A method and system for measuring greenhouse gas emissions from natural grassland grazing

Abstract

This invention discloses a method and system for measuring greenhouse gas emissions from natural grassland grazing, comprising: Step 1: determining the amount of CO2 and CH4 absorbed by the grassland, the amount of N2O emitted, the amount of CO2, CH4, and N2O ingested by livestock from intestinal microorganisms, and the amount of CO2, CH4, and N2O emitted from livestock excrement; Step 2: obtaining the annual N2O emissions from natural grassland through long-term monitoring; Step 3: determining the adjustment coefficient using the intuitive grassland cover, and calculating the equivalent of grassland CO2 emissions after converting the grassland N2O emissions; Step 4: calculating the greenhouse gas emissions from livestock using various indicators; Step 5: calculating the total greenhouse gas emissions from natural grassland grazing using the livestock greenhouse gas emissions. This invention provides a precise method for natural grassland grazing systems and dual carbon targets, featuring simplicity, practicality, high accuracy, low cost, strong systematicity, and high speed. It provides a convenient technology for energy conservation and emission reduction in grazing systems, contributing to the sustainable development and utilization of grassland grazing systems.

Description

Technical Field

[0001] This invention relates to the field of greenhouse gas emission measurement, and in particular to a method and system for measuring greenhouse gas emissions from natural grassland grazing. Background Technology

[0002] Over the past century, emissions of the three main greenhouse gases—methane, carbon dioxide, and nitrous oxide—from human activities have contributed to a 0.6°C increase in global surface temperature. With increasing atmospheric greenhouse gas concentrations, global temperatures are projected to rise by 1.5°C over the next 20 years. Global warming threatens agricultural production in many parts of the world, as agriculture accounts for 31% of global greenhouse gas emissions, with emissions increasing by 17% over the past 30 years. Livestock farming accounts for 40% of these emissions. A study by the UN Climate Security Committee indicates that meat is an intensive product, with 36.4 kg of CO2 emitted for every 1 kg of meat produced.

[0003] Research on greenhouse gas emissions primarily focuses on reducing emissions through changes in livestock feeding practices and adjustments to forage structure. For example, replacing concentrates with low-emission forage and adding functional native grasses to forage can reduce greenhouse gas emissions from ruminant livestock. Regarding grazing livestock, some studies reduce greenhouse gas emissions by addressing grassland structure and utilization, while others reduce emissions by increasing the proportion of leguminous forage in natural grasslands. However, these studies only focus on greenhouse gas emissions from livestock or grasslands; a systematic study of greenhouse gas emissions from grazing systems is still lacking.

[0004] Therefore, this invention starts with sheep grazing systems and systematically develops a method for measuring greenhouse gas emissions from grazing grasslands and livestock. It also constructs a measurement system to provide basic data assessment basis and methods for my country's dual-carbon target construction and energy conservation and emission reduction. Summary of the Invention

[0005] In view of this, the present invention provides a method and system for measuring greenhouse gas emissions from grazing on natural grasslands.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for measuring greenhouse gas emissions from grazing on natural grasslands, characterized by comprising the following steps:

[0008] Step 1: Determine the amount of CO2 and CH4 absorbed by the grassland, the amount of N2O emitted, the amount of CO2, CH4 and N2O ingested by livestock intestinal microorganisms, and the amount of CO2, CH4 and N2O emitted by livestock excrement.

[0009] Step 2: Utilize a static chamber and an online greenhouse gas monitoring system for long-term monitoring to obtain the annual N2O emissions from natural grasslands;

[0010] Step 3: Use the intuitive grassland cover as the adjustment coefficient to calculate the grassland CO2 emission equivalent after converting grassland N2O emissions;

[0011] Step 4: Calculate the greenhouse gas emissions from livestock using various indicators;

[0012] Step 5: Calculate the total greenhouse gas emissions from natural grassland grazing based on livestock greenhouse gas emissions values.

[0013] Preferably, in step two, the annual N2O emission of natural grassland ranges from 0.24 to 0.58 kg / ha.

[0014] Preferably, in step two, nitrous oxide emissions and biomass are significantly correlated with coverage.

[0015] Preferably, the specific calculation method in step three is as follows:

[0016] GE N20 =0.425×C+0.155

[0017] GE C02 =298×E N20

[0018] Among them, GE N20 For grassland N2O emissions, GE C02 C represents the grassland CO2 emission equivalent after converting grassland N2O emissions, and C represents grassland cover.

