Periphytic algae control method for large-scale artificial water conveyance canal

Abstract

The invention discloses a periphytic algae control method for a large-scale artificial water conveyance canal, wherein the method comprises the following steps: arranging a triangular net cage on a canal slope, wrapping each surface of the net cage by using a net sheet, tightly attaching the bottom of the net cage to the canal wall, and ensuring that the mesh of the net sheet is 5 cm; putting megalobrama amblycephala into the net cage, wherein the putting specification of the megalobrama amblycephala is 400-1000 g / fish, and the throwing density is 0.25-1 / m<2>; fishing out the megalobrama amblycephala after the megalobrama amblycephala live in the net cage for at least four months, and meanwhile, putting a batch of new megalobrama amblycephala of the specification to continuously control the periphytic algae; measuring the biomass of the periphytic algae on the channel slope and the biological parameters of fishes to quantitatively evaluate the algae control effect of the megalobrama amblycephala. According to a biological manipulation principle, the in-situ net cage device is combined, and the characteristic of high feeding habit plasticity of the megalobrama amblycephala is utilized, so that the megalobrama amblycephala is limited to convert and utilize the periphytic algae on the canal wall in the net cage, and the purpose of reducing the biomass of the periphytic algae in the water conveyance canal is achieved.

Description

technical field [0001] The invention relates to the technical field of water ecological restoration, in particular to a method for controlling algae growth in large-scale artificial water delivery channels. Background technique [0002] The central channel of the South-to-North Water Diversion Project is a large-scale artificial water delivery channel, and its hydraulic connection, aquatic habitat conditions, biogeochemical cycle, etc. are significantly different from natural rivers. Since the opening of water in 2014, the water ecosystem of the central channel has been in the process of rapid establishment and evolution. The balance of the ecological system is still poor, and abnormal phenomena of the ecosystem have occurred from time to time. Since the water was opened, there have been a large number of phytoplankton and epiphytic algae in the main channel of the central line, which has caused adverse effects on the water intake of water plants along the line and increased ...

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Problems solved by technology

[0002] The central channel of the South-to-North Water Diversion Project is a large-scale artificial water delivery channel, and its hydraulic connection, aquatic habitat conditions, biogeochemical cycle, etc. are significantly different from natural rivers. Since the opening of water in 2014, the water ecosystem of the central channel has been in the process of rapid establishment and evolution. The balance of the ecological system is still poor, and abnormal phenomena of the ecosystem have occurred from time to time. Since the water was opened, there have been a large number of phytoplankton and epiphytic algae in the main channel of the central line, which has caused adverse effects on the water intake of water plants along the line and increased business operations. The cost also brings great challenges to the water quality protection and ecological regulation of the middle line project;

[0003] The traditional methods of controlling algae include physical method, chemical method and biological method. The physical method is to manually or mechanically salvage the algae and dig the bottom mud. The auxiliary means of algae removal have very little effect and cannot solve the problem fundamentally, and will consume a lot of manpower and material resources; the chemical method uses various chemical agents, which contain many soluble toxic and harmful compounds, which are harmful to other aquatic organisms in the water body. A certain degree of injury or even death; the biological law is to use fish biological manipulation technology to control algae, but it is still unknown how effective the biological control of algae is under the conditions of a large artificial water delivery channel such as the central canal. Therefore, the present invention Propose a method for controlling algae growth in large-scale artificial water delivery channels to solve the problems existing in the prior art

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