Static box base and method for monitoring methane emission of rice plants in situ

Abstract

The invention discloses a static box base for in-situ monitoring of methane emission of rice plants, which comprises a plug connector inserted into soil around rice, an isolating membrane covering the top of the plug connector and used for isolating gas emitted by the soil, and a connecting piece in butt joint with the plug connector and a static box, and the isolating membrane is provided with a hole for the rice to pass through. The static box is inserted into a water seal tank at the top of the connecting piece, and water injection can maintain air tightness in the monitoring process. On the basis, the invention discloses a monitoring method which comprises the following steps: inserting a plug connector into soil, enabling to-be-monitored rice to penetrate through a hole in an isolating membrane, enabling the isolating membrane to be attached to a stem of a rice plant, installing and fastening a connecting piece, and placing a static box to start monitoring; after one-time monitoring is finished, the plug connector is left in the soil, and only the steps need to be repeated for next-time monitoring. The method can isolate the interference of exhaust gas in the soil, and the monitoring data is more accurate; the connector clip can be repeatedly used after being mounted once, so that the influence of measurement activity on rice growth is reduced; each monitoring preparation time is short, operation is convenient, and the process is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural ecological environment monitoring, and in particular to a static chamber base and method for in-situ monitoring of methane emissions from rice plants. Background Art

[0002] Global problems such as the melting of glaciers, the rise of sea levels, and the increase in extreme climate events are caused by climate warming. The excessive emission of greenhouse gases is one of the main culprits of global warming. Methane is the second largest greenhouse gas, and the paddy field ecosystem is one of the important global methane emission sources. Most of the methane is emitted into the atmosphere through rice plants. Accurately monitoring the methane emission flux and pattern of rice plants can provide a scientific basis for the breeding of low-methane-emission rice varieties, the reduction of greenhouse gas emissions in the paddy field ecosystem, and the formulation of climate change response strategies. The commonly used measurement methods for greenhouse gas emissions at the plot scale of the paddy field ecosystem include the static chamber-gas chromatography method, the static chamber-gas analyzer method, etc. These two methods are both measured by combining a static chamber and a supporting base. However, the traditional static chamber method cannot accurately distinguish the methane emission fluxes from the soil and the rice plants themselves. The methane emissions of rice vary significantly during different growth stages. The existing zonal monitoring methods either keep the rice in the monitoring environment all the time, seriously affecting the natural growth of rice and resulting in distorted monitoring data; or select multiple different growth time periods for monitoring, but the process of installing the static chamber and the base is cumbersome, time-consuming, and inconvenient to operate. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a static chamber base for in-situ monitoring of gas emissions from rice plants, which can isolate the interference of soil-emitted gases and has a fast installation speed. Another object of the present invention is to provide a methane emission monitoring method with little impact on the growth of rice plants.

[0004] Technical Solution: A static chamber base for in-situ monitoring of methane emissions from rice plants according to the present invention is provided with a plug-in member 1 inserted into the soil around the rice from bottom to top, an isolation membrane 2 covering the top of the plug-in member to isolate the soil-emitted gases, and a connecting member 3 with its lower end docked with the plug-in member and its upper end docked with the static chamber. The isolation membrane 2 is provided with holes through which the rice plants can pass. The docking method between the connecting member and the plug-in member is detachable.

[0005] Further, the bottom of the connecting member 3 is provided with a fixing ring 31 for connecting the plug-in member and a buckle 32 provided on the fixing ring. The plug-in member 1 is provided with a buckle joint 11 for cooperating with the buckle. Positioning holes are provided on the periphery of the plug-in member 1 and the periphery of the connecting member 3. During installation, the plug-in member and the connecting member are completely overlapped through the positioning holes, and then a positioning pin is inserted into the positioning holes to prevent position deviation; then the buckle is buckled, and during the monitoring process, the plug-in member and the connecting member are firmly connected.

[0006] Furthermore, a water seal groove 33 for placing the static box and ensuring the airtightness of the connection is provided at the top of the connecting member 3.

