Composite fish reef system for controlling aquatic plant coverage areas of plant-type lakes and construction method

Abstract

The invention relates to a composite fish reef system for controlling the aquatic plant coverage areas of grass-type lakes. The system comprises fish reefs and shallow grass-type lakes; the fish reefsare provided with multiple layers of artificial fish reef plates with the areas gradually increased from top to bottom, and timber piles are adopted between the artificial fish reef plates for supporting and fixing to form a whole; the fish reefs sink to the bottom of the shallow grass-type lakes through distribution and cover sinking aquatic plants on the corresponding parts in the shallow grass-type lakes, the aquatic plants on the parts cannot grow, and the phenomenon that due to excessive aquatic plants, the ecological environment deteriorates is prevented. Accordingly, the facilities andtechnology are simple, and the aquatic plant coverage areas of the grass-type lakes can be effectively reduced; suitable living and breeding places are provided for fish, and the fish population structure is restored; the fish reefs made from environmental protection materials with high porosity and high air-permeability and the timber piles are good in environmental protection, free of pollutionto a water body and capable of being degraded automatically over a long time, and the problems that artificial fish reefs made from traditional building materials block an ecological chain of a lakebottom water-soil interface are effectively solved.

Description

technical field [0001] The invention relates to a grass-type lake ecological restoration device and method, specifically, a composite fish reef system for controlling the coverage area of ​​aquatic plants in a grass-type lake and a construction method thereof, belonging to the technical field of lake ecological restoration and protection. Background technique [0002] Freshwater lakes have ecological functions such as regional water resource regulation and storage, water purification, local climate regulation, flood storage, and species diversity protection, especially freshwater shallow lake wetland ecosystems, where many freshwater fish, aquatic plants and other wild animals important habitat for plants. However, due to the influence of natural factors and human activities, many lakes receive industrial wastewater and domestic wastewater in the basin, the water body is polluted, the wetland ecosystem is severely damaged, and the water quality is deteriorating year by year....

AI Technical Summary

Problems solved by technology

Studies have shown that a certain proportion of aquatic plant coverage can promote the material circulation of lakes and can purify water quality. However, if the coverage of aquatic plants exceeds 70%, it will cause hypoxia in the water body at night, affect the survival of aquatic organisms, and reduce biodiversity. Index, especially in the high temperature season, a large number of aquatic plants die and rot, rapidly consume dissolved oxygen and release nutrient-rich substances such as nitrogen and phosphorus, resulting in a sharp drop in dissolved oxygen in the water body and rapid deterioration of water quality, death of other aquatic organisms, damage to the ecosystem, and decline in fishery resources

[0004] At present, the ecological restoration of shallow polluted lakes is a major problem facing our country. The control of aquatic plants in natural waters mainly depends on manual salvage, which is time-consuming, laborious and costly. Quickly covers the water surface, the effect is not good

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