Method for controlling filamentous cyanobacterial bloom

Abstract

The invention discloses a method for controlling filamentous cyanobacterial bloom, and belongs to the field of natural ecological application. The method for controlling the filamentous cyanobacterial bloom comprises the following steps: uniformly planting and fixing garlic on a foam floating bed in a matrix according to a certain density, then placing the garlic on the surface of a water body where the filamentous cyanobacterial bloom gathers, enabling the garlic to float on the water body, and enabling garlic roots to go deep into the water body, the garlic releases substances for inhibiting the filamentous cyanobacteria while growing, so that the aim of controlling the filamentous cyanobacteria bloom is fulfilled. According to the method for controlling filamentous cyanobacteria bloom, the removal rate of filamentous cyanobacteria can reach 95% or above, and the method can be used for controlling filamentous cyanobacteria bloom in natural water.

Description

Technical Field

[0001] The invention relates to a method for controlling filamentous cyanobacteria blooms, and belongs to the field of natural ecological applications. Background Art

[0002] With the rapid economic development, the generation and discharge of a large number of pollutants have led to the increasing eutrophication of many natural water bodies, including ponds, rivers, lakes and reservoirs. Due to eutrophication, many lakes, reservoirs, ponds and rivers have erupted in filamentous cyanobacteria blooms. A large number of filamentous cyanobacteria floating on the water surface or suspended in the water body will significantly reduce the transparency of the water body, seriously hinder the absorption and utilization of light by other phytoplankton, reduce the intensity of photosynthesis in the water environment as a whole, cause a lack of oxygen content, and lead to the death of farmed animals in the pond; at the same time, some filamentous cyanobacteria will release algae toxins, which have potential impacts on aquatic organisms and human health, thus causing a major impact on people's social life and production.

[0003] At present, the methods for preventing and controlling filamentous cyanobacteria blooms mainly include physical methods, chemical methods and biological methods. Physical methods include salvage (mechanical salvage and manual salvage), flocculation sedimentation method, water exchange method, high-pressure algaecide method, ultraviolet algaecide method and ultrasonic algaecide method. These methods consume a lot of manpower, material resources and financial resources, and only treat the symptoms but not the root cause. The effect lasts for a short time, and filamentous cyanobacteria blooms are prone to break out again. Chemical methods include chemical algaecide method and oxidant algaecide method. Chemical algaecide has high efficiency, but it brings secondary pollution problems, such as copper sulfate; while the oxidant algaecide method using oxidants such as hydrogen peroxide is not effective for high concentrations of wild filamentous cyanobacteria. Biological methods include microbial method, plant allelopathy method, zooplankton feeding method, benthic animal feeding method, and fish feeding method. Biological methods generally have long cycles, are greatly affected by environmental factors, and are uncontrollable. Therefore, it is urgent to find a method that is easy to operate, green and safe, and can effectively control filamentous cyanobacteria blooms.

[0004] At present, the prior art, such as CN11351171 B - a method for emergency treatment of blue algae blooms, and CN117326648A - a method for controlling blue algae blooms in fish ponds, discloses the use of garlic juice to inhibit blue algae blooms. However, these methods actually cause the water body to emit a strong garlic odor, and the operation is not simple. Each time the blue algae treatment is carried out, a large amount of garlic juice needs to be squeezed. In addition, the ingredients in garlic juice are complex, and there may be only a few ingredients that are useful for algae inhibition, so the utilization rate of garlic in the methods of the aforementioned patents needs to be improved.

[0005] In some other existing technologies, such as "The Significance and Prospect of Allelopathy in Red Tide Control", "The Antibacterial Effect of Garlic Extract and Root Secretions on Three Soil-borne Pathogens" and "The Allelopathic Effect of Garlic Root Secretions", they only mention the effects of some crude garlic extracts or the bactericidal effects of garlic root secretions. However, filamentous cyanobacteria are different from bacteria. Filamentous cyanobacteria can photosynthesize, are larger, and have more complex cell structures, while bacteria cannot photosynthesize, are smaller, and have simpler structures. Therefore, most of the existing research stays on the inhibition of garlic extracts on bacteria, and has not deeply explored the effects of garlic root secretions on filamentous cyanobacteria. Summary of the invention

[0006] [Technical issues]

[0007] At present, the methods for controlling filamentous cyanobacteria blooms include physical methods such as salvage, flocculation and sedimentation, water exchange, high pressure algae killing, ultraviolet algae killing and ultrasonic algae killing, chemical methods including chemical algae killing and oxidant algae killing, and biological methods including microbial methods, plant allelopathy, zooplankton feeding, benthic animal feeding, and fish feeding. However, physical methods are costly, time-consuming and labor-intensive, with short-lasting effects, and filamentous cyanobacteria blooms are prone to re-eruption; chemical methods are prone to secondary pollution; biological methods have a long cycle, are easily affected by the environment, and the overall process is uncontrollable. Therefore, there is an urgent need to find a method that is easy to operate, green and safe, and can effectively control filamentous cyanobacteria blooms.

