An experimental device for in-situ detection of vertical migration of phytoplankton

Abstract

The utility model relates to phytoplankton migration detection technical field discloses an experimental device for phytoplankton vertical migration in situ detection, including cylinder, first filter screen and sampling pipe, first filter screen swing joint is in the middle part of cylinder, to divide the cylinder into upper chamber and lower chamber, sampling pipe passes through the first avoidance hole on first filter screen and extends into the lower chamber, and the top end of sampling pipe is higher than upper chamber, make experimental device be located under natural water body environment also can limit the up and down migration of phytoplankton, thereby solve the problem that experimental device in the prior art can not simulate natural water body environment while artificially controlling dinoflagellate free migration.

Description

Technical Field

[0001] This utility model relates to the field of phytoplankton migration detection technology, and in particular to an experimental device for in-situ detection of vertical migration of phytoplankton. Background Technology

[0002] With the increasing eutrophication of water bodies and the impact of climate change, the frequency and severity of dinoflagellate blooms are on the rise. Unlike cyanobacteria, which rely on bubbles to passively regulate buoyancy, dinoflagellates can actively achieve rapid vertical migration through flagellar movement (daily migration depth can reach several meters to tens of meters), thus enabling them to dynamically respond to changes in the vertical gradient of light, temperature, and nutrients. Therefore, the ecological competitive advantage of dinoflagellates is closely related to their unique vertical migration ability.

[0003] In stratified water bodies, dinoflagellates rise to the surface during the day for photosynthesis and sink to deeper layers rich in nitrates and phosphates at night to absorb nutrients, forming a "diurnal migration-resource capture" strategy. This efficient migration behavior makes them significantly superior to cyanobacteria in terms of nutrient competition, light-avoidance damage, and predation avoidance. Especially in water bodies with stable thermoclines and significant vertical nutrient gradients, dinoflagellates can gradually replace cyanobacteria as the dominant species, triggering algal community succession. Studies have shown that dinoflagellate blooms are often accompanied by the decline of cyanobacterial blooms, and their migration ability is a key mechanism driving this process.

[0004] The main dinoflagellates in freshwater are *Ceratophyllum demersum*, which is difficult to culture in the laboratory, thus severely limiting the assessment of their vertical migration ability and its role in algal bloom succession.

[0005] In summary, existing experimental devices cannot artificially control the free migration of dinoflagellates while simulating natural aquatic environments. Utility Model Content

[0006] The purpose of this invention is to provide an experimental device for in-situ detection of vertical migration of phytoplankton, which solves the problem in the prior art that experimental devices cannot artificially control the free migration of dinoflagellates while simulating the natural aquatic environment.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: In the first aspect, this utility model provides an experimental device for in-situ detection of vertical migration of phytoplankton, including a cylinder, a first filter screen and a sampling tube; The first filter screen is movably connected to the middle of the cylinder to divide the cylinder into an upper chamber and a lower chamber. The sampling tube extends into the lower chamber through a first clearance hole on the first filter screen, and the top of the sampling tube is higher than the upper chamber.

[0008] As an optional solution, a plate body is also included; The plate is installed between the upper chamber and the lower chamber. The plate is provided with through holes penetrating its upper and lower end faces and mounting grooves penetrating one side wall. The through holes and the mounting grooves are connected. The first filter screen is slidably connected within the mounting groove, and the sliding direction of the first filter screen is perpendicular to the axis of the cylinder.

[0009] As an optional solution, a buoyancy connector is also included; The buoyancy connector is connected to the upper chamber, and the buoyancy connector has a second clearance hole for the sampling tube to pass through.

[0010] As an optional solution, the buoyancy connector is provided with a pressure strip for pressing the upper chamber.

[0011] As an optional solution, a number of second filters are also provided on the side wall of the cylinder, and the number of second filters are respectively located in the upper chamber and the lower chamber.

[0012] As an optional solution, several second filters are arranged in layers; Each filter layer includes two second filters positioned opposite each other, and the second filters of adjacent layers intersect perpendicularly along their vertical projections.

[0013] As an optional solution, a fixing rope is also included; One end of the fixing rope is connected to the lower chamber, and the other end of the fixing rope is connected to the anchor point of the detection position.

