Method for evaluating greenhouse gas emissions from grazing grasslands

Abstract

The application relates to an evaluation method for greenhouse gas emission of a grazing grassland, comprising the following steps: S1: collecting air above the grassland by a static chamber method and measuring the concentration of various greenhouse gases in the collected air and the change rate thereof; S2: calculating the annual greenhouse gas emission of the whole grassland ecosystem; S3: estimating direct or indirect energy consumption in the grassland production process, including direct emission generated by using fossil energy such as diesel, gasoline and coal and indirect emission caused by power consumption such as pumping irrigation, drainage and machine ploughing; S4: calculating the whole-year equivalent of the whole grassland production process; S5: obtaining the whole-year economic output of the whole grassland; S6: calculating the greenhouse gas emission intensity of the grassland according to the whole-year equivalent of the whole grassland and the whole-year economic output of the whole grassland. Since the above technical scheme is adopted, the evaluation method for greenhouse gas emission of the grazing grassland can improve the accuracy of the calculation result, and further improve the accuracy of the obtained greenhouse gas emission intensity.

Description

Technical Field

[0001] This invention relates to the field of greenhouse gas measurement technology, and specifically to an assessment method for greenhouse gas emissions from grazing grasslands. Background Technology

[0002] Greenhouse gases mainly include carbon dioxide (CO2) ), nitrous oxide ( ) and methane ( Due to greenhouse gas emissions, the global climate is gradually warming, which has attracted great attention from all walks of life.

[0003] In some farms with cultivated grasslands, static boxes are used to collect greenhouse gas emissions per unit area of ​​grassland per unit time. The weight of greenhouse gases emitted per unit area of ​​grassland per unit time is then obtained, and finally, the greenhouse gas emission intensity of the entire grassland is calculated. The calculation of the weight of greenhouse gases emitted per unit area of ​​cultivated grassland per unit time is based on the greenhouse gas concentration in the air above the grassland before the static box is installed, the concentration of greenhouse gases in the gas collected from the static box, and the volume of the static box's interior. However, when using existing static boxes to collect greenhouse gases, the cultivated grass occupies a certain amount of space within the static box. This causes the volume of the static box's interior used to calculate the weight of greenhouse gases emitted per unit area of ​​cultivated grassland per unit time to be larger than the actual volume of gas contained within the static box. This results in poor accuracy of the calculation results, and consequently, poor accuracy of the obtained greenhouse gas emission intensity. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method for assessing greenhouse gas emissions from grazing grasslands, so as to solve the technical problem that the calculated weight of greenhouse gas emissions from grasslands in the prior art is inaccurate.

[0005] This invention is achieved through the following technical solution:

[0006] An assessment method for greenhouse gas emissions from grazing grasslands includes the following steps:

[0007] S1: Collect air above the grassland and measure the concentration of greenhouse gases in the collected air;

[0008] S2: Install a transparent static box on a unit area of ​​grass and collect the gas inside the static box after a unit time and measure the concentration of greenhouse gases in the gas. Before collecting the gas inside the static box, push the pressure plate located inside the static box downward by a push rod to squeeze the cultivated grass inside the static box downward. The upper end of the push rod is located above the static box and the lower end is connected to the upper side of the pressure plate. The pressure plate is horizontally set and adapted to the inner cavity of the static box. The pressure plate has flow holes that connect its upper and lower sides.

[0009] S3: Based on the measured concentration of greenhouse gases in the air above the grassland, the measured concentration of greenhouse gases in the gas collected in the static box, the volume of the flow hole, the volume of the portion of the static box's inner cavity located above the pressure plate, and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity, calculate the weight of greenhouse gases emitted per unit area of ​​the grassland per unit time. Combine this with the total area of ​​the entire grassland to obtain the annual greenhouse gas emission weight of the entire grassland.

[0010] S4: Based on parameters provided by the Intergovernmental Panel on Climate Change (IPCC), the timescale over a 100-year period was obtained. global warming potential and The global warming potential was calculated, and the entire annual warming potential of the grassland was calculated. equivalent.

[0011] S5: Obtain the economic output of the entire grassland for the whole year;

[0012] S6: Based on the entire grassland year-round The greenhouse gas emission intensity of the grassland is calculated based on the equivalent and the total annual economic output of the grassland.

