Grassland carbon sink evaluation processing method

Abstract

The embodiment of the invention relates to a grassland carbon sink evaluation processing method, which comprises the following steps: processing vegetation of a selected quadrat, determining annual net growth biomass of grass and average carbon content of the grass, and calculating initial total amount of annual absorbed CO2 of the grassland; according to the air temperature, the rainfall, the daily maximum photosynthesis rate, the air pressure value under the influence of the soil and the moisture, the leaf area average photosynthesis rate and a preset photosynthesis model, determining the daily maximum photosynthesis rate under the influence of the temperature and the air temperature; calculating the total vegetation litter amount according to the total vegetation autotrophic respiration consumption; calculating the total amount of gas released by microbial decomposition; according to the daily maximum photosynthesis rate, the vegetation total autotrophic respiration consumption, the vegetation litter total amount and the total amount of gas released by microbial decomposition, the total amount of CO2 absorbed by the grassland per year is calculated; and according to the initial total amount of annual CO2 absorbed by the grassland and the total amount of annual CO2 absorbed by the grassland, calculating the total amount of annual CO2 absorbed by the target

Description

Technical Field

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

[0002] Carbon sink is the basic work for addressing climate change and achieving high-quality economic and social development. It is also one of the most economical means to achieve the vision and goal of "carbon neutrality". Carbon sink is a natural chain in which various natural elements are interdependent to realize carbon cycle. It is also the main way of carbon cycle and carbon removal in nature. It is 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, soils and other ecosystems to absorb and store carbon dioxide. Carbon sink is 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, 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 in view of the defects in the prior art, so as to solve the problems in the prior art.

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

[0006] The vegetation of the selected sample plots 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 grass, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0008] According to air temperature, precipitation, daily maximum photosynthesis rate, air pressure value under the influence of soil and water, average photosynthesis rate of leaf area and preset photosynthesis model, the daily maximum photosynthesis rate under the influence of temperature and air temperature is determined;

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

[0010] According to the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter is calculated;

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

[0012] The total amount of CO2 absorbed by the grassland in a year is calculated based on the maximum daily 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;

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

[0014] In a possible implementation, 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:

[0015] All plants in the plot 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 sterilized at a first preset temperature for a preset time, and then dried at a second preset temperature to obtain a dry weight;

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

[0019] The bulk density of soil was determined using the knife ring 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 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 from the organic carbon content, and the carbon content is calculated from the organic matter content;

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

[0025] In a 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 a possible implementation, 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:

[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 extinction coefficient of vegetation canopy; is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after removing autotrophic respiration and heterotrophic respiration of vegetation; D is the duration of sunshine; δ is the proportion of maximum photosynthesis time to total sunshine duration.

[0030] In a possible implementation, the calculation of the total autotrophic respiration consumption of vegetation based on the maintenance respiration consumption of the four parts of the vegetation leaves, stems, thick roots and fine roots, and the growth respiration consumption of the 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 respiration consumption of vegetation; Rx,i represents the maintenance respiration 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 breathing coefficient; T 10 Represents temperature factor; T a , T b represent the air temperature and the root surface temperature respectively; rg is the growth respiration coefficient of each component of vegetation.

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

[0034] according to Total 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 Respectively represent the average survival time of vegetation leaves, roots and stems.

[0036] In a possible implementation, the 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 influence of lignin content; A is the influence of soil moisture and temperature; C is the influence of soil moisture and temperature; i is carbon storage; T m is the influence of soil on soil organic matter conversion; 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 a possible implementation, the calculation of the total amount of CO2 absorbed by the grassland in an annual manner according to the maximum daily 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 specifically includes:

[0040] The total amount of CO2 absorbed by the grassland in an year is calculated by combining the daily maximum photosynthesis rate, the total autotrophic respiration 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, the calculating the total annual CO2 absorption of the target grassland according to the initial total annual CO2 absorption of the grassland and the total annual CO2 absorption of the 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 respectively set;

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

[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 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;

[0047] A first calculation module, 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 grass, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

[0048] A second determination module, the second determination module is used to determine the maximum daily photosynthesis rate under the influence of temperature and air temperature according to 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;

[0049] A second calculation module, the second calculation module is used to calculate the total autotrophic respiration consumption of vegetation according to the maintenance respiration consumption of four parts of vegetation leaves, stems, thick roots and fine roots, and the growth respiration 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 is used to calculate the total amount of gas released by microbial decomposition;

[0052] A fifth calculation module, the fifth calculation module is used to calculate the total amount of CO2 absorbed by the grassland in an year according to the maximum daily 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 total annual CO2 absorption of the target grassland according to the initial total annual CO2 absorption of the grassland and the total annual CO2 absorption of the 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 diagram of a process flow of a grassland carbon sink assessment and processing method provided in Embodiment 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 a grassland carbon sink assessment and processing device provided in Embodiment 2 of the invention. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 A schematic diagram of a process flow for evaluating and processing grassland carbon sinks provided by an embodiment of the present invention is shown below in conjunction with Figure 1 , the technical solution of the present invention is described with specific embodiments.

