System and method for improving enhancement and release effect and near-shore ecological connectivity

Abstract

The invention provides a system and method for improving the enhancement and release effect and the near-shore ecological connectivity, and the system comprises a high-density seedling cultivation region which is used for cultivating seedlings and discharging tail water; the ecological rice field area is used for introducing the received tail water into the rice field and discharging the purified tail water; the ecological conservation area is used for receiving the purified tail water, regulating and controlling the water level by arranging an intelligent dam body, and completing temporary storage and conservation of the purified water body; and the embankment exterior wet area is connected with the ecological conservation area and is used for providing an adaptation and transition place for the seedlings before releasing. According to the method, by constructing a mutually communicated enhancement and release unit system, water recycling, ecological purification and seedling staged adaptive release are realized, so that the seedling survival rate and the release effect are remarkably improved, and ecological and economic cooperative gain is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological restoration, in particular to a system and method for improving the effect of propagation and release and the ecological connectivity of the near shore. BACKGROUND

[0002] Coastal areas are important bases for ecological system diversity and fishery production. Propagation and release has become an important means to restore aquatic biological resources and improve the ecological environment of water areas, but the traditional release method still has many constraints. In the traditional release process, due to improper selection of fry size, and lack of scientific planning of release time and location, the objective needs of different sizes of fry at different life history stages for habitat suitability are not fully considered, resulting in very low survival rate of fry and not producing real ecological and economic benefits. In addition, affected by reclamation and embankment construction, the ecological connectivity of near shore waters and wetlands is poor, and fry lack habitat transition during release and migration, resulting in limited release effect. Therefore, constructing a comprehensive propagation and release system with ecological restoration, water quality regulation and ecological connectivity can significantly improve the effect of propagation and release, effectively improve water quality and reduce pollution, thereby achieving the dual goals of coastal ecosystem restoration and fishery resource restoration.

[0003] To solve the above problems, the existing propagation and release technology generally focuses on the structural improvement of the release device or the construction of local ecological buffer measures, but lacks overall systematization and is difficult to balance the release effect and ecological connectivity. For example, patent document CN120077980A and patent document CN119837062A reduce the mechanical damage to fry during release by setting buffer cavities, shunt devices or guide pipes in the release device to increase survival rate. Although this kind of technical solution improves the safety of release to some extent, its improvement range is limited to the release device itself, and it does not consider the adaptability of fry and the ecological effect after release in combination with the actual situation of near shore waters. The release effect is still affected by environmental mutation, water quality difference and insufficient ecological connectivity, and lacks certain regulation mechanism. Some other technologies (such as patent documents CN119856695A, CN119744792A and CN119631932A) introduce buffer pools or filtration and purification units in the release device or channel to provide a temporary buffer environment for fry. Although this kind of solution can produce certain propagation and release effect, the functional units are independent of each other, and still use the single release, single adaptation mode, without considering the ecological needs of fry at different life history stages. At the same time, it lacks synergy with coastal farmland utilization, water purification and wetland ecological restoration, resulting in limited ecological and economic benefits of overall propagation and release. SUMMARY

[0004] Aiming at the defects in the prior art, the present application aims to provide a system and method for improving proliferation and release effect and nearshore ecological connectivity.

[0005] The system for improving proliferation and release effect and nearshore ecological connectivity provided by the present application comprises: A high-density seedling cultivation area for cultivating seedlings and discharging tail water; An ecological rice field area for introducing the received tail water into the rice field and discharging purified tail water; An ecological conservation area for receiving the purified tail water, regulating the water level by setting an intelligent dam body, and temporarily storing and conserving the purified water; An off-dike wetland area connected with the ecological conservation area for providing an adaptation and transition place for seedlings before release.

[0006] Preferably, the high-density seedling cultivation area and the ecological rice field area are connected by a pipeline, the individual specifications of the seedlings are regularly sampled, and when the preset value-added release standard is met, the seedlings are introduced into the ecological rice field area through the pipeline.

[0007] Preferably, the ecological rice field area introduces the incoming water into the rice field in a deflection manner through a diversion ridge, and adjusts the water flow by arranging soil ridges and ridges to ensure that the water flow stays in the rice field for a sufficient time.

[0008] Preferably, an ecological floating island is arranged in the ecological conservation area to cultivate crops, the rice field tail water is introduced through a pipeline, and the purified water is reintroduced into the high-density seedling cultivation area through a water pump to complete water circulation.

[0009] Preferably, the water level of the ecological conservation area is controlled by setting an intelligent dam body, and the ecological wetland outside the dike is connected through a pipeline and a sluice.

[0010] Preferably, the off-dike wetland area comprises a salt gradient water body and a tidal ditch structure with salt content from low to high.

