Carbon flux synchronous measurement experimental device

Abstract

The present application relates to a kind of carbon flux synchronous measurement experimental equipment, including the monitoring device for studying soil carbon flux and the transparent cylinder for cultivating plant, the middle part of the transparent cylinder is provided with baffle, for separating the ground part and the soil part of plant in two independent chambers, for accommodating the chamber side wall of plant soil part is also provided with liquid supply interface for providing nutrient solution to plant, the baffle is opened with the perforation for facilitating plant to pass through, the two ends of the transparent cylinder are connected on the monitoring hole of monitoring device respectively.The experimental equipment of the present application can be used to monitor the related parameters of soil respiration under ground, and also can be used to monitor the carbon flux variation parameters above ground, and at the same time, two groups of monitoring data above ground and underground are obtained, which is beneficial to further study the relationship of soil respiration, and has important significance for promoting the carbon flux research of terrestrial ecosystem.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil carbon flux measurement, and particularly relates to a carbon flux synchronous measurement experimental device. BACKGROUND

[0002] Soil respiration is the main way of carbon returning to the atmosphere from the terrestrial ecosystem, and is also the characterization of life activities in the soil. Accurate determination of the release amount is the key to evaluating the biological processes in the ecosystem. Through monitoring of soil respiration and its related parameters, the response of root systems and soil microorganisms to climate change can be estimated. Soil CO2 flux is affected by various complex physical and biological processes in time and space. Long-term, continuous and accurate measurement of soil carbon flux is of great significance to the study of carbon flux of the terrestrial ecosystem.

[0003] At present, related researchers in the field have made some achievements in monitoring of soil respiration and its related parameters, including various in-situ measurement devices for soil carbon flux that have been developed. For example, the monitoring device for studying the relationship between light and soil carbon flux disclosed in CN 109212166A, and the soil carbon flux online monitoring device disclosed in CN 109212167A.

[0004] However, these devices can only be used to study the related parameters of soil respiration in the natural environment, i.e., to study the carbon flux below the ground, and cannot be used to further study the influence of carbon flux changes on the ground on soil respiration. In order to solve this problem, a synchronous measurement experimental device for aboveground and underground carbon flux needs to be developed. SUMMARY

[0005] Based on the deficiencies of the prior art, the purpose of the present application is to provide a carbon flux synchronous measurement experimental device, which can be used to further study the relationship between light and soil carbon flux.

[0006] The technical scheme of the present application is as follows: a carbon flux synchronous measurement experimental device, comprising a monitoring device for studying soil carbon flux and a transparent cylindrical body for cultivating plants, and a light-blocking cloth can be sleeved outside the transparent cylindrical body to perform experimental research under lightless conditions. A partition is arranged in the middle of the transparent cylindrical body to separate the ground part of the plant and the soil part in two independent chambers. A liquid supply interface for supplying nutrient solution to the plant is arranged on the side wall of the chamber for accommodating the soil part of the plant. A perforation is formed in the partition to facilitate the plant to pass through. The two ends of the transparent cylindrical body are connected to the monitoring holes of the monitoring device, respectively.

[0007] Since condensate water beads are easy to form at the monitoring sensor interface on the monitoring cover, these condensate water beads usually hang on the monitoring sensor interface, and when the monitoring sensor works, these hanging condensate water beads are sucked into the monitoring sensor upward, causing the monitoring sensor to work abnormally. In order to improve and solve the above-mentioned hanging water bead problem, the existing monitoring sensor interface needs to be optimized and improved.

[0008] Further, the monitoring cover of the monitoring device is provided with an interface for installing a monitoring sensor, the interface is provided with a hanging water bead anti-suck-back structure, the hanging water bead anti-suck-back structure comprises a hose and a tee joint, the tee joint comprises a middle joint and left and right joints located on both sides of the middle joint, the upper end of the hose is connected to the monitoring sensor interface, and the middle joint of the tee joint is connected to the lower end of the hose. By using the twist of the hose itself and the unevenness of the equipment installation position, the left and right joints of the tee joint at the lower end of the hose cannot be in a horizontal position, and the left and right joints must present a state of one high and one low, so that the functional roles of the left and right joints are automatically separated from each other, thereby achieving the anti-suck-back effect of the detection head hanging water beads.

