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1、Our Mother River Is In Danger -by YIN RAN 101200080This is an article about water quality of Nanjing by a college student from Nanjing University. The article contains four parts, including changes of water quality of Yangtze River, drinking water quality of Nanjing, and the relationship between Yan
2、gtze River and Nanjing.1. Relationship between Nanjing and Yangtze RiverNanjing, the capital of Jiangsu (one of most developed area in China), is situated on the lower reaches of the Yangtze River. The river water is presently the sole resource for the production of drinking water in Nanjing. Water
3、quality is of constant concern for most citizens. 2. Changes of water quality of Yangtze RiverThe Yangtze River is 6300km long and the basin size is about 1,800,000km2, and it is the mother river of Nanjing. But from 1980 to 2000, the water quality of Yangtze River has changed a lot. Here is some ta
4、bles bellow to show the changes.Table 1 water quality of Yangtze River and eutrophication throughout the yearYear Water quality standard（）Eutrophication ()()()() ()TP(mg/l)TN(mg/l)CODmn(mg/l)198169301/0.020.092.80199070.715.813.5/0.052.204.00199546.737.216.2/0.1052.084.402000/13714120.102.545.28The
5、table is about the water quality of Yangtze River and eutrophication over the years.In China, the standard of water quality can be divided into six levels. They are class-，class-, class-, class-, class-, and class- . Class- is the best. From the table we can see the class- water decreased from 1990
6、to 2000, till 2000, there was no class- water in Yangtze River. While the class- was getting more and more. It reaches to 71% in 2000. Besides, in 2000, class-, and class- appeared.Whats more, eutrophication is also a problem of Yangtze River, the table also shows us that the changes of TP, TN, and
7、CODMN. In general, they all increased throughout the years.Here are three graphs that describe the change of total phosphorus concentrations (TP), Total nitrogen concentrations (TN), and Chemical oxygen demand (CODMN) concentrations of Yangtze RiverGraph 1Total phosphorus (TP) concentrations of Yang
8、tze River throughout the yearsGraph 2Total nitrogen (TN) concentrations of Yangtze River throughout the years Graph 3 Chemical oxygen demand (CODMN) concentrations of Yangtze River throughout the yearsWe can see from these graphs, TP, TN, and CODMN all increased compared to the past. Thats why more
9、and more eutrophication phenomenon appears. To solve the problem, we must take control of the concentration of TP, TN, and CODMN. 3. Causes of these changes From 1950-2010, the central and lower reaches of the Yangtze lost approximately two thirds of its lakes due to increased land reclamation for a
10、griculture and industrial development. This has resulted in a water storage capacity loss roughly equivalent to 20 million Olympic-sized swimming pools and means that smaller floods now have the potential to inflict much more damage. Meanwhile, population growth and rapid economic development - part
11、icularly in the central and lower Yangtze - as well as excessive fish farming has resulted in more serious water pollution issues and increased instances of eutrophication, a process where excessive nutrients diminish water quality in lakes or other bodies of water.The annual discharge of sewage and
12、 industrial waste in the river has reached about 25 billion tons, which is 42% of the countrys total sewage discharge, and 45% of its total industrial discharge.In addition, the CCICED (China Council for International Cooperation on Environment and Development) Task Force on Reducing Non-Point Pollu
13、tion from Crop Production concluded that 92% of the nitrogen discharged into the Yangtze is from agriculture.Shipping discharges are also to blame for the rivers declining health. As well, the extensive loss of floodplain areas to agriculture has reduced the basins ability to detoxify pollutants.The
14、 major pollutants in the Yangtze main stem are suspended substances, oxidizing organic and inorganic compounds, and ammonia nitrogen. This has severely reduced drinking water quality and contributed to dramatic eutrophication.4. Conclusion The Yangtze River is the mother river of Nanjing and many ot
15、her cities in China. Now, it is polluted more and more serious. The water quality is decreasing and the condition of eutrophication is getting worse and worse. There are many kinds of reasons that lead this situation. There are many things that need us to do. For example, we should strengthen the education and publicity, to wake up the awareness of protecting. The government should enhance the legislation to punish the emission of pollutants. And as a member of Nanjing, I really want the water quality to be better and bet
