Batch production process of marine substrate for bare spot repair area of seaweed bed
By sampling, screening, and mixing marine substrate in the bare seagrass bed remediation area, the problem of insufficient substrate source in the bare seagrass bed remediation area was solved, realizing the reconstruction of a suitable growth environment for seagrass beds and improving the survival rate and coverage of seagrass vegetation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- THE SECOND GEOLOGICAL BRIGADE OF HEBEI PROVINCIAL BUREAU OF GEOLOGY & MINERAL EXPLORATION & DEV (HEBEI PROVINCIAL MINING ENVIRONMENTAL RESTORATION & MANAGEMENT TECH CENT)
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-12
AI Technical Summary
The seagrass bed restoration area is no longer suitable for seagrass growth due to changes in substrate conditions and lack of effective marine substrate sources, resulting in the disruption of seagrass bed continuity.
Through steps such as sampling of marine matrix in the bare spot remediation area, particle analysis, screening and mixing of purchased soil, and testing, a marine matrix suitable for seagrass growth was prepared. Ecological woven bags were used to fill the matrix and keep it moist to ensure the uniformity and suitability of the matrix.
A marine substrate production process for bare seagrass bed remediation areas has been developed. Through the screening, mixing, and testing of purchased soil, a batch production process for marine substrate suitable for seagrass growth can be achieved. The screening and mixing of purchased soil solves the problem of the source of marine substrate for bare seagrass bed remediation areas, provides a suitable environment for seagrass growth, and improves the survival rate and coverage of seagrass vegetation.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of seagrass bed ecological restoration, specifically to a process for producing marine matrix in bare seagrass bed restoration areas. Background Technology
[0002] Seagrass beds are another important marine ecosystem besides mangroves and coral reefs, serving as habitats for many large marine organisms and even mammals. They possess high primary productivity and a strong carbon sequestration capacity. With the increasing intensity of marine development and utilization, global seagrass beds are rapidly declining, making the protection and restoration of seagrass bed ecosystems an urgent priority!
[0003] Factors affecting seagrass growth mainly include temperature, light, salinity, and marine matrix. Among these, natural environmental changes such as sustained high temperatures and continuous rainfall, especially human activities, have created numerous bare patch restoration zones on seagrass beds. These bare patch restoration zones consist of multiple nearly circular pits lacking matrix, indicating damage to the seagrass bed and severe disruption of its continuity.
[0004] Currently, our unit has completed the first domestic project on the backfilling of marine matrix in the restoration area of bare seagrass beds. Based on the project experience, we have proposed a marine matrix backfilling process for the restoration area of bare seagrass beds. This process is simple and easy to implement, with low operational requirements, and can effectively control the amount of suspended sediment. By adopting this backfilling process, a suitable matrix environment for seagrass growth can be provided for the restoration area of bare seagrass beds, which is of great significance for large-scale restoration of seagrass beds. Summary of the Invention
[0005] The main objective of this application is to provide a mass production process for marine substrate in the bare seagrass bed remediation area, in order to solve the problem that the bare seagrass bed remediation area is unsuitable for seagrass growth due to changes in substrate conditions.
[0006] A process for mass production of marine substrate for bare seagrass bed remediation areas includes the following steps:
[0007] S1: Marine matrix sampling and particle analysis experiment in the bare spot remediation area;
[0008] S2: Testing and Procurement of Externally Sourced Soil for Marine Substrate;
[0009] S3: Screening and mixing of purchased soil for marine substrates;
[0010] S4: Sampling and testing of the mixed marine matrix;
[0011] S5: Packaging and Storage.
[0012] In one possible implementation, during step S1, when sampling the marine matrix in the bare spot remediation area, three sediment columnar samples, each 70 cm vertically, are randomly taken from three locations 20 cm outward from the edge of the bare spot pit and sent to a qualified laboratory for testing. For particle size analysis, each columnar sample is cut into two segments: 0-30 cm and 30-70 cm. The samples are then sieved using sieving and moisture methods into four particle size groups: >2 mm, 2-0.075 mm, 0.075-0.005 mm, and <0.005 mm. This yields a statistical table of the sediment particle size distribution data from the bare spot pit.
[0013] In one possible implementation, in step S2, every 100m 3 Three samples are randomly taken from different parts of the proposed soil source, each weighing no less than 1.5 kg, and sent to a qualified laboratory for quality testing. If the test results meet the quality requirements of Class I marine sediments, the soil source can be purchased.
[0014] In one possible implementation, in step S3, the purchased soil source is subjected to three-stage screening, that is, it is screened according to the particle size of sand (2~0.075mm), silt (0.075~0.005mm), and clay (<0.005mm). The same soil source is screened repeatedly for each grade three times using a mesh screen method. Before screening, the imported soil should be turned over and dried mechanically to ensure that the natural moisture content of the soil source to be screened meets the mixing requirements.
[0015] In one possible implementation, in step S3, the mixture is prepared according to the volume ratio of sand (2-0.075mm), silt (0.075-0.005mm), and clay (<0.005mm) particle sizes in the sediment particle size distribution data analysis results of step 1. If the material does not meet the construction requirements, the missing particle size soil source should be purchased externally, and the missing particle size should be supplemented after repeating the screening step.
[0016] In one possible implementation, excavators and loaders are used in conjunction with mixing, per 1000m³ 3 The mixing time should be no less than 8 hours to ensure uniform mixing of the gradation. If unevenness is still found on site, the mixing time should be increased until uniform mixing is achieved.
[0017] In one possible implementation, in step S4, every 100m 3 Three samples were randomly taken from different parts of the mixed marine matrix, each weighing no less than 1.5 kg, and sent to a qualified laboratory for particle size analysis. The experimental results should be compared with the data in the statistical table of particle size distribution data analysis of the bare spot pit sediments. A deviation of less than 5% is considered acceptable. If there are discrepancies, steps S3 and S4 should be repeated until the requirements are met. Thus, the marine matrix required for the bare spot remediation area is obtained.
[0018] In one possible approach, the net bags used to fill the bare spot remediation area can be jute bags or eco-woven bags. The net bags should ensure that the substrate particles do not scatter. The net bags should be 70cm-100cm long and 50cm-80cm wide. After filling the bags, they should be sealed. The sealed substrate net bags should be transported to the bare spot remediation area for backfilling as soon as possible. The net bags should be protected from repeated handling and shaking, and should be kept moist by spraying seawater daily.
[0019] The beneficial effects of the mass production process for marine substrate provided by this invention are as follows: This process solves the problem of the lack of a source of marine substrate for the restoration of bare seagrass beds in China. By purchasing soil, screening, proportioning, mixing, and testing, a marine substrate suitable for seagrass growth can be obtained. This process is simple and easy to implement, has low operational requirements, and can be mass-produced. After being deployed, it can reconstruct a suitable marine substrate environment for seagrass growth in the restoration area of bare seagrass beds, making it possible for large-scale restoration of seagrass beds! Attached Figure Description
[0020] Figure 1 A flowchart illustrating the process steps for mass production of marine substrates;
[0021] Figure 2 Statistical table of analysis results of particle size distribution data of bare spot pit sediments;
[0022] Figure 3 Example: Comparison of seagrass growth before and after substrate placement in naked spot pits. Detailed Implementation
[0023] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0024] Please see Figure 1 The present invention describes a process for the mass production of marine substrate for the restoration of bare seagrass beds. The process includes the following steps:
[0025] S1: Marine matrix sampling and particle analysis experiment in the bare spot remediation area;
[0026] S2: Testing and Procurement of Externally Sourced Soil for Marine Substrate;
[0027] S3: Screening and mixing of purchased soil for marine substrates;
[0028] S4: Sampling and testing of the mixed marine matrix;
[0029] S5: Packaging and Storage.