[0013] Furthermore, the static box includes a transparent box body with a closed upper end and an open lower end, a pressure plate horizontally disposed inside the box body and adapted to the box body, a drive unit for driving the pressure plate to move downward and pressing the cultivated grass inside the box body to the ground, and a three-way valve connected to the inner cavity of the box body through a pipe. The pressure plate has flow holes that penetrate its upper and lower sides, and the drive unit is also used to drive the pressure plate to move upward and detach it from the cultivated grass inside the box body.

[0014] Furthermore, the flow hole is inclined, and the upper and lower ports of the flow hole do not intersect when projected onto the same horizontal plane.

[0015] Furthermore, there are multiple flow holes, and the centerlines of the multiple flow holes are oriented differently.

[0016] Furthermore, the upper side wall of the housing is provided with a circular hole, and a sealing ring is provided on the wall of the circular hole; the driving unit includes a support seat provided on the upper side of the housing, a cylinder fixed on the support seat, and a pulling part for pulling the support seat downward, the piston rod of the cylinder is adapted to the circular hole, and the piston rod of the cylinder passes downward through the circular hole and connects to the pressure plate; the sealing ring is used to seal the gap between the piston rod and the wall of the circular hole.

[0017] Furthermore, the support base includes a connecting plate and a connecting part for connecting the connecting plate to the top of the box body. The edge of the connecting plate is recessed inward to form a plurality of grooves evenly arranged along the edge of the connecting plate. The holding part includes a plurality of tensile piles corresponding to each of the grooves, with the lower end for being driven into the soil layer and the upper part having external threads, and a plurality of nuts respectively screwed into the upper part of each tensile pile. The upper end of the tensile pile is adapted to the groove and is used to be placed in the groove. The nuts are used to abut the upper side of the connecting plate downward.

[0018] Furthermore, each of the tensile piles has an inclined hole at its lower part for connecting its two opposite sides, and the holding part also includes multiple inclined pins that are adapted to each of the inclined holes.

[0019] Furthermore, the tensioning part also includes multiple tensile blocks and multiple rotating auxiliary rods. The tensile block is formed by protruding outward on the lower surface of each tensile pile. The cross-section of the tensile block is an isosceles triangle with the base facing up and the apex facing down. The rotating auxiliary rod is formed by protruding outward on the two opposite sides at the upper end of each tensile pile.

[0020] Furthermore, the connecting part includes a plurality of cylinders fixed to the upper side of the housing, a plurality of connecting rods fixed to the lower side of the connecting plate corresponding to the positions of each of the cylinders and adapted to the cylinder cavities, and bolts provided on the cylinders. The cylinder wall is provided with screw holes adapted to the bolts. The surface of the connecting rod is recessed inward at the position corresponding to the screw hole to form a receiving groove adapted to the bolt. The bolt is screwed into the screw hole, and the screw-in end of the bolt is used to insert into the receiving groove.

[0021] Furthermore, the box body includes a box body body and an insertion ring disposed at the lower end of the box body body for insertion into the soil layer. The edge of the insertion ring is fixedly connected to the edge of the box body. The ring wall of the insertion ring gradually thins from the upper end to the lower end to form a cutting edge at the lower end of the insertion ring.

[0022] The beneficial effects of this invention are as follows:

[0023] Before using the static box, the length and width of the static box's inner cavity, the diameter of the push rod, and the volume of the flow hole are measured. Since the transparent static box is installed on a unit area of ​​grassland and after a unit time has elapsed, before collecting gas from the static box, the cultivated grass inside the static box is squeezed downwards by a pressure plate located within the static box. This forces the gas located below the pressure plate into the flow hole and the portion of the static box's inner cavity located above the pressure plate. This ensures that the calculated weight of greenhouse gases emitted per unit area of ​​grassland within a unit time is very close to the actual weight of greenhouse gases emitted per unit area of ​​grassland within a unit time. Therefore, the method for assessing greenhouse gas emissions from grazing grasslands described in this invention improves the accuracy of the calculation results, and consequently, the accuracy of the obtained greenhouse gas emission intensity.

[0024] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0025] Figure 1 This is a top view of the static box in the method for assessing greenhouse gas emissions from grazing grasslands, as described in this invention.

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 This is a schematic cross-sectional view of the tensile block used in the method for assessing greenhouse gas emissions from grazing grasslands according to the present invention.

