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This article relies on science and technology projects in Shanghai World Expo (2007BAK27B05-7) - Expo landscape water biological and ecological restoration technology projects to the Expo site Bailianjing river engineering base for the trial, the use of technology to achieve ecological floating bed river ecological restoration and landscaping, the main research contents and conclusions are summarized as follows: 1, the evaluation of the ecological floating bed Bailianjing river on the Expo effect of comprehensive management, the use of systems analysis methods to determine the evaluation index system of landscape indicators weights. The results showed that: eco-efficiency indicators in the B-class indicators than the maximum weight, the weight value is 0.6441, followed by landscape benefits, its weight is 0.2074, and finally the human benefits, its weight is 0.1486; three B grade average indicators scores were 8.83,9.12 and 8.26 (out of 10 points); B-level indicators in addition to the weight of each index color continuity and works in harmony with the river environment, combined givers, other indicators weights are less. The evaluation criteria indicate that ecological floating bed for application in the river, the main purpose is still the ecological restoration, but because more intuitive visual effects, you can directly get feedback, so the highest score. 2 to study the ecological floating bed Bailianjing river on aquatic biodiversity, select four groups of eight sampling points and set the corresponding blank. Sampling frequency is once a month, on the identification and analysis of phytoplankton in water samples, the results showed that: Ecological Floating Bed dominant species of phytoplankton diatoms Fragilaria is Fragilaria and Cryptophyta Blue cryptalgal are hidden blue algae species, phytoplankton species in the region has increased over the blank area, community structure is more complex, biodiversity stabilized. Floating Bed mean phytoplankton diversity index was 2.47, in the case of β-pollution. Blank areas mean diversity index was 1.86, an α-in dirt. Floating Bed phytoplankton biodiversity significantly higher than the blank area. 3, on the ecological floating bed project area watercourses key water quality indicators have been tracking and monitoring, time span from January 2010 to April 2011, the sampling frequency is once a week, select the floating bed area and a blank area for sampling and analysis, the experimental results showed that: In winter, water purification effect is not obvious, this is mainly because most aquatic plants stop growing, the water body nutrient absorption capacity decreases. While winter low temperature lead to microbial activity is not high, but the deposition due to some dead branches rotten leaves decay, floating bed area will lead to physical and chemical indicators of local deviations. In the ecological floating bed area of ??the vegetation period (March-April), floating bed for COD, TN, TP removal efficiency significantly, the removal rate reached 28.2%, 32.7%, 21.8%, ecological floating bed on the river water with some improvement. China has a huge water area, where the river is one of the most important bodies of water, a healthy river ecosystem can play a good ecosystem services. However, according to the 2010 Environmental Quality Survey report shows that the water quality of the river situation is not optimistic, especially in large cities, most rivers are subject to different degrees of contamination, remediation of contaminated river various means, the ecological floating bed technology can be in-situ treatment of sewage, not only saves capital, but also has significant landscape and ecological benefits, the paper can be ecological floating bed technology in contaminated medium-sized river training application provides a theoretical basis and engineering practical experience and theoretical basis.
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