Method for restoring large water-body breeding-base aquatic vegetation

A technology of aquatic vegetation and restoration method, applied in the field of ecological protection of lake water bodies, can solve the problems of difficulty in restoring aquatic vegetation and the failure of water quality to improve significantly, and achieve the effect of strong pertinence, obvious effect and low investment.

Active Publication Date: 2012-01-18
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method to eliminate waves and control herbivorous fish grazing by enclosing nets in order to overcome the difficulties in the recovery of aquatic vegetation in existing lake aquatic vegetation restoration methods, and to construct a small aquatic vegetation restoration system. environment, and then plant pioneer floating leaf plants and target submerged plants in order to form a stable community structure, improve the water environment, and restore aquatic ecosystems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The implementation site of this embodiment is East Taihu Lake, and the method for restoring aquatic vegetation in large-scale aquaculture sites includes the following steps:

[0022] 1. Net fence construction

[0023] The size of the net enclosure is 437m×263m, about 0.115km 2 . The net enclosure is mainly composed of wall nets, stone dragons, bamboo stakes, foot ropes, and foot piles. The wall net is the main body of the net, which is composed of an inner wall net and an outer wall net. The wall net is separated by 4 meters and is knitted with 9 strands of polyethylene wire, and the mesh is 2.5 cm. The stone dragon is the main body of the fixed wall net bottom line, which is composed of gravel or crushed stone wrapped in a net knitted with polyethylene thread. The stone dragon is 8 cm in diameter and weighs about 5 kilograms per meter. The knotted stone dragon is sewn with the bottom of the wall net. Put a foot pile on the stone dragon between each bamboo pile, and inser...

Embodiment 2

[0029] This embodiment is the same as embodiment 1, the difference lies in:

[0030] In the step 1, the distance between the inner and outer wall nets is 4.5 meters, the wall net mesh is 2.8 cm; the stone dragon has a diameter of 10 cm and weighs about 7.5 kg per meter. The diameter of the roots of the bamboo piles is 8 cm, the depth of the bottom mud is 0.9 meters, and the distance between the bamboo piles is 1.8 meters. The foot rope is a polyethylene rope of length (450 mm) x diameter (Φ3 mm), and the foot rope is inserted into the bottom mud at an angle of 40° C. with the water surface.

[0031] The stocking density in the step 2 is 100 mandarin fish, 1,000 yellow catfish and 100 red scorpionfish per hectare.

[0032] In the step 3, the fixed red water chestnut row spacing is 2.8 meters inserted in the bottom mud. Nymphaea planting spacing is 2.8 meters. Pioneer Floating Leaf Plants are planted to a depth of 5 meters along the inner net of the net fence. After binding 5 targe...

Embodiment 3

[0034] This embodiment is the same as embodiment 1, the difference lies in:

[0035] The distance between the inner and outer wall nets in step 1 is 5 meters, and the mesh of the wall net is 3 cm; the stone dragon has a diameter of 13 cm and weighs about 10 kg per meter. The diameter of the roots of the bamboo piles is 9 cm, and they are driven into the bottom mud to a depth of 1 meter. The distance between the bamboo piles is 2 meters. The foot rope is a polyethylene rope of length (50mm)×diameter (Φ3mm), and the foot rope is inserted into the bottom mud at an angle of 45°C with the water surface.

[0036] The stocking density in the step 2 is 120 mandarin fish, 1200 yellow catfish and 120 red scorpionfish per hectare.

[0037] In the step 3, the fixed red water chestnut rows are inserted into the bottom mud at a distance of 3 meters. Nymphaea planting spacing is 3 meters. Pioneer Floating Leaf Plants are planted to a depth of 6 meters along the inner net of the net fence. After...

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Abstract

The invention discloses a method for restoring large water-body breeding-base aquatic vegetation, which comprises the following steps of: establishing a net enclosure, removing herbivorous fishes at a net-enclosure area, introducing floating-leaved plants into the net enclosure, and subsequently planting submerged plants. Compared with the prior art, waves are dissipated and the grazing of the herbivorous fishes is controlled through the net enclosure in the method, the aquatic vegetation is constructed to restore a microenvironment, and pioneer floating-leaved plants and target submerged plants are then sequentially planted to form a stable community structure, so that the environment of a water body is improved, thereby an aquatic ecological system is restored.

Description

technical field [0001] The invention relates to an ecological protection method for a lake water body, in particular to a method for restoring aquatic vegetation in a large-scale water body breeding site. Background technique [0002] Lakes play an important role in regional flood regulation and storage, urban water supply, aquatic product enhancement, communication with shipping, and improvement of the ecological environment. With the continuous and rapid development of social economy and the rapid increase of population, the scale of lake surface resource development is expanding rapidly. At present, the development and utilization of water surface resources presents multiple phases and intensive deepening. Seine aquaculture is the main way of artificial utilization of water surface resources in the lake area. Due to the lack of reasonable norms and guidance, coupled with excessive aquaculture, seine aquaculture has caused the lake to face many ecological and environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 曾庆飞谷孝鸿胡维平
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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