[0009] Preferably, the middle part of the hose is further provided with a water-gas separation chamber, and the water-gas separation chamber is provided with a water-gas separation layer.

[0010] The above-mentioned hanging water bead anti-suck-back structure uses the twist of the hose itself and the unevenness of the equipment installation position, so that the left and right joints of the tee joint at the lower end of the hose cannot be in a horizontal position, and the left and right joints must present a state of one high and one low, so that the functional roles of the left and right joints are automatically separated from each other, that is, one end of the head drips water, and the other end of the head inhales air without interference, thereby achieving the anti-suck-back effect of the detection head hanging water beads, which can not only ensure the normal inhalation of gas for monitoring needs, but also prevent the hanging condensate water beads from being sucked back upward

[0011] In the process of using the automatic monitoring in the field, the monitoring cover is usually intermittently opened and closed according to the monitoring requirements. When the monitoring cover is opened, small branches, leaves and other plant debris around are easy to fall onto the sealing ring. In this case, when the monitoring cover is closed again, these plant debris are clamped between the lower edge of the monitoring cover and the trumpet-shaped outer flange of the sealing ring, so that the two cannot realize close cooperation, thereby directly causing the failure of the above-mentioned sealing structure, thereby directly affecting the accuracy of the monitoring data. In order to improve and solve the above-mentioned problem, the existing sealing structure needs to be optimized and improved.

[0012] Further, the monitoring hole edge of the monitoring device is provided with a sealing ring, which comprises a cylindrical upper flange and a trumpet-shaped outer flange connected to the lower end of the cylindrical upper flange, and the lower edge of the monitoring cover of the monitoring device is further provided with a sealing cover ring, the inner side of the sealing cover ring extends to the inner cavity of the monitoring cover to form an inner flange wing plate, which can cover the cylindrical upper flange of the sealing ring when the monitoring cover is buckled on the sealing ring of the monitoring hole edge, thereby achieving a sealing effect.

[0013] Preferably, the sealing cover ring is a flexible flat sealing ring body. The inner diameter of the sealing ring is substantially equal to the hole diameter of the monitoring hole. The trumpet-shaped outer flange is fixed on the edge of the monitoring hole through a connecting piece or an adhesive layer. The connecting piece is a rivet or a screw.

[0014] As described above, by additionally providing a sealing cover ring on the lower edge of the monitoring cover, the inner flange wing plate can cover the cylindrical upper flange of the sealing ring when the monitoring cover is buckled on the sealing ring of the monitoring hole edge, thereby achieving a sealing effect.

[0015] Since the experimental equipment is stationed in the field for a long time for measurement, the complex field environment is easy to cause corrosion of the equipment, and the motor is the main power element of the measurement equipment, and whether the motor works normally directly affects the normal operation of the whole equipment. In order to improve the weather resistance, service life and reliability of the field measurement equipment, it is necessary to protect the motor of the field measurement equipment. Therefore, it is urgent to design a motor protection structure for field experimental equipment.

[0016] Further, the driving mechanism of the monitoring device comprises a reduction motor and a driving arm, and the motor protection structure comprises a cylindrical cover and a seat body. The cylindrical cover is an integrally formed cylindrical shell structure, one end of the cylindrical cover is a closed end, the other end is a connecting end, and the inner wall of the connecting end is provided with an internal thread. The seat body is provided with a cylindrical connecting table, and the outer periphery of the cylindrical connecting table is provided with an external thread. The internal thread of the connecting end of the cylindrical cover and the external thread on the cylindrical connecting table can be screwed together. A sealing ring is further sleeved on the cylindrical connecting table, and the connecting end of the cylindrical cover can press the sealing ring tightly on the seat body at the root of the cylindrical connecting table when the connecting end of the cylindrical cover is screwed onto the cylindrical connecting table.

[0017] Preferably, the outer wall of the connecting end of the cylindrical cover gradually expands to form a wall thickness expansion end. The motor is installed in the inner cavity of the cylindrical cover, and the motor is installed on the cylindrical connecting table. The peripheral part of the closed end of the cylindrical cover is provided with a rounded corner.

