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Blue algae bloom control method based on floating rice cultivation

A technology for cyanobacterial blooms and control methods, applied in rice cultivation, plant cultivation, chemical instruments and methods, etc., can solve problems such as use limitations, and achieve the effect of improving water quality and controlling lake blooms

Inactive Publication Date: 2009-04-22
ZHEJIANG UNIV
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Problems solved by technology

[0017] The above-mentioned various reasonable methods have their own characteristics, but they also have limitations in use.

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  • Blue algae bloom control method based on floating rice cultivation
  • Blue algae bloom control method based on floating rice cultivation

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Embodiment Construction

[0026] The continuous increase of nitrogen and phosphorus concentration in water body is the prerequisite for the bloom of cyanobacteria. The phosphorus content in the water exceeds 0.3mg.L -1 , the growth and reproduction of algae will be significantly accelerated. Some scholars have proposed a formula to measure whether the water body has reached eutrophication. At present, the general standard for judging the eutrophication of water bodies is: the nitrogen content exceeds 0.2-0.3 mg.L -1 , phosphorus content greater than 0.01 ~ 0.02mg.L -1 , BOD greater than 10mg.L -1 , the total number of algae in fresh water with a pH value of 7-9 exceeds 20,000 cellsmL -1 , the content of chlorophyll a is greater than 10μg.L -1 .

[0027] Light is a necessary condition for the growth of cyanobacteria. Light-loving and high temperature are important characteristics of cyanobacteria. When the temperature is high and the light is high, cyanobacteria will grow rapidly. Content thresh...

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Abstract

The invention discloses a cyanobacteria bloom control method based on the cultivation of floating rice. Rice sprouts at 5-trifoliate stage are fixed on a polystyrene foam board by a sponge, then the polystyrene foam board floats on a water body which needs to be controlled for cultivation, rice is duly harvested, and the polystyrene foam board is recovered. The cyanobacteria bloom control method can effectively control water bloom in lakes; and the cyanobacteria bloom control method is applied to ensure that the count of blue-green algae cells in eutrophic water bodies of the lakes is decreased to less than 1,000 ml<-1> within ten days in summer, thereby apparently improving the water quality of the eutrophic water bodies.

Description

technical field [0001] The invention relates to a technology for controlling cyanobacteria blooms in eutrophic water bodies, in particular to a method for controlling cyanobacteria blooms by using floating rice cultivation techniques. Background technique [0002] Water eutrophication is a phenomenon of water aging. When eutrophication occurs in the water body, plankton multiply in large numbers, and the water surface often appears blue, red, brown, or milky white, depending on the color of the dominant plankton. This phenomenon is called "Water Bloom" in rivers and lakes, and "Red Tide" in the sea. [0003] Eutrophication of lakes is a common problem. Developed countries such as Europe and the United States have encountered the same situation in the early stages of industrialization. At present, in addition to developed countries, China, India, Brazil, Paraguay, the Philippines, and Thailand are also facing the problem of lake eutrophication. Eutrophication of lakes is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32A01G16/00A01G22/22
Inventor 周启发
Owner ZHEJIANG UNIV
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