[0019] Preferably, the grassland coverage ranges from 20% to 100%.

[0020] Preferably, in step four, each indicator refers to the fecal fermentation coefficient, the intestinal fermentation coefficient, and the corresponding number of livestock.

[0021] Preferably, in step four, the specific calculation method is as follows:

[0022]

[0023] Wherein, GGEL is the carbon emission from manure fermentation, LFC is the corresponding manure fermentation coefficient, ITFC is the intestinal fermentation coefficient, and N is the corresponding number of livestock; the CH4 and N2O emissions in the coefficients are calculated and converted into CO2 equivalents.

[0024] Preferably, the specific conversion method is as follows: converting CH4 = 25CO2eq and N2O = 298CO2eq into CO2 equivalents.

[0025] Preferably, the specific calculation method in step five is as follows:

[0026] GGEGL=GE C02 +GGEL

[0027] GGEGL represents the total greenhouse gas emissions from grazing on natural grasslands.

[0028] A system for measuring greenhouse gas emissions from grazing on natural grasslands, characterized in that it includes a data acquisition module, a monitoring module, and a calculation module;

[0029] The data acquisition module is used to collect various parameters, including CO2, CH4 and N2O parameters, as well as other parameters required to calculate the total greenhouse gas emissions from natural grassland grazing.

[0030] The monitoring module is used to monitor and obtain the annual N2O emissions from natural grasslands;

[0031] The calculation module is used to calculate the greenhouse gas emissions of livestock and the total greenhouse gas emissions of natural grassland grazing based on all the parameters collected above.

[0032] The present invention achieves the following technical effects compared to the prior art:

[0033] (1) The method of the present invention is simple, low in cost, and highly systematic;

[0034] (2) The method of the present invention has fast judgment speed and high accuracy, providing a convenient technology for energy conservation and emission reduction in grazing systems;

[0035] (3) The method of the present invention helps to maintain the sustainable development and utilization of grassland grazing systems. Attached Figure Description

[0036] Figure 1 This is a flowchart of a method and system for measuring greenhouse gas emissions from grazing on natural grasslands, as described in this invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The method for measuring greenhouse gas emissions from grazing livestock on natural grasslands provided by this invention includes: a method for measuring greenhouse gas emissions from natural grazing land and a method for measuring greenhouse gas emissions from grazing livestock. Based on the greenhouse gas emissions, the amount of greenhouse gas energy conservation and emission reduction in the grazing system is calculated.

[0039] Example 1

[0040] A method for measuring greenhouse gas emissions from grazing on natural grasslands, characterized by comprising the following steps:

[0041] Step 1: Determine the amount of CO2 and CH4 absorbed by the grassland, the amount of N2O emitted, the amount of CO2, CH4 and N2O ingested by livestock intestinal microorganisms, and the amount of CO2, CH4 and N2O emitted by livestock excrement.

[0042] Step 2: Using a static chamber and an online greenhouse gas monitoring system, the annual N2O emissions from natural grasslands were obtained over a long period, ranging from 0.24 to 0.58 kg / ha. Nitrous oxide emissions and biomass were significantly correlated with cover.

[0043] Step 3: Use the intuitive grassland cover as a determining factor to calculate the grassland CO2 emission equivalent after converting grassland N2O emissions; the specific calculation method is as follows:

[0044] GE N20 =0.425×C+0.155

[0045] GE C02 =298×GE N20

[0046] Among them, GE N20 For grassland N2O emissions, GE C02 The grassland CO2 emission equivalent is the conversion of grassland N2O emissions, and C is the grassland cover; the grassland cover ranges from 20% to 100%.

[0047] Step 4: Calculate the greenhouse gas emissions of livestock using the manure fermentation coefficient, gut fermentation coefficient, and corresponding livestock numbers; specific greenhouse gas emission factors for livestock gastrointestinal fermentation and manure management systems are shown in Table 1:

[0048] Table 1:

[0049]

[0050] The specific calculation method is as follows:

[0051]

[0052] Wherein, GGEL is the carbon emission from manure fermentation, LFC is the corresponding manure fermentation coefficient, ITFC is the intestinal fermentation coefficient, and N is the corresponding number of livestock; the CH4 and N2O emissions in the calculation coefficients are converted into CO2 equivalents based on CH4 = 25CO2eq and N2O = 298CO2eq.

[0053] Step 5: Calculate the total greenhouse gas emissions from natural grassland grazing based on livestock greenhouse gas emissions values;

[0054] The specific calculation method is as follows:

[0055] GGEGL=GE C02 +GGEL

[0056] GGEGL represents the total greenhouse gas emissions from grazing on natural grasslands.