[0061] Step 110, processing the vegetation of the selected sample plot 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, using 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 respectively to obtain the fresh weight;

[0065] Step 103, the above-ground part and the root part are respectively sterilized at a first preset temperature for a preset time, and then dried at a second preset temperature to obtain a dry weight;

[0066] Step 104, the soil of the sample is naturally air-dried and then ground and passed through 20-mesh and 100-mesh nylon sieves respectively, and stored 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 simple soil texture classification method;

[0069] Step 107, determining the organic matter in the soil by 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 according to the organic carbon content, thereby calculating the carbon content according to the organic matter content; using the organic matter content and the dry weight of the plant after drying, calculate the plant carbon storage.

[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] Combination Figure 2, summarize steps 101-109: survey the vegetation and 0-20cm soil samples of the selected sample plots, including biomass, carbon content, carbon density and carbon storage. The plants of each sample plot were harvested by the whole harvest method (with the root system), and the aboveground parts and roots were separated and weighed for fresh weight. The aboveground parts and root samples were taken at the first preset temperature of 105° for 30 minutes, and then dried at the second preset temperature of 80°C to constant weight, and the dry weight was calculated, and then the existing biomass per unit area of ​​grassland was calculated. The 0-20cm soil samples were naturally air-dried and ground, and passed through 20 mesh and 100 mesh nylon sieves respectively, and stored for testing. The bulk density of the soil was determined by the ring knife method; the content of physical clay particles (<0.01mm) in the soil was determined according to Kaczynski's simple soil texture classification method; the organic matter of the sample was determined by potassium dichromate-sulfuric acid external heating oxidation method. The amount of organic carbon was calculated based on the amount of potassium dichromate consumed. Since 1g of carbon is approximately equal to 1.724g of organic matter, the carbon content was calculated. The plant carbon storage was calculated using the unit plant organic matter content measured in the sample and the dry weight of the plant 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 soil carbon content (g / kg); D i is the 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 grass, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2;

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

[0083] The following steps 130-170 are about how to estimate the annual CO2 absorption of grassland through 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 according to 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;

[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 extinction coefficient of vegetation canopy; is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after removing autotrophic respiration and heterotrophic respiration of vegetation; D is the duration of sunshine; δ is the proportion of maximum photosynthesis time to total sunshine 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 parameters, air pressure value, sunshine duration, and effective radiation ratio of sunshine duration can be collected by sensors or obtained after processing the sensor data.

[0087] Step 140, calculating the total autotrophic respiration consumption of the vegetation according to the maintenance respiration consumption of the leaves, stems, thick roots and fine roots of the vegetation and the growth respiration consumption of the vegetation;

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

[0089] according to Calculate the maintenance respiration consumption of vegetation leaves, stems, thick 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 Represents the maintenance respiration consumption of leaves, stems, thick roots and fine roots of vegetation; R g Vegetation growth respiratory consumption; M i is the biomass of each component of vegetation; r i is the maintenance breathing coefficient; T 10 Represents temperature factor; T a 、T b represent the air temperature and the root surface temperature respectively; r g It 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 after processing the sensor data.

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

[0093] Specifically, according to Total 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 Respectively represent the average survival time of vegetation leaves, roots, and stems. The total carbon storage of vegetation, the proportion of leaves, roots, and stems in the total carbon storage of vegetation, and the average survival time of vegetation leaves, roots, and stems are all known parameters here, which can be obtained by sensor collection or processor processing, and this application does not elaborate on this.

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

[0096] Specifically, step 170 includes: according to 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 influence of lignin content; A is the influence of soil moisture and temperature; C is the influence of soil moisture and temperature; i is carbon storage; T m is the effect of soil on soil organic matter conversion; i=1…8 respectively represent surface structure, soil structure, active organic matter, microorganisms, surface metabolites, soil metabolites, organic matter slow decomposition weight and organic matter passive decomposition weight. Among them, the maximum decomposition rate of microorganisms, the influence of lignin content, the influence of soil moisture and temperature, carbon storage, and the effect of soil on soil organic matter conversion are obtained by sensor collection or processor processing, and this application does not elaborate on this.

[0098] Step 170, calculating the total amount of CO2 absorbed by the grassland in an annual manner according to the maximum daily 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 respiration 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, calculating 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.

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

[0102] As for the weighting coefficient of each item during weighting, it can be processed according to the current location. For example, the weighting coefficient corresponding to each location can be preset and stored in the database, so as to obtain the total amount of CO2 absorbed by the grassland in an year. The weighting coefficient can be set according to the historical climate parameters of each location, or it can also be set according to the 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, so as to facilitate the calculation of the total amount of CO2 absorbed by the grassland in an year.

