Method for restoring submerged plants in multi-pond wetlands

Abstract

To provide a method for restoring submerged plants in multi-pond wetlands.SOLUTION: The method of the present invention includes: step S1 of uniformly pouring a substrate improvement material into a pond to restore an ecological environment of bottom mud so that a thickness of the substrate improvement material coating is 5 to 10 cm; step S2 of slowing a flow speed of a water flow when adding water to the pond to increase the settling of water particles in order to increase the transparency of a water body, and in an early stage of cultivation, lowering the water level of the pond by a water level adjustment device so as to irradiate a water bottom with light; step S3 of aerating a mud-water interface using an aeration device in order to increase the dissolved oxygen in the water body; step S4 of planting a submerged plant and laying the substrate improvement material for 2d to 3d, and then cultivating a pollution-resistant emergent plant and the submerged plant in a covered area of the substrate improvement material. The present invention promotes the recovery of submerged plants, and further accelerates the recovery and developmental health of eutrophic lake and river ecosystems.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of the restoration of submerged plants, and particularly to a method for restoring submerged plants in multi-pond wetlands.

Background Art

[0002] Inland freshwater fisheries in China mainly cultivate premium varieties such as largemouth bass, crucian carp, yellow catfish, loach, and eel. The form of cultivation is mainly individual zone-style traditional cultivation, and there are also problems such as relatively extensive cultivation mode and too high cultivation density. As a result, a large amount of feed and excrement of aquatic animals remain, causing nitrogen and phosphorus pollution of the aquaculture water body due to reasons such as the destruction of the balance of some aquatic plants, and thus causing serious environmental problems such as eutrophication of the surrounding water body. The restoration and reconstruction of the aquatic ecosystem is one of the main contents of the restoration of eutrophic water body ecosystems.

[0003] The ultimate goal of the restoration of eutrophic water body ecosystems is to construct a good ecosystem. To construct a good ecosystem, it is first necessary to quickly restore the submerged plant community. Most relevant scholars and experts believe that submerged plants play a very important role in the restoration of water body ecosystems. Submerged plants can not only adsorb eutrophic components such as nitrogen and phosphorus during their growth process and promote the sedimentation of suspended substances in water, but also increase the dissolved oxygen in water through photosynthesis, purify water quality, increase the number of microorganisms in water, and reduce the degree of eutrophication of the water body. Submerged plants provide a healthier habitat and hiding place for aquatic animals and further improve the entire aquatic ecosystem. Therefore, in water bodies with severe eutrophication, the cultivation of submerged plants is one of the most important means for the restoration and reconstruction of its aquatic ecosystem.

[0004] However, in the process of implementing the related technical solutions, it was found that there are at least the following technical problems. The growth and distribution of submerged plants are controlled and threatened by many environmental factors such as light irradiation, water transparency, hard ground, nutrient salts, and wind waves. Among these many environmental factors, it has been discovered that the transparency of the water body and light irradiation are the most significant environmental stresses on submerged plants. The sediment environment of the water body with severe pollution is not suitable for the growth of aquatic plants. Submerged plants are often in a severe oxygen-deficient state. Moreover, the transparency of the water body decreases, and submerged plants cannot obtain sufficient light irradiation, cannot perform normal photosynthesis and respiration, and gradually die, and ultimately cannot settle the submerged plant community in the water.

Summary of the Invention

Means for Solving the Problems

[0005] This application provides a method for restoring submerged plants in a multi-pond wetland, thereby solving the problem in the prior art that the sediment environment of the water body with severe pollution is not suitable for the growth of aquatic plants. Submerged plants are often in a severe oxygen-deficient state. Moreover, the transparency of the water body decreases, and submerged plants cannot obtain sufficient light irradiation, cannot perform normal photosynthesis and respiration, and gradually die, and ultimately cannot settle the submerged plant community in the water. Through reasonable arrangement, while improving the habitat of black and odorous sediment, the main environmental factors affecting the growth of submerged plants are improved, the recovery of submerged plants is promoted, and the recovery and healthy development of eutrophic lakes and river ecosystems are accelerated.

