| Water is an important resource to the production of human society, and is inseparable to life which is being precious wealth to the development of society and continuing to live,production and management. However, in recent years,from the opinion of water resoures,the freshwater resourse of our country growing shortage due to social factors and the existing problem of eutrophication, makes the water more seriously.In recent years, people have gradually focused on the use of aquatic plants for water purification. But with plant growth, the problems emerged, after the plant entered a period of decline as plants decay substances produced from the decomposition of nutrients, easy to cause the water to the secondary pollution. However, some scholars have pointed out, in the autumn and winter plants decay will not have much impact on the water quality, but will improve water nitrogen and phosphorus cycle and water to avoid further deterioration.Gordon Euryale general plant in the south area of northern Jilin Province, especially little planting, this test will be as the research object to the Gorgon, eutrophication level set four concentration gradient, another group of no Gorgon Euryale ferox control group, which lasted the whole life cycle and after the decay, to study the effect of water purification of the migration of nutrients ability, Gorgon fruit rot will cause the water and sediment in the transformation. The research results show that:⑴ The changes of different degree eutrophication water body of Euryale leaf SPAD value influence. According to the different level of eutrophication in the determination of Euryale leaf SPAD value, leaf SPAD levels during the test, the rich Gorgon nutrition values in water changes little, gordon euryale seed in different concentrations of eutrophic level, water concentration will not affect the normal growth of Euryale ferox.⑵ The Gorgon purification effect on different grade of water eutrophication. In different degree eutrophication waters, nutrient- Gorgon fruit on water within the total nitrogen, nitrate nitrogen, ammonium nitrogen and total phosphorus have obvious purifying effect. Overall, total nitrogen removal performance: 2# > 3# > 1# > the blank group, the removal rates were 92.84%, 91.71%, 87.44% and 77.46%; nitrate nitrogen removal effect were 3# > 2# > 1# > the blank group, the removal rates were: 89.95%、89.03%、87.89%、85.17%; ammonia nitrogen removal effect were: 3# > 2# > 1# > blank, the removal rates were: 99.56%、99.51%、99.04%、69.84%. Total phosphorus removal effect were: 2# > 3# > 1# > the blank group, the removal rates were 87.3%, 82.9%, 76.7% and 64.6%.⑶ Gorgon septic effects on water quality. Decompose Gorgon, resulting in increased nitrogen and phosphorus concentration, but with the decay slowly reduced, the water quality impact will gradually become smaller, the specific performance of total nitrogen concentration will be slightly lower than the water concentration decay at the beginning of the phosphorus concentration, but slightly higher than the first concentration. But the control group concentrations were always below the Gorgon group.⑷ The study on the changes of Gorgon life cycle sediment nutrients. Through the analysis of sediment nitrogen obtained during the purification of water, 1# water, total nitrogen concentration in water increased firstly and decreased gradually and then increased, then decreased, at the end of the period, the content of total nitrogen in sediment is initially decreased significantly, and lower than the control group without Gorgon fruit. Expresses the change of Gorgon fruit over the whole period, even if the Gorgon fruit rot, sediment concentration of the final is still lower than the initial concentration. The concentration of total phosphorus in sediment and present first decreased and then increased slightly and the downward trend until December, decompose, phosphorus content in sediment was highest, reached 0.33g/kg, 32% higher than the original phosphorus content of0.25g/kg. |
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