[0028] The meanings of the numbers in the attached diagram are as follows:

[0029] Box body-1; Pressure plate-2; Pipe body-3; Three-way valve-4; Flow hole-5; Round hole-6; Sealing ring-7; Cylinder-8; Connecting plate-9; Groove-10; Tensile pile-11; Nut-12; Angled hole-13; Angled pin-14; Tensile block-15; Auxiliary rod-16; Cylinder-17; Connecting rod-18; Bolt-19; Screw hole-20; Receiving groove-21; Box body-22; Insertion ring-23. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0035] Please see Figure 1-3 This invention provides a technical solution: a method for assessing greenhouse gas emissions from grazing grasslands, comprising the following steps:

[0036] S1: Collect air above the grassland and measure the concentration of greenhouse gases in the collected air.

[0037] The air above the grassland can be collected using a syringe and a sampling bag. After collecting the air above the grassland, the sampling bag is taken to a laboratory, where the concentration of greenhouse gases in the collected air can be obtained by gas chromatography. The concentration of greenhouse gases includes carbon dioxide, nitrous oxide, and methane. In the following description, the concentration of greenhouse gases includes carbon dioxide, nitrous oxide, and methane.

[0038] S2: Install a transparent static box on a unit area of ​​grass and collect the gas inside the static box after a unit time and measure the concentration of greenhouse gases in the gas. Before collecting the gas inside the static box, push the pressure plate located inside the static box downward by a push rod to squeeze the cultivated grass inside the static box downward. The upper end of the push rod is located above the static box and the lower end is connected to the upper side of the pressure plate. The pressure plate is horizontally set and adapted to the inner cavity of the static box. The pressure plate has flow holes that connect its upper and lower sides.

[0039] Before using the static box, measure the length and width of its inner cavity, the diameter of the push rod, and the volume of the flow hole. When the pressure plate inside the static box presses down on the cultivated grass, the gas located below the pressure plate is forced into the flow hole and the portion of the static box's inner cavity above the pressure plate. After the pressure plate presses down on the cultivated grass, use a ruler to measure the height of the portion of the static box's inner cavity above the pressure plate. This also allows you to determine the position of the push rod above the pressure plate. The volume of the portion of the static chamber located below the top wall of the inner cavity is calculated using the length of the inner cavity, the width of the inner cavity, and the height of the portion of the inner cavity located above the pressure plate. The volume of the portion of the push rod located above the pressure plate and below the top wall of the inner cavity can also be calculated using the diameter of the push rod and the length of the portion of the push rod located above the pressure plate and below the top wall of the inner cavity. The greenhouse gas concentrations collected from the static chamber are also obtained using gas chromatography.

[0040] S3: Based on the measured greenhouse gas concentration in the air above the grassland, the measured greenhouse gas concentration in the gas collected in the static box, the volume of the flow hole, the volume of the portion of the static box's inner cavity located above the pressure plate, and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity, calculate the weight of greenhouse gas emitted per unit area of ​​the grassland per unit time. Then, combine this with the total area of ​​the entire grassland to obtain the annual greenhouse gas emission weight of the entire grassland.

[0041] The weight of greenhouse gases per unit volume in the air can be calculated based on the concentration of greenhouse gases in the air. Similarly, the weight of greenhouse gases per unit volume in the static chamber can be calculated based on the concentration of greenhouse gases collected in the static chamber. The difference between the volume of the portion of the static chamber's inner cavity located above the pressure plate and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static chamber's inner cavity is calculated. Multiplying this difference by the volume of the flow hole by the difference between the weight of greenhouse gases per unit volume in the static chamber and the weight of greenhouse gases per unit volume in the air yields the weight of greenhouse gases emitted per unit area of ​​grassland per unit time. Then, the total area of ​​the entire grassland is measured, and combined with this total area, the annual greenhouse gas emissions of the entire grassland can be obtained. The weight of greenhouse gases emitted per unit area of ​​grassland per unit time includes the weight of carbon dioxide, nitrous oxide, and methane emitted per unit area of ​​grassland per unit time.

[0042] S4: Based on parameters provided by the Intergovernmental Panel on Climate Change (IPCC), the timescale over a 100-year period was obtained. global warming potential and The global warming potential value, The Global Warming Potential (GWP) is the percentage of carbon dioxide emitted into the atmosphere per kilogram of flint or 1 kg ... Radiative forcing with 1kg The ratio of radiative forcing, The global warming potential is 25. The Global Warming Potential (GWP) is the percentage of carbon dioxide emitted into the atmosphere per kilogram of flint or 1 kg ... Radiative forcing with 1kg The ratio of radiative forcing, The global warming potential is 298. The annual warming potential of the entire grassland is calculated. Equivalent, calculated using the following formula:

[0043] = +298× +25×

[0044] in: Indicates the year of the entire grassland equivalent;

[0045] Indicates the year of the entire grassland Flux;

[0046] Indicates the year of the entire grassland Flux;

[0047] Indicates the year of the entire grassland Flux;

[0048] The flux value is positive when any gas is emitted into the grassland, and negative when it is absorbed.

