An outdoor light intensity control experimental device and its application

Abstract

The present invention discloses a field light intensity control experimental device and its application. The device includes a culture chamber with adjustable light intensity, which includes two nested cylindrical lower-open chambers, a sampling tube, and a motor. The two cylindrical lower-open chambers are arranged with alternating transparent and opaque parts of the same shape and size. The sampling tube penetrates through the inner and outer cylindrical lower-open chambers, and the length of the lower end part is adjustable. The motor is arranged at the center of the top of the outer cylindrical lower-open chamber and can rotate the outer cylindrical lower-open chamber relative to the inner cylindrical lower-open chamber. A light intensity sensor is arranged in the inner cylindrical lower-open chamber, and a floating body and a still water ring can also be additionally connected according to needs. The present invention explores the influence of light intensity on the greenhouse gas emissions of the underlying surface by changing its own light transmission intensity. The overall structure is simple, the applicable range is wide, and the use cost is low. It is suitable for on-site light intensity control experiments in various sites such as flowing water bodies, static water bodies, and wetland soils.

Description

Technical Field

[0001] The present invention relates to an experimental device for light intensity control and its application, in particular to an experimental device for field light intensity control and its application, belonging to the technical field of experimental devices. Background Art

[0002] Light intensity is one of the important influencing factors in biogeochemical processes. It directly affects the photosynthesis of plants, thereby affecting the consumption of CO2. Research shows that soluble organic matter and DMS in surface water can also produce CH4 under light conditions. Therefore, it is very necessary to explore and quantify the differences in various biogeochemical processes under different light conditions.

[0003] Currently, in the experimental operations of cultivation experiments with light as a variable, mainly environmental simulation is carried out in an indoor incubator or simple shading of the test substances is carried out at a field site. The former is difficult to create experimental conditions completely consistent with the field environment, and thus it is difficult to obtain accurate results of the actual situation. The latter is difficult to accurately control the light intensity conditions of the test substances. Therefore, it is necessary to develop an experimental device for light intensity control applicable to the field. Summary of the Invention

[0004] Object of the Invention: To solve the problems existing in the prior art, the first object of the present invention is to provide an experimental device for field light intensity control; the second object of the present invention is to provide an application for exploring the influence of light intensity on greenhouse gas emissions in the field using this device.

[0005] Technical Solution: An experimental device for field light intensity control according to the present invention includes a culture chamber with adjustable light intensity. The culture chamber includes two layers of columnar lower open chambers nested inside and outside, a sampling tube, and a motor. The two layers of columnar lower open chambers are arranged with alternating transparent and opaque parts having the same shape and size. The sampling tube penetrates through the inner and outer layers of columnar lower open chambers, and the length of the part penetrating through the inner layer of columnar lower open chamber is adjustable. The motor is arranged at the center of the top of the outer layer of columnar lower open chamber and can rotate the outer layer of columnar lower open chamber relative to the inner layer of columnar lower open chamber. A light intensity sensor is arranged inside the inner layer of columnar lower open chamber, which can feedback the light intensity in the culture chamber to the motor to adjust the light intensity in the culture chamber.

[0006] Further, a first bevel gear is arranged at the front end of the motor. There is an opening above the center of the top of the outer lower open chamber, and a second bevel gear is arranged at the center of the top of the inner layer of columnar lower open chamber. There is a through hole in the middle of the second bevel gear, and the sampling tube penetrates through the through hole and the opening. The diameter of the through hole is equal to the outer diameter of the sampling tube, and the diameter of the opening is equal to the diameter of the second bevel gear. The first bevel gear meshes with the second bevel gear, enabling the outer layer of columnar lower open chamber to rotate around the central axis of the inner layer of columnar lower open chamber.

[0007] Further, the lower end of the sampling tube penetrates through the inner-layer columnar lower open cavity chamber, and the upper end is connected with a three-way valve to ensure the enclosure of the experimental environment during the test.

