Ecological method and application for controlling quantity of spirogyra biomass in lakes

Abstract

The invention discloses an ecological method and an application for controlling quantity of spirogyra biomass in lakes. The ecological method comprises the steps of: breading tilapias in lakes where submerged plants are grown; controlling the quantity of the tilapias to minimize influence of the tilapias on the submerged plants and effectively control spirogyra. The ecological method provided by the invention can prevent chemical toxicity brought by chemical method for controlling spirogyra and reduce manpower and property waste caused by manually catching sponge; and the harvested tilapias can bring a certain economic benefit; furthermore, the ecological method also can effectively control the quantity of pomacea canaliculata. As can be seen, the ecological method and application for controlling the quantity of the spirogyra biomass in lakes can be applied to maintaining the lake ecosystem, and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of aquatic ecosystem hazards, and in particular relates to an ecological method and application for controlling the biomass of Spirogyra in lakes. Background technique [0002] The problem of eutrophication in lakes and other water bodies in my country has become increasingly prominent. Relevant research and practice in recent decades have shown that restoring aquatic vegetation, optimizing the structure of the lake ecosystem, improving the function of the aquatic ecosystem, and maintaining its virtuous cycle are effective measures to restore the eutrophic water body of urban lakes. In the restoration process of many lakes, it was found that due to the increased transparency of the lake area and the reduction of nutrient salts, the competitiveness of attached algae such as Spirogyra was greatly improved. This makes it easy to breed a large number of filamentous algae mainly Spirogy...

AI Technical Summary

Problems solved by technology

[0004] Both Spirogyra and submerged plants are primary producers in the aquatic ecosystem, and their ecological niches are highly overlapping. The existence of a large number of Spirogyra will inevitably compete with aquatic plants for the limited nutrients in the water body, affecting their growth; Large clumps of Spirogyra will produce a shading effect, affecting the transmittance of sunlight in the water body, thus affecting the acquisition of light by other aquatic plants, especially submerged plants; a large number of Spirogyra attached to submerged plants will mechanically damage and affect plants growth; when Spirogyra dies and rots, it will release harmful substances to the water body to affect the water quality, and affect the growth of submerged plants through allelopathy, and at the same time, a large number of dead algae will affect the ornamental value of the water body

While Spirogyra dies and rots, it will consume a large amount of dissolved oxygen, resulting in short-term hypoxia in the water body, and eventually the death of benthic animals and fish, causing the destruction of the entire ecosystem

[0005] Common control methods for Spirogyra include: (1) chemical methods, adding chemical reagents such as pyrazosulfuron-methyl or copper sulfate powder to inhibit the growth of Spirogyra, but the disadvantages are high toxicity, high biological toxicity, and great environmental impact; (2) physical methods The method is to carry out mechanical salvage, and the disadvantage is that it is time-consuming, laborious and expensive; (3) the biological method is to extract the leachate of terrestrial or aquatic plants, and inhibit the growth of Spirogyra through allelopathic effects. The disadvantages are also expensive and have certain toxicity. while not working well