[0049] S5: Obtain the economic output of the entire grassland for the whole year; that is, the product of the annual cultivated grass output and the unit price of cultivated grass.

[0050] S6: Based on the entire grassland year-round The greenhouse gas emission intensity of the grassland is calculated based on the equivalent and the total annual economic output of the grassland.

[0051] Specifically, utilizing the grassland ecosystem throughout the year Emission equivalent ( ) and economic output ( ) Calculate the economic output per unit Emission equivalent, which is the GHG emission intensity of a grazing grassland ecosystem. The calculation formula is as follows:

[0052]

[0053] Before using the static box, measure the length and width of the inner cavity of the static box, measure the diameter of the push rod, and measure the volume of the flow hole. Since the transparent static box is installed on a unit area of ​​grass and after a unit time, before collecting the gas in the static box, the cultivated grass in the static box is squeezed downward by the pressure plate located in the static box. This can squeeze the gas located on the lower side of the pressure plate into the flow hole and the part of the inner cavity of the static box located on the upper side of the pressure plate. After the pressure plate presses down on the cultivated grass inside the static box, the height of the portion of the static box's inner cavity located above the pressure plate is measured using a ruler. This also allows us to obtain the length of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity. Then, using the length, width, and height of the portion of the static box's inner cavity located above the pressure plate, the volume of the portion of the static box's inner cavity located above the pressure plate can be calculated. Furthermore, the volume of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity can be calculated using the diameter of the push rod and the length of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity. The weight of greenhouse gases per unit volume in the air can be calculated based on the concentration of greenhouse gases in the air. Similarly, the weight of greenhouse gases per unit volume in the static chamber can be calculated based on the concentration of greenhouse gases collected in the static chamber. The difference between the volume of the portion of the static chamber's inner cavity located above the pressure plate and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static chamber's inner cavity is calculated. Multiplying the sum of this difference and the volume of the flow hole by the difference between the weight of greenhouse gases per unit volume in the static chamber and the weight of greenhouse gases per unit volume in the air yields the weight of greenhouse gases emitted per unit area of ​​grassland per unit time. The sum of the difference and the volume of the flow hole (i.e., the volume used to calculate the weight of greenhouse gases emitted per unit area of ​​the grassland per unit time) is very close to the volume of the portion of the static chamber actually used to contain the gas. This makes the calculated weight of greenhouse gases emitted per unit area of ​​the grassland per unit time very close to the actual weight of greenhouse gases emitted per unit area of ​​the grassland per unit time. The method for assessing greenhouse gas emissions from grazing grasslands described in this invention can improve the accuracy of the calculation results, and thus improve the accuracy of the obtained greenhouse gas emission intensity.

[0054] In this embodiment: the static box includes a transparent box body 1 with a closed upper end and an open lower end, a pressure plate 2 horizontally arranged inside the box body 1 and adapted to the box body 1, a driving part for driving the pressure plate 2 to move downward and pressing the cultivated grass inside the box body 1 to the ground, and a three-way valve 4 connected to the inner cavity of the box body 1 through a pipe body 3. The pressure plate 2 has flow holes 5 formed on its upper and lower sides. The driving part is also used to drive the pressure plate 2 to move upward and detach from the cultivated grass inside the box body 1.

[0055] In this invention, a transparent static box refers to a static box whose body 1 is transparent. When installing the static box, the body 1 is placed on a unit area of ​​grass, allowing it to contain the gas emitted by that unit area of ​​grass. After the body 1 is installed, the driving unit drives the pressure plate 2 downwards, pressing the cultivated grass inside the body 1 firmly to the ground. This forces the gas located below the pressure plate 2 inside the body 1 into the flow hole 5 and the portion of the inner cavity of the body 1 located above the pressure plate 2. The first port of the three-way valve 4 is connected to the inner cavity of the body 1 via a pipe 3. Before collecting the gas from the body 1, the second and third ports of the three-way valve 4 are connected. When collecting gas from the chamber 1, a 20ml syringe is connected to the second port of the three-way valve 4. The three-way valve 4 is adjusted so that its first port is connected to the second port, thus connecting the syringe to the inner cavity of the chamber 1. At this point, gas can be drawn from the chamber 1 using the syringe. Then, a 20ml gas bag is connected to the third port of the three-way valve 4. The three-way valve 4 is adjusted again so that its second port is connected to the third port, and the gas collected in the syringe is injected into the gas bag. The gas bag is then sealed, and it can be taken to the laboratory to test the concentration of greenhouse gases in the gas inside.