[0018] As described above, by designing the cylindrical cover body into an integral structure, directly arranging the cylindrical cover body on the columnar connecting table of the seat body, and matching with the sealing ring, the motor in the cylindrical cover body is well protected. Meanwhile, all the connecting structures are arranged in the inner cavity of the cylindrical cover body, and each connecting part is comprehensively sealed and protected, so that the connecting structures are prevented from being corroded by the outside, the corrosion and damage of the motor and the connecting structures in the complex environment are solved, the weather resistance, service life and reliability of the motor on the field measurement equipment are improved, and the weather resistance, service life and reliability of the field measurement equipment are improved.

[0019] Since the seat body of the motor is directly affected by the inaccurate positioning of the installation position, the movement accuracy of the executing part is affected, and the accuracy of the detection data is affected. Therefore, the installation structure of the motor seat needs to be improved.

[0020] The lower side of the seat body is provided with mounting positioning pins and screw holes, and the seat body is locked on the base through the screwing element from bottom to top. The mounting positioning pins and screw holes on the lower side of the seat body are arranged alternately. The screwing element is an internal hexagonal bolt. The lower end of the positioning pin does not exceed the lower surface of the base. The mounting positioning pins and screw holes are arranged on the lower side of the seat body, which fully ensures the accuracy of the installation position of the seat body, improves the movement accuracy of the executing part and the accuracy of the detection data.

[0021] The experimental equipment of the present application can not only be used to monitor the related parameters of soil respiration below the ground, but also be used to monitor the carbon flux change parameters above the ground, and two groups of monitoring data of aboveground and underground are obtained, which is beneficial to further study the relationship of soil respiration and has important significance for promoting the research of carbon flux of terrestrial ecosystem. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the carbon flux synchronous measurement experimental equipment in the embodiment.

[0023] Figure 2 It is a structural schematic view of the overhanging water bead anti-inversion structure in the embodiment.

[0024] Figure 3 It is a three-dimensional structural schematic view of the monitoring device in the embodiment.

[0025] Figure 4 It is a schematic view of the cooperation structure of the sealing ring and the sealing cover ring in the embodiment.

[0026] Figure 5 It is a structural schematic view of the motor protection structure in the embodiment.

[0027] Figure 6 It is a structural schematic view of the precise installation structure of the motor seat in the embodiment.

[0028] Explanation of reference numerals: 1 - monitoring device 2 - transparent cylindrical body 3 - partition 3.1 - perforation 4 - liquid supply interface 5 - monitoring cover 6 - interface 7 - inverted water bead anti-suckback structure 7.1 - hose 7.2 - tee joint 7.3 - water-air separation chamber 7.4 - inverted water bead 8 - sealing ring 8.1 - cylindrical upper flange 8.2 - flared outer flange 9 - sealing cover ring 10 - cylindrical cover 11 - base 11.1 - cylindrical connecting platform 12 - sealing ring 13 - speed-reducing motor 14 - drive arm 15 - positioning pin and screw hole 16 - screw 17 - base 18 - plant 19 - soil portion. DETAILED DESCRIPTION

[0029] In order to enable the technical content of the present application to be understood by those of ordinary skill in the art, the present application is described in detail below with reference to the accompanying drawings.

[0030] As shown in Figure 1 , the carbon flux synchronous measurement experimental equipment of the present application comprises a monitoring device 1 for studying soil carbon flux and a transparent cylindrical body 2 for cultivating plants, and a light-blocking cloth can be sleeved outside the transparent cylindrical body to carry out experimental research under lightless conditions. A partition 3 is arranged in the middle of the transparent cylindrical body, for separating the ground portion of the plant 18 and the soil portion 19 in two independent chambers, and a liquid supply interface 4 for supplying nutrient solution to the plant is arranged on the side wall of the chamber for accommodating the soil portion of the plant, and a perforation 3.1 for the plant to pass through is arranged on the partition 3, and the partition 3 is composed of multiple single-layer partition layers which are arranged in a staggered manner, and the single-layer partition layer is composed of two thin plates with semicircular holes. The two ends of the transparent cylindrical body 2 are respectively connected to the monitoring holes of the monitoring device 1.

[0031] The experimental equipment can be used not only to monitor the related parameters of soil respiration below the ground, but also to monitor the change parameters of carbon flux above the ground, and at the same time, two groups of monitoring data of aboveground and underground are obtained, which is beneficial to further study the relationship of soil respiration and has important significance for promoting the research of carbon flux of terrestrial ecosystems.