[0006] The present invention provides a method for restoring submerged plants in a multi-pond wetland, In order to repair the ecological environment of the sediment, step S1 of uniformly injecting a subgrade improvement material into the pond, and the thickness of the subgrade improvement material coating is 5 - 10 cm, and In order to enhance the transparency of the water body, when adding water to the pond, slow down the flow rate of the water flow to increase the sedimentation of water particles. At the initial stage of cultivation, lower the water level of the pond by a water level adjustment device to irradiate light to the bottom of the water. Step S2, and In order to increase the dissolved oxygen in the water body, step S3 of aerating the mud-water interface using an aeration device, and After planting submerged plants and laying the subgrade improvement material for 2 to 3 days, step S4 of cultivating pollution-resistant emergent plants and submerged plants in the subgrade improvement material covering area of the water body is included.

[0007] Furthermore, the subgrade improvement material is made of raw materials with the following mass fractions. Modified biochar 60 - 70% Zeolite 10 - 20% Adhesive 20 - 30%

[0008] Furthermore, the pollution-resistant emergent plants are one or more combinations of arrowhead, cutleaf arrowhead, and rice grass.

[0009] Furthermore, the pollution-resistant submerged plants are one or more combinations of twisted pondweed, black pondweed, fusiform pondweed, and slender pondweed.

[0010] Furthermore, the water level adjustment device includes a support plate, a reel, a pulling rope, a counterweight ring, a corrugated pipe, a drain pipe, and a positioning and adjustment mechanism. The support plate is installed on the upper end surface of the pond. The reel is rotatably mounted on the upper end surface of the support plate. One end of the pulling rope is fixed to the circumferential surface of the reel. The other end of the pulling rope penetrates the support plate and is connected to the counterweight ring. The counterweight ring is fixed to the upper end surface of the corrugated pipe. One end of the drain pipe is communicated with the lower end of the corrugated pipe. The other end of the drain pipe penetrates the pond and extends to the outside of the pond. The positioning and adjustment mechanism includes a measuring rod and a pointer. The lower end of the measuring rod penetrates the support plate and is fixed to the counterweight ring. The measuring rod is slidably fitted to the support plate. The pointer is fixed to the upper end of the support plate. One end of the pointer is attached to the circumferential surface of the measuring rod.

[0011] Furthermore, a through hole is opened in the support plate. A plurality of ball grooves are opened in the hole wall of the through hole. Balls are rotatably connected in the ball grooves. The measuring rod penetrates the through hole, and the balls are rollingly fitted to the circumferential surface of the measuring rod.

[0012] Furthermore, a screw hole is formed in the upper end surface of the counterweight ring, and a male screw that fits with the screw hole is arranged on the peripheral surface of the measuring rod and near the lower end thereof.

[0013] Furthermore, two fixing blocks are arranged on the support plate at intervals, and both ends of the reel are respectively inserted into the two fixing blocks and are rotationally fitted to the fixing blocks. A bolt is screwed onto the fixing block, and the bolt passes through the fixing block and is slidably fitted to the peripheral surface of the reel.

[0014] Furthermore, the aeration device includes a nano-fine bubble aeration pipe, a Roots-type frequency conversion blower, an oxidation-reduction potential automatic monitoring device, and a programmable logic controller. The fine bubble aeration pipe is arranged at the bottom of the pond, the Roots-type frequency conversion blower is arranged outside the pond, and the Roots-type frequency conversion blower and the fine bubble aeration pipe are connected via a rubber tube. The oxidation-reduction potential automatic monitoring device is arranged between the upper layer of water and the surface layer of the bottom mud, and the oxidation-reduction potential automatic monitoring device is electrically connected to the Roots-type frequency conversion blower via a programmable logic controller.

[0015] Furthermore, silver-supported zeolite is arranged on the fine bubble aeration pipe.

Advantages of the Invention

[0016] The technical solution provided in this application has at least the following technical effects or advantages: Step 1: Implement steps such as restoring the habitat of the sediment, enhancing the transparency of the water body, increasing the dissolved oxygen in the water body, and colonizing submerged plants. Combine the covering of the subgrade improvement material with the colonization and restoration of plants to complement each other's deficiencies, effectively improve the sediment environment over the long term, restore the aquatic state, and solve the problem that the severely polluted water body sediment environment in the prior art is not suitable for the growth of aquatic plants. Submerged plants are often in a severe oxygen-deficient state, and moreover, the transparency of the water body decreases, and submerged plants cannot obtain sufficient light irradiation, cannot perform normal photosynthesis and respiration, and gradually die, ultimately unable to effectively solve the problem that the submerged plant community cannot be settled in the water. Through reasonable arrangement, while improving the habitat of the black and odorous sediment, the main environmental factors affecting the growth of submerged plants are improved, the recovery of submerged plants is promoted, and the recovery and sustainable health of eutrophic lakes and river ecosystems are accelerated. Step 2: By adopting a water level adjustment device, effectively solve the problem of low transparency of the water body in the prior art, and thus realize easy automatic adjustment of the water level and enhance the transparency of the water body.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0018] The embodiments of the present application disclose a method for restoring submerged plants in a multi-pond wetland. By steps such as restoring the habitat of the bottom mud, enhancing the transparency of the water body, increasing the dissolved oxygen in the water body, and colonizing submerged plants, through reasonable arrangement, while improving the habitat of the black and odorous bottom mud, the main environmental factors affecting the growth of submerged plants are improved, the restoration of submerged plants is promoted, and further the restoration and healthy development of eutrophic lakes and river ecosystems are accelerated.