[0030] In step S1, when sampling the marine matrix in the bare spot remediation area, three sediment columnar samples, each 70cm long, were randomly taken from three locations 20cm outward from the edge of the bare spot pit and sent to a qualified laboratory for testing. For particle size analysis, each columnar sample was cut into two segments: 0-30cm and 30-70cm. The samples were then sieved using sieving and moisture methods into four particle size groups: >2mm, 2~0.075mm, 0.075~0.005mm, and <0.005mm. This yielded a statistical table of the sediment particle size distribution data from the bare spot pit.
[0031] In step S2, every 100m 3 Three samples are randomly taken from different parts of the proposed soil source, each weighing no less than 1.5 kg, and sent to a qualified laboratory for quality testing. If the test results meet the quality requirements of Class I marine sediments, the soil source can be purchased.
[0032] In step S3, the imported soil is turned over and dried using a soil turner to ensure that the natural moisture content of the soil source to be screened meets the mixing requirements. The purchased soil source undergoes a three-stage screening process: sieving according to particle sizes of sand (2–0.075 mm), silt (0.075–0.005 mm), and clay (<0.005 mm) using mesh sieves with apertures of 2 mm, 0.075 mm, and 0.005 mm. Each gradation screening of the same soil source is repeated three times. Before screening, the imported soil should be mechanically turned over and dried to ensure that the natural moisture content of the soil source to be screened meets the mixing requirements.
[0033] In step S3, the volume ratio of sand (2-0.075mm), silt (0.075-0.005mm), and clay (<0.005mm) particle sizes is used to mix the materials according to the sediment particle size distribution data analysis results in step 1. If the materials do not meet the construction requirements, the missing particle size soil source should be purchased externally, and the missing particle size should be supplemented after repeating the screening step.
[0034] Using excavators and loaders in conjunction with mixing, per 1000m³ 3 The mixing time should be no less than 8 hours to ensure uniform mixing of the gradation. If unevenness is still found on site, the mixing time should be increased until uniform mixing is achieved.
[0035] In step S4, every 100m 3 Three samples were randomly taken from different parts of the mixed marine matrix, each weighing no less than 1.5 kg, and sent to a qualified laboratory for particle size analysis. The experimental results should be compared with the data in the statistical table of particle size distribution data analysis of the bare spot pit sediments. A deviation of less than 5% is considered acceptable. If there are discrepancies, steps S3 and S4 should be repeated until the requirements are met. Thus, the marine matrix required for the bare spot remediation area is obtained.
[0036] Ecological woven bags can be used to fill the marine substrate required for the bare spot remediation area. The net bags should ensure that the substrate particles do not scatter. The net bags should be 70cm-100cm long and 50cm-80cm wide. After filling the bags, they should be sealed. The sealed substrate net bags should be transported to the bare spot remediation area for backfilling as soon as possible. The net bags should be protected from repeated handling and shaking, and seawater should be sprayed on them daily to keep them moist.
[0037] After deploying the marine substrate produced in this embodiment in the experimental sea area in 2022, seagrass was planted and transplanted on the spot. The observation results in 2023 showed that the survival rate of seagrass vegetation in this area increased from 0-5% to ≥20%, the seagrass area in sparse areas increased by ≥5%, and the coverage in bare spot areas increased by ≥20%.
[0038] The beneficial effects of the mass production process of marine substrate provided by this invention are as follows: This process solves the problem of the lack of a source of marine substrate for the restoration of bare seagrass beds in China. By purchasing soil, screening, proportioning, mixing, and testing, a marine substrate suitable for seagrass growth can be obtained. This process is simple and easy to implement, has low operation requirements, and can be mass-produced. After being deployed, it can reconstruct the marine substrate environment of the bare seagrass bed restoration area, providing the possibility for large-scale restoration of seagrass beds.