[0008] Further, the light intensity sensor is installed on the inner wall of the inner-layer columnar lower open cavity chamber.

[0009] Further, the number of the light intensity sensors is more than 2, and they are evenly distributed.

[0010] Further, it further includes a floating body. An opening is provided at the center of the floating body, and the upper side of the opening is detachably and sealingly connected to the lower part of the inner-layer columnar lower open cavity chamber.

[0011] Further, it further includes a still water ring, and the still water ring is detachably and sealingly connected to the lower part of the opening of the floating body.

[0012] Further, the floating body is a ring-shaped foam or a ring-shaped plastic. It mainly provides buoyancy for the whole device on the water surface. Its inner diameter is exactly equal to the outer diameter of the inner-layer columnar lower open cavity chamber. When the culture chamber with adjustable light intensity is connected to the floating body as a whole, a sealed cavity can be formed between the experimental device and the water surface.

[0013] Further, the still water ring is a soft hollow columnar structure, and a plurality of through holes are provided on the side wall at the lower end of the still water ring.

[0014] Further, the material of the still water ring is rubber or plastic, etc.

[0015] The application of the field light intensity control experimental device described in the present invention in exploring the influence of light intensity on greenhouse gas emissions in the field. By repeatedly extracting gas samples from the culture chamber, the difference in the content of gas samples within a certain period of time is obtained, and the greenhouse gas emission / absorption situation of the test substance during the experiment can be obtained by combining with the ideal gas state equation.

[0016] The field light intensity control experimental device described in the present invention can collect the pore water of the underlying surface soil for other applications. By adjusting the length of the sampling tube in the culture chamber and installing a filter with a pore size of 0.45 μm, the present invention can collect the pore water of the soil in the test substance, and other applications such as the biogenic substance conversion of the test substance during the experiment can be obtained by combining with the subsequent physicochemical analysis of the pore water of the soil.

[0017] The present invention realizes the precise control of the light intensity condition of the culture environment through the design of multiple chambers and the adjustment of the light intensity control of the culture chamber based on the data feedback of multiple light intensity sensors. The experimental device has a simple structure and multiple combination methods, thus meeting the requirements that the device can be applied to various complex field experimental scenarios.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages:

[0019] (1) The present invention can achieve accurate control of the light intensity inside the chamber through the nested design of two-layer columnar downward-opening chambers and the structural design of conical teeth.

[0020] (2) The present invention makes the device applicable to the experiment on the impact of light intensity in static water bodies on greenhouse gas emissions through the detachable assembly design of the floating body.

[0021] (3) Through the structural design of the still water ring, the present invention improves the stability of the device in flowing water without affecting its function, making the device applicable to the experiment on the impact of light intensity in flowing water bodies on greenhouse gas emissions.

[0022] (4) The present invention can explore the impact of light intensity on the greenhouse gas emissions of the underlying surface by changing its own light transmittance. The overall structure is simple, the applicable range is wide, and the use cost is low. It is applicable to the experiments on the impact of light intensity on greenhouse gas emissions in various sites such as flowing water bodies, static water bodies, and wetland soils. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the field light intensity control experimental device of the present invention when used for soil;

[0024] Figure 2 is a schematic structural diagram of the field light intensity control experimental device of the present invention when used for static water bodies

[0025] Figure 3 is a schematic structural diagram of the field light intensity control experimental device of the present invention when used for flowing water bodies;

[0026] Figure 4 is an exploded schematic diagram of the field light intensity control experimental device of the present invention;

[0027] Figure 5 is a schematic diagram of the structural details of the light intensity adjustment part of the present invention. Detailed Embodiments

[0028] The technical solutions of the present invention will be further described below with reference to the drawings.

