Study on Eutrophication, Phosphorus Pollution and Morphological Analysis of Separated Lakes

Abstract After urban lakes are divided into “ponds”, they are more affected by human beings and more prone to eutrophication. In this paper, five “ponds” in a university park in Nanchang were collected as research objects, and samples of lake water quality and sediment, as well as aquatic plants and animals on ecological floating beds were collected. Relevant indicators such as ammonia nitrogen, TP and sediment phosphorus were analyzed in the water, and the relationship between phosphorus form analysis and water eutrophication was discussed. Results: On the surface, severe eutrophication occurred in the lakes, and the water quality was Class V, which was related to external input and internal pollution of sediments. The main influencing factors of environmental pollution involved TP, ammonia nitrogen, etc. The TP content of one reservoir was seriously polluted, while the other three reservoirs were moderately polluted. The higher the pollution level of organophosphorus in sediments, the higher the content of OP in sediments. Fe/Al-P accounted for the majority of inorganic phosphorus in the four reservoirs. Fe/Al-P is active phosphorus and the main cause of eutrophication in ponds. Suggestions: Improve the drainage and diversion of lake water, clean up underwater silt, and cultivate submerged plants.