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Method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth

A technology of submerged plants and eutrophication, which is applied in the fields of chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult survival of submerged plants, low initial survival rate of plants, maintenance High cost and other problems, to achieve the effect of saving manpower and material resources, improving species diversity and low maintenance cost

Inactive Publication Date: 2015-07-01
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to restore aquatic vegetation, especially submerged plants, requires a lot of capital, manpower and material resources, and because the initial survival rate of the planted plants is relatively low, the later maintenance costs are high, and the recovery of plants is relatively slow. Nutritious lake water, the growth period of plants happens to be the period of algal blooms, and the massive reproduction of algae and its environmental effects often make it difficult for submerged plants to survive

Method used

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  • Method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth
  • Method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth
  • Method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A small lake is selected as the experimental area. The maximum water depth of the experimental area is 2.4m, of which the area with a water depth of 0-0.5m accounts for 15%, the area with a water depth of 0.5-1.0m accounts for 32%, the area with a water depth of 1.0-1.5m accounts for 33%, and the area with a water depth of 1.5-2.0m The area accounts for 15%, and the 2.0-2.4m area accounts for 5%. The experimental area is a water body with severe eutrophication. In November of the first year, plant the cold-resistant plant Smilax chinensis, and the planting density is 100 plants / m 2 , in the next season, due to the drop in temperature, the algae in the eutrophic water body will gradually decline and settle, and the transparency of the water body will gradually increase, providing a better living environment for the survival and growth of plants. Germinate and grow, and the plant survival rate is higher. Generally, in the northern part of my country, the water body freez...

Embodiment 2

[0036] A small artificial pond is selected as the experimental area. The experimental area is a rectangular pond with a length of 120m and a width of 80m. The bottom of the experimental area is relatively flat, and the surrounding area is built with stones vertically. Therefore, the water depth of the experimental area is 0-0.5m. The 0.5-1.0m area accounts for 0%, the 1.0-1.5m area accounts for 0%, the 1.5-2.0m area accounts for 95%, and the 2.0-2.5m area accounts for 5%. The experimental area is a breeding pond for many years, which was abandoned later, and the water body has already experienced eutrophication. In November of the first year, plant the cold-resistant plant Smilax chinensis, and the planting density is 100 plants / m 2 ; In November-December, weeds will germinate and grow one after another.

[0037] At the beginning of March of the second year, when the water surface freezes and starts to melt, the water depth is adjusted by pumping. At this time, the water dept...

Embodiment 3

[0043] Select a small lake as the experimental area. The experimental area is rectangular, 250m long and 115m wide. The bottom of the experimental area is relatively flat. The m area accounts for 14%, the 1.5-2.0m area accounts for 11%, the 2.0-2.5m area accounts for 4%, the area with a water depth greater than 2.5m accounts for 20%, and the area with a water depth greater than 2.5m is relatively concentrated. Eutrophication already existed in the water body in the experimental area.

[0044] In November of the first year, plant the cold-resistant plant Smilax chinensis, and the planting density is 100 plants / m 2 ; In November-December, weeds will germinate and grow one after another.

[0045] At the beginning of March of the second year, when the water surface freezes and starts to melt, the water depth is adjusted by means of gate drainage. At this time, the water depth is lowered by 0.5m to meet the needs of the weed growth. At the end of April, the temperature-loving pla...

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Abstract

The invention discloses a method for controlling lake eutrophication by regulating and controlling submerged plant growth through water depth. The method mainly comprises five steps, namely selecting a critical time point to plant submerged plants, selecting a critical time point to regulate and control the water depth and regulating the planting density of the submerged plants to enable the submerged plants to obtain the maximum biomass and provide such environmental conditions as optimal illumination, water temperature and the like, so as to control eutrophic water bodies more effectively. The method disclosed by the invention is convenient to implement and operate, low in submerged plant colony recover cost, capable of saving manpower and material resources, low in subsequent maintenance cost, high in plant survival rate and good in purification effect.

Description

technical field [0001] The invention relates to a method for controlling the eutrophication of lakes, in particular to a method for controlling the growth of submerged plants through water depth regulation and controlling the eutrophication of lakes. Background technique [0002] Eutrophication of water body is one of the main water environment problems of water quality deterioration. Lake eutrophication is the concentration of the natural evolution process of lakes caused by the impact of human social activities on lakes. Almost all lakes are facing eutrophication problems. Human activities This process is exacerbated. The main causes of eutrophication are air pollution, urban sewage discharge, excessive use of farmland chemical fertilizers, serious damage to the ecological environment, and water aquaculture. The eutrophication of the water body will cause the rapid reproduction of algae and other plankton, the decline of dissolved oxygen in the water body, the deteriorati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
Inventor 王立志刘前进
Owner LINYI UNIVERSITY
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