[0007] Preferably, the aperture in the middle of the isolation membrane can be adjusted according to the stem diameter of rice plants at different growth stages. The stem diameters of rice plants are different at different times. The material of the isolation membrane is selected as an ultra-thin flexible plastic film, which is impermeable to water and air and has elasticity. The rice plant passes through the hole in the isolation membrane, the isolation membrane is laid flat on the top of the socket, and the isolation membrane is attached to the lower part of the stem of the rice plant so that the gas below the isolation membrane cannot enter above the isolation membrane, so as to avoid affecting the gas monitoring of the rice plant. The in-situ monitoring method for methane emission of rice plants described in the present invention includes the following steps:

[0008] (a) Select the rice plants to be measured, insert the socket into the soil, and place the rice plants to be measured in the middle of the socket;

[0009] (b) The rice plants to be measured pass through the holes in the isolation membrane, the isolation membrane is laid flat on the top of the socket, and the isolation membrane is attached to the lower part of the stem of the rice plant until the gas below the isolation membrane cannot enter above the isolation membrane;

[0010] (c) Install the connecting member, fasten the buckle, place the static box in the water seal groove, add water for sealing, and start monitoring;

[0011] (d) After the monitoring is completed, remove the static box, the connecting member, and the isolation membrane, and keep the socket in the soil;

[0012] (e) When measuring next time, repeat steps (b) to (d).

[0013] Furthermore, in step (b), the isolation membrane can be wound around the rice plant in a circle, and the isolation membrane is tied to the rice plant with a rope. In this way, the isolation membrane is attached to the lower part of the stem of the rice plant to the greatest extent. The rope is made of an elastic material to minimize damage to the rice plant.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: (1) It can accurately monitor the methane gas emission flux of rice plants in-situ and exclude the influence of soil gas emission around the roots of rice; (2) The socket is inserted once and can be reused. The assembly process is simple and fast, and it can meet the high-frequency monitoring of methane emissions of rice at different times; (3) The disturbance to the soil around the rice during the monitoring process is small, which does not affect the normal growth of the rice, and the methane emission data of the rice plants close to the real situation in the field can be obtained. Description of the Drawings

[0015] Figure 1 It is the assembly schematic diagram of the present invention;

[0016] Figure 2Schematic diagram of the structure after assembly of the present invention;

[0017] Figure 3 Schematic diagram of the plug-in part in the present invention. Specific embodiments

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0019] As shown in the figure, a static box base for in-situ monitoring of methane emissions from rice plants according to the present invention includes a plug-in part 1, an isolation film 2, a connecting part 3, a fixing ring 31, a buckle 32, a water seal groove 33, a buckle joint 11 and a sealing ring 12. The plug-in part 1 can be circular or designed as a rectangle with a hollow in the middle. The size of the plug-in part can be determined according to the area to be monitored and the size of the static box. The periphery of the plug-in part is provided with positioning holes, and the number of positioning holes is set according to needs. Correspondingly, the periphery of the connecting part 3 is also provided with positioning holes. When installing and matching, the positioning holes coincide, and a positioning pin is inserted, and the plug-in part and the connecting part can be connected. The top of the plug-in part is provided with a sealing ring 12. There is an isolation film 2 between the plug-in part and the connecting part to prevent the gas emitted from the soil inside the plug-in part from entering the static box above the isolation film 2, so as to realize that the static box only monitors the gas emissions of rice plants. The isolation film 2 is provided with holes through which rice plants can pass, and the hole diameter can be adjusted according to the stem diameter of rice plants in different growth periods; the isolation film 2 is preferably a PTFE composite film, which has both flexibility and certain elasticity, is impermeable to water and air. When it is tightened around the lower part of the rice stem, it can fit well with the rice plant, does not damage the rice stem, and can also isolate the gas emitted from the soil. The size of the isolation film should be larger than the size of the top of the plug-in part, so that the isolation film has enough amount to surround the rice plant stem when fitting the rice plant. Other materials with similar effects can also be selected for the isolation film 2.

