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Urban river benign ecosystem construction method

An ecosystem and construction method technology, applied in chemical instruments and methods, biological water/sewage treatment, polluted waterways/lakes/ponds/rivers treatment, etc., can solve problems that are not conducive to community diversity, accelerate swamps, release Large and other problems, to achieve the effect of ensuring the diversity of community structure and poor system stability

Active Publication Date: 2021-12-31
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion of the crown of submerged plants increases the canopy density of the community, which is not conducive to the formation of community diversity
At the same time, the excessive growth of submerged plants will also have serious consequences, such as the reduction of dissolved oxygen, the release of a large amount of nutrient salts, and the acceleration of swamping, etc.

Method used

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  • Urban river benign ecosystem construction method
  • Urban river benign ecosystem construction method
  • Urban river benign ecosystem construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The application area of ​​the selected urban river benign ecosystem construction method is the Duantouzhibang river in a certain city, and the river has completed the source control and sewage interception work. The length of the river is about 500m, the width of the river is 4-6m, the average water depth is about 1.8m, the water transparency is 0.3-0.5m, and the area of ​​the river is 2500 square meters.

[0033] The method for constructing benign ecosystems of urban river courses is carried out according to the following steps:

[0034] (1) Select the submerged plant Shuishidunya, which has a low light compensation point, good purification effect, strong pollution resistance, high ornamental value and will not cause biological invasion disasters, as the pioneer species. The planting density is about 20 plants / m 2 ;

[0035] The shallow water area is covered with yellow mud cuttings to plant the submerged plant Water Shield Grass, and the square ( figure 1 ) for imm...

Embodiment 2

[0043] The application area of ​​the selected urban river benign ecosystem construction method is the Duantouzhibang river in a certain city, and the river has completed the source control and sewage interception work. The length of the river is about 450m, the width of the river is 3-5m, the average water depth is about 1.6m, the water transparency is 0.5m, and the area of ​​the river is 1800 square meters. Planting and breeding area arrangements such as image 3 shown.

[0044] The method for constructing benign ecosystems of urban river courses is carried out according to the following steps:

[0045] (1) Select the water shield grass with low light compensation point, good purification effect, strong pollution resistance, high landscape ornamental value and will not cause biological invasion disaster as the pioneer species, and the planting density is 10 plants / m 2 ;

[0046] The shallow water area is covered with yellow mud cuttings to plant the submerged plant Water S...

Embodiment 3

[0054] Embodiment 3 is identical with embodiment 1 method, and difference is: step (1) adopts hornwort as pioneer species, and planting density is 10 strains / m 2 ; In the shallow water area covered with black mud cuttings to plant submerged plants hornwort, the ecological hanging bed can be raised or lowered or fixed in depth, the size of the hanging bed is 0.5m×0.5m, the planting platform of the ecological hanging bed is a Φ5cm steel support skeleton, and the surface mud thickness is 3cm , the top of the hanging bed is 80cm away from the water surface;

[0055] Step (2) Plant water lilies, water lilies, water chestnuts, and duckweed floating leaf plants in shallow water areas with a water depth of 50 to 100 cm, and the planting density is: 1 head of water lilies / m 2 , Nymphaeum 10 plants / m 2 , 2 rhizomes / m 2 , 2 heads / m 2 ;In waters with deeper water depth, "hanging tanks" are used to plant to promote their colonization. The underwater "hanging tanks" fixed on the river be...

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Abstract

The invention discloses an urban river benign ecosystem construction method. The method mainly comprises three stages: an aquatic plant restoration stage, an ecosystem construction stage and an ecological regulation and control stage, wherein the aquatic plant recovery aims at a single community formed by planting pioneer species, and the abundance index and the diversity index of submerged plant communities are improved by replanting different types of submerged plants through interferences of forest windows; the ecological system is constructed and perfected, a food network chain with a reasonable structure needs to be constructed, and the construction mainly comprises throwing of zooplanktons, benthonic animals and fishes; and bidirectional feedback coordination of the biocenosis and the water body environment is formed by comprehensively improving the composition of the biocenosis, so that the purposes of reconstructing a healthy water ecosystem and realizing water environment treatment and water ecology restoration are achieved. After the ecological system is stabilized, the overall vegetation coverage rate exceeds 40%, the transparency is stably maintained to be 0.80 m or above, the water quality of a river channel is clear, fishes fly and shallow, and the landscape effect of the water surface is good.

Description

technical field [0001] The invention belongs to the field of water body pollution restoration, and in particular relates to a method for constructing a benign ecological system of an urban river course. Background technique [0002] Urban river is a flowing and relatively open complex ecosystem in the urban landscape that is closely connected with the living environment of urban residents. In recent years, with the acceleration of urbanization and industrialization, urban life and industrial pollution have caused urban rivers to absorb too many nutrients such as nitrogen and phosphorus, causing serious eutrophication in urban rivers, and water bodies have gradually lost their ability to purify themselves. Water ecology The balance is severely disrupted. The use of aquatic plants for water purification is a common and effective method. Aquatic plants can curb the release of sediment nutrients, inhibit the growth of algae, and reduce the load of nutrients through direct abso...

Claims

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Application Information

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IPC IPC(8): C02F3/32
CPCC02F3/327C02F2103/007Y02W10/10
Inventor 李启蒙王国祥张新厚韩睿明刘金娥陈焱山许晓光陈赟
Owner NANJING NORMAL UNIVERSITY
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