[0057] This invention investigates the energy and element flow processes at different stages of ruminant grazing, uses the life cycle method to clarify the characteristics of soil and grass nutrient cycling in grazing areas and various parameters of greenhouse gas emissions during livestock digestion, constructs a model of greenhouse gas emissions or absorption in sheep grazing systems, and clarifies the emissions and absorption of greenhouse gases during sheep grazing, providing a precise method for natural grassland grazing systems and dual carbon targets.

[0058] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for measuring greenhouse gas emissions from grazing on natural grasslands, characterized in that, Includes the following steps: Step 1: Determine the amount of CO2 and CH4 absorbed by the grassland, the amount of N2O emitted, the amount of CO2, CH4 and N2O ingested by livestock intestinal microorganisms, and the amount of CO2, CH4 and N2O emitted by livestock excrement. Step 2: Utilize a static chamber and an online greenhouse gas monitoring system for long-term monitoring to obtain the annual N2O emissions from natural grasslands; Step 3: Use the intuitive grassland cover as the adjustment coefficient to calculate the grassland CO2 emission equivalent after converting grassland N2O emissions; Step 4: Calculate the greenhouse gas emissions from livestock using various indicators; Step 5: Calculate the total greenhouse gas emissions from natural grassland grazing based on livestock greenhouse gas emissions values; In step three, the specific calculation method is as follows: in, The amount of N2O emitted from grassland. , where is the equivalent of grassland CO2 emissions after conversion of grassland N2O emissions, and C is grassland cover; In step four, the indicators refer to the fecal fermentation coefficient, the intestinal fermentation coefficient, and the corresponding number of livestock. The specific greenhouse gas emission factors for livestock and poultry gastrointestinal fermentation and manure management systems are as follows: For beef cattle, the CH4 value from gastrointestinal fermentation is 48 kg / head, the CH4 value from beef cattle manure fermentation is 1 kg / head, and the N2O value from beef cattle manure fermentation is 1.40 kg / head; for sheep, the CH4 value from gastrointestinal fermentation is 5 kg / head, the CH4 value from sheep manure fermentation is 0.16 kg / head, and the N2O value from sheep manure fermentation is 0.33 kg / head; for goats, the CH4 value from gastrointestinal fermentation is 4.6 kg / head, the CH4 value from goat manure fermentation is 0.14 kg / head, and the N2O value from goat manure fermentation is 0.31 kg / head. In step four, the specific calculation method is as follows: Wherein, GGEL is the carbon emission from manure fermentation, LFC is the corresponding manure fermentation coefficient, ITFC is the intestinal fermentation coefficient, and N is the corresponding number of livestock; the CH4 and N2O emissions in the coefficients are calculated and converted into CO2 equivalents.

2. The method for measuring greenhouse gas emissions from grazing on natural grasslands according to claim 1, characterized in that, In step two, the annual N2O emission of natural grassland ranges from 0.24 to 0.58 kg / ha.

3. The method for measuring greenhouse gas emissions from grazing on natural grasslands according to claim 1, characterized in that, In step two, nitrous oxide emissions and biomass are significantly correlated with cover.

4. The method for measuring greenhouse gas emissions from grazing on natural grasslands according to claim 1, characterized in that, The grassland coverage ranges from 20% to 100%.

5. The method for measuring greenhouse gas emissions from grazing on natural grasslands according to claim 1, characterized in that, The specific conversion method is as follows: convert CH4 = 25CO2eq and N2O = 298CO2eq into CO2 equivalents.

6. The method for measuring greenhouse gas emissions from grazing on natural grasslands according to claim 1, characterized in that, In step five, the specific calculation method is as follows: GGEGL represents the total greenhouse gas emissions from grazing on natural grasslands.

7. A system for measuring greenhouse gas emissions from natural grassland grazing, employing the method for measuring greenhouse gas emissions from natural grassland grazing as described in any one of claims 1-6, characterized in that, It includes a data acquisition module, a monitoring module, and a computing module; The data acquisition module is used to collect various parameters, including CO2, CH4 and N2O parameters, as well as other parameters required to calculate the total greenhouse gas emissions from natural grassland grazing. The monitoring module is used to monitor and obtain the annual N2O emissions from natural grasslands; The calculation module is used to calculate the greenhouse gas emissions of livestock and the total greenhouse gas emissions of natural grassland grazing based on all the parameters collected above.

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