Claims
1. A process for mass production of marine substrate for bare-spot remediation of seagrass beds, characterized in that, The process includes the following steps: S1: Marine matrix sampling and particle analysis experiment in the bare spot remediation area; S2: Testing and Procurement of Externally Sourced Soil for Marine Substrate; S3: Screening and mixing of purchased soil for marine substrates; S4: Sampling and testing of the mixed marine matrix; S5: Packaging and Storage; The marine matrix sampling and particle analysis experiment described in step S1 requires taking one 70cm vertical sediment column sample from three random locations 20cm outward from the edge of the bare spot pit and sending them to a qualified laboratory for testing. During the particle analysis experiment, each column sample is cut into two segments, 0-30cm and 30-70cm. The samples are then sieved into four particle size groups: >2mm, 2~0.075mm, 0.075~0.005mm, and <0.005mm, using sieving and moisture methods. A statistical table of the particle size distribution data analysis results of the bare spot pit sediments is obtained. If the test results of the purchased soil source described in step S2 meet the quality requirements of Class I marine sediments, it shall be used as the purchased soil source for procurement. The purchased soil screening mentioned in step S3 refers to the three-stage screening of the purchased soil, namely screening according to the particle size of sand (2~0.075mm), silt (0.075~0.005mm), and clay (<0.005mm); Step S3, mixing of purchased soil, should be carried out according to the volume ratio of sand (2-0.075mm), silt (0.075-0.005mm), and clay (<0.005mm) particle sizes in the sediment particle size distribution data analysis results of step S1. Step S4 describes the sampling and testing of the mixed marine matrix, requiring sampling every 100m. 3 Three samples were randomly taken from different parts of the mixed marine matrix, each weighing no less than 1.5 kg, and sent to a qualified laboratory for particle size analysis. The experimental results should be compared with the data in the statistical table of particle size distribution data analysis of bare spot sediments. If the deviation of each data is within 5%, it is considered qualified. Otherwise, repeat steps S3 and S4 until the requirements are met. Thus, the marine matrix required for the bare spot remediation area is obtained.
2. The mass production process of marine substrate for bare seagrass bed remediation areas according to claim 1, characterized in that, The marine matrix purchased soil source testing described in step S2 requires: per 100m 3 Three samples will be randomly taken from different parts of the soil source to be purchased, with each sample weighing no less than 1.5 kg, and sent to a qualified laboratory for quality testing.
3. The mass production process of marine substrate for bare seagrass bed remediation areas according to claim 1, characterized in that, The external soil source screening described in step S3 adopts the method of mesh screening. Each grade of the same soil source is screened repeatedly 3 times. Before screening, the imported soil should be turned over and dried mechanically to ensure that the natural moisture content of the soil source to be screened meets the mixing requirements.
4. The mass production process of marine substrate for bare seagrass bed remediation areas according to claim 1, characterized in that, If the purchased soil in step S3 is insufficient for the required construction quantity, the missing particle size soil should be purchased, and the sieving process should be repeated to select the missing particle size for supplementation. An excavator and loader should be used in conjunction with mixing, at a rate of 1000m³ / h. 3 The mixing time should be no less than 8 hours to ensure uniform mixing of the gradation. If unevenness is still found on site, the mixing time should be increased until uniform mixing is achieved.
5. The mass production process of marine matrix for bare seagrass bed remediation areas according to claim 1, characterized in that, In step S5, the bagging and storage of marine substrate required for the bare spot remediation area is carried out using eco-friendly woven bags. The bags should ensure that the substrate particles do not scatter. The length of the bags is 70cm to 100cm and the width is 50cm to 80cm. After filling the bags, they should be sealed. The sealed substrate bags should be transported to the bare spot remediation area for backfilling as soon as possible. The bags should be protected from repeated handling and shaking, and seawater should be sprayed on them daily to keep them moist.