摘要
东湖位于长江南岸的湖北省武汉市武昌东北郊,是长江中下游湖群中的一个中型浅水湖泊。二十多年来,尤其近十年内,由于东湖汇水区域上居住的人口密度不断提高和工农业生产的迅速发展,大量生活污水、工业废水以及农田和其它地表径流等给东湖带入了大量的营养物质,导致浮游植物不仅在数量上成倍增长,而且在群落结构上也发生了明显的变化。
The annual input of the total dissolved nitrogen(N)was 536.3 t,corresponding to an average loading per unit area of 19.22 g/m^(2).a.The annual input of total dissolved phosphate(PO_(4)^(3-))was 87.8 t,corresponding to an average loading per unit area of 3.15 g/m^(2).a.Of the nitrogen loading,59.2%was derived from domestic sewage and industrial wastewa-ter,34.0%from terrestrial run-off and 6.8%from precipitation.Of the phosphorus loading,74.7%come from domestic sewage and industrial wastewater,24.2%from terrestrial run-off and only 1.1%from precipitation.The total outputs of nitrogen and phosphorus were 213.1 and 20.1 t/a respectively.90.8%of the nitrogen and 51.7%of the phosphorus were removed through water supply,while 9.2%of the nitrogen and 48.3%of the phosphorus were removed through fish yielding and macrophyte harvesting.The differences between the influx and efflux of the nutrients were 323.2 t N/a and 67.7 t P/a,so that 60.3%N and 77,1%P of the total annual inputs were presumed to have been accumulated in the Jake.Based on the results,important factors causing eutrophication in Lake Donghu is given.Suggestions of measures to control lake eutrophication are presented as well.
作者
张水元
刘衢霞
黄耀桐
Zhang Shuiyuan;Liu Quxia;Huang Yaotong(Institute of Hydrobiology,Academia Sinica,Wuchang)
出处
《海洋与湖沼》
1984年第3期203-213,共11页
Oceanologia Et Limnologia Sinica
