Question: What is meant by ‘eutrophication’? Explain with reference to the severity of the problem in your own country.
Eutrophication is the ecosystem response to the addition of artificial or natural substances to an aquatic system. (Schindler, David and Vallentyne, John R. 2004)Most people don’ t really know about it, so I’m writing this essay to tell some facts about two major causes, the bad effect in my country – China and the prevention and reversal and how can the algae be used to make more benefit to the world and people who live on it.
The two major causes of eutrophication are excess nitrates and excess phosphates in water. (e-How Jul 05, 2012)Many farmers use fertilizers to make their plants grow better, but one of the most frequently-used fertilizers is the fertilizer which contain nitrates and phosphates. Once fertilizer is applied, the nitrates, which are water soluble, will leach into groundwater or erode and end up in surface runoff. Phosphates will adhere to soil articles, and often accumulate in soil and erode, along with soil, into aquatic environments. ( Smith, V. H.; Tilman, G. D.; Nekola, J. C. 1999.) Meanwhile, nitrates can also vaporize into the atmosphere, where they become a major source of acid rain. When the raindrops drop into lakes or rivers and streams, there are nitrates that come into water and cause the eutrophication.
The bad effect of eutrophication in China is really serious. One of the most famous ones is the Tai River blue-green algae in 2007. Because of the eruption of blue-green algae, the water can’t be used at all. It smells like something is becoming putrid. Also some algal blooms are toxic to plants and animals. It has affected the citizen’s lives; they can just drink and use the water which was brought in shops. The urgent demand of the water has caused the price of the water to became more and more expensive. (Face to the Tai River blue-green algae 2007) It has not only brought people a lot of...
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