A device for measuring greenhouse gas emissions from simulated field soil profiles

Abstract

The present invention discloses a measuring device for simulating greenhouse gas emissions from a field soil profile, comprising an outer cylindrical tube and an inner cylindrical tube for loading field soil samples, the bottom of the outer cylindrical tube being fixedly connected to a base plate, and the top of the base plate being fixedly mounted with an inner cylindrical tube, the diameter of the inner cylindrical tube being smaller than the diameter of the outer cylindrical tube, and the inner cylindrical tube being located inside the outer cylindrical tube, and the inner wall of the outer cylindrical tube being fixedly mounted with four air chamber partitions from top to bottom, respectively, and the air chamber partitions evenly divide the inner cavity of the outer cylindrical tube into four closed air chambers. The measuring device for simulating greenhouse gas emissions from a field soil profile has a simple overall structure, low cost, and is easy to obtain materials, manufacture, and operate. It can better simulate the response of greenhouse gas emissions from field soil profiles to global warming, and provide accurate data for better predicting the impact of global changes on greenhouse gas emissions from future soil ecosystems.

Description

Technical Field

[0001] The present invention relates to the technical field of field soil greenhouse gas emission measurement, in particular to a measurement device for simulating field soil profile greenhouse gas emissions. Background Art

[0002] Soils within forest ecosystems are a vast carbon reservoir, releasing 8-10 times the amount of carbon emitted by fossil fuels into the atmosphere annually. Within the entire soil profile, deep soil carbon stores 1.24 times more than surface soil. Therefore, enhancing the carbon sequestration capacity of deep soils and reducing carbon emissions are important pathways for mitigating the increase in atmospheric CO2 concentrations. However, how the factors regulating greenhouse gas emissions from deep soils respond to climate warming remains unknown. Traditionally, studies of deep soils have employed similar methods to those used for surface soils, altering the microenvironment and compromising the accuracy and reliability of the resulting findings. Therefore, we designed an indoor experimental device that simulates greenhouse gas emissions from field soil profiles to investigate the changing patterns of the factors regulating deep soil greenhouse gas emissions under climate warming. In recent years, numerous field experiments and laboratory experiments have been conducted worldwide to simulate the impacts of climate change on forest ecosystems. Through these simulations, researchers have attempted to predict the impacts of climate change on soil greenhouse gas emissions in advance, thereby helping humanity prepare for future climate change. Traditional laboratory research methods involve loading retrieved soil into incubation devices layer by layer. This often overlooks the exchange of water and gases between different layers within the in-situ soil. This also alters the microenvironment (e.g., aeration) in the deeper soil layers, resulting in results that fail to reflect field conditions. Therefore, a device designed to simulate field soil profile greenhouse gas emissions is needed to address these challenges. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for measuring greenhouse gas emissions from simulated field soil profiles, to facilitate research on the impact of simulated climate warming on soil greenhouse gas emissions, and to provide a theoretical basis for predicting the impact of global climate warming on soil ecosystems, so as to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a measuring device for simulating greenhouse gas emissions from field soil profiles, comprising an outer cylindrical tube and an inner cylindrical tube for loading field soil samples, the bottom of the outer cylindrical tube being fixedly connected to a base plate, and the top of the base plate being fixedly installed with an inner cylindrical tube, the diameter of the inner cylindrical tube being smaller than the diameter of the outer cylindrical tube, and the inner cylindrical tube being located inside the outer cylindrical tube, four air chamber partitions being fixedly installed on the inner wall of the outer cylindrical tube from top to bottom, and the air chamber partitions being sealed to the outer wall of the inner cylindrical tube, the air chamber partitions evenly dividing the inner cavity of the outer cylindrical tube into four closed air chambers, and the surface of the inner cylindrical tube being provided with air holes communicating with the closed air chambers.

[0005] Preferably, a through hole a is provided on the outer cylindrical tube, and a gas tube is sealed in the through hole a, one end of the gas tube extends into the closed air chamber, and the other end of the gas tube extends outside the outer cylindrical tube. There are two gas tubes in each closed air chamber, one of which serves as an air inlet and the other serves as an air outlet.

[0006] Preferably, the outer cylindrical tube is further provided with a through hole b, and a liquid tube is sealedly inserted into the through hole b, the other end of the liquid tube is inserted into the inner cylindrical tube, and the other end of the liquid tube extends outside the outer cylindrical tube.

[0007] Preferably, the outer tube openings of the gas tube and the liquid tube are both sealedly connected with sealing rubber plugs, and the outer ends of the gas tube and the liquid tube are both interference-fittedly connected with sealing tube caps, and the sealing tube caps wrap the sealing rubber plugs.

[0008] Preferably, the gas tube is adapted to be equipped with a gas extraction syringe, the liquid tube is adapted to be equipped with an additive syringe, a guiding tube is fixed in the inner cylindrical tube, and the liquid tube is connected to the guiding tube.

[0009] Preferably, a cylinder cover is detachably mounted on the top of the outer cylindrical cylinder, and the diameter of the cylinder cover is larger than the inner diameter of the outer cylindrical cylinder.