[0011] The method for improving proliferation and release effect and nearshore ecological connectivity provided by the present application comprises: Step S1: introducing seedlings into the high-density seedling cultivation area for cultivation, and discharging seedling tail water into the ecological rice field area; Step S2: making the ecological rice field area receive the seedling tail water and irrigate the rice field, and discharging the rice field tail water into the ecological conservation area; Step S3: making the ecological conservation area receive the rice field tail water, regulating the water level by an intelligent dam body, and conserving the clear water and returning it to the high-density seedling cultivation area through a water pump.

[0012] Preferably, the method further comprises: Step S4: If the seedling grows to meet the preset value-added release standard, it is allowed to pass through the sluice or pipeline into the ecological wetland outside the dam, and the seedling after adapting to the environment is sent to the natural water area near the shore.

[0013] Preferably, the ecological rice field area is connected to the water inlet through a diversion dike, and the water inlet is adjusted by arranging soil dikes and dikes to ensure that the water flow stays in the rice field for a sufficient time.

[0014] Preferably, the seedlings are gradually adapted to different salinity and water environments in the high-density seedling cultivation area, the ecological rice field area, the ecological conservation area, and the wetland outside the dam to complete the staged transition.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1. The present application improves the survival rate and ecological adaptability of seedling release. The present application introduces suitable seedlings for rapid cultivation in the high-density seedling cultivation area. When the seedlings grow to meet the requirements of the proliferation release, they are released into the tidal ditch of the ecological rice field area and enter the ecological conservation area through the tidal ditch. Then the seedlings enter the ecological wetland outside the dam (riverbank) through the sluice or pipeline. The seedlings that gradually adapt to the low-salt environment can actively enter the natural water area near the shore through the wetland outlet, and finally complete the staged proliferation release process. The present application fully considers the objective needs of different specifications of seedlings in different life history stages for habitat suitability in space-time layout. Through the ladder structure of "seedling cultivation-rice field purification-conservation regulation-wetland transition-natural water release", the present application realizes the adaptability transfer of seedlings in different habitat stages, and significantly improves the survival rate of release.

[0016] 2. The present application strengthens the ecological connectivity and system stability. Through the reasonable layout of the tidal ditch and wetland structure, the present application establishes the hydrological and biological channels of the artificial and natural ecological system along the coast, promotes fish migration and ecological system reconstruction. By using the structures such as tidal ditch, sluice and underground pipeline, the present application realizes the continuous hydrological channel of "inland aquaculture system-rice field ecological system-nearshore wetland system-natural water area", restores and enhances the water power exchange and material circulation in the coastal area, promotes the natural reconstruction of plankton, benthic organisms and aquatic plant communities, and provides breeding sites for fish, crustaceans and amphibians, thereby improving the integrity and diversity of the ecological system. In addition, the system forms a circulating network with automatic recovery function, so that the water body has strong self-regulation and anti-disturbance ability, and can maintain a good ecological balance state for a long time.

[0017] 3、The present application realizes water quality recycling purification and efficient use of resources, the tail water in the system is purified step by step through the ecological rice field and the conservation area, reduces the accumulation of nitrogen and phosphorus and water eutrophication, at the same time realizes the sharing of nutrients between rice and fish, improves the efficiency of resource utilization. Through the water inlet and outlet of the multiple collaborative breeding area, the rice field area and the conservation area, the internal water circulation is formed. The nutrients in the tail water of the system are effectively removed by using static sedimentation, soil adsorption, plant absorption and microbial nitrification and denitrification, the residual bait and metabolites in the water body become the nutrient source of the rice field after decomposition, realizing the coupling benefits of "fishing to fertilize the field and field to purify water", and reducing the pollution risk of the present application to the minimum.

[0018] 4、The present application takes into account economic benefits and ecological environmental benefits, improves fishery output and ecological function on the basis of not affecting agricultural production, realizes comprehensive benefits such as rice field income increase, wetland restoration, carbon emission reduction (reducing methane emission) and the like. The system can realize rice-fish compound management, the rice field area provides seedling release and ecological purification double functions while ensuring the yield of rice. In addition, due to the tidal flow and low flow rate water flow operation of the system, the oxygen-anaerobic alternating conditions are formed in the internal area of the system, which is beneficial to increase the dissolved oxygen content of the water body and effectively reduce methane, and has a significant carbon emission reduction effect.