[0029] Example 1

[0030] As Figure 1 、 5As shown in the figure, a field light intensity control experimental device of the present invention includes a culture chamber with adjustable light intensity, a floating body 3, and a still water ring 4. Among them, the culture chamber with adjustable light intensity includes an outer cylindrical lower-opening chamber 1, an inner cylindrical lower-opening chamber 2, a sampling tube 5, and a motor 6. The outer cylindrical lower-opening chamber 1 is nested outside the inner cylindrical lower-opening chamber 2. The surfaces of the outer cylindrical lower-opening chamber 1 and the inner cylindrical lower-opening chamber 2 are arranged with alternating transparent and opaque parts of the same shape and size. When the opaque part of the outer cylindrical lower-opening chamber 1 covers the transparent part of the inner cylindrical lower-opening chamber 2, the device reaches the darkest light condition, that is, the opaque state; when the opaque parts of the outer cylindrical lower-opening chamber 1 and the inner cylindrical lower-opening chamber 2 completely overlap, the device reaches the maximum light condition. There is an opening above the center of the top of the outer cylindrical lower-opening chamber 1. The motor 6 is fixed at the edge of the opening above the outer cylindrical lower-opening chamber 1. A first bevel gear 9 is provided at the front end of the motor 6, and the first bevel gear 9 is exactly in the central opening above the outer cylindrical lower-opening chamber 1. A second bevel gear 10 is fixedly provided at the center of the top of the inner cylindrical lower-opening chamber 2. The diameter of the central opening above the outer cylindrical lower-opening chamber 1 is slightly larger than the diameter of the second bevel gear 10. There is a through hole in the middle of the second bevel gear 10. The sampling tube 5 passes through the through hole and the central opening above the outer cylindrical lower-opening chamber 1. The diameter of the through hole is equal to the outer diameter of the sampling tube 5. The first bevel gear 9 meshes with the second bevel gear 10, so that the outer cylindrical lower-opening chamber 1 can rotate around the central axis of the inner cylindrical lower-opening chamber 2. Two light intensity sensors 8 are provided on the inner side wall of the inner cylindrical lower-opening chamber 2, which can feedback the light intensity in the culture chamber to the motor 6 to adjust the light intensity in the culture chamber. The lower end of the sampling tube 5 passing through the inner cylindrical lower-opening chamber 2 is adjustable. A three-way valve 7 is connected to the upper end of the sampling tube 5. If it is necessary to take water samples in the soil, a 0.45μm filter can be installed at the end of the sampling tube 5 extending into the inner cylindrical lower-opening chamber 2.

[0031] As Figure 2 shown, in another embodiment of the present invention, it further includes a floating body 3. There is an opening in the center of the floating body 3, and the upper side of the opening is detachably and sealingly connected to the lower part of the inner cylindrical lower-opening chamber 2. The floating body 3 is a ring-shaped foam or ring-shaped plastic. The floating body 3 mainly provides buoyancy for the whole device on the water surface. Its inner diameter is exactly equal to the outer diameter of the inner cylindrical lower-opening chamber 2, so that when the culture chamber with adjustable light intensity is connected to the floating body 3 as a whole, a sealed cavity is formed between the whole device and the water surface.

[0032] As Figure 3-4 shown, in another embodiment of the present invention, it further includes a still water ring 4. The still water ring 4 is detachably and sealingly connected to the lower part of the opening of the floating body 3. The still water ring 4 is a soft hollow cylindrical structure, and several through holes are provided on the side wall of the lower end of the still water ring 4. The material of the still water ring 4 is rubber or plastic and other materials.

[0033] During the experiment:

[0034] Before the experiment, first confirm the experimental research object. If the experimental research object is wetland soil, there is no need to connect the floating body 3 and the still water ring 4; if the experimental research object is a static water body, first install the culture chamber with adjustable light intensity above the floating body 3 and seal the interface; if the experimental research object is a flowing water body, after installing the culture chamber with adjustable light intensity above the floating body 3 and sealing the interface, then connect the still water ring 4 below the floating body 3 and seal the interface.