[0010] Preferably, an upper magnetic block is fixedly connected to the side of the cylinder cover, and a lower magnetic block is fixedly connected to the top of the side of the outer cylindrical cylinder, and the upper magnetic block and the lower magnetic block are magnetically attracted to each other.

[0011] Preferably, the height of each of the sealed air chambers is H, and H is 20 cm.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) This device for measuring greenhouse gas emissions from simulated field soil profiles effectively solves the problem that traditional indoor incubation tests cannot accurately simulate the exchange process of water, gas, etc. between different soil layers. It does not interfere with the deep soil microenvironment and overcomes the defects of field in-situ simulation warming equipment, which is expensive and easily affected by weather.

[0014] (2) The device for measuring greenhouse gas emissions from simulated field soil profiles has a simple overall structure, low cost, and is easy to obtain, manufacture, and operate. It can better simulate the response of greenhouse gas emissions from simulated field soil profiles to global warming, and provide accurate data for better predicting the impact of global change on future greenhouse gas emissions from soil ecosystems. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0016] Figure 2 It is a cross-sectional view of the outer cylindrical barrel of the structure of the present invention;

[0017] Figure 3 This is an exploded view of the connection between the outer cylindrical tube and the tube cover of the structure of the present invention;

[0018] Figure 4 A cross-sectional view of the inner cylindrical tube of the structure of the present invention;

[0019] Figure 5 This is an exploded view of the connection between the structural gas pipe and the sealing pipe cap of the present invention.

[0020] In the figure: 1. outer cylinder; 2. base plate; 3. inner cylinder; 4. air chamber partition; 5. sealed air chamber; 6. air hole; 7. penetration hole a; 8. gas pipe; 9. sealing pipe cap; 10. penetration hole b; 11. liquid pipe; 110. guide tube; 12. additive syringe; 13. air extraction syringe; 14. sealing rubber plug; 15. cylinder cover; 16. upper magnetic block; 17. lower magnetic block. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-5 , the present invention provides the following embodiments:

[0023] Example 1

[0024] A measuring device for simulating greenhouse gas emissions from a field soil profile comprises an outer cylindrical tube 1 and an inner cylindrical tube 3 for loading field soil samples, the bottom of the outer cylindrical tube 1 is fixedly connected to a base plate 2, and the top of the base plate 2 is fixedly mounted with the inner cylindrical tube 3, the diameter of the inner cylindrical tube 3 is smaller than the diameter of the outer cylindrical tube 1, and the inner cylindrical tube 3 is located inside the outer cylindrical tube 1, four air chamber partitions 4 are fixedly mounted on the inner wall of the outer cylindrical tube 1 from top to bottom, and the air chamber partitions 4 are sealed to the outer wall of the inner cylindrical tube 3, the air chamber partitions 4 evenly divide the inner cavity of the outer cylindrical tube 1 into four closed air chambers 5, the surface of the inner cylindrical tube 3 is provided with air holes 6 communicating with the closed air chambers 5, four closed air chambers 5 of different heights are set, and each closed air chamber 5 corresponds to a soil layer of the same height, so as to extract gas from different soil layers.

[0025] Furthermore, a through hole a7 is opened on the outer cylindrical tube 1, and a gas tube 8 is sealed and connected in the through hole a7. One end of the gas tube 8 extends into the closed air chamber 5, and the other end of the gas tube 8 extends outside the outer cylindrical tube 1. There are two gas tubes 8 in each closed air chamber 5, one of which serves as an air inlet and the other serves as an air outlet.

[0026] Furthermore, a through hole b10 is provided on the outer cylindrical tube 1 , and a liquid tube 11 is sealedly inserted into the through hole b10 . The other end of the liquid tube 11 is inserted into the inner cylindrical tube 3 , and the other end of the liquid tube 11 extends outside the outer cylindrical tube 1 .

[0027] Furthermore, a cylinder cover 15 is detachably mounted on the top of the outer cylindrical barrel 1 . The diameter of the cylinder cover 15 is larger than the inner diameter of the outer cylindrical barrel 1 . The cylinder cover 15 can be sealed or opened during the culture process, depending on the culture requirements.

[0028] Furthermore, the height of each sealed air chamber 5 is H, and H is 20 cm.

[0029] The specific implementation method of this embodiment is as follows: field soil samples are loaded into the inner cylindrical tube 3 according to the corresponding soil layers, and equal amounts of exogenous liquid are added to different soil layers through the liquid tube 11 for regular cultivation. Since the air holes 6 on the inner cylindrical tube 3 lead to the closed air chamber 5, the gas in the soil layer can enter the closed air chamber 5 for exchange. During this period, the gas can be regularly pumped out through the gas tube 8 for measurement, so as to more intuitively understand the differences in greenhouse gas release in each layer of soil and simulate the actual situation in the field.

[0030] Example 2

[0031] The difference from the first embodiment is that the following contents are also included:

[0032] The outer tube openings of the gas tube 8 and the liquid tube 11 are both sealed with sealing rubber plugs 14 , and the outer ends of the gas tube 8 and the liquid tube 11 are both interference fit connected with sealing tube caps 9 , which wrap the sealing rubber plugs 14 .