[0008] [Technical solution]

[0009] In order to solve the above problems, the present invention provides a method for controlling filamentous cyanobacteria blooms, which comprises planting garlic in a uniform matrix at a certain density and fixing it on a foam floating bed, and then placing it on the surface of a water body where the filamentous cyanobacteria blooms gather, so that the garlic itself floats on the water body, while the garlic roots penetrate deep into the water body, and the garlic releases substances that inhibit the filamentous cyanobacteria while growing, thereby achieving the effect of long-term control of the filamentous cyanobacteria.

[0010] The present invention provides a method for controlling filamentous cyanobacteria blooms, comprising the following steps:

[0011] Garlic is planted on a floating device at a certain density, and then the floating device planted with garlic is placed on the water body so that the roots of the garlic are submerged in the water body. While ensuring the growth of the garlic, the roots of the garlic secrete substances to inhibit filamentous cyanobacteria.

[0012] Furthermore, the garlic includes garlic cloves that have grown roots and sprouted, or garlic cloves that have grown roots and have not sprouted, or living garlic plants.

[0013] Furthermore, the floating device is a device with a certain buoyancy and capable of floating on the water surface.

[0014] Furthermore, the floating device includes an aquatic planting floating bed and an artificial ecological floating bed.

[0015] Furthermore, the material of the floating device includes plastic, foam or rubber.

[0016] Furthermore, the floating device is provided with holes for placing garlic.

[0017] Furthermore, ensuring the growth of garlic means that only the root of the garlic is submerged in the water body, or the part above the root together with the root is submerged in the water body without hindering the survival and growth of the garlic.

[0018] Furthermore, the water body includes a lake, a reservoir, a river or a pond.

[0019] Furthermore, the density of garlic and the density of filamentous cyanobacteria in the water body are in the range of 0.25 to 4 kg / m 2 :0.2~3×10 6 cells / liter.

[0020] Preferably, the density of garlic and the density of filamentous cyanobacteria in the water body are in a ratio of 0.5 to 4 kg / m 2 :0.2~3×10 6 cells / liter.

[0021] More preferably, the density of garlic and the density of filamentous cyanobacteria in the water body are in a ratio of 1 to 4 kg / m 2 :0.2~3×10 6 cells / liter.

[0022] Specifically, the density of garlic and the density of filamentous cyanobacteria in the water body are 2 to 4 kg / m 2 :0.2~3×10 6 cells / liter.

[0023] Furthermore, when living garlic plants are used to carry out the above method, the density of garlic is calculated based on the root mass of the living garlic plants.

[0024] Furthermore, the filamentous cyanobacteria include Oscillatoria, Spirulina, Longispora, Anabaena, Aphanizomenon, Anabaena, Pseudo-cylindrical spores, and Lactospira.

[0025] The invention also provides application of garlic root secretions in controlling filamentous cyanobacteria blooms.

[0026] Furthermore, the garlic root exudates are substances secreted by the roots of garlic cloves or garlic plants during their growth.

[0027] Furthermore, the application refers to planting garlic plants or garlic cloves at a certain density on the water surface using a floating device.

[0028] Furthermore, the filamentous cyanobacteria include Oscillatoria, Spirulina, Longispora, Anabaena, Aphanizomenon, Anabaena, Pseudo-cylindrical spores, and Lactospira.

[0029] [Beneficial Effects]

[0030] The operation is simple, the cost is low, the effect is excellent and sustainable: the method of controlling the bloom of filamentous cyanobacteria by using garlic is extremely simple to operate. It only requires planting garlic cloves in a floating bed, and then waiting for the garlic to automatically secrete substances that inhibit the bloom of filamentous cyanobacteria to achieve purification of the water environment; at the same time, the subsequent garlic cloves treated by the method can continue to be planted in the soil to generate economic benefits. The whole process is free of waste and no harmful substances are generated. The cost is very low, green and safe, and in line with the concept of sustainable development; finally, the method can achieve the effect of efficiently killing filamentous cyanobacteria, and the growth rate of filamentous cyanobacteria is less than -95.00%, effectively controlling the outbreak of filamentous cyanobacteria blooms. DETAILED DESCRIPTION

[0031] The following is a description of the preferred embodiments of the present invention. It should be understood that the embodiments are intended to better explain the present invention and are not intended to limit the present invention. The method for determining the density of filamentous cyanobacteria in the embodiments is based on Zhang Zongshe and Huang Xiangfei's "Research Methods for Freshwater Plankton"; the reagents or other materials used in the present invention are all commercially available unless otherwise specified.