[0019] 5、The present application promotes regional ecological safety and sustainable development, by enhancing the ecological connectivity along the coast and improving the habitat quality of aquatic organisms, the present application helps to restore the ecological buffer function of estuary and nearshore zone, and improves the ability of the region to resist extreme climate events (such as flood, storm surge). Through efficient use of original space resources, the flood control and waterlogging performance and water source regulation and storage capacity of the region are improved. The system does not need to input a large amount of chemical fertilizer and chemical agent during operation, the overall energy consumption is low, and long-period operation and low maintenance cost can be realized. The method can be flexibly adjusted according to different regional topography and hydrological conditions, has good replicability and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 A schematic diagram for realizing rice-fish regional comprehensive efficiency of the present application of agro-forestry wet complex.

[0021] Figure 2 A planar schematic diagram for realizing rice-fish regional comprehensive efficiency of the present application of agro-forestry wet complex.

[0022] Explanation of reference signs: Ecological rice field area 1; diversion field ridge 11; fish pond tidal ditch 12; high-density seedling cultivation area 2; aeration pump 21; ecological conservation area 3; ecological floating island 31; submerged plant area 32; ecological hydroponic area 33; intelligent lifting dam 34; off-dike wetland area 4; dike or riverbank 5; culvert or pipeline 6; water pump 7; nearshore natural water area 8. DETAILED DESCRIPTION

[0023] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These are within the scope of the application.

[0024] A system for improving proliferation and release effect and nearshore ecological connectivity, comprising: High-density seedling cultivation area 2 for cultivating seedlings and discharging tail water; Ecological rice field area 1 for introducing received tail water into rice field and discharging purified tail water; Ecological conservation area 3 for receiving purified tail water, regulating water level by setting intelligent dam body, and completing temporary storage and conservation of purified water body; Off-dike wetland area 4 connected with the ecological conservation area 3 for providing adaptation and transition place for seedlings before release.

[0025] Specifically: High-density seedling cultivation area 2: high-density rapid cultivation for proliferation and release of seedlings. The original fish pond is modified in length, width, water depth and slope, and multiple groups of aeration pumps 21 are arranged at the bottom and equipped with water diversion devices. Floating high-density aquaculture facilities are introduced, and fish and shrimp seedlings are cultivated in the pond. The tail water produced during cultivation contains residual feed, biological detritus and nutrient salts, which is connected with the ecological rice field area 1 through the tail water diversion pipe.

[0026] Ecological rice field area 1: having rice production and water quality purification functions. The ridge is arranged to guide the ecological hydroponic area 33 to flow into the rice field, and the overflow port is arranged at the end to collect into the ecological pond area. After the tail water enters the rice field, the rice field ecological system absorbs and transforms nutrient salts and purifies the water quality, and the effluent flows into the ecological conservation area 3. The ridge is raised and reinforced, and a ring tidal ditch is excavated on the inner side of the ridge for seedling activities, and the ecological conservation area 3 is introduced.

[0027] Ecological conservation area 3: By setting intelligent dam body to regulate water level, the temporary storage and conservation of purified water body are realized. According to the actual topography, the micro river or low-lying area can be reconstructed in this area. The conservation area is connected with the high-density seedling cultivation area 2 through the circulating backwater pump 7, and the purified water backflow is used to supplement the water source of the cultivation area to maintain the stability of the water quality in the system. The floating island is set up, and the ornamental aquatic plants and aquatic vegetables are planted, and the local submerged plants are planted at the bottom of the water, and the water crops such as water caltrop are planted in the open water area, and the nutrients in the tail water of the rice field area are removed through ecological sedimentation and plant absorption.

[0028] Dike wetland area 4: It is set outside the dike or river bank 5, has a gradient water body from low salt to high salt and a tidal ditch structure, provides a place for seedlings to adapt and transition before release. The outlet of the wetland area is connected with the nearshore natural water area 8 to realize the natural migration and ecological return of the seedlings.

[0029] In another embodiment, the system comprises: High-density seedling cultivation area 2: The seedling cultivation area is constructed by reconstructing the original terrain. The floating high-density aquaculture facilities are installed in the cultivation area to further optimize the breeding space. The tail water and organic particulate matter in the cultivation area are introduced into the ecological rice field area 1 through the pipeline for purification according to the actual situation of the propagation and release requirements. According to the actual situation of the propagation and release requirements, grass carp, blue carp, crucian carp, yellow catfish, Chinese river shrimp, knife gizzard shad, Chinese mitten crab and other seedlings can be introduced into the cultivation area. The individual specifications of the seedlings are regularly sampled and checked, and when the seedlings meet the corresponding propagation and release standards, the seedlings that meet the specifications can be introduced into the ecological rice field area 1 through the pipeline.

