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Ecological restoration method for submerged plants in lake of city

A technology for submerged plants and ecological restoration, which is applied in the fields of botany equipment and methods, plant protection, plant cultivation, etc. Effects of Diversity and Landscape Needs

Active Publication Date: 2018-11-23
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many ways to reduce lake wind and waves, such as cement row piles, T-shaped dam construction, and independent island construction. The investment in these projects is too large, and the buildings formed in the lake will be demolished after the ecological restoration is successful and the ecosystem is stable. There is also the use of enclosures and floating beds to dissipate waves, but the national research plan for Meiliang Bay in Taihu Lake shows that the effects of enclosures and floating beds are very weak, and it is difficult to achieve the purpose of restoring submerged plants.
[0006] Restoration of lake ecosystems in cities with strong winds and waves, changing the state of turbid water to clear water. The biggest limiting factor is the strong winds and waves and the difficulty in restoring submerged plants

Method used

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  • Ecological restoration method for submerged plants in lake of city
  • Ecological restoration method for submerged plants in lake of city
  • Ecological restoration method for submerged plants in lake of city

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 The impact of wind and waves and sediment on the growth of bitter grass

[0024] The experiment was conducted in an outdoor pond near East Taihu Lake from July 29 to August 26, 2013. There are two experimental factors, factor one: simulate the intensity of wind and wave disturbance in Taihu Lake, 3W wave pump (flow rate 0.4m / s), 6W wave pump (flow rate 0.8m / s). Factor 2: sediment after dredging (low water content of bottom mud); undredded sediment (high water content of bottom mud). Four treatments were designed in the experiment: low wind wave disturbance + dredged sediment, low wind wave disturbance + undredded sediment, high wind wave disturbance + dredged sediment, high wind wave disturbance + undredded sediment, 4 parallels for each treatment , 16 barrels in total. The two kinds of sediments (matrix) used in the experiment come from Meiliang Bay, Taihu Lake, one is dredged sediment and the other is undredged sediment. The sediment is used after bein...

Embodiment 2

[0027] Embodiment 2 Taking a city lake in Zhengzhou as an example, the effect of adopting the method of the present invention to ecologically restore submerged plants in a city lake with relatively high wind and waves is illustrated.

[0028] The water area of ​​the target lake is 950,000 square meters, the water depth is 2 meters, and the transparency is 30cm.

[0029] Ecological restoration began in March 2014, and dredging and fish removal are being carried out;

[0030] In June of the same year, polyethylene mesh was used to divide the lake into nine sub-waters of about 100,000 square meters. The polyethylene mesh was 1 cm. Each sub-water was separated by 5 layers of mesh, and the distance between each mesh was 100 cm. After the omentum is laid out, the overall reduction of wind and waves is about 50%, and the transparency is increased to 75cm.

[0031] In early July, the water quality and lake flow indicators of each sub-water area, as well as the water content in the se...

Embodiment 3

[0043] Embodiment 3 Taking a city lake in Changsha as an example, the effect of adopting the method of the present invention to ecologically restore submerged plants in a city lake with relatively high wind and waves is illustrated.

[0044] The water area of ​​the target lake is 310,000 square meters, the water depth is 2.5 meters, and the transparency is 40cm.

[0045] Ecological restoration began in April 2014, and dredging and fish removal are being carried out;

[0046] In June of the same year, the lake was divided into 6 sub-water areas of about 50,000 square meters by using polyethylene mesh. The polyethylene mesh is 3cm. Each sub-water area is separated by 10 layers of mesh, and the distance between each mesh is 500cm. After the omentum is laid out, the overall reduction of wind and waves is about 60%, and the transparency is increased to 80cm.

[0047] In early July, the water quality and lake flow indicators of each sub-water area, as well as the water content in the...

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Abstract

The invention provides an ecological restoration method for submerged plants in a lake of a city. The method includes the steps that the target lake is selected; estimation is performed in reference to the stress of the submerged plants in the lake; the environment and sediment of the target lake are investigated and analyzed, and the target lake is divided into regions; the restored types of thesubmerged plants in the target lake are obtained. The problem that the submerged plants in the lake of the city are difficult to restore because of existing wind waves and other factors is solved. Byperforming the procedures of stress estimation of the submerged plants, scientific region division of the target lake and others, the submerged plants in the lake of the city are restored. The methodhas the advantages of being safe, simple, feasible, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an ecological recovery method for submerged plants in urban lakes. Background technique [0002] The restoration of submerged vegetation is the core link of ecosystem restoration, and it is also the key to realize the transition from turbid water state to clear water state. At present, there are many successful cases of ecological restoration of small urban landscape lakes in China. After the dominance of submerged plants, the lake has changed from a turbid water state to a clear water state that everyone loves. The water quality is clear and full of vitality. However, there are few reports on successful ecological restoration of urban lakes with strong wind and waves. [0003] Small lakes are shallow, less affected by wind, and have shallow and sheltered morphological characteristics. The phenomenon of resuspension caused by wind waves and increased turbidity r...

Claims

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Application Information

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IPC IPC(8): A01G33/00A01G22/00A01G13/00C02F3/32
CPCA01G13/00A01G33/00A01G22/00C02F3/32
Inventor 李宽意利翔燕黄晓峰钱仁勇
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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