[0056] In this embodiment: the flow hole 5 is inclined, and the upper and lower ports of the flow hole 5 do not intersect when projected onto the same horizontal plane.

[0057] When the flow hole 5 is vertically positioned, the upper ends of some of the cultivated grass inside the box 1 can easily pass through the flow hole 5 to the upper side of the pressure plate 2. Since the upper and lower ports of the flow hole 5 do not intersect on the same horizontal plane (i.e., the upper and lower ports are completely offset), during the downward pressing of the cultivated grass by the pressure plate 2, the cultivated grass inside the box 1 is easily bent after being inserted into the flow hole 5. This reduces the amount of cultivated grass passing through the flow hole 5 to the upper side of the pressure plate 2, thus reducing the volume occupied by the cultivated grass in the space within the box 1 used to contain gas. In other words, it reduces the volume occupied by the cultivated grass in calculating the weight of greenhouse gases emitted per unit area of ​​the grassland per unit time, further improving the accuracy of the calculated weight of greenhouse gases emitted per unit area of ​​the grassland per unit time, and consequently, further improving the accuracy of the obtained greenhouse gas emission intensity.

[0058] In this embodiment, there are multiple flow holes 5, and the axial directions of the multiple flow holes 5 are different.

[0059] Because the densities of the various gas components within the chamber 1 differ, their vertical distribution is uneven. This results in the greenhouse gas concentration in the gas sampled from a specific location within the chamber 1 not accurately reflecting the overall greenhouse gas concentration. During the downward pressing of the pressure plate 2, the gas beneath it is forced upward through the flow holes 5. Since the axis of each flow hole 5 is oriented differently, the upward-flowing gas disturbs the gas within the chamber 1 in different directions. This allows for better mixing of the various gas components within the chamber 1, improving the uniformity of the mixture. Consequently, the greenhouse gas concentration in the gas sampled from a specific location within the chamber 1 more accurately reflects the overall greenhouse gas concentration within the chamber 1.

[0060] In this embodiment: the upper side wall of the housing 1 is provided with a circular hole 6, the circular hole 6 connects the upper and lower sides of the upper side wall of the housing 1, and a sealing ring 7 is provided on the hole wall of the circular hole 6; the driving part includes a support seat provided on the upper side of the housing 1, a cylinder 8 fixed on the support seat, and a pulling part for pulling the support seat downward; the push rod is the piston rod of the cylinder 8, the piston rod of the cylinder 8 is adapted to the circular hole 6, and the piston rod of the cylinder 8 passes downward through the circular hole 6 and connects to the pressure plate 2; the sealing ring 7 is used to seal the gap between the piston rod and the hole wall of the circular hole 6.

[0061] The sealing ring 7 is used to seal the gap between the piston rod and the wall of the circular hole 6, making it difficult for the gas inside the box 1 to escape from the gap between the circular hole 6 and the piston rod, thus making the detected concentration of greenhouse gases in the gas inside the box 1 closer to the actual situation. The support base is used to support the cylinder 8 above the box 1. The extension and retraction of the piston rod of the cylinder 8 can drive the pressure plate 2 to move downward or upward. When the piston rod of the cylinder 8 extends, it can push the pressure plate 2 downward to press the cultivated grass inside the box 1 to the ground. When the piston rod of the cylinder 8 retracts, it can pull the pressure plate 2 upward to detach the pressure plate 2 from the cultivated grass inside the box 1. When the pressure plate 2 presses the cultivated grass inside the box 1, the pressure plate 2 and the piston rod will be subjected to an upward reaction force, which is transmitted upward to the cylinder body of the cylinder 8 and the support base. Since the holding part is used to pull the support seat downward, the reaction force is applied to the holding part by the support seat, making it difficult for the cylinder body of the cylinder 8 and the support seat to move upward when the pressure plate 2 presses the cultivated grass in the box 1.

