Method for improving eutrophic water body by planting vegetables on water surface

Abstract

The invention relates to a method for improving an eutrophic water body by planting vegetables on a water surface, which comprises the following steps of: (1) selecting fresh water of which the nitrogen content is more than or equal to 0.5 mg / L, phosphorus content is more than or equal to 0.05 mg / L and potassium content is more than or equal to 0.5 mg / L in a water body; (2) enclosing a vegetable planting area; (3) arranging the vegetable planting area; (4) manufacturing a floating planting bed; (5) selecting vegetable varieties; (6) planting vegetables; (7) managing, namely controlling the speed of water flow according to the growth vigor of the vegetables and a detection result of water quality, so that compared with a water inlet in the planting area, at a water outlet, the total nitrogen content is reduced by 30 to 90 percent, the total phosphorus content is reduced by 20 to 70 percent, and the potassium content is reduced by 10 to 50 percent while the growth vigor of the vegetables is ensured; and (8) selecting the vegetable varieties which is suitable to be planted in different seasons, and planting in turn throughout the year. In the method, the eutrophic water body is improved effectively by a biological cleaning method, and compared with physical and chemical means of managing the eutrophic water body, the method has obvious effect and low investment cost and is convenient to popularize and perform large-scale planting; and the vegetables are planted without applying fertilizer and spraying pesticides, so a new pollution source is not generated, and the planted vegetables reach the standard of green organic vegetables. By the method, resource utilization is maximized, and vegetable baskets of people are abundant while the eutrophic water body is managed. The production management and monitoring are convenient, so the method is particularly suitable for the large-scale planting.

Description

technical field [0001] The invention relates to a method for treating eutrophication of slow-flowing water, in particular to a method for improving eutrophication of water by planting vegetables on the water surface. Background technique [0002] The eutrophication of water body is that under the influence of human activities, a large amount of mineral nutrients such as nitrogen and phosphorus required by organisms enter slow-flowing water bodies such as lakes and estuaries, causing algae and other plankton to multiply rapidly, the dissolved oxygen content of water body decreases, and water quality deteriorates. , a phenomenon in which fish and other organisms die in large numbers. The essence of eutrophication is that a large number of nutrients accumulate in the water environment, causing a series of complex physical, chemical and biological changes in the water body. In the process of eutrophication, nutrients such as nitrogen and phosphorus provide a material basis for ...

AI Technical Summary

Problems solved by technology

The use of biological floating beds to control eutrophic water bodies is gradually becoming a key technology for the restoration of damaged aquatic ecosystems. The research and application of floating bed systems in China is increasing, and the types of plants have also developed from rice, ryegrass and cress to vetiver and canna. , water spinach and other aquatic plants or water-loving plants, although these plants have a certain ability to purify water, some can also be used as feed, fuel, etc., but the overall economic benefits are not high, and some plants, such as water hyacinth, It has a strong ability to expand. If it is not well controlled, it will easily flood and wither in autumn and winter.

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