[0020] The shape of the connecting part 3 should be the same as that of the plug-in part. The bottom of the connecting part is provided with a fixing ring 31, and buckles 32 are evenly distributed on the fixing ring. The buckles 32 are used to fix the connecting part and the plug-in part. The number of buckles can be increased or decreased according to needs. At the corresponding position of the plug-in part, a buckle joint 11 is correspondingly provided. When the buckle 32 is buckled into the buckle joint 11, the connection between the connecting part and the plug-in part can be realized; when disassembling, only the buckle needs to be opened, and the installation and disassembly speeds are both very fast. The top of the connecting part 3 is provided with a water seal groove 33, and the depth of the water seal groove can be determined according to actual needs, as long as it is ensured that the static box has a sealing effect after adding water when placed in the water seal groove. The plug-in part and the connecting part are generally made of corrosion-resistant and durable materials, such as stainless steel, high-strength plastics, etc.

[0021] Using this static box base, an in-situ monitoring method for methane emissions from rice plants according to the present invention includes the following steps:

[0022] (a) Select the rice to be tested, insert the connector into the soil around the rice, place the rice to be tested in the middle of the connector, and ensure that the connector does not affect the normal growth of the rice;

[0023] (b) Pass the rice through from the top through the holes in the isolation film. Place the isolation film at the lower part of the rice stem, unfold the isolation film, lay the isolation film on the top of the connector, wrap the isolation film around the rice plant in a circle, and use an elastic rope to tie the isolation film to the rice plant tightly to ensure that the isolation film fits tightly against the root of the rice stem to the greatest extent;

[0024] (c) Align the positioning holes of the connector with those of the socket, insert the positioning pin, fasten the buckle, place the static chamber in the water seal groove, add water for sealing, and start monitoring;

[0025] (d) After the monitoring is completed, remove the static chamber, the connector, and the isolation film, and leave the socket in the soil;

[0026] (e) When measuring next time, just repeat steps (b) to (d). The measurement frequency depends on the actual monitoring needs.

[0027] The entire installation and monitoring process is fast and simple. A single socket can be reused at a fixed position. The disturbance to the soil around the rice plant during the monitoring process is small and does not affect the growth of the rice.

Claims

1. A static chamber base for in-situ monitoring of methane emissions from rice plants, characterized in that, From bottom to top, there are successively a plug-in member (1) inserted into the soil around the rice, an isolation film (2) covering the top of the plug-in member for isolating soil and discharging gas, and a connecting member (3) with its lower end docked to the plug-in member and its upper end docked to the static chamber. The isolation film (2) is provided with holes through which the rice plants can pass. The docking mode of the connecting member and the plug-in member is detachable.

2. The static chamber base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, The bottom of the connecting member (3) is provided with a fixing ring (31) for docking with the plug-in member and a snap fastener (32) provided on the fixing ring.

3. The static box base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, The top of the connecting member (3) is provided with a water seal groove (33) for placing the static chamber and ensuring the airtightness of the docking part.

4. The static box base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, The plug-in member (1) is provided with a snap fastener joint (11) for cooperating with the snap fastener.

5. A static chamber base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, Positioning holes are provided on the periphery of the plug-in member (1) and the periphery of the connecting member (2).

6. The static chamber base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, The isolation film (2) is a flexible plastic film.

7. A static chamber base for in-situ monitoring of methane emissions from rice plants according to claim 1, characterized in that, The aperture of the holes on the isolation film can be adjusted according to the stem diameter of the rice plants in different growth periods.

8. A monitoring method for methane emissions from rice plants in situ using the static box base described in claim 1, characterized in that, It includes the following steps: (a) Select the rice plants to be measured, insert the plug-in member into the surrounding soil, and place the rice plants to be measured in the middle of the plug-in member; (b) The rice plants to be measured pass through the holes on the isolation film, and the isolation film is laid on the top of the plug-in member, so that the isolation film fits the stem of the rice plants until no gas exchange can occur between the lower part and the upper part of the isolation film; (c) Install the connecting member, fasten the snap fastener, place the static chamber in the water seal groove, add water for sealing, and start gas sampling and monitoring; (d) After the gas sampling and monitoring are completed, remove the static chamber, the connecting member, and the isolation film, and leave the plug-in member in the soil; (e) When measuring next time, repeat steps (b) to (d).

9. A method for in-situ monitoring of methane emissions from rice plants according to claim 8, characterized in that, In step (b), the isolation film can be wound around the rice plants in a circle, and the isolation film and the rice plants can be tied tightly with a rope.

10. A method for in-situ monitoring of methane emissions from rice plants according to claim 9, characterized in that, The rope is made of an elastic material.

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