Device and method for in-situ zoned detection of soil organic carbon decomposition temperature sensitivity

Abstract

The invention discloses a device and a method for in-situ zoned detection of soil organic carbon decomposition temperature sensitivity. The device comprises a gas storage cylinder and a soil holding cylinder. A first cover plate is arranged at the top of the gas storage cylinder, and a gas collecting hole is formed in the first cover plate and used for mounting the piston type gas collecting cylinder; and a second cover plate is arranged between the gas storage cylinder and the soil holding cylinder and is provided with a vent hole. An internal partition plate is arranged between the first cover plate and the second cover plate, the upper portion is located in the gas storage cylinder, the lower end is located in the soil containing cylinder, and the space in the gas storage cylinder is divided into three spaces with the same volume. The first cover plate and the second cover plate are both provided with temperature and humidity sensor mounting holes used for mounting temperature and humidity sensors and connected with a monitoring device through data lines. During detection, an undisturbed undisturbed soil core sample is placed in the soil holding cylinder so as to maintain in-situ reaction characteristics; the in-situ zoning detection of the soil organic carbon decomposition temperature sensitivity is realized through zoning collection of reaction gas.

Description

Technical Field

[0001] The present invention relates to the technical field of soil organic carbon decomposition temperature sensitivity testing, and in particular to a device and a method for in-situ zoning detection of soil organic carbon decomposition temperature sensitivity. Background Art

[0002] Soil organic carbon (SOC) is the largest carbon pool in terrestrial ecosystems, and even a small change in its content will significantly affect the global carbon cycle. In the context of climate warming, the temperature sensitivity of SOC decomposition (Q 10 ) is of great significance for the accurate assessment of global carbon emissions. 10 The detection methods all use sieved soil to detect the changes in CO2 emissions under simulated warming conditions. Under these reaction conditions, the microenvironment of soil microbial growth is completely different from the in situ conditions, and will be in full contact with the microorganisms present in the laboratory, which may cause significant changes in the composition, content and function of the native soil microbial community, thereby affecting Q 10 On the other hand, temperature changes have a great influence on Q 10 The effect of Q may vary at different locations in the soil, but using dispersed soil particles to detect Q 10 This difference cannot be reflected.

[0003] Therefore, a device for in-situ soil sampling reaction is designed, and partition blocks are set to monitor the changes in soil temperature and humidity in real time, and a gas collection device is used in partitions to restore the in-situ soil microbial growth conditions to the greatest extent, and reflect the differences in the decomposition of soil SOC at different depths and regions to temperature changes, so as to achieve the in-situ soil Q 10 Through multi-parameter synchronous monitoring, automated data collection and zoned gas collection, it can provide more comprehensive and accurate experimental data support for the evaluation and model calculation of climate-SOC feedback. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a device and method for in-situ zoning detection of soil organic carbon decomposition temperature sensitivity.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A device for in-situ zoning detection of soil organic carbon decomposition temperature sensitivity comprises a gas storage cylinder and a soil-carrying cylinder, the gas storage cylinder and the soil-carrying cylinder are arranged up and down, a first cover plate is arranged on the top of the gas storage cylinder, a second cover plate is arranged between the gas storage cylinder and the soil-carrying cylinder, and a bottom plate is arranged at the bottom of the soil-carrying cylinder; the gas storage cylinder and the soil-carrying cylinder are installed in a fixed bracket, the first cover plate, the second cover plate and the bottom plate are all provided with bracket adapter holes, and the first cover plate, the second cover plate and the bottom plate are connected by a fixed bracket and screws;

[0007] The upper part of the internal partition is arranged in the gas storage cylinder, the lower end is located in the soil cylinder, and the lower edge is close to the soil in the soil cylinder; the internal partition divides the space above the gas storage cylinder and the soil in the soil cylinder into three spaces of equal volume;

[0008] In each corresponding spatial position of the three divided spaces, the first cover plate and the second cover plate are provided with temperature and humidity sensor installation holes for installing the temperature and humidity sensors, and the temperature and humidity sensors are connected to the monitoring device through data cables; the first cover plate is also provided with a gas collection cylinder installation hole for installing a piston-type gas collection cylinder; the second cover plate is also provided with ventilation holes.

[0009] The internal partition comprises a cylinder, and rectangular plates are symmetrically arranged on both sides of the outer wall of the cylinder.

