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Submerged plants, water ecological restoration is a hot research field of domestic and international water bad environment. Submerged plants as the primary productivity of aquatic ecosystems, aquatic ecosystems play an important role. In order to study the effect between submerged plants and water environment; This paper carried out the following main elements: (1) in the summer, covered with sediment in the cement pond cultivation of different density (500g/m2, 200 g/m2, 100g / m2, 50 g/m2) Vallisneria research Vallisneria pond water purification effect. The results show that: in the 19-day trial period, 500g/m2, 200 g/m2, 100 g/m2 and 50 g/m2 Vallisneria TN removal rate were 66.67%, 70.95%, 66.48%, 70.48%, respectively, significantly higher than the control group, but no significant difference between the groups of different densities. 500g/m2, 200 g/m2, 100 g/m2, 50 g/m2 Vallisneria Vallisneria removal rate of TP were 56.11%, 63.75%, 61.13%, 57.54%, and the control group than the difference is not significant, the difference The differences in density between groups was not significant. 500g/m2, 200 g/m2, 100 g/m2, 50 g/m2 Vallisneria nitrate removal rate were 83.33%, 76.83%, 70.87%, 72.88%, and the control group than the difference is not significant, 500g / The m2 the Vallisneria of removing significant rates with 100 g/m2 and 50g/m2 difference. 500g/m2, 200 g/m2, 100 g/m2, 50 g/m2 Vallisneria nitrite removal rate were 97.39%, 97.62%, 98.54%, 97.89%, and the control group than the difference is not significant, different density no significant difference between the groups. 500g/m2, 200 g/m2, 100 g/m2, 50 g/m2 Vallisneria COD removal rate were 47.92%, 57.92%, 60.98%, 71.93%, and the control group difference is not significantly different density group between the difference was not significant. At the same time, the waters of dissolved oxygen (DO) and pH Duty change significantly, maximum of dissolved oxygen in the control group in 13:30, while planting Vallisneria maximum after 15:30, with dissolved oxygen and pH changes. (2) decomposition mesh bag method in winter, set in a plastic bucket and field ditches different processing study the the Vallisneria corruption impact on the water environment and nitrogen, phosphorus loss rule. The results show that: most of Vallisneria winter corruption, the release of phosphorus sediment adsorption out phosphorus into the water column rarely; Vallisneria corruption to ammonia, nitrite and nitrate in the form of water is released into very limited; so bitter winter grass corruption limited impact on the eutrophication of water bodies. Different environments Vallisneria Vallisneria corruption process dry weight, TN TP residual rate have a significant impact; slow the presence of sediment in the dry weight loss of speed, and speed up the rate of loss of plant TN and TP; and Vallisneria phosphorus release in the decomposition process. The Vallisneria decomposition stages begin 36d decompose very rapidly broken down into a slow period, from 36d to 66d. (3) as a research object submerged plant Vallisneria pond water culture plastic bucket the Vallisneria and adjust its ammonia concentration and pH, and to study the impact of different environmental conditions on the growth of Vallisneria. The results show that: the non-ionic ammonia affect the growth of plants, plant biomass is significant, and the pH value and ammonia nitrogen interaction of Vallisneria chlorophyll content significantly affected. When the pH and ammonia concentration reaches a certain height, so the plants lose the balance of carbon and nitrogen, resulting in the inhibition of the growth of plants. In the long-term high pH and ammonia impact the Vallisneria suffered - given environmental stress, plants SOD and MDA increased significantly.
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