[0030] Ecological rice field area 1: By designing reasonable water flow path and flow rate control, the tail water from the high-density seedling cultivation area 2 is effectively purified, and the purified tail water flows into the ecological conservation area 3. The water enters the rice field in a deflection manner through the guide ridge 11, and the water flow is adjusted and ensured to stay in the rice field for a preset time to complete the purification process through the reasonable arrangement of the soil ridge and the ridge. The preset time T can be calculated by the following formula:

[0031] Wherein, V is the water storage capacity of the rice field, and Q is the tail water discharge flow.

[0032] The wastewater discharged from the high-density seedling cultivation area 2 flows through the paddy field in a tidal manner. Nutrients in the wastewater are effectively removed through soil adsorption, plant absorption, and microbial nitrification and denitrification. This process not only replaces the application of chemical fertilizers but also achieves wastewater purification and reuse through the natural purification capacity of the paddy field. Fish ponds and tidal ditches 12 are set up in the paddy field to facilitate seedling activity. The seedlings can feed on weeds, algae, and pests in the paddy field and rest in the fish ponds and tidal ditches 12 when the paddy field dries up. The activity of the seedlings in the paddy field promotes the absorption of dissolved oxygen and nutrients by the rice roots, and their excrement can also supplement fertilizer for the rice and increase soil nutrients.

[0033] Ecological Conservation Zone 3: Ecological Conservation Zone 3 features floating ecological islands 31 for cultivating suitable hydroponic crops such as water spinach, water celery, and cattails, as well as ornamental flowers. An ecological hydroponic area 33 can be established within Ecological Conservation Zone 3, where aquatic economic crops such as water chestnuts, water caltrops, and lotus roots can be grown. The planting of water chestnuts and lotus roots is adjusted according to water depth, and weeds are regularly removed from the fields to maintain water quality. The vegetation community in this area not only plays a vital role in water purification but also provides habitats for aquatic organisms, promoting ecological restoration. Wastewater from the paddy fields is piped into the conservation zone. After deep purification in Ecological Conservation Zone 3, the wastewater is pumped by water pump 7 into the high-density seedling cultivation area 2 to complete the water cycle. A smart lifting dam 34 is installed at the outlet of the conservation zone to control the water level in Ecological Conservation Zone 3 and connects to the ecological wetland outside the dike via a sluice gate or pipe 6, allowing suitable seedlings to be released into the wetland.

[0034] Outside the dike wetland area 4: A culvert or pipeline 6 is installed to connect the ecological conservation area 3 and the outside wetland area 4. When the intelligent lifting dam 34 of the ecological conservation area 3 is lowered, the stocking seedlings can enter the outside wetland area 4 with the water flow through the culvert or pipeline 6. The seedlings, which gradually adapt to the low-salt environment, can actively enter the near-shore natural water area 8 through the wetland outlet, and finally complete the step-by-step stocking process.

[0035] A method for improving the effectiveness of stock enhancement and nearshore ecological connectivity includes: Step S1: Introduce seedlings into the high-density seedling cultivation area 2 for cultivation, and discharge the seedling tailwater into the ecological paddy field area 1; Step S2: The ecological paddy field area 1 receives the seedling tailwater and irrigates the paddy field, and the paddy field tailwater is discharged into the ecological conservation area 3. Step S3: The ecological conservation area 3 receives the tailwater from the paddy field, and the water level is regulated by the intelligent dam. The conserved clean water is pumped back to the high-density seedling cultivation area 2 by the water pump 7.

[0036] Step S4: If the seedlings grow to meet the preset value-added release standard, they are sent through the culvert or pipeline 6 into the ecological wetland outside the dam, and the seedlings that have adapted to the environment are sent into the near-shore natural waters 8.

[0037] In one embodiment, the specific steps include: First, build high-density seedling cultivation area 2, ecological rice field area 1, ecological conservation area 3, and dike outside wetland area 4 units; introduce suitable seedlings into the high-density seedling cultivation area 2 for rapid cultivation, and the residual bait, biological detritus and the like generated during the cultivation process are discharged into the ecological rice field area 1 in a tidal flow manner with tail water, thereby maintaining the aerobic-anaerobic alternating conditions of the ecological rice field area 1, promoting tail water purification, and controlling methane emissions; The ecological rice field area absorbs and removes nitrogen and phosphorus nutrients, and the organic particulate matter such as residual bait can replace fertilizers to promote the growth of rice, and the purified tail water of the ecological rice field enters the ecological conservation area 3. The ecological conservation area 3 uses an intelligent dam to regulate the water level, and the clean water is lifted back to the high-density seedling cultivation area 2 by a water pump 7 to ensure the health of the water quality. When the seedlings grow to the required size for propagation and release, they are released into the fish and shrimp tidal ditch 12 in the ecological rice field area 1, and then enter the ecological conservation area 3 through the fish and shrimp tidal ditch 12. Subsequently, the seedlings enter the ecological wetland area outside the dike or riverbank 5 through a sluice or pipeline 6, and the seedlings that gradually adapt to the low-salinity environment can actively enter the nearshore natural water area 8 through the wetland outlet, completing the step-by-step propagation and release process.