[0014] This utility model has the following unexpected beneficial effects: 1. This utility model is provided with a cylindrical body, a first filter screen and a sampling tube. The first filter screen movably divides the cylindrical body into an upper chamber and a lower chamber, and the first filter screen is provided with a first clearance hole for the sampling tube to pass through. This allows the experimental device to restrict the vertical migration of phytoplankton even when it is in a natural water environment, thereby solving the problem in the prior art that the experimental device cannot artificially control the free migration of dinoflagellates while simulating a natural water environment.

[0015] 2. The first filter screen of this utility model is designed to be movable. Pulling the first filter screen open before the experiment can ensure that the upper water contains the required algae species. Closing the first filter screen after the experiment starts can prevent the corresponding algae species from migrating downwards, thereby ensuring the accuracy of the experimental results. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the experimental apparatus according to an embodiment of the present invention; Figure 2 This is an exploded view of the components of the experimental apparatus according to an embodiment of this utility model; In the figure, 1 is the cylinder; 101 is the upper chamber; 102 is the lower chamber; 2 is the first filter screen; 201 is the first clearance hole; 3 is the sampling tube; 4 is the plate; 5 is the buoyancy connector; 6 is the second filter screen; and 7 is the fixing rope. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] In one embodiment, such as Figures 1 to 2 As shown, in a first aspect, this utility model provides an experimental device for in-situ detection of vertical migration of phytoplankton, including a cylinder 1, a first filter 2, and a sampling tube 3.

[0021] The first filter screen 2 is movably connected to the middle of the cylinder 1 to divide the cylinder 1 into an upper chamber 101 and a lower chamber 102. The sampling tube 3 extends into the lower chamber 102 through the first clearance hole 201 on the first filter screen 2. The top of the sampling tube 3 is higher than the upper chamber 101. When the on-site experimental personnel need to collect water samples from the lower chamber 102, they can directly use the sampling tube 3 to take samples. When the on-site experimental personnel need to collect water samples from the upper chamber 101, since the upper chamber 101 is close to the water surface, the experimental personnel can directly use a suitable method to take samples.

[0022] The bottom of the cylinder 1 is open, which allows algae between the rocks to enter when the cylinder 1 is inserted into the riverbed rocks.

[0023] The cylinder 1 is made of a 0.39mm thick soft crystal PVC material. This material has good light transmittance, low density, light weight and low price, which can meet the requirements of this experimental device for the cylinder 1.

[0024] The sampling tube 3 is a common experimental sampling device, and this utility model does not make any further improvements to the corresponding structure. Therefore, the structure and material of the sampling tube 3 are not further limited here.

[0025] Based on this, the experimental device includes a cylinder 1, a first filter screen 2, and a sampling tube 3. The cylinder 1 is movably divided into an upper chamber 101 and a lower chamber 102 by the first filter screen 2, and the first filter screen 2 is provided with a first clearance hole 201 for the sampling tube 3 to pass through. This allows the cylinder 1 to be placed directly in a natural water body while also restricting the vertical migration of phytoplankton through the filter screen, thereby solving the problem in the prior art that experimental devices cannot artificially control the free migration of dinoflagellates while simulating a natural water environment.

[0026] Furthermore, such as Figures 1 to 2 As shown, it also includes plate 4.

[0027] The plate 4 is installed between the upper chamber 101 and the lower chamber 102. The plate 4 is provided with through holes penetrating its upper and lower end faces and mounting grooves penetrating one side wall of its side, and the through holes and the mounting grooves are connected.

[0028] The plate 4 is a rigid plastic made of PVC or ABS material. The mounting and rotating methods of the plate 4 with the upper chamber 101 and the lower chamber 102 are not further limited here. The plate 4 can be used to clamp the upper chamber 101 and the lower chamber 102, or a plug-in structure can be added to the ends of the upper chamber 101 and the lower chamber 102 to allow the upper chamber 101 and the lower chamber 102 to be connected to the plate 4 by plugging.

[0029] The first filter screen 2 is slidably connected to the mounting groove, and the sliding direction of the first filter screen 2 is perpendicular to the axis of the cylinder. The sliding power of the first filter screen 2 is provided by the on-site experimental personnel. The first filter screen 2 avoids completely sliding into the space formed by the connection between the through hole and the mounting groove by increasing the length of the filter screen. When the first filter screen 2 slides into the extreme position of the mounting groove, the sampling tube 3 is inserted into the first clearance hole 201, so that the upper chamber 101 and the lower chamber 102 are sealed, thereby enabling the plate body 4 to restrict the vertical movement of plankton.

[0030] Furthermore, such as Figures 1 to 2 As shown, it also includes a buoyancy connector 5.