[0010] The temperature and humidity sensor mounting hole and the gas collection tube mounting hole on the second cover plate are both equipped with No. 1 rubber plugs; the temperature and humidity sensor mounting hole on the first cover plate is equipped with No. 2 rubber plugs.

[0011] The method for in-situ partition detection of soil organic carbon decomposition temperature sensitivity adopts the device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity, and the method comprises the following steps:

[0012] S1. Install the bottom plate at the bottom of the soil tube and place the original soil core; install the internal partition close to the soil core sample to divide the soil into three areas of equal volume;

[0013] S2, sequentially install the second cover plate, the gas storage cylinder and the first cover plate, and fix them by fixing brackets and screws; the internal partition divides the space inside the gas storage cylinder into three spaces of equal volume corresponding to the reaction soil body;

[0014] S3. Install the temperature and humidity sensor and connect it to the monitoring device via a data cable; install a piston-type gas collection cylinder;

[0015] S4. Adjust the ambient temperature to the set value, and record the changes in soil temperature and humidity at different locations in real time; use a piston-type gas collection cylinder to collect gas from different areas of the gas storage cylinder at a predetermined time;

[0016] S5. Detect changes in carbon content in the gas, establish a formula for soil temperature changes and carbon dioxide emission rate, and evaluate the temperature sensitivity of soil organic carbon decomposition; and by comparing the differences in this indicator in soils in different regions, study the regional differences in soil organic carbon decomposition temperature sensitivity.

[0017] The beneficial effects of the present invention are as follows: the in-situ conditions can be simulated in the laboratory, and the temperature sensitivity of soil organic carbon decomposition can be detected in different zones. Undisturbed original soil core samples are used, and the gas storage cylinder and part of the multiplication soil cylinder are divided into three areas of equal volume by internal partitions to maintain the in-situ reaction characteristics. During the simulated temperature change process, the soil temperature and humidity change curve is monitored in real time, and the gas is collected into a piston-type gas collection cylinder through the internal and external pressure difference to accurately calculate the response rate of different soil zones to temperature changes. The present invention can provide more comprehensive and accurate experimental data support for research fields such as soil science and environmental science. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the first cover plate structure of the present invention;

[0020] Figure 3 is a schematic diagram of the second cover plate structure of the present invention;

[0021] Figure 4 It is the internal schematic diagram of the present invention;

[0022] Figure 5 It is a schematic diagram of the position of the temperature and humidity sensor of the present invention;

[0023] Figure 6 It is a schematic diagram of the positions of the cover plate and the cylinder of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal partition dividing the cylinder area of ​​the present invention;

[0025] Markings in the figure: 1. Fixed bracket; 2. Screws; 3. Temperature and humidity sensor; 4. Data cable; 5. Piston-type gas collecting cylinder; 6. Temperature and humidity sensor mounting hole; 7. Gas collecting cylinder mounting hole; 8. Vent hole; 9. Internal partition; 10. First cover plate; 11. Second cover plate; 12. Bracket adapter hole; 13. Soil tube; 14. Gas storage cylinder; 15. Bottom plate; 16. No. 1 rubber plug; 17. No. 2 rubber plug. DETAILED DESCRIPTION

[0026] ,like Figure 1-Figure 7As shown, a device for in-situ zoning detection of soil organic carbon decomposition temperature sensitivity comprises a gas storage cylinder 14 and a soil-carrying cylinder 13, the gas storage cylinder 14 and the soil-carrying cylinder 13 are arranged up and down, a first cover plate 10 is arranged on the top of the gas storage cylinder 14, a second cover plate 11 is arranged between the gas storage cylinder 14 and the soil-carrying cylinder 13, and a bottom plate 15 is arranged at the bottom of the soil-carrying cylinder 13; the gas storage cylinder 14 and the soil-carrying cylinder 13 are installed in a fixed bracket 1, the first cover plate 10, the second cover plate 11 and the bottom plate 15 are all provided with bracket adapter holes 12, and the first cover plate 10, the second cover plate 11 and the bottom plate 15 are connected by a fixed bracket 1 and screws 2;

[0027] The upper part of the internal partition 9 is arranged in the gas storage cylinder 14, and the lower end is located in the soil cylinder 13, and the lower edge is close to the soil in the soil cylinder 13; the internal partition 9 divides the space above the gas storage cylinder 14 and the soil in the soil cylinder 13 into three spaces of equal volume;

