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对北京城市河湖水质调研,21个水体中,已达中等程度富营养的水体11个,占58％;已达 严重富营养的2个,占11％。对11个水体浮游藻类的调查结果显示,由于营养程度高,浮游藻类 群落结构简单,物种多样性低,且多为耐污种类。北京城市河湖属于营养盐和有机物污染。污染物 主要来自点源,其次是面源。生态环境用水量少也是水体发生富营养化的原因之一。
Of the 21 water bodies in Beijing, the water quality of rivers and lakes in Beijing has reached 11, accounting for 58% of the total. Among them, 2 have reached serious eutrophication, accounting for 11%. The survey of phytoplankton in 11 water bodies showed that due to the high degree of nutrition, the community structure of planktonic algae is simple and the diversity of species is low, and most of them are resistant to fouling. Beijing’s urban rivers and lakes are contaminated with nutrients and organic matter. Pollutants come mainly from point sources, followed by surface sources. Ecological water consumption is also one of the reasons for the eutrophication of water bodies.