegetation; R x，i Indicates the maintenance respiratory consumption of vegetation leaves, stems, thick roots and fine roots; R g Vegetation growth respiratory consumption; M i is the biomass of each component of vegetation; r i is the maintenance respiratory coefficient; T 10 Represents temperature factor; T a 、T b are air temperature and root surface temperature respectively; r g is the growth respiration coefficient of each component of vegetation.

6. The method according to claim 1, characterized in that Calculating the total amount of vegetation litter based on the total autotrophic respiration consumption of vegetation specifically includes: according to Total amount of vegetation loss; Where L is the organic matter scattered by vegetation into the soil; Q is the total carbon storage of vegetation; R l 、R r 、R s Respectively represent the proportion of leaves, roots and stems in the total vegetation carbon; t l , t r , t s Represent the average survival time of vegetation leaves, roots and stems respectively.

7. The method according to claim 1, characterized in that The calculation of the total amount of gas released by microbial decomposition specifically includes: according to Calculate the total amount of gas released by microbial decomposition; Among them, R h is the total amount of gas released by microbial decomposition; k i is the maximum decomposition rate of microorganisms; L c is the effect of lignin content; A is the effect of soil moisture and temperature; C i is carbon storage; T m is the effect of soil on soil organic matter transformation; i = 1…8 represents surface structure, soil structure, active organic matter, microorganisms, surface metabolites, soil metabolites, organic matter slow decomposition weight and organic matter passive decomposition weight, respectively.

8. The method according to claim 1, characterized in that Calculating the total annual CO2 absorption by grassland based on the maximum daily photosynthesis rate, the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition specifically includes: The total amount of CO2 absorbed by the grassland in an year is calculated by combining the maximum daily photosynthesis rate, the total autotrophic respiratory consumption of vegetation, the total amount of vegetation litter, the total amount of gas released by microbial decomposition and the preset BIOME-BGC.

9. A grassland carbon sink assessment and processing device, characterized in that: The device comprises: a first determination module, the first determination module being used to process the vegetation of the selected sample plot to determine the annual net growth biomass of grasses and the average carbon content of grasses; A first calculation module is used to Calculate the initial total annual CO2 absorption of grassland; where E r is the total amount of CO2 absorbed by grassland in a year, M g is the annual net growth biomass of grasses, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2; a second determination module, configured to determine the maximum daily photosynthesis rate under the influence of temperature and air temperature based on air temperature, precipitation, the maximum daily photosynthesis rate, air pressure under the influence of soil and moisture, the average photosynthesis rate of leaf area, and a preset photosynthesis model; A second calculation module is used to calculate the total autotrophic respiratory consumption of vegetation based on the maintenance respiratory consumption of vegetation leaves, stems, thick roots and fine roots, as well as the growth respiratory consumption of vegetation; A third calculation module, the third calculation module is used to calculate the total amount of vegetation litter according to the total autotrophic respiration consumption of the vegetation; a fourth calculation module, the fourth calculation module being used to calculate the total amount of gas released by microbial decomposition; a fifth calculation module, configured to calculate the total annual CO2 absorption of the grassland based on the daily maximum photosynthesis rate, the total autotrophic respiration consumption of the vegetation, the total amount of vegetation litter, and the total amount of gas released by microbial decomposition; a sixth calculation module, configured to calculate a target annual total CO2 absorption amount of grassland based on the initial annual total CO2 absorption amount of grassland and the annual total CO2 absorption amount of grassland; The sixth calculation module calculates the target annual total CO2 absorption amount of grassland based on the initial annual total CO2 absorption amount of grassland and the annual total CO2 absorption amount of grassland, specifically including: The initial total amount of CO2 absorbed by the grassland in a year and the weight value of the total amount of CO2 absorbed by the grassland in a year are set according to the latitude and longitude positions; or, According to historical climate parameters, the initial total amount of CO2 absorbed by the grassland in an annual manner and the weight value of the total amount of CO2 absorbed by the grassland in an annual manner are set respectively; According to the weight value of the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually, the initial total amount of CO2 absorbed by the grassland annually and the weight value of the total amount of CO2 absorbed by the grassland annually are weighted to obtain the target total amount of CO2 absorbed by the grassland annually.

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