[0028] In each corresponding space position of the three divided spaces, the first cover plate 10 and the second cover plate 11 are provided with a temperature and humidity sensor installation hole 6 for installing the temperature and humidity sensor 3, and the temperature and humidity sensor 3 is connected to the monitoring device through a data line 4; the first cover plate 10 is also provided with a gas collection cylinder installation hole 7 for installing a piston-type gas collection cylinder 5; the second cover plate 11 is also provided with a vent hole 8;

[0029] The internal partition 9 comprises a cylinder, and rectangular plates are symmetrically arranged on both sides of the outer wall of the cylinder.

[0030] The temperature and humidity sensor mounting hole 6 and the gas collection tube mounting hole 7 on the second cover plate 11 are both provided with a No. 1 rubber plug 16 ; the temperature and humidity sensor mounting hole 6 of the first cover plate 10 is provided with a No. 2 rubber plug 17 .

[0031] The fixed bracket 1, soil-carrying cylinder 13, gas storage cylinder 14, first cover plate 10 and second cover plate 11 of the present invention are detachable and can be assembled after disassembly. The second cover plate 11 covers the soil-carrying cylinder 13; the gas storage cylinder 14 is bonded to the second cover plate 11 at the bottom, the first cover plate 10 covers the gas storage cylinder 14, the fixed bracket 1 is fixed to the whole device into a whole by using screws through the bracket adapter hole 12 to ensure the sealing of the whole device.

[0032] The internal partition 9 is located in the entire gas storage cylinder 14 and part of the soil cylinder 13. Figure 7 The internal partition 9 is composed of a cylinder and two rectangular plates on both sides, and the lower end is close to the soil, which divides the gas storage cylinder 14 and the part of the soil cylinder 13 into three equal spaces, ensuring that the volume of the three spaces is the same, so that the changes in the moisture content, temperature and gas generation in each zone of the soil can be measured under the change of external temperature. The material of the partition is made of gypsum to ensure that its thermal conductivity is close to that of the soil.

[0033] like Figure 2 A temperature and humidity sensor mounting hole 6 is punched on the first cover plate 10 for inserting the temperature and humidity sensor 3, a gas collection tube mounting hole 7 is punched for inserting the piston-type gas collection tube 5 into the gas storage tube 14, a bracket adaptation hole 12 is punched for inserting and disassembling the fixed bracket 1, and the temperature and humidity sensor mounting hole 6 and the gas collection tube mounting hole 7 are plugged with the adapted No. 1 rubber plug 16 and No. 2 rubber plug 17 to ensure that the sealing of the entire device can be guaranteed after the temperature and humidity sensor 3 and the piston-type gas collection tube 5 are inserted, and the temperature and humidity sensor mounting hole 6 and the gas collection tube mounting hole 7 respectively correspond to the three spaces separated by the internal partition 9.

[0034] like Figure 3 The temperature and humidity sensor mounting hole 6 and the gas collecting cylinder mounting hole 7 on the second cover plate 11, the positions and quantities of the No. 1 rubber plug and the No. 2 rubber plug are the same as those of the first cover plate 10 and correspond in position. The vent hole 8 is on the second cover plate 11, so that the gas generated by the life activities of soil microorganisms is transmitted from the soil cylinder 13 to the gas storage cylinder 14, and then the gas generated by the soil is pressed into the piston-type gas collecting cylinder 5 by the pressure difference between the inside and outside of the cylinder. The cylinder holes 3 are distributed corresponding to the three spaces separated by the internal partition plate 9 to realize the zoned collection of gas.

[0035] The data line 4 is connected to the temperature and humidity sensor 3 to transmit data such as soil temperature and moisture content to the computer in real time.

[0036] This device is suitable for probe type sensors and is not limited to measuring only temperature and moisture content changes.