[0038] The seedlings gradually adapt to different salinity and water environments in the high-density seedling cultivation area 2, the ecological rice field area 1, the ecological conservation area 3, and the dike outside wetland area 4, realizing phased transition and significantly reducing the release stress response, meeting the habitat needs of seedlings at different life stages from the cultivation period to the natural return period. In terms of enhancing the ecological connectivity of nearshore waters, the intelligent dam, tidal ditch, pipeline, sluice and the like are used to realize the natural transition and connectivity of coastal farmland, water area and nearshore wetland, providing a migration channel for local species and released seedlings, improving the structure of the nearshore ecosystem, and promoting the sustainable recovery of resources.

[0039] Embodiment 1 A system for improving the propagation and release effect and the nearshore ecological connectivity, comprising a high-density seedling cultivation area 2, an ecological rice field area 1, an ecological conservation area 3, and a dike outside wetland area 4.

[0040] In the system, different areas are connected in sequence through pipelines, ditches, and rivers.

[0041] As shown in Figure 1 The high-density seedling cultivation area 2 discharges nutrient-rich tail water to the ecological rice field area 1 in a tidal flow manner, and the tail water contains seedlings. When discharging, seedlings that meet the specifications are released into the ecological rice field area 1. After the tail water stays for a predetermined time, it completes irrigation of the rice field and is purified. The purified water and seedlings in the water are temporarily stored in the ecological conservation area 3. The ecological conservation area 3 returns the ecologically purified water to the high-density seedling cultivation area 2, forming a water cycle.

[0042] Dikes, river banks are set between ecological conservation area 3 and ecological wetland area, and are connected through culvert or pipeline 6; seedlings enter ecological wetland area from culvert or pipeline 6 through the opening and closing of dikes, and the ecological wetland area actively enters the nearshore natural water area 8 with the seedlings adapted to the environment.

[0043] Among them, high-density seedling cultivation area 2 is provided with aeration pump 21, mud suction pump and water body circulation device; ecological rice field area 1 is provided with flow guide field ridge 11 and fish pond tidal ditch 12; ecological conservation area 3 is provided with ecological floating island 31 and planted with ornamental economic crops, and water economic crops such as water caltrop and lotus are planted in open water area, and intelligent lifting dam 34 is set to regulate water level, realizing temporary storage and conservation of purified water. The width of the intelligent lifting dam 34 is 8 m, and overflow sections are set on both sides, and the length of the overflow section to the length of the lifting dam is 0.4-0.8. The system is adjusted through existing automatic control facilities: when the water level is insufficient, the lifting dam is used for regulation and storage, so that the water body is detained in the ecological conservation area 3; when the water level is too high, the water pump 7 is used to introduce the purified water in the conservation area into the high-density seedling cultivation area 2 to complete the water circulation, and the proliferated and released seedlings can also enter the ecological wetland area outside the dike through the culvert or pipeline 6 with the water flow. The wetland area 4 outside the dike is provided with culvert or pipeline 6 connected with the conservation area.

[0044] As shown in Figure 2 The present scheme provides an agricultural ecological system for grading water purification, comprising: The ecological rice field area 1 is internally provided with flow guide field ridge 11 for guiding water flow and fish pond tidal ditch 12 for water storage and biological habitat; The downstream is connected with high-density seedling cultivation area 2, which is provided with aeration pump 21 to maintain water body dissolved oxygen, followed by ecological conservation area 3, which is sequentially arranged with ecological floating island 31, submerged plant area 32 and ecological hydroponic area 33, and the terminal is provided with intelligent lifting dam 34 for water level regulation; The water body is overflowed to the wetland area 4 outside the dike for further purification and seepage; The whole system takes the dike or river bank 5 as the boundary, controls the connection through the culvert or pipeline 6, and realizes cross-area water transfer and circulation by the water pump 7.