[0019] To better understand the above technical solution, the above invention will be described in detail below in connection with the specification drawings and specific embodiments.

[0020] Referring to FIGS. 1-4, a method for restoring submerged plants in a multi-pond wetland is provided. Step S1: In order to restore the ecological environment of the bottom mud, a subgrade improvement material is uniformly put into the pond, and the thickness of the subgrade improvement material coating is 5-10 cm. All the raw materials of the subgrade improvement material used in the embodiments of the present application are environmentally friendly materials, without adding chemical reagents, and are inexpensive and easy to obtain.

[0021] The subgrade improvement material is made of raw materials with the following mass fractions. Modified biochar 60-70% Zeolite 10-20% Adhesive 20-30%

[0022] The manufacturing method of the subgrade improvement material includes the following steps. First, modified biochar, zeolite and adhesive are uniformly mixed in the above mass percentages, 20%-25% of the water of the mixture mass is added, and after the mixture paste is cured for 24 h, it is immersed in water for curing, and the duration is 3 days. The modified biochar is clay / biochar obtained by supporting clay on the surface of biochar. The binder is Portland cement. Second, the composite cured in (1) is crushed and sieved to obtain a subgrade improvement material with a particle size of 3-5 mm.

[0023] The manufacturing method of the modified biochar includes the following steps. a) Crush the moss pole into particles of 2 cm × 2 cm × 2 cm, wash it 2 - 3 times with deionized water, and then dry it at 60 °C for 5 h. b) Add the dried moss pole particles to the clay suspension and stir with a stirrer to obtain a moss pole - clay mixture. The stirring time was 2 hours. The mixture was dried at 80 °C for 24 hours. The clay is montmorillonite. The mass ratio of moss pole particles to clay is 5:1. c) Then place the dried mixture in an atmosphere furnace for carbonization. The carbonization temperature was 460 °C. Among them, a protective gas was passed through the atmosphere furnace, and the protective gas was nitrogen gas. The temperature was raised to 400 °C - 500 °C at a heating rate of 15 °C - 30 °C per minute, and the residence time was 2 hours to obtain clay - supported biochar. d) Grind the clay - supported biochar and sieve it to a particle size of 0.5 - 1 mm.

[0024] Clay contains many constant elements and trace elements beneficial to plant growth and can promote plant growth. Biochar is rich in organic substances and can provide a nutrient source for the initial growth of plants. Zeolite has a porous nature, can release air, improve the redox environment of the bottom water body and the surface sediment, and can provide favorable living conditions for plant growth. The subsoil improvement material can effectively inhibit the release of nitrogen, phosphorus nutrients and organic pollutants in the sediment, improve the sediment ecology, and provide a good ecological environment for benthic organisms.

[0025] Step S2: Increase the transparency of the water and slow down the water flow velocity. Slowing down the water flow velocity means that when adding water to the pond in the later stage, controlling the flow velocity to increase the sedimentation of water particles, thereby increasing the transparency of the water.

[0026] When controlling the water level, the light compensation depth can be regarded as a critical index for whether submerged plants can grow. Only when the actual water depth ≤ the light compensation depth can submerged plants germinate and grow normally, which is also the minimum boundary condition for the recovery of submerged plants in ecological engineering. The light compensation depth is directly related to the water transparency and the light intensity in the water. The relationship between the light irradiation intensity in the water and the water depth can be explained by Beer's law of the following formula.

[0027]

Number

[0028] In the formula, I h is the light irradiation intensity at the water depth h, I O is the light irradiation intensity on the water surface, and k is the vertical attenuation coefficient of light in the water body.