[0062] In this embodiment: the support base includes a connecting plate 9 and a connecting part for connecting the connecting plate 9 to the upper part of the housing 1. The edge of the connecting plate 9 is recessed inward to form four grooves 10 evenly arranged along the edge of the connecting plate 9. The cylinder body of the cylinder 8 is fixed on the connecting plate 9. It can be understood that the grooves 10 are not limited to four. In some embodiments, the grooves 10 can also be three or more. The holding part includes four tensile piles 11 that correspond one-to-one with each of the grooves 10, with their lower ends for driving into the soil and their upper parts having external threads, and four nuts 12 that are screwed one-to-one with the upper part of each tensile pile 11. The upper end of the tensile pile 11 is adapted to the groove 10 and is used to be placed in the groove 10. The nuts 12 are used to abut against the upper side of the connecting plate 9. It is understood that the tensile piles 11 are not limited to four. In some embodiments, the tensile piles 11 can also be three or more, as long as the number of tensile piles 11 is the same as the number of grooves 10 and corresponds one-to-one with each groove 10. Similarly, the nuts 12 are not limited to four. In some embodiments, the nuts 12 can also be three or more, as long as the number of nuts 12 is the same as the number of tensile piles 11 and corresponds one-to-one with each tensile pile 11.

[0063] After the box 1 is installed on the grass, the connecting plate 9 is supported above the box 1 via the connecting part, and the cylinder 8 is also supported above the box 1 via the connecting plate 9. Each of the tensile piles 11 is driven downwards into the soil around the box 1 from its respective groove 10 position. The lower end of each tensile pile 11 is driven into the soil, and the upper part is located in the corresponding groove 10. The nut 12 is rotated on the tensile pile 11, causing the nut 12 to move downwards and abut against the connecting plate 9. With this structure, the tensile pile 11 can pull the connecting plate 9 downwards, and the reaction force acts on the tensile pile 11 through the connecting plate 9, thus enabling the pulling part to pull the support base downwards.

[0064] In this embodiment, each of the tensile piles 11 has an inclined hole 13 at its lower part for connecting its two opposite sides. The holding part also includes multiple inclined pins 14 that are adapted to each of the inclined holes 13. There are four inclined pins 14. It can be understood that in other embodiments, there can be more than three inclined pins 14, as long as the number of inclined pins 14 is the same as the number of tensile piles 11 and corresponds one-to-one with the tensile piles 11.

[0065] If the reaction force acting on the tensile pile 11 is too large, it may pull the tensile pile 11 out of the soil. Therefore, the reaction force on the tensile pile 11 cannot be too large. The greater the pressure of the pressure plate 2 on the cultivated grass inside the box 1, the greater the reaction force. Therefore, the pressure of the pressure plate 2 on the cultivated grass inside the box 1 cannot be too large, that is, the pressure plate 2 cannot compress the cultivated grass inside the box 1 too tightly. In this embodiment, when the lower end of the tensile pile 11 is driven into the soil, the upper end of the inclined hole 13 is positioned above the soil layer. One end of the inclined pin 14 is driven into the soil layer at an angle after passing through the inclined hole 13. This makes the connection between the tensile pile 11 and the soil layer more stable, allowing the tensile pile 11 to withstand greater reaction forces without being pulled out of the soil layer. This allows the pressure plate 2 to compress the cultivated grass inside the box 1 more tightly, further pressurizing the gas between the gaps in the cultivated grass inside the box 1 into the flow hole 5 and the portion of the inner cavity of the box 1 located above the pressure plate 2. This improves the accuracy of the calculated weight of greenhouse gases emitted per unit area of ​​the grassland per unit time.

[0066] In this embodiment, the holding part further includes multiple tensile blocks 15 and multiple rotating auxiliary rods 16. The lower surface of each tensile pile 11 has an outwardly protruding tensile block 15. The cross-section of the tensile block 15 is an isosceles triangle with the base facing upward and the apex facing downward. Two opposite sides at the upper end of each tensile pile 11 have outwardly protruding rotating auxiliary rods 16. In this embodiment, each tensile pile 11 has three outwardly protruding tensile blocks 15 on its lower surface. It is understood that in other embodiments, the number of outwardly protruding tensile blocks 15 on the lower surface of each tensile pile 11 can be other than that.