[0045] High-density seedling cultivation area 2: Install multiple sets of aeration pumps 21 and suction pumps at the bottom of the cultivation area. Ensure sufficient oxygen supply to the water body while recycling organic particulate matter such as leftover feed and biological detritus generated during cultivation using the suction pump. Introduce the tail water and organic particulate matter from the cultivation area into the ecological rice field area 1 through the sluice or pipeline 6 at regular intervals. Install floating high-density aquaculture facilities and introduce grass carp, blue carp, crucian carp, yellow catfish, Chinese prawn, knife gizzard shad, Chinese mitten crab, and other seedlings into the cultivation area according to the actual situation of propagation and release requirements. Regularly sample and inspect the size of the seedlings. Randomly sample at least 60 fish and shrimp per batch, record the length, weight, abnormality rate of body color (percentage of the number of individuals with abnormal body color in the total number of sampled seedlings), mortality rate (percentage of the number of dead individuals in the total number of sampled seedlings), dirty hanging rate (percentage of the number of individuals with attached matter other than ciliates on the body surface in the total number of sampled seedlings), injury rate (percentage of the number of individuals with developmental abnormalities or limb deformities, damage in the total number of aquatic organisms), and size qualification rate (percentage of the number of individuals meeting size requirements in the total number of sampled seedlings). When the size qualification rate is ≥85%, the sum of mortality rate, injury rate, abnormality rate of body color, and dirty hanging rate is ≤5%, the average length of fish is ≥80mm, and the average length of shrimp is ≥25mm, introduce the seedlings that meet the size requirements into the ecological rice field area 1 through the sluice or pipeline 6.

[0046] Ecological rice field area 1: Set up a guide dike 11 in the rice field to make the water from the cultivation area pass through the rice field in a deflection manner and at a low flow rate. The tail water discharged from the high-density seedling cultivation area 2 flows in the rice field in a tidal flow manner, and the suspended solids and nutrients such as nitrogen and phosphorus in the tail water are effectively removed through soil adsorption, plant absorption, and microbial nitrification and denitrification. This process not only saves the cost of rice field fertilization but also purifies and recycles the tail water through the purification capacity of the rice field. Plant one to two seedlings per hole per mu of rice, with a planting depth of 2-3cm. Plant plants such as clover on the slope and dike to stabilize the slope. Dig fish pond ring tidal ditches 12 in the inside of the dike for the movement of seedlings. Dig at least one fish pond tidal ditch 12 every 3-5 mu of rice field, with a total area of 5-10% of the rice field area. At least one outlet of the fish pond tidal ditch 12 is located near the ecological conservation area 3, facilitating the entry of seedlings into the ecological conservation area 3. Seedlings can feed on weeds, algae, and pests in the rice field, promote the absorption of dissolved oxygen and nutrients by the roots of rice, and supplement the fertilizer for rice with their excrement, increasing the soil nutrients.

[0047] Ecological conservation area 3: Ecological floating islands 31 are set up in the ecological conservation area 3 to cultivate suitable water-cultivated crops, such as economic vegetables like water spinach, water celery, etc., or ornamental flowers like iris, cattail, water lily, etc. In the ecological conservation area 3, an ecological water-cultivated area 33 is also set up, and the planting area of the water-cultivated area accounts for 40-50% of the conservation area. The area can be planted with water economic crops such as water bamboo, water caltrop, lotus root, etc. The planting of water caltrop and lotus root is adjusted according to the water depth, and a row spacing of 1 square meter is used, and 65-90 kg of seed is used per mu. When the water caltrop seedlings grow 2-3 true leaves, they can be transplanted. During the growth period of the water crops, weeds in the field are regularly removed and the water quality is kept clean. The intake of the conservation area is introduced into the tail water of the paddy field area through the sluice or pipeline 6, and the intelligent lifting dam 34 in the conservation area controls the water level through automatic facilities, and the purified tail water is introduced into the high-density seedling cultivation area 2 to complete the water circulation. The sluice or pipeline 6 is set up at the outlet of the conservation area and connected with the ecological wetland outside the dike, which can introduce the suitable seedlings for release into the wetland.

[0048] Dike outside wetland area 4: The sluice or pipeline 6 is set up in the natural wetland area outside the dike to connect the ecological conservation area 3 and the dike outside wetland area 4. After the intelligent lifting dam 34 of the ecological conservation area 3 is lowered, the proliferated seedlings can enter the dike outside wetland area 4 through the sluice or pipeline 6 with the water flow. The seedlings that gradually adapt to the low-salt environment can actively enter the nearshore natural water area 8 through the wetland outlet, and finally complete the stepwise proliferation and release process, realizing the natural migration and ecological return of the seedlings.

[0049] Example 2 Taking the wetland area of Chenjia Town, Chongming District, Shanghai as an example, the area is 4200 m², of which the pond area is 2200 m² and the cultivated land area is 2000 m². The overall area is rectangular, the left side is originally flat farmland without dikes, and the south end originally has a water outlet and a ditch.

[0050] The system in this embodiment includes a high-density seedling cultivation area 2, an ecological paddy field area 1, an ecological conservation area 3, and a dike outside wetland area 4.