[0033] Furthermore, the gas tube 8 is adapted to be equipped with a gas extraction syringe 13 , the liquid tube 11 is adapted to be equipped with an additive syringe 12 , a delivery tube is fixed in the inner cylindrical tube 3 , and the liquid tube 11 is connected to the delivery tube.

[0034] Furthermore, an upper magnetic block 16 is fixedly connected to the side of the cylinder cover 15, and a lower magnetic block 17 is fixedly connected to the top of the side of the outer cylindrical cylinder 1, and the upper magnetic block 16 and the lower magnetic block 17 are magnetically attracted to each other to close or open the cylinder cover 15.

[0035] In this embodiment, when adding exogenous liquid for culture, the additive syringe 12 draws the exogenous liquid, the sealing tube cap 9 is opened, and then the needle of the additive syringe 12 is pierced through the sealing rubber stopper 14 in the liquid tube 11, so that the needle extends into the liquid tube 11. Then, by pushing the additive syringe 12, the exogenous liquid is delivered to the soil layer through the liquid tube 11 and the guide tube 110. When extracting gas for testing, the sealing tube cap 9 on the gas tube 8 is similarly opened, and then the needle of the gas extraction syringe 13 is pierced through the sealing rubber stopper 14 in the gas tube 8, so that the gas in the closed gas chamber 5 can be extracted into the gas extraction syringe 13 for subsequent measurement. The entire operation process has good sealing performance and is flexible to use.

[0036] Similarly, during the culture period, a 4:1 mixture of N2 and O2 can be sucked into the exhaust syringe 13, and then the needle of the exhaust syringe 13 can pierce the sealing rubber plug 14 in another gas tube 8, and the mixed gas inside can be injected into the closed gas chamber 5 for replacement. The gas tube 8 can serve as an air inlet and outlet, and the sealing rubber plug 14 ensures the sealing of the gas replacement.

[0037] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. 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 device for measuring greenhouse gas emissions from simulated field soil profiles, comprising an outer cylindrical tube (1) and an inner cylindrical tube (3) for loading field soil samples, characterized in that: The bottom of the outer cylindrical tube (1) is fixedly connected to a base plate (2), and the top of the base plate (2) is fixedly mounted with an inner cylindrical tube (3), the diameter of the inner cylindrical tube (3) is smaller than the diameter of the outer cylindrical tube (1), and the inner cylindrical tube (3) is located inside the outer cylindrical tube (1), and four air chamber baffles (4) are fixedly mounted on the inner wall of the outer cylindrical tube (1) from top to bottom, and the air chamber baffles (4) are sealed to the outer wall of the inner cylindrical tube (3), and the air chamber baffles (4) evenly divide the inner cavity of the outer cylindrical tube (1) into four closed air chambers (5), and the surface of the inner cylindrical tube (3) is provided with air holes (6) communicating with the closed air chambers (5); The outer cylindrical tube (1) is provided with a through hole a (7), and a gas pipe (8) is sealed and connected inside the through hole a (7), one end of the gas pipe (8) extends into the sealed gas chamber (5), and the other end of the gas pipe (8) extends outside the outer cylindrical tube (1), and there are two gas pipes (8) in each sealed gas chamber (5), one of the gas pipes (8) serves as an air inlet, and the other gas pipe (8) serves as an air outlet; The outer cylindrical tube (1) is also provided with a through hole b (10), and a liquid tube (11) is sealedly inserted into the through hole b (10), the other end of the liquid tube (11) is inserted into the inner cylindrical tube (3), and the other end of the liquid tube (11) extends outside the outer cylindrical tube (1); The outer pipe openings of the gas pipe (8) and the liquid pipe (11) are both sealedly connected with sealing rubber plugs (14), and the outer ends of the gas pipe (8) and the liquid pipe (11) are both connected with sealing pipe caps (9) by interference fit, and the sealing pipe caps (9) wrap the sealing rubber plugs (14); The gas tube (8) is equipped with a gas extraction syringe (13), the liquid tube (11) is equipped with an additive syringe (12), a delivery tube (110) is fixed inside the inner cylindrical tube (3), and the liquid tube (11) is connected to the delivery tube (110).

2. The device for measuring greenhouse gas emissions from simulated field soil profiles according to claim 1, characterized in that: A cylinder cover (15) is detachably mounted on the top of the outer cylindrical cylinder (1), and the diameter of the cylinder cover (15) is larger than the inner diameter of the outer cylindrical cylinder (1).

3. The device for measuring greenhouse gas emissions from simulated field soil profiles according to claim 2, characterized in that: An upper magnetic block (16) is fixedly connected to the side of the cylinder cover (15), and a lower magnetic block (17) is fixedly connected to the top of the side of the outer cylindrical cylinder (1), and the upper magnetic block (16) and the lower magnetic block (17) are magnetically attracted to each other.

4. The device for measuring greenhouse gas emissions from simulated field soil profiles according to claim 1, characterized in that: The height of each of the sealed air chambers (5) is H, and H is 20 cm.

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