In the image below the two sides of the diagram show the process of Lake Aging t

Question

In the image below the two sides of the diagram show the process of Lake Aging through the process of eutrophication. The left side shows natural eutrophication and the right side shows accelerated or cultural eutrophication. For this forum please comment, from research, on what you think contributes to accelerated eutrophication.

https://www.google.com/search?q=oligotrophic+lake+diagram&tbm=isch&tbs=simg:CAQSmQEJlPga_1KBjMoMajQELEKjU2AQaBggVCAgICgwLELCMpwgaYgpgCAMSKJoT9QmMCssd4AicE-8TmRPfCJsTkze3PrY-uCiPN7kovD66PsQ-lTcaMAPsglXf_1eiHkrP58X1lboR9FFjwzoSl5rZFgNe1Zboy4P-KKROrEyAUwgHw4Ax6dyAEDAsQjq7-CBoKCggIARIEy8l89ww&sa=X&ved=0ahUKEwi54PSw5pTcAhXDSt8KHRtVDTsQwg4IJigA&biw=1440&bih=767#imgrc=UGQsWR77U3AwtM:

Explanation / Answer

Natural eutrophication is a normal process. Cultural eutrophication is the accelerated eutrophication caused by humans.

Cultural eutrophication is the process that speeds up natural eutrophication because of human activity. There are three main sources of anthropogenic nutrient input: erosion and leaching from fertilized agricultural areas, and sewage from cities and industrial waste water. Atmospheric deposition of nitrogen (from animal breeding and combustion gases) can also be important.

The most common nutrients causing eutrophication are nitrogen and phosphorus. The main source of nitrogen pollutants is run-off from agricultural land, whereas most phosphorus pollution comes from households and industry, including phosphorus-based detergents. These nutrients enter aquatic ecosystems via the air, surface water or groundwater. Most of the commercially fixed nitrogen and mined phosphorus goes into production of fertilizer. The rising demand for fertilizer has come from the need to meet the nutritional demands of our rapidly expanding human population. The rise in intensive fertilizer use has serious implications for coastal habitats because greater application results in greater runoff, and the fraction of fertilizer lost from fields will increase with intensity of application. Increased global production of nitrogenous fertilizers have largely been linked to concerns over the relationship between water quality and eutrophication. Nutrient removal in sewage treatment plants and promotion of phosphorus-free detergents are vital to minimize the impact of nitrogen and phosphorus pollution in Europe's waters.

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