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A method of synergistically promoting the growth of submerged plants by using fish and benthic animals

A technology for submerged plants and benthic animals, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the failure of lake ecological restoration, eliminate the negative effects of filamentous algae, and difficult Ingesting Spirogyra and other problems to achieve enhanced water purification effect, long-lasting effect, and health protection effect

Active Publication Date: 2021-01-12
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the absence of effective control measures, filamentous algae will grow in large quantities, forming considerable biomass and coverage ( figure 1 ), thereby weakening the intensity of underwater light, which will inhibit the acquisition of light by submerged plants, causing submerged plants to die again, leading to the failure of lake ecological restoration
Existing studies have found that snails (mainly snails and turnip snails) and some invertebrates (such as chironomid larvae) can eat algae attached to the surface of plant leaves, but it is difficult to eat filamentous algae such as Spirogyra
Therefore, in some lake ecological restoration projects at home and abroad, snails are used as the main means to control the biomass of algae attached to the surface of plant leaves, but it is difficult to control the development of Spirogyra populations.
In addition, these snails and invertebrates are also the main food for some fish (carp, crucian carp and other benthic omnivorous fish), so it is difficult for snails to form large populations and Therefore, it is difficult to eliminate the negative effect of filamentous algae on plant growth through snails, which has also been verified in some domestic ecological restoration practices ( figure 1 )

Method used

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  • A method of synergistically promoting the growth of submerged plants by using fish and benthic animals
  • A method of synergistically promoting the growth of submerged plants by using fish and benthic animals
  • A method of synergistically promoting the growth of submerged plants by using fish and benthic animals

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 The method of synergistically promoting the growth of Erythrina chinensis and Anodonta dorsalis

[0028] A. Test system construction: In a polyethylene plastic bucket with a volume of 100 L, hold 10 cm of lake mud filtered through a steel wire mesh with a mesh size of 0.5 cm, and then put lake water to a distance of 10 cm from the mouth of the bucket. A total of 24 buckets are needed, and 6 treatment groups are set up, which are the control group, the mussel group, 2 fish density groups (1 and 3 fish) and 2 fish-mussel composite groups (mussels+1 Snakefish and mussels +3 Snakefish), and each treatment group had 4 replicates.

[0029] B. Planting bitter grass: choose bitter grass with the same size, cut off the old leaves withered at the end of bitter grass leaves, and set aside. The average length of the leaves of Erythrina fragrans was 21 cm, and the average biomass per plant was 4.5 g. 10 plants of bitter grass were planted in each test bucket, and the pla...

Embodiment 2

[0037] In the pond planted with bitter grass, put 130g / only mussels, and the stocking density is 2 / m 2 20 days after putting in the river mussels, put in the fry of the big fin carp in the pond, the body length of the big fin carp is 8-10cm, the weight is 5-6g / tail, and the stocking density is 2 fish / m 2 .

Embodiment 3

[0039] In the lakes planted with bitter grass, put 140g / only mussels, and the stocking density is 2 / m 2 , when putting in the river mussels for 30 days, put in the larvae fry in the pond, the body length of the larvae is 9cm, the body weight is 8g / tail, and the stocking density is 3 fish / m 2 .

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Abstract

The invention relates to a method for promoting submerged plant growth with fish and benthonic animals cooperatively, and the method can be applied to the field of eutrophic water ecological restoration. The method is realized by enhancing the illumination acquisition approach of submerged plants, and includes: putting freshwater mussels into a water area in which a submerged plant community structure is constructed for ecological restoration; 1 month later after putting of the freshwater mussels, stocking Rhodeus for cooperation of fish and freshwater mussels, thus reaching the effect of increasing the submerged plant growth rate, and guaranteeing healthy and stable development of submerged plant communities. On the basis of integrating the existing biological water purification technologies, through stocking of fish and filter-feeding benthonic animals in the system, the method provided by the invention utilizes the cooperative effect of fish and filter-feeding benthonic animals to promote submerged plant growth and reproduction rate, is conducive to rapid field planting of submerged plants and stable development of community structure, thereby maintaining the long-term operation of the clear water state system.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a method for promoting the growth of submerged plants by utilizing the fish-filter-feeding benthos synergy. Background technique [0002] With the development of human society, the impact of human activities on freshwater ecosystems is becoming more and more serious, among which the problem of eutrophication is particularly prominent. Eutrophication of water body is one of the water environment problems widely concerned by countries all over the world, which seriously affects the structure and function of water ecosystem. The problem of eutrophication in my country's water bodies is very serious. According to 2007-2010, 138 water bodies with an area greater than 10 km 2 According to the survey on eutrophication level of lakes in China, 85.4% of the lakes exceeded the eutrophication standard ( TSI index). The problem of eutrophication in Europe and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
CPCC02F3/327
Inventor 于谨磊刘正文关保华陈非洲
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY