Eutrophication of water body is a global water environment problem. There are more than 2,700 lakes in China with a total area of 9 1 10,000 km2. According to the survey data and the evaluation indexes of lake eutrophication at home and abroad, 55.8% of the 37 typical lakes in China are moderately eutrophic and moderately eutrophic, 14.7% is eutrophic and 8.8% is severely eutrophic. More than 90% of water pollution in China is caused by eutrophication caused by excessive content of nitrogen and phosphorus, the most basic essential nutrients for plant growth. Ecological floating island technology is a biological treatment method that uses floatable materials as matrix or carrier to plant higher aquatic plants or terrestrial plants in eutrophic water, and through the absorption or adsorption of plant roots, nitrogen, phosphorus and organic pollutants in water can be reduced, thus purifying water quality. At the same time, the eutrophic substances in the water are removed from the water by harvesting plants, so as to improve the water quality and create a good water environment. The "ecological floating island" appearing in some literatures at present,
Artificial floating island, artificial biological floating bed, biological floating bed and floating bed soilless culture are all the same or similar concepts.
After decades of research and development, the technology of ecological floating island at home and abroad has been greatly improved, but it is still in the stage of experiment and demonstration, and there are some problems and shortcomings.
The existing 1 ecological floating island culture is not easy to standardize and popularize. Different lakes and rivers have different degrees of eutrophication, and water flow, temperature, wind speed and water level fluctuation all need corresponding floating island design combinations and floating island plant species collocation, so it is difficult to formulate unified standards for popularization and application.
2.
The existing ecological floating island is difficult to carry out mechanized operation. Ecological floating islands float on the water surface, and daily management is completed on the water surface. At present, most of its management operations are done manually, but the scale is small.
The experimental demonstration in this area is acceptable. If it is popularized in a large area, it needs to be harvested frequently and timely, and manual operation can not meet the needs, which limits its development.
3.
The existing ecological floating island has a long production and construction period. At present, most ecological floating islands adopt the mode of on-site production and on-site planting, and the period of large-scale production and construction is long.
4.
The existing ecological floating islands are difficult to survive the winter. Most plants on the ecological floating island can't survive the winter, especially in the northern region where the winter weather is cold, so plants need to be replanted in the next spring.
5. Most of the existing ecological floating islands use large aquatic plants and vegetables, which are difficult to resist extreme winds, heavy rains and big waves.
6. At present, the single area of ecological floating islands used at home and abroad is small, and most of them are used in small rivers and lakes, so it is difficult to carry out ecological restoration on larger rivers and lakes. Now there must be a super-large ecological floating island.
Beijing Zhumengyuan Roof Soilless Greening Technology Co., Ltd. makes use of the advantages of soilless lawn to make ecological floating islands, which has achieved good results and solved many problems existing in the production technology of ecological floating islands at home and abroad, and can achieve the following effects;
1. Soilless lawn ecological floating island is a perennial plant with developed roots and strong adaptability, which has the potential advantage of purifying eutrophic water. It can resist extreme wind, rainstorm and big waves, and can be used under different water flow, temperature and eutrophication levels.
2. After the soilless lawn ecological landscape floating island is made, it floats on the water, and the landscape is vertical and uniform, just like a green carpet, and the landscape effect is very obvious. Ecological Landscape of Floating Island with Soilless Lawn In winter, it is evergreen all the year round on the unfrozen water surface in the south, and the soilless lawn on the frozen water surface in the north can turn green in the next spring when it freezes on the ice.
3. The ecological landscape floating island made of soilless lawn has smooth surface and enough buoyancy, so workers can mow the lawn in a large area with lawn mower. Because of the special structure and convenient management of the ecological landscape floating island without soil lawn, it can be used to make super-large floating islands. Soilless lawn is used on the ground, 1 afraid of drought, 2 afraid of lack of fertilizer, but the ecological landscape floating island without soilless lawn will not have these problems. Some experts have proved that the chlorophyll content, leaf water content, dry weight, density and coverage of tall fescue under water surface cultivation conditions are significantly higher than those under soil cultivation conditions. Ecological landscape floating island of Gramineae soilless lawn is an effective new way to repair eutrophication of large rivers and lakes.