[0029] When the aquatic state is determined, transparency is an important parameter affecting the light compensation depth, and the water body transparency is controlled to be 0.6 - 0.8 times the light compensation depth of submerged plants. Combining the light compensation point data of different submerged plants, the general water depth control parameters for submerged plants are that the water depth for Ceratophyllum demersum is controlled at 0.5 - 1.0 m, for Najas marina at 0.5 m - 2.0 m, and for Hydrilla verticillata at around 0.5 m.

[0030] When the particulate matter flowing into the water is high, a water storage dam and a flow guiding facility can be installed, and emergent plants can be cultivated in the incoming water rapid flow area to play a retention role, slow down the flow velocity of the water, increase the sedimentation rate of water particles, and improve the transparency. In the initial stage of cultivation, by lowering the water level of the multi - pond wetland, light can be irradiated to the bottom of the water, which is beneficial to the photosynthesis of submerged plants.

[0031] Referring to FIGS. 2 and 3, the water level adjustment device 1 includes a support plate 11, a reel 12, a pulling rope 13, a counterweight ring 14, a corrugated pipe 15, a drain pipe 16 and a positioning and adjusting mechanism 17. The support plate 11 is installed on the upper end surface of the pool. The reel 12 is rotatably mounted on the upper end surface of the support plate 11. Specifically, two fixed blocks 121 are arranged on the support plate 11 at intervals. Both ends of the reel 12 are respectively inserted into the two fixed blocks 121 and are rotatably fitted to the fixed blocks 121. Bolts 122 are screwed onto the fixed blocks 121. The bolts 122 penetrate the fixed blocks 121 and are slidably fitted to the circumferential surface of the reel 12. A torsion spring is connected at the connection position between the reel 12 and the fixed block 121. One end of the pulling rope 13 is fixed to the circumferential surface of the reel 12. The other end of the pulling rope 13 penetrates the support plate 11 and is connected to the counterweight ring 14. The pulling rope 13 and the support plate 11 are slidably fitted. The counterweight ring 14 is fixed to the upper end surface of the corrugated pipe 15. One end of the drain pipe 16 is communicated with the lower end of the corrugated pipe 15. The other end of the drain pipe 16 penetrates the pool and extends to the outside of the pool.

[0032] The positioning and adjusting mechanism 17 includes a measuring rod 171 and a pointer 172. The upper end of the measuring rod 171 is located above the support plate 11. The lower end of the measuring rod 171 penetrates the support plate 11 and is screwed to the counterweight ring 14. A threaded hole is opened on the upper end surface of the counterweight ring 15. On the circumferential surface of the measuring rod 171 and near the lower end, a male thread that fits with the threaded hole is arranged. Further, a through hole 111 is opened on the support plate 11. A plurality of ball grooves 112 are opened on the hole wall of the through hole 111. The number of ball grooves 112 is at least two. Balls 18 are rotatably connected in the ball grooves 112. The measuring rod 171 penetrates the through hole 111, and the balls 18 are rollingly fitted to the circumferential surface of the measuring rod 171, so as to reduce the frictional force when the measuring rod 171 moves along the support rod. The pointer 172 is fixed to the upper end of the support plate 11. One end of the pointer 172 is attached to the circumferential surface of the measuring rod 171. By changing the relative position between the measuring rod 171 and the pointer 172, the current water level can be measured.

[0033] When the water level in the pond rises, the support plate 11 rises with the rise of the water level. The reel 12 rotates to extend the pulling rope 13. The support plate 11 moves away from the counterweight ring 14, and a relative displacement occurs between the measuring rod 171 and the pointer 172 to measure the water level. When the water level of the pond rises, the excess water is discharged through the corrugated tube 15, but the discharge speed is limited, that is, the water outflow is limited. When it meets heavy rain or other forms of large inflow of water bodies, the support plate 11 rises significantly. At this time, the excess water is discharged from the drain pipe 16 through the corrugated tube 15. With the subsequent drop in the water level, the support plate 11 returns to its original position under the action of the counterweight ring 14 to complete the water level adjustment. The water level adjustment device 1 in the embodiment of the present application can freely control the water level by setting the upper limit of the water level.

[0034] Step S3: In order to increase the dissolved oxygen in the water body, the mud-water interface is aerated using the aeration device 2.