[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] Embodiment 2

[0105] Embodiment 2 of the present invention provides a schematic diagram of a grassland carbon sink assessment and processing device. Figure 3 As shown, the device 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 grass, 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 according to 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 respiration consumption of vegetation according to the maintenance respiration consumption of the four parts of vegetation leaves, stems, thick roots and fine roots, and the growth respiration 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 amount of CO2 absorbed by the grassland in an annual manner according to the maximum daily 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 according to the initial annual total amount of CO2 absorbed by grassland and the annual total amount of CO2 absorbed by grassland.

[0114] The professionals should further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. 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 method or algorithm 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 sample plots was processed to determine the annual net growth biomass of grasses and the average carbon content of grasses; 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 grass, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2; According to air temperature, precipitation, daily maximum photosynthesis rate, air pressure value under the influence of soil and water, average photosynthesis rate of leaf area and preset photosynthesis model, the daily maximum photosynthesis rate under the influence of temperature and air temperature is determined; The total autotrophic respiration consumption of vegetation is calculated based on the maintenance respiration consumption of vegetation leaves, stems, thick roots and fine roots, as well as the growth respiration consumption of vegetation. According to the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter is calculated; Calculate the total amount of gas released by microbial decomposition; The total amount of CO2 absorbed by the grassland in a year is calculated based on the maximum daily 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; The target grassland's annual total amount of CO2 absorbed is calculated based on the initial grassland's annual total amount of CO2 absorbed and the grassland's annual total amount of CO2 absorbed.

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 plot 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 sterilized at a first preset temperature for a preset time, and then dried at a second preset temperature to obtain a dry weight; The soil of the sample was naturally air-dried, ground and passed through 20-mesh and 100-mesh nylon sieves respectively, and stored for testing; The bulk density of soil was determined using the knife ring 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 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 from the organic carbon content, and the carbon content is calculated from 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, characterized in that: 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 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; LAI is the leaf area index; β is the extinction coefficient of vegetation canopy; is the quantum yield; PAR is the photosynthetically active radiation; P is the net photosynthesis of vegetation after removing autotrophic respiration and heterotrophic respiration of vegetation; D is the duration of sunshine; δ is the proportion of maximum photosynthesis time to total sunshine duration.

5. The method according to claim 1, characterized in that The calculation of the total autotrophic respiration consumption of vegetation based on the maintenance respiration consumption of vegetation leaves, stems, thick roots and fine roots, as well as the growth respiration consumption of vegetation specifically includes: according to Calculate the total autotrophic respiration consumption of vegetation; in, R g =r g (GPP), R s is the total autotrophic respiration consumption of vegetation; R x，i Represents the maintenance respiration consumption of leaves, stems, thick roots and fine roots of vegetation; R g Vegetation growth respiratory consumption; M i is the biomass of each component of vegetation; r i is the maintenance breathing coefficient; T 10 Represents temperature factor; T a , T b represent the air temperature and the 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 The calculation of the total amount of vegetation litter according to the total autotrophic respiration consumption of vegetation specifically includes: according to Total 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 influence of lignin content; A is the influence of soil moisture and temperature; C is the influence of soil moisture and temperature; i is carbon storage; T m is the influence of soil on soil organic matter conversion; 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 The calculation of the total amount of CO2 absorbed by grassland in an annual amount 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 daily maximum photosynthesis rate, the total autotrophic respiration consumption of vegetation, the total amount of vegetation litter, the total amount of gas released by microbial decomposition and the preset BIOME-BGC.

9. The method according to claim 1, characterized in that: The calculation of the total amount of CO2 absorbed by the target grassland in an annual amount according to the initial total amount of CO2 absorbed by the grassland in an annual amount and the total amount of CO2 absorbed by the grassland in an annual amount 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 respectively set; According to the weight value of the initial total annual CO2 absorption by grassland and the weight value of the total annual CO2 absorption by grassland, the initial total annual CO2 absorption by grassland and the weight value of the total annual CO2 absorption by grassland are weighted to obtain the target total annual CO2 absorption by grassland.

10. A grassland carbon sink assessment and processing device, characterized in that: The device comprises: A first determination module, the first determination module 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; A first calculation module, 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 grass, f g is the average carbon content of grasses, k is the conversion coefficient between C and CO2; A second determination module, the second determination module is used to determine the maximum daily photosynthesis rate under the influence of temperature and air temperature according to 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; A second calculation module, the second calculation module is used to calculate the total autotrophic respiration consumption of vegetation according to the maintenance respiration consumption of four parts of vegetation leaves, stems, thick roots and fine roots, and the growth respiration 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 is used to calculate the total amount of gas released by microbial decomposition; A fifth calculation module, the fifth calculation module is used to calculate the total amount of CO2 absorbed by the grassland in an year according to the maximum daily 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; The sixth calculation module is used to calculate the total annual CO2 absorption of the target grassland according to the initial total annual CO2 absorption of the grassland and the total annual CO2 absorption of the grassland.

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