Study on Eutrophication in Landscape Lake of Different Trophic Levels by Microcosm Experiment

Abstract

In this paper, a microcosm system was designed targeting at the landscape lake to study the eutrophication mechanism of the water by controlling the eutrophication level in water, measuring and comparing the water quality indicators. Firstly, the microcosm trophic level configuration and ecological balance cycle experiment were designed.Secondly, omnivorous fish and zooplankton were put into the system to simulate the biological population structure in the landscape water, the relations and trend of change among the elements of temperature, pH and dissolved oxygen, nitrogen, phosphorus, and chlorophyll a in the water were measured and analyzed. The results show that the one-level trophic microcosm system has good effect on controlling the nitrate nitrogen, phosphate and total phosphorus; the two-level trophic microcosm system has good effect on controlling chlorophyll a; the three-level trophic microcosm system has good effect on controlling the nitrate nitrogen and total phosphorus and maintains good stability of pH.Finally, relative suggestions and measures on the control of eutrophication lake were proposed based on data analysis, in order to promote the sustainable development of water.