[0067] When the lower part of the tensile pile 11 is driven into the soil, the tensile block 15 is driven into the soil along with the corresponding tensile pile 11. The two rotating auxiliary rods 16 are struck in opposite horizontal directions to make the tensile pile 11 rotate. The tensile block 15 rotates with the tensile pile 11 and is embedded in the soil in the horizontal direction, making the connection between the tensile pile 11 and the soil more stable. This allows the tensile pile 11 to withstand greater reaction force without being pulled out of the soil. It also allows the pressure plate 2 to compress the cultivated grass in the box 1 more tightly, and further compresses the gas between the gaps of the cultivated grass in the box 1 into the flow hole 5 and the part of the inner cavity of the box 1 located on the upper side of the pressure plate 2. This improves the accuracy of the calculated weight of greenhouse gases emitted per unit area of ​​the grassland per unit time. The cross-section of the tensile block 15 is an isosceles triangle with the base facing up and the apex facing down. The tensile block 15 has a downward-pointing apex, so that the tensile block 15 can be driven into the soil along with the lower end of the tensile pile 11.

[0068] In this embodiment: the connecting part includes a plurality of cylinders 17 fixed to the upper side of the housing 1, a plurality of connecting rods 18 fixed to the lower side of the connecting plate 9, each corresponding to a position of the cylinder 17 and adapted to the cylinder cavity of the cylinder 17, and bolts 19 provided on the cylinder 17. The cylinder wall of the cylinder 17 is provided with screw holes 20 adapted to the bolts 19. The surface of the connecting rod 18 is recessed inward at the position corresponding to the screw hole 20 to form a receiving groove 21 adapted to the bolt 19. The bolt 19 is screwed into the screw hole 20, and the screw-in end of the bolt 19 is used to insert into the receiving groove 21.

[0069] Rotating the corresponding bolt 19 within each of the screw holes 20 causes the screw-in end of each bolt 19 to be inserted into the corresponding receiving groove 21. At this point, the connecting part can stably support the connecting plate 9 and the cylinder 8 on the housing 1. Rotating the corresponding bolt 19 within each of the screw holes 20 causes the screw-in end of each bolt 19 to be dislodged from the corresponding receiving groove 21. At this point, the connecting plate 9 and the cylinder body of the cylinder 8 can move upwards on the housing 1. In unexpected situations, i.e., when the reaction force is too large, i.e., when the connecting plate 9, the cylinder body of the cylinder 8, and each of the holding parts are pushed upwards, the housing 1 will not be pulled upwards, reducing the risk of gas escaping from the bottom of the housing 1.

[0070] In this embodiment: the box body 1 includes a box body 22 and an insertion ring 23 located at the lower end of the box body 22 for insertion into the soil layer. The edge of the insertion ring 23 is fixedly connected to the edge of the box body 1. The ring wall of the insertion ring 23 gradually thins from the upper end to the lower end to form a cutting edge at the lower end of the insertion ring 23.

[0071] In this invention, a transparent static box refers to a static box whose main body 22 is transparent. When installing the box 1 on the grass, the box 1 is placed on the grass, and then the main body 22 is pressed down. Under the action of the cutting edge at the lower end of the insertion ring 23, the insertion ring 23 can be quickly inserted into the soil layer, thereby realizing the installation of the static box on the grass. The insertion ring 23 and the lower side wall of the main body 22 can be inserted into the soil layer to a relatively deep depth, making it difficult for gas inside the main body 22 to leak out from the lower end of the main body 22.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for assessing greenhouse gas emissions from grazing grasslands, characterized in that, Includes the following steps: S1: Collect air above the grassland and measure the concentration of greenhouse gases in the collected air; S2: Install a transparent static box on a unit area of ​​grass and collect the gas inside the static box after a unit time and measure the concentration of greenhouse gases in the gas. Before collecting the gas inside the static box, push the pressure plate located inside the static box downward by a push rod to squeeze the cultivated grass inside the static box downward. The upper end of the push rod is located above the static box, and the lower end is connected to the upper side of the pressure plate. The pressure plate is horizontally set and adapted to the inner cavity of the static box. The pressure plate has flow holes that connect its upper and lower sides. S3: Based on the measured concentration of greenhouse gases in the air above the grassland, the measured concentration of greenhouse gases in the gas collected in the static box, the volume of the flow hole, the volume of the portion of the static box's inner cavity located above the pressure plate, and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static box's inner cavity, calculate the weight of greenhouse gases emitted per unit area of ​​the grassland per unit time. Combine this with the total area of ​​the entire grassland to obtain the annual greenhouse gas emission weight of the entire grassland. The weight of greenhouse gases per unit volume in the air is calculated based on the concentration of greenhouse gases in the air. The weight of greenhouse gases per unit volume in the static chamber is calculated based on the concentration of greenhouse gases collected in the static chamber. The difference between the volume of the portion of the static chamber's inner cavity located above the pressure plate and the volume of the portion of the push rod located above the pressure plate and below the top wall of the static chamber's inner cavity is calculated. The sum of this difference and the volume of the flow hole, multiplied by the difference between the weight of greenhouse gases per unit volume in the static chamber and the weight of greenhouse gases per unit volume in the air, yields the weight of greenhouse gases emitted per unit area of ​​grassland per unit time. Then, the total area of ​​the entire grassland is measured, and combined with this total area, the annual greenhouse gas emissions of the entire grassland can be obtained. The weight of greenhouse gases emitted per unit area of ​​grassland per unit time includes the weight of carbon dioxide, nitrous oxide, and methane emitted per unit area of ​​grassland per unit time. S4: Based on parameters provided by the Intergovernmental Panel on Climate Change (IPCC), the timescale over a 100-year period was obtained. global warming potential and The global warming potential was calculated, and the entire annual warming potential of the grassland was calculated. equivalent; S5: Obtain the economic output of the entire grassland for the whole year; S6: Based on the entire grassland year-round The greenhouse gas emission intensity of the grassland is calculated based on the equivalent and the total annual economic output of the grassland.

2. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 1, characterized in that: The static box includes a transparent box body with a closed upper end and an open lower end, a pressure plate horizontally arranged inside the box body and adapted to the box body, a drive unit for driving the pressure plate to move downward and pressing the cultivated grass inside the box body to the ground, and a three-way valve connected to the inner cavity of the box body through a pipe. The pressure plate has flow holes that penetrate its upper and lower sides. The drive unit is also used to drive the pressure plate to move upward and detach the cultivated grass inside the box body.

3. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 2, characterized in that: The flow hole is inclined, and the upper and lower ports of the flow hole do not intersect when projected onto the same horizontal plane.

4. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 2, characterized in that: There are multiple flow holes, and the centerlines of the multiple flow holes are oriented differently.

5. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 2, characterized in that: The upper side wall of the housing is provided with a circular hole, and a sealing ring is provided on the wall of the circular hole; the driving unit includes a support seat provided on the upper side of the housing, a cylinder fixed on the support seat, and a pulling part for pulling the support seat downward. The piston rod of the cylinder is adapted to the circular hole, and the piston rod of the cylinder passes downward through the circular hole and connects to the pressure plate; the sealing ring is used to seal the gap between the piston rod and the wall of the circular hole.

6. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 5, characterized in that: The support base includes a connecting plate and a connecting part for connecting the connecting plate to the top of the box body. The edge of the connecting plate is recessed inward to form a plurality of grooves evenly arranged along the edge of the connecting plate. The holding part includes a plurality of tensile piles corresponding to each of the grooves, with the lower end for being driven into the soil and the upper part having external threads, and a plurality of nuts respectively screwed into the upper part of each tensile pile. The upper end of the tensile pile is adapted to the groove and is used to be placed in the groove. The nuts are used to abut the upper side of the connecting plate downward.

7. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 6, characterized in that: Each of the tensile piles has an inclined hole at its lower part for connecting its two opposite sides and is inclinedly arranged. The holding part also includes multiple inclined pins that are adapted to each of the inclined holes.

8. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 6, characterized in that: The tensioning part also includes multiple tensile blocks and multiple rotating auxiliary rods. The tensile block is formed by the outward protrusion of the lower surface of each tensile pile. The cross-section of the tensile block is an isosceles triangle with the base facing up and the apex facing down. The rotating auxiliary rod is formed by the outward protrusion of the two opposite sides at the upper end of each tensile pile.

9. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 6, characterized in that: The connecting part includes a plurality of cylinders fixed to the upper side of the housing, a plurality of connecting rods fixed to the lower side of the connecting plate corresponding to the positions of each of the cylinders and adapted to the cylinder cavities, and bolts provided on the cylinders. The cylinder wall is provided with screw holes adapted to the bolts. The surface of the connecting rod is recessed inward at the position corresponding to the screw hole to form a receiving groove adapted to the bolt. The bolt is screwed into the screw hole, and the screw-in end of the bolt is used to insert into the receiving groove.

10. The method for assessing greenhouse gas emissions from grazing grasslands according to claim 2, characterized in that: The box includes a box body and an insertion ring located at the lower end of the box body for insertion into the soil layer. The edge of the insertion ring is fixedly connected to the edge of the box body. The ring wall of the insertion ring gradually thins from the upper end to the lower end to form a cutting edge at the lower end of the insertion ring.

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