[0032] As shown in Figure 1 and Figure 2As shown in the figure, the monitoring cover 5 of the monitoring device 1 is provided with an interface 6 for installing monitoring sensors, and a pendant water bead anti-suckback structure 7 is installed on the interface 6, which comprises a hose 7.1 and a tee joint 7.2. The middle part of the hose 7.1 is further provided with a water-air separation chamber 7.3, and a water-air separation layer is arranged in the water-air separation chamber 7.3. The tee joint 7.2 comprises a middle joint and left and right joints on both sides of the middle joint. The upper end of the hose 7.1 is connected to the monitoring sensor interface, and the middle joint of the tee joint 7.2 is connected to the lower end of the hose. Due to the twisting of the hose 7.1 itself and the unevenness of the equipment installation position, the left and right joints of the tee joint at the lower end of the hose 7.1 cannot be in a horizontal position, and the left and right joints must be in a state of one high and one low. Thus, the left and right joints are automatically separated from each other in function, thereby achieving the pendant water bead 7.4 anti-suckback effect.

[0033] As shown in the figure, Figure 3 and Figure 4 The monitoring hole edge of the monitoring device 1 is provided with a sealing ring 8, which comprises a cylindrical upper flange 8.1 and a trumpet-shaped outer flange 8.2 connected to the lower end of the cylindrical upper flange. The lower edge of the monitoring cover 5 of the monitoring device 1 is further provided with a sealing cover ring 9, the inner side of which extends to the inner cavity of the monitoring cover, forming an inner flange wing plate. When the monitoring cover is buckled on the sealing ring on the edge of the monitoring hole, the inner flange wing plate can cover the cylindrical upper flange 8.1 of the sealing ring, achieving a sealing effect.

[0034] In this embodiment, the sealing cover ring 9 is a flexible flat sealing ring body. The inner diameter of the sealing ring is approximately equal to the hole diameter of the monitoring hole. The trumpet-shaped outer flange is fixed on the edge of the monitoring hole through a connecting piece or an adhesive layer. The connecting piece is a riveting piece or a screwing piece.

[0035] As shown in the figure, Figure 3 and Figure 5 The drive mechanism of the monitoring device 1 comprises a speed reduction motor 13 and a drive arm 14. The speed reduction motor is provided with a motor protection structure, which comprises a cylindrical cover 10 and a seat body 11. The cylindrical cover 10 is an integrally formed cylindrical shell structure, one end of which is a closed end, and the other end is a connecting end. The inner wall of the connecting end is provided with internal threads. The seat body 11 is provided with a cylindrical connecting table 11.1, the outer periphery of which is provided with external threads. The internal threads of the connecting end of the cylindrical cover 10 and the external threads on the cylindrical connecting table 11.1 can be screwed together. A sealing ring 12 is further sleeved on the cylindrical connecting table 11.1. When the connecting end of the cylindrical cover is screwed onto the cylindrical connecting table 11.1, the connecting end of the cylindrical cover can press the sealing ring 12 tightly against the seat body at the root of the cylindrical connecting table.

[0036] The connecting end outer wall of the cylindrical cover 10 is gradually enlarged to form a wall thickness enlarged end. The motor 13 is installed in the inner cavity of the cylindrical cover 10, and the motor 13 is installed on the columnar connecting platform. The closed end peripheral portion of the cylindrical cover 10 is provided with a rounded corner.

[0037] As shown in Figure 3 and Figure 6 The lower side of the seat body 11 is provided with mounting positioning pins and screw holes 15, and the seat body is locked on the base 17 of the monitoring device 1 by a screwing piece from bottom to top. The mounting positioning pins and screw holes 15 on the lower side of the seat body are arranged alternately. The screwing piece 16 is an inner hexagonal bolt. The lower end of the positioning pin does not exceed the lower surface of the base. The mounting positioning pins and screw holes are provided on the lower side of the seat body 11, which fully ensures the accuracy of the installation position of the seat body 11, improves the movement accuracy of the execution component and the accuracy of the detection data.