[0031] The buoyancy connector 5 is connected to the upper chamber 101, and the buoyancy connector 5 has a second clearance hole for the sampling tube 3 to pass through.

[0032] The buoyancy connector 5 is provided with a pressure bar for pressing the upper chamber 101.

[0033] The buoyancy connector 5 is made of polypropylene, and the buoyancy generated by the buoyancy connector 5 is greater than the weight of the entire device to prevent it from sinking.

[0034] Furthermore, such as Figures 1 to 2 As shown, a number of second filters 6 are also provided on the side wall of the cylinder 1, and the number of second filters 6 are respectively located in the upper chamber 101 and the lower chamber 102.

[0035] Since the cost of the filter cage is much greater than the cost of the cylinder 1 using the crystal plate, the structure used in this utility model allows the second filter 6 to connect both the upper chamber 101 and the lower chamber 102 with the water flow, which greatly reduces the investment in equipment while simulating the natural water environment; when facing large-scale experiments that require large-scale experimental equipment deployment, it can reduce the investment in equipment.

[0036] Furthermore, such as Figures 1 to 2 As shown, several layers of the second filter screen 6 are arranged.

[0037] Each filter layer includes two second filters 6 positioned opposite each other, and the projections of the second filters 6 of adjacent layers are perpendicularly intersecting. This perpendicular intersection allows the cylinder 1 to receive water flow from four directions. Through the structural design of the cylinder 1, the filter area of ​​the cylinder 1 is reduced while ensuring water exchange efficiency, thereby reducing the cost of the experimental device.

[0038] Furthermore, such as Figures 1 to 2 As shown, it also includes a fixing rope 7.

[0039] One end of the fixing rope 7 is connected to the lower chamber 102, and the other end of the fixing rope 7 is connected to the anchor point of the detection position; the anchor point of the detection position can be a stone at the bottom of the water body, and the tensile strength of the fixing rope 7 can ensure that the fixing rope 7 will not break under the action of the water flow force.

[0040] In summary, the experimental device cylinder 1 encloses a portion of the water body, and the first filter screen 2 with a first clearance hole 201 is used to movably divide the cylinder 1 into an upper chamber 101 and a lower chamber 102. This allows the experimental device to restrict the vertical migration of phytoplankton even in a natural water environment, thus solving the problem in the prior art where experimental devices cannot artificially control the free migration of dinoflagellates while simulating a natural water environment.

[0041] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An experimental apparatus for in-situ detection of vertical migration of phytoplankton, characterized in that, It includes a cylinder (1), a first filter screen (2), and a sampling tube (3); The first filter screen (2) is movably connected to the middle of the cylinder (1) to divide the cylinder (1) into an upper chamber (101) and a lower chamber (102). The sampling tube (3) passes through the first clearance hole (201) on the first filter screen (2) and extends into the lower chamber (102). The top of the sampling tube (3) is higher than the upper chamber (101).

2. The experimental apparatus according to claim 1, characterized in that, It also includes the plate (4); The plate (4) is installed between the upper chamber (101) and the lower chamber (102). The plate (4) is provided with through holes penetrating its upper and lower end faces and mounting grooves penetrating one side wall, and the through holes and the mounting grooves are connected. The first filter screen (2) is slidably connected in the mounting groove, and the sliding direction of the first filter screen (2) is perpendicular to the axis of the cylinder (1).

3. The experimental apparatus according to claim 1, characterized in that, It also includes the buoyancy connector (5); The buoyancy connector (5) is connected to the upper chamber (101), and the buoyancy connector (5) has a second clearance hole for the sampling tube (3) to pass through.

4. The experimental apparatus according to claim 3, characterized in that, The buoyancy connector (5) is provided with a pressure strip for pressing the upper chamber (101).

5. The experimental apparatus according to claim 3, characterized in that, The side wall of the cylinder (1) is also provided with a number of second filters (6), and the number of second filters (6) are located in the upper chamber (101) and the lower chamber (102) respectively.

6. The experimental apparatus according to claim 5, characterized in that, Several second filters (6) are arranged in layers; Each filter layer includes two second filters (6) positioned opposite each other, and the second filters (6) of adjacent layers intersect vertically along their vertical projections.

7. The experimental apparatus according to claim 1, characterized in that, It also includes a fixing rope (7); One end of the fixing rope (7) is connected to the lower chamber (102), and the other end of the fixing rope (7) is connected to the anchor point of the detection position.

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