[0035] Adjust the length of the sampling tube extending into the inner cylindrical lower open chamber 2. If gas samples need to be taken, the extension length is zero, that is, the opening of the sampling tube 5 is flush with the inner wall of the inner cylindrical lower open chamber 2. If water samples need to be taken, ensure that one end of the sampling tube 5 extending into the inner cylindrical lower open chamber 2 is below the water surface. If soil water samples need to be taken, install a 0.45μm filter at one end of the sampling tube 5 extending into the inner cylindrical lower open chamber 2 and place it at the corresponding wetland soil depth.

[0036] After adjusting the three-way valve 7 to connect the inner cylindrical lower open chamber 2 to the outside through the sampling tube 5, fix the experimental device at the representative point of the test site, adjust the motor 6 according to the experimental set light intensity and the value of the light intensity sensor 8 to make the experimental set light intensity and the value of the light intensity sensor 8 match, and close the three-way valve 7 to start the experiment.

Claims

1. An experimental device for controlling light intensity in the wild, characterized in that, It includes a culture chamber with adjustable light intensity. The culture chamber includes two nested cylindrical lower-open chambers (1, 2), a floating body (3), a still water ring (4), a sampling tube (5) and a motor (6). The two cylindrical lower-open chambers (1, 2) are arranged with alternating transparent and opaque parts in the same shape and size. The sampling tube (5) penetrates through the inner and outer cylindrical lower-open chambers (1, 2), and the length of the part penetrating through the inner cylindrical lower-open chamber (2) is adjustable. The motor (6) is arranged at the center of the top of the outer cylindrical lower-open chamber (1) and can rotate the outer cylindrical lower-open chamber (1) relative to the inner cylindrical lower-open chamber (2). A light intensity sensor (8) is arranged inside the inner cylindrical lower-open chamber (2) and can feedback the light intensity in the culture chamber to the motor (6) to adjust the light intensity in the culture chamber. An opening is provided at the center of the floating body (3), and the upper side of the opening is detachably and sealingly connected to the lower part of the inner cylindrical lower-open chamber (2). The still water ring (4) is detachably and sealingly connected to the lower part of the opening of the floating body (3). A first bevel gear (9) is provided at the front end of the motor (6). An opening is provided above the center of the top of the outer cylindrical lower-open chamber (1), and a second bevel gear (10) is provided at the center of the top of the inner cylindrical lower-open chamber (2). A through hole is provided in the middle of the second bevel gear (10). The sampling tube (5) penetrates through the through hole and the opening. The diameter of the through hole is equal to the outer diameter of the sampling tube (5), and the diameter of the opening is equal to the diameter of the second bevel gear (10). The first bevel gear (9) meshes with the second bevel gear (10) so that the outer cylindrical lower-open chamber (1) can rotate around the central axis of the inner cylindrical lower-open chamber (2).

2. The field light intensity control experimental device according to claim 1, characterized in that, The lower end of the sampling tube (5) penetrates through the inner cylindrical lower-open chamber (2), and a three-way valve (7) is connected to the upper end.

3. The field light intensity control experiment device according to claim 1, characterized in that, The light intensity sensor (8) is installed on the inner wall of the inner cylindrical lower-open chamber (2).

4. The field light intensity control experimental device according to claim 3, characterized in that, The number of the light intensity sensors (8) is more than 2.

5. The field light intensity control experimental device according to claim 1, characterized in that The floating body (3) is a ring-shaped foam or a ring-shaped plastic.

6. The field light intensity control experimental device according to claim 1, characterized in that The still water ring (4) is a soft hollow cylindrical structure. A number of through holes are provided on the side wall of the lower end of the still water ring (4). The material of the still water ring (4) is rubber or plastic.

7. Application of the field light intensity control experimental device according to any one of claims 1-6 in exploring the influence of light intensity on greenhouse gas emissions in the field.

Images