[0038] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A simultaneous carbon flux measurement experimental device, comprising a monitoring device for studying soil carbon flux and a transparent cylindrical body for cultivating plants, characterized in that: A partition is provided in the middle of the transparent cylindrical body to separate the above-ground part of the plant and the soil part into two independent chambers. The partition is composed of multiple layers of staggered single-layer partitions, each single-layer partition being made of two thin plates with semi-circular holes joined together. The side wall of the chamber containing the soil part of the plant is also provided with a nutrient solution supply interface for supplying the plant. The partition has perforations to allow the plant to pass through. Both ends of the transparent cylindrical body are connected to the monitoring ports of a monitoring device. The monitoring device's monitoring cover is provided with an interface for installing monitoring sensors, and a water droplet is installed on the interface to prevent tipping. The anti-backflow structure for suspended water droplets includes a flexible hose and a T-joint. The T-joint includes a middle connector and left and right connectors located on either side of the middle connector. The upper end of the flexible hose is connected to the monitoring sensor interface, and the middle connector of the T-joint is connected to the lower end of the flexible hose. Due to the twisting of the flexible hose and the unevenness of the equipment installation position, the left and right connectors of the T-joint located at the lower end of the flexible hose cannot be in a horizontal position. The left and right connectors will inevitably be in a state where one side is higher than the other. This forms a state in which the functions of the left and right connectors are automatically separated, thereby achieving the anti-backflow function of the suspended water droplets of the detection head.

2. The experimental apparatus for simultaneous carbon flux measurement according to claim 1, characterized in that: The hose is also provided with a water-gas separation chamber in the middle, and a water-gas separation layer is provided in the water-gas separation chamber.

3. The experimental apparatus for simultaneous carbon flux measurement according to claim 1, characterized in that: A sealing ring is installed on the edge of the monitoring hole of the monitoring device. The sealing ring includes a cylindrical upper flange and a flared outer flange connected to the lower end of the cylindrical upper flange. A sealing cover ring is also provided on the lower edge of the monitoring cover of the monitoring device. The inner side of the sealing cover ring extends into the inner cavity of the monitoring cover to form an inner flange wing plate. When the monitoring cover is fastened to the sealing ring on the edge of the monitoring hole, the inner flange wing plate can cover the cylindrical upper flange of the sealing ring to achieve a sealing effect.

4. The experimental apparatus for simultaneous measurement of carbon flux according to claim 3, characterized in that: The sealing ring is a flexible, flat sealing ring. The inner diameter of the sealing ring is approximately equal to the diameter of the monitoring hole. The flared outer flange is fixed to the edge of the monitoring hole by a connector or adhesive layer. The connector is a riveted or screwed connector.

5. The experimental apparatus for simultaneous measurement of carbon flux according to claim 1, characterized in that: The driving mechanism of the monitoring device includes a geared motor and a driving arm. The geared motor is equipped with a motor protection structure, which includes a cylindrical cover and a base. The cylindrical cover is an integrally formed cylindrical shell structure, with one end being a closed end and the other end being a connecting end. The inner wall of the connecting end is provided with internal threads. The base is provided with a columnar connecting platform, and the outer circumference of the columnar connecting platform is provided with external threads. The internal threads of the connecting end of the cylindrical cover and the external threads on the columnar connecting platform can be screwed together. A sealing ring is also fitted on the columnar connecting platform. When the connecting end of the cylindrical cover is screwed onto the columnar connecting platform, the end of the connecting end of the cylindrical cover can press the sealing ring tightly against the base at the root of the columnar connecting platform.

6. The experimental apparatus for simultaneous measurement of carbon flux according to claim 5, characterized in that: The lower side of the base is provided with a mounting positioning pin and a screw hole, and the base is locked to the base by a screw from bottom to top.

7. The experimental apparatus for simultaneous measurement of carbon flux according to claim 5, characterized in that: The outer wall of the connecting end of the cylindrical cover gradually expands to form an enlarged wall thickness end. The motor is installed in the inner cavity of the cylindrical cover and is mounted on the columnar connecting platform. The closed end of the cylindrical cover is provided with rounded corners.

8. The experimental apparatus for simultaneous measurement of carbon flux according to claim 5, characterized in that: The mounting positioning pins and screw holes on the lower side of the base are arranged alternately, and the lower end of the positioning pin does not extend beyond the lower surface of the base.

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