[0035] Referring to FIG. 4, the aeration device 2 includes a nano-fine bubble aeration pipe 21, a Roots-type frequency conversion blower 22, an oxidation-reduction potential automatic monitoring device 23, and a programmable logic controller 24. Considering that normal aeration increases the flow velocity of the water flow, there is also agitation in the bottom mud, which affects the growth of submerged plants and also affects the water transparency. Therefore, in the embodiment of the present application, the nano-fine bubble aeration pipe 21 is used to aerate the mud-water interface, increase the dissolved oxygen (DO) level at the mud-water interface, and further increase the oxidation-reduction potential of the surface sediment. The fine bubble aeration pipe 21 is attached to be fixed at the bottom of the pond, and a fixing plate is attached to be fixed at the bottom of the pond. The nano-fine bubble aeration pipe 21 is wound around the fixing plate to form a plurality of concentric and spaced annular aeration pipes. The interval between adjacent fine bubble aeration pipes 21 in the fixing plate is 3 - 5 cm. The fine bubble aeration pipe 21 contains supported silver zeolite and has an antibacterial agent and an algae-proof agent on its surface. The Roots-type frequency conversion blower 22 is arranged outside the pond. The Roots-type frequency conversion blower 22 and the fine bubble aeration pipe 21 are connected through a long rubber tube. The oxidation-reduction potential automatic monitoring device 23 is arranged at the position between the upper layer of water and the surface of the bottom mud to detect the dynamic changes of the oxidation-reduction potential of the mud-water cross-section in real time. The oxidation-reduction potential automatic monitoring device 23 is electrically connected to the Roots-type frequency conversion blower 22 through the programmable logic controller 24 to adjust the aeration volume of the Roots-type frequency conversion blower 22 in real time, achieve accurate aeration, and keep the oxidation-reduction potential of the mud-water cross-section between -100 mV and -30 mV. The fine bubble aeration method adopted in the embodiment of the present application has advantages such as a long bubble residence time, high oxygen filling efficiency, small interference to the surface sediment, and low aeration energy consumption compared with the conventional aeration method. A surface bottom mud sampling pipe 3 communicating with the inside of the pond is fixed on the side wall of the pond. The bottom mud is collected through the surface bottom mud sampling pipe 3, the properties of the bottom mud are analyzed, the nutrient and pollution status of the pond are judged, and a basis is provided for subsequent operations.

[0036] Step S4: After planting submerged plants and laying the subgrade improvement material for 2 - 3 days, cultivate pollution-resistant emergent plants and submerged plants in the covered area of the subgrade improvement material.

[0037] The pollution-resistant emergent plants are one or more combinations of water caltrop, arrowhead, and water chestnut. The pollution-resistant submerged plants are one or more combinations of twisted pondweed, black pondweed, water milfoil, and water thyme. Through the co-cultivation of emergent plants and submerged plants, it can effectively reduce the pollution of sediment such as nitrogen and phosphorus, purify the upper water body, and also expect the beautification effect of the river because the plants have ornamental value.

[0038] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these amendments and modifications of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

[0039] The above are only preferred specific embodiments of the embodiments of this application, but the protection scope of this application is not limited thereto. Those skilled in the art who make equivalent substitutions or changes based on the technical solution and its concept of this application within the technical scope disclosed by this application should be included within the protection scope of this application.

Description of Reference Signs

[0040] Water level regulating device; 11, support plate; 111, through hole; 112, ball groove; 12, reel; 121, fixed block; 122, bolt; 13, towing rope; 14, counterweight ring; 15, corrugated pipe; 16, drain pipe; 17, positioning and adjusting mechanism; 171, measuring rod; 172, pointer; 18, ball; 2, aeration device; 21, fine bubble aeration pipe; 22, roots type frequency conversion blower; 23, oxidation-reduction potential automatic monitoring device; 24, programmable logic controller; 3, surface sediment sampling pipe.

Claims

1. A method for restoring submerged plants in a multi-pond wetland, To repair the ecological environment of the bottom mud, a subgrade improvement material is uniformly put into the pond, and the thickness of the subgrade improvement material coating is 5 to 10 cm in step S1, In the initial stage of cultivation, the water level of the pond is lowered by the water level adjustment device (1) so that light irradiates the bottom of the water, promoting the photosynthesis of the submerged plants in the multi-pond wetland more. After the initial stage of cultivation, when increasing the transparency of the water body, the flow rate of the water flow when adding water to the pond is slower than the flow rate when adding water to the normal pond, increasing the sedimentation of particulate matter floating in the water in step S2, In order to increase the dissolved oxygen in the water body, step S3 of aerating the mud-water interface using the aeration device (2), Including step S4 of planting submerged plants, laying the subgrade improvement material for 2 to 3 days, and then cultivating pollution-resistant emergent plants and submerged plants in the coated area of the subgrade improvement material, The subgrade improvement material is made of raw materials with the following mass fractions, Modified biochar 60 - 70% Zeolite 10 - 20% Adhesive 20 - 30% The manufacturing method of the subgrade improvement material includes the following steps, which is a method for restoring submerged plants in a multi-pond wetland characterized by this. (1), Uniformly mix modified biochar, zeolite and adhesive in the above mass percentages, add 20% - 25% of the mixture mass of water, cure the mixture paste for 24 h, then soak it in water for curing, and the duration is 3 days. The modified biochar is clay / biochar obtained by supporting clay on the surface of biochar, and the adhesive is Portland cement. (2), Crush and screen the composite cured in (1) to obtain a subgrade improvement material with a particle size of 3 - 5 mm.

