Ecological method for controlling excessive proliferation of periphytic filamentous algae through submerged plant patch mosaic pattern

Abstract

The invention discloses an ecological method for controlling excessive proliferation of periphytic filamentous algae through a submerged plant patch mosaic pattern. The ecological method comprises steps as follows: 1), water environment features including water depth, water flow, transparency, sediments, nutritive salts, plankton and the filamentous algae of a to-be-restored area are surveyed; 2), purse seining is performed by the aid of nylon ropes, a purse seine is dropped to be contacted with the sediments, and if a number of herbivorous fishes exist in the submerged plant patch mosaic pattern restoration area, the herbivorous fishes are expelled manually; 3), submerged plant species are selected according to the restoration area water environment obtained through the survey; 4), the submerged plant patch mosaic pattern is designed according to underwater ecological niche, growth and propagation features and water level of submerged plants; 5), submerged planting is performed in a clustering manner according to the designed submerged plant patch mosaic pattern; 6), the growth vigor of the submerged plants is monitored regularly. With the adoption of the ecological method, the problems of low survival rate and single underwater ecological niche of the submerged plants are solved, and the cover degree of the restored submerged plants is up to 70%; abnormal proliferation of the low-grade periphytic filamentous algae in a lake with eutrophication is effectively controlled, and the growth rate of the periphytic filamentous algae is reduced by 35% averagely.

Description

technical field [0001] The invention belongs to the fields of ecological restoration of landscape water bodies and surface water quality improvement and improvement, and more specifically relates to an ecological method for controlling the excessive proliferation of filamentous algae by constructing a mosaic pattern of submerged vegetation patches in shallow water eutrophic lakes, which is suitable for shallow water The control and management of lake eutrophication, and the transformation of algae-turbid water body to water grass-clear water body. Background technique [0002] The eutrophication of shallow lakes, reservoirs and other water bodies will affect regional economic development and social harmony, so it has received more and more attention from all walks of life. In particular, the outbreak of filamentous algal blooms will consume a large amount of dissolved oxygen in the water body, release toxins, cause water pollution, and affect the growth of other aquatic orga...

AI Technical Summary

Problems solved by technology

The method is simple to operate, reasonable in design, ecological and environmentally friendly, and is easy to be widely promoted. It can quickly construct a composite community of submerged plant patch mosaic patterns, form an underwater forest distribution pattern with a vertical gradient of "upper-middle-lower", and fully occupy the underwater forest. Ecological niche, competing with filamentous algae for ecological resources such as light, nutrients, dissolved oxygen, and growth space, and at the same time producing allelopathic effects on filamentous algae, which solves the single underwater niche in the current restoration and reconstruction of submerged plants problems, and also effectively inhibit the excessive proliferation of filamentous algae in water

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