[0051] The construction process of each part is as follows: High-density seedling cultivation area 2 The high-density aquaculture area covers a total area of ​​1000 m². Through the modification of the aquaculture ponds, the rearing area is designed with a length-to-width ratio of 1:2 to 1:5 and a slope ratio of 1:1.5 to 1:3. The water depth is no less than 1.5 meters, with a bottom elevation of 1.05 m and a water surface elevation of 3.05 m. The inlet is located in the northeast-southeast of the aquaculture area, and the outlet is located in the northwest corner. Water pumps 7 are installed at both the inlet and outlet to transport water. A culvert or pipeline 6 is also installed at the outlet to connect to the paddy field, allowing qualified seedlings to flow into the paddy field. A sludge suction pump is installed to collect uneaten feed, biological debris, and other organic particles, and the aquaculture wastewater is introduced into the ecological paddy field area 1. An aeration pump 21 is installed at the bottom every 5 m, for a total of 10 sets of aeration pumps 21. The aquaculture space is further optimized by installing floating high-density aquaculture facilities. Juvenile grass carp, black carp, crucian carp, yellow catfish, freshwater shrimp, anchovy, and Chinese mitten crab are introduced into the aquaculture facilities. Regularly sample and inspect the individual specifications of the fry. For each batch, randomly sample at stratified levels, taking no fewer than 60 fish and shrimp fry per fry. Record indicators such as body length, weight, abnormal body color rate, mortality rate, visceration rate, injury rate, and specification qualification rate. When the specification qualification rate is ≥85%, the sum of mortality and injury rate, abnormal body color rate, and visceration rate is ≤5%, the average length of fish is ≥80mm, and the average body length of shrimp is ≥25mm, introduce the qualified fry into the ecological rice paddy area 1 through a culvert or pipeline 6.

[0052] Ecological rice paddy area 1 The existing paddy field will be modified. The total area of ​​the paddy field is approximately 2000 m², with an effective water depth maintained at 5-20 cm. The bottom elevation is 3.00 m, the water surface elevation is 3.05 m, and the elevation of the surrounding earthwork is 3.20 m. The inlet is located in the northeast corner of the paddy field, and the outlet is located in the southeast corner. A water pump 7 will be installed about 5 cm below the bottom of the paddy field on the outer earthwork to transport water. A culvert or pipeline 6 will be installed at the outlet to connect to a pond, allowing the outflowing water to flow into the pond. A tidal flow paddy field will be implemented, with water intake from 8:00 to 11:00 and a flow rate of 3 m³ / s. 3 The flow rate is approximately 15-30 meters per hour. Water is slowly released after 11:00 AM and drained by approximately 6:00 PM, with a submersion / drainage period of 10 hours / 14 hours, which is the preset residence time. East-west oriented dikes are arranged within the rice paddy wetland to guide the water through the paddy fields in a deflected flow pattern. The height of the dikes is maintained above 20 cm, with gaps left between them and the paddy field ridges. The ratio of the gap length to the ridge length is controlled between 0.5 and 0.8. Clover and other plants are planted on the slopes and ridges for slope protection and stabilization. In every 3-5 mu (approximately 0.2-0.5 acres) of paddy field, at least one fishpond ditch 12 should be dug. The fishpond ditch 12 should be 0.5-1m deep and 0.3-0.8m wide, with its total area accounting for 5-10% of the paddy field area. A separate fishpond ditch 12 outlet should be located near the ecological conservation area 3 to facilitate the entry of seedlings into the ecological conservation area 3. Plant 1-2 rice seedlings per hill per mu (approximately 0.067 acres), with a planting depth of 2-3cm.

[0053] Ecological conservation area 3 The ecological conservation area 3 has a total area of 1200 m2, an average water depth of no more than 50 cm, and a water level of about 3.5 m, wherein the bottom elevation is 3.1 m and the water surface elevation is 3.5 m. The conservation area is installed with 31 ecological floating islands, and economic vegetables such as water spinach and water celery or ornamental flowers such as Iris, Typha, and Nymphaea are planted. There is a submerged plant area 32 at the bottom of the conservation area for planting local submerged plants such as Myriophyllum, Hydrilla, and Vallisneria. The density of submerged plants is 10-20 plants / m2, and the planting area accounts for 20-30% of the conservation area. In addition, an ecological hydroponic area 33 is set up in the ecological conservation area 3, and the hydroponic area accounts for 40-50% of the conservation area. The area is planted with aquatic economic crops such as Zizania latifolia, Trapa, and Lotus root, and a 1-meter-square spacing is used, with a seed amount of 65-90 kg per mu. The spacing of shallow water calyx is 1.5-2 meters, and one bundle of about 2-3 Trapa seedlings is planted in each hole. The water inlet is located on the northeast side, and the tail water of the paddy field is introduced through the water pump 7 and the sluice or pipeline 6. The water outlet is located on the southwest side, and the purified tail water is introduced into the high-density seedling cultivation area 2 through the water pump 7 to complete the water circulation. The intelligent lifting dam 34 is installed on the south side of the conservation area to control the water level through automatic facilities, and the sluice or pipeline 6 is connected with the ecological wetland outside the dike to introduce suitable seedlings into the wetland.