2. The method for restoring submerged plants in a multi-pond wetland according to claim 1, wherein the pollution-resistant emergent plants are one or more combinations of Typha latifolia, Phragmites australis, and Scirpus mariqueter.

3. The method for restoring submerged plants in a multi-pond wetland according to claim 1, wherein the pollution-resistant submerged plants are one or more combinations of Myriophyllum spicatum, Ceratophyllum demersum, Hydrilla verticillata, and Najas minor.

4. The water level adjustment device (1) includes a support plate (11), a reel (12), a towing rope (13), a counterweight ring (14), a corrugated pipe (15), a drain pipe (16), and a positioning adjustment mechanism (17), The support plate (11) is installed on the upper end surface of the pond. The reel (12) is rotatably mounted on the upper end surface of the support plate (11). One end of the towing rope (13) is fixed to the circumferential surface of the reel (12). The other end of the towing rope (13) penetrates the support plate (11) and is connected to the counterweight ring (14). The counterweight ring (14) is fixed to the upper end surface of the corrugated pipe (15). One end of the drain pipe (16) is communicated with the lower end of the corrugated pipe (15). The other end of the drain pipe (16) penetrates the pond and extends to the outside of the pond. The positioning and adjusting mechanism (17) includes a measuring rod (171) and a pointer (172). The lower end of the measuring rod (171) penetrates the support plate (11) and is fixed to the counterweight ring (14). The measuring rod (171) is slidably fitted to the support plate (11). The pointer (172) is fixed to the upper end of the support plate (11). One end of the pointer (172) is attached to the circumferential surface of the measuring rod (171). The method for recovering submerged plants in multi-pond wetlands according to claim 1, characterized in that.

5. A through hole (111) is formed in the support plate (11). A plurality of ball grooves (112) are formed in the hole wall of the through hole (111). A ball (18) is rotatably connected in the ball groove (112). The measuring rod (171) penetrates the through hole (111), and the ball (18) is rollingly fitted to the circumferential surface of the measuring rod (171). The method for recovering submerged plants in multi-pond wetlands according to claim 4, characterized in that.

6. A threaded hole is formed in the upper end surface of the counterweight ring (14). A male thread that fits with the threaded hole is arranged on the circumferential surface of the measuring rod (171) and near the lower end. The method for recovering submerged plants in multi-pond wetlands according to claim 4, characterized in that.

7. Two fixing blocks (121) are arranged on the support plate (11) at intervals. Both ends of the reel (12) are respectively inserted into the two fixing blocks (121) and are rotatably fitted to the fixing blocks (121). A bolt (122) is screwed onto the fixing block (121). The bolt (122) penetrates the fixing block (121) and is slidably fitted to the circumferential surface of the reel (12). The method for recovering submerged plants in multi-pond wetlands according to claim 4, characterized in that.

8. The aeration device (2) includes a nano-fine bubble aeration pipe (21), a Roots-type frequency conversion blower (22), an oxidation-reduction potential automatic monitoring device (23), and a programmable logic controller (24). The fine bubble aeration pipe (21) is arranged at the bottom of the pond, the Roots-type frequency conversion blower (22) is arranged outside the pond, and the Roots-type frequency conversion blower (22) and the fine bubble aeration pipe (21) are connected via a rubber tube. The oxidation-reduction potential automatic monitoring device (23) is arranged between the upper layer of water and the surface layer of the bottom mud. The oxidation-reduction potential automatic monitoring device (23) is electrically connected to the Roots-type frequency conversion blower (22) via a programmable logic controller (24). The method for restoring submerged plants in a multi-pond wetland according to claim 1 is characterized by the above.

9. The method for restoring submerged plants in a multi-pond wetland according to claim 8, characterized in that silver-supported zeolite is arranged on the fine bubble aeration pipe (21).

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