[0037] The method for in-situ partition detection of soil organic carbon decomposition temperature sensitivity adopts the device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity, and the method comprises the following steps:

[0038] S1. Install the bottom plate 15 at the bottom of the soil tube 13 and place the original soil core; install the internal partition 9 close to the soil core sample to divide the soil into three areas of equal volume;

[0039] S2, sequentially install the second cover plate 11, the gas storage cylinder 14 and the first cover plate 10, and fix them by fixing the bracket 1 and the screw 2; the internal partition 9 divides the space inside the gas storage cylinder 14 into three spaces of equal volume corresponding to the reaction soil body;

[0040] S3, install the temperature and humidity sensor 3, and connect it to the monitoring device through the data line 4; install the piston type gas collection cylinder 5;

[0041] S4, adjusting the ambient temperature to the set value, and recording the changes in soil temperature and humidity at different locations in real time; using the piston-type gas collection cylinder 5 to collect gas from different areas of the gas storage cylinder 14 at a predetermined time;

[0042] S5. Detect changes in carbon content in the gas, establish a formula for soil temperature changes and carbon dioxide emission rate, and evaluate the temperature sensitivity of soil organic carbon decomposition; and by comparing the differences in this indicator in soils in different regions, study the regional differences in soil organic carbon decomposition temperature sensitivity.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity, characterized in that: The invention comprises a gas storage cylinder (14) and a soil-carrying cylinder (13), wherein the gas storage cylinder (14) and the soil-carrying cylinder (13) are arranged up and down, a first cover plate (10) is arranged on the top of the gas storage cylinder (14), a second cover plate (11) is arranged between the gas storage cylinder (14) and the soil-carrying cylinder (13), and a base plate (15) is arranged on the bottom of the soil-carrying cylinder (13); the gas storage cylinder (14) and the soil-carrying cylinder (13) are installed in a fixed bracket (1), the first cover plate (10), the second cover plate (11) and the base plate (15) are all provided with bracket adapting holes (12), and the first cover plate (10), the second cover plate (11) and the base plate (15) are connected by means of the fixed bracket (1) and screws (2); The upper part of the internal partition (9) is arranged in the gas storage cylinder (14), the lower end is located in the soil cylinder (13), and the lower edge is in close contact with the soil in the soil cylinder (13); the internal partition (9) divides the space above the gas storage cylinder (14) and the soil in the soil cylinder (13) into three spaces of equal volume; In each corresponding spatial position of the three divided spaces, the first cover plate (10) and the second cover plate (11) are each provided with a temperature and humidity sensor mounting hole (6) for mounting the temperature and humidity sensor (3), and the temperature and humidity sensor (3) is connected to the monitoring device via a data line (4); the first cover plate (10) is also provided with a gas collection cylinder mounting hole (7) for mounting the piston-type gas collection cylinder (5); and the second cover plate (11) is also provided with a vent hole (8).

2. The device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity according to claim 1 is characterized in that: The internal partition (9) comprises a cylinder, and rectangular plates are symmetrically arranged on both sides of the outer wall of the cylinder.

3. The device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity according to claim 1 is characterized in that: The temperature and humidity sensor mounting hole (6) and the gas collection tube mounting hole (7) on the second cover plate (11) are both provided with a No. 1 rubber plug (16); and the temperature and humidity sensor mounting hole (6) of the first cover plate (10) is provided with a No. 2 rubber plug (17).

4. A method for in-situ zoning detection of soil organic carbon decomposition temperature sensitivity, characterized in that: The device for in-situ partition detection of soil organic carbon decomposition temperature sensitivity according to any one of claims 1 to 3 is used, and the method comprises the following steps: S1. Install the bottom plate (15) at the bottom of the soil tube (13) and place the original soil core; install the internal partition (9) close to the soil core sample to divide the soil into three areas of equal volume; S2, sequentially installing the second cover plate (11), the gas storage cylinder (14) and the first cover plate (10), and fixing them by means of a fixing bracket (1) and screws (2); the internal partition plate (9) divides the space inside the gas storage cylinder (14) into three spaces of equal volume corresponding to the reaction soil body; S3, installing a temperature and humidity sensor (3) and connecting it to a monitoring device via a data line (4); installing a piston-type gas collection cylinder (5); S4, adjusting the ambient temperature to a set value, and recording the changes in soil temperature and humidity at different locations in real time; using a piston-type gas collection cylinder (5) to collect gas from different areas of the gas storage cylinder (14) at a predetermined time; S5. Detect changes in carbon content in the gas, establish a formula for soil temperature changes and carbon dioxide emission rate, and evaluate the temperature sensitivity of soil organic carbon decomposition; and by comparing the differences in this indicator in soils in different regions, study the regional differences in soil organic carbon decomposition temperature sensitivity.

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