[0054] Those skilled in the art know that, in addition to implementing the system provided by the present application and each device, module, and unit thereof in the form of pure computer readable program code, the same functions can also be achieved by logically programming the method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system provided by the present application and each device, module, and unit thereof can be considered as a hardware component, and the devices, modules, and units included therein for achieving various functions can also be considered as structures within the hardware component. The devices, modules, and units for achieving various functions can also be considered as both software modules for implementing methods and structures within hardware components.

[0055] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A system for enhancing the effects of propagation release and nearshore ecological connectivity, characterized in that, The application relates to a high-density seedling cultivation area (2) for cultivating seedlings and discharging tail water, an ecological rice field area (1) for introducing received tail water into a rice field and discharging purified tail water, an ecological conservation area (3) for receiving purified tail water, regulating water level through an intelligent lifting dam (34) and temporarily storing and conserving purified water, and an off-dike wetland area (4) connected with the ecological conservation area (3) and used for providing a suitable and transitional place for seedlings before releasing. The high-density seedling cultivation area (2) is connected with the ecological rice field area (1) through a sluice or a pipeline (6), the individual specifications of seedlings are regularly sampled, and when the preset value-added releasing standard is met, the seedlings are introduced into the ecological rice field area (1) through the sluice or the pipeline (6). The ecological rice field area (1) is connected with the ecological conservation area (3) through a diversion ridge (11), water flows into the rice field in a baffle way, and the water flow is regulated through arranged soil ridges and field ridges to ensure that the water flow stays in the rice field for a preset time. An ecological floating island (31) is arranged in the ecological conservation area (3) to cultivate crops, tail water in the rice field is introduced through the sluice or the pipeline (6), the tail water is purified and then introduced into the high-density seedling cultivation area (2) through a water pump (7) to complete water circulation. The water level of the ecological conservation area (3) is controlled through the intelligent lifting dam (34), and the ecological wetland outside the dike is connected through the sluice or the pipeline (6).

2. The system for enhancing recruitment spillover effects and nearshore ecological connectivity according to claim 1, characterized in that, The off-dike wetland area (4) comprises salt gradient water bodies with salt contents from low to high and a tidal ditch structure.

3. The system for enhancing recruitment spillover effects and nearshore ecological connectivity of claim 1, wherein, The application further comprises the following steps:

4. The system for enhancing recruitment spillover effects and nearshore ecological connectivity of claim 1, wherein, S1, introducing seedlings into the high-density seedling cultivation area (2) for cultivation, and discharging seedling tail water into the ecological rice field area (1); 5. The system for enhancing recruitment spillover effects and nearshore ecological connectivity according to claim 4, wherein, S2, making the ecological rice field area (1) receive the seedling tail water and irrigate the rice field, and discharging rice field tail water into the ecological conservation area (3); 6. The system for enhancing recruitment spillover effects and nearshore ecological connectivity of claim 4, wherein, S3, making the ecological conservation area (3) receive the rice field tail water, regulating the water level through the intelligent lifting dam (34), and conserving clean water and returning the clean water to the high-density seedling cultivation area (2) through the water pump (7).

7. A method for enhancing the effect of stocking and nearshore ecological connectivity using the system for enhancing the effect of stocking and nearshore ecological connectivity according to any one of claims 1 to 6, characterized in that, The application further comprises the following steps: S4, if the seedlings grow to meet the preset value-added releasing standard, introducing the seedlings into the ecological wetland area outside the intelligent lifting dam (34) through the sluice or the pipeline (6), and sending the seedlings adapted to the environment into the nearshore natural water area (8). The seedlings are gradually adapted to different salinity and water body environments in the high-density seedling cultivation area (2), the ecological rice field area (1), the ecological conservation area (3) and the off-dike wetland area (4) to complete phased transition. ​ 8. The method for enhancing recruitment release effects and nearshore ecological connectivity according to claim 7, characterized in that, ​ ​ 9. The method for enhancing recruitment stocking effects and nearshore ecological connectivity of claim 7, wherein, ​

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