[0032] Example 1

[0033] A method for controlling filamentous cyanobacteria blooms comprises the following steps:

[0034] Garlic was planted uniformly in a certain density matrix on a foam floating bed and then placed on the surface of a pool with filamentous cyanobacteria blooms (the area of ​​a pool in Wuxi was 25m 2 (5m long × 5m wide), water depth 2m), while the garlic grows, it releases substances that inhibit filamentous cyanobacteria, thereby controlling the bloom of filamentous cyanobacteria. The whole process takes 15 days.

[0035] The density of garlic is 0, 0.25, 0.5, 1, 2, 4 kg / m 2 The algae density in the filamentous cyanobacteria bloom is 0.2×10 6 cells / liter.

[0036] Comparative Example 1

[0037] In the same area, the selected area is 25m 2The invention relates to a water pool (5 m long × 5 m wide) with a water depth of 2 m. The garlic described in Example 1 is omitted, and the others are the same as those in Example 1.

[0038] After the entire treatment process was completed, the density of filamentous cyanobacteria in the water body was tested on the 15th day. The test results are shown in Table 1:

[0039] From Table 1, it can be seen that after the garlic was omitted in the control example 1, the number of filamentous cyanobacteria in the control group on the 15th day was significantly higher than that in the experimental group. Therefore, if the removal rate of filamentous cyanobacteria is 95%, and considering the effect and cost, the appropriate garlic density range for treating filamentous cyanobacteria blooms is 0.5-4kg / m 2 .

[0040] Table 1 Comparison of the effects of different garlic densities on controlling filamentous cyanobacteria

[0041]

[0042] Example 2

[0043] A method for controlling filamentous cyanobacteria blooms comprises the following steps:

[0044] Garlic was evenly distributed in a matrix at a certain density and fixed on the foam floating bed, and then placed on the surface of the pool where filamentous cyanobacteria blooms gathered (the area of ​​a pool in Wuxi was 25m 2 (5m long × 5m wide), water depth 2m), while the garlic grows, it releases substances that inhibit filamentous cyanobacteria, thereby controlling the bloom of filamentous cyanobacteria. The whole process takes 15 days.

[0045] Wherein, described garlic density is 4kg / m 2 The density of filamentous cyanobacteria in the filamentous cyanobacteria bloom is in the range of 0.375×10 6 cells / L, 0.75×10 6 cells / L, 1.5×10 6 cells / L, 3.0×10 6 cells / L, 6.0×10 6 cells / liter.

[0046] After the entire treatment process was completed, the density of filamentous cyanobacteria in the water was tested. The test results are shown in Table 2:

[0047] It can be seen from Table 2 that if the removal rate of filamentous cyanobacteria is 95%, and considering the effect and cost, the initial density of filamentous cyanobacteria for treating filamentous cyanobacteria blooms ranges from 0.375 to 3×10 6 cells / liter.

[0048] Table 2 Comparison of algae control effects at different initial filamentous cyanobacteria densities

[0049]

[0050] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A method for controlling filamentous cyanobacteria blooms, characterized in that: The steps include: Garlic is planted on a floating device at a certain density, and then the floating device planted with garlic is placed on the water body so that the roots of garlic are submerged in the water body. While ensuring the growth of garlic, the roots of garlic secrete substances to inhibit filamentous cyanobacteria; The ratio of the density of garlic to the density of filamentous cyanobacteria in the water is 0.25-4 kg / m 2 :0.2~3×10 6 cells / liter.

2. The method according to claim 1, characterized in that The garlic includes garlic cloves that have grown roots and sprouted, or garlic cloves that have grown roots and have not sprouted, or living garlic plants.

3. The method according to claim 1, characterized in that The floating device is a device with a certain buoyancy and capable of floating on the water surface.

4. The method according to claim 1, characterized in that The material of the floating device includes plastic, foam or rubber; holes are distributed on the floating device for placing garlic.

5. The method according to claim 1, characterized in that The water body includes lakes, reservoirs, rivers or ponds.

6. The method according to claim 1, characterized in that The density ratio of the garlic to the density of the filamentous blue algae in the water body is 0.5-4 kg / m 2 :0.2~3×10 6 cells / liter.

7. The method according to claim 1, characterized in that The density of the garlic and the density of the filamentous blue algae in the water body are in a ratio of 1 to 4 kg / m 2 :0.2~3×10 6 cells / liter.

8. The method according to any one of claims 1 to 7, characterized in that: When living garlic plants are used, the density of garlic is calculated based on the root mass of the living garlic plants.

9. An application of garlic root secretions for controlling filamentous cyanobacteria blooms, characterized in that: The garlic root exudates are substances secreted by the roots of garlic cloves or garlic plants when they grow.

10. The use according to claim 9, characterized in that The filamentous cyanobacteria include Oscillatoria, Spirulina, Longispora, Anabaena, Aphanizomenon, Anabaena, Pseudocylarionella, and Lactospira.

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