PRELIMINARY DISCUSSION ON EUTROPHICATION STATUS OF LAKES,RESERVOIRS AND RIVERS IN CHINA AND OVERSEAS

摘要: With human's increasing development and use of environmental resources, industrial agricultural production have rapidly expanded developed, especially since entering new century. Industrialization results in urbanization, which a large amount domestic sewage containing nitrogen phosphorus are discharged into nearby lake, reservoir river, increase nutrient load water bodies. For improvement production, more chemical fertilizer livestock night soil used year after year, thus increases gradually by rain scouring penetration. Human activities that cause excess nutrients to enter body speed up the eutrophication process. Investigation shows about 30%～40% worldwide reservoirs lakes been eutrophied different extent, lake trends aggravate recent years China, from 41% later 1980s 77% 1990s. Reservoir is also serious, i.e. number storage account for 30.8% 11.2% total. In general, extent scope trend aggravate. Extent urban city higher than other region. Eutrophication relative still bodies, such as reservoir, serious those regions stagnant reservoirs, rivers, but river shouldn't neglect. has become one important environment issues world protection.