RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (2): 180-.

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REMOVAL EFFECTS OF PERIPHYTON ON NITROGEN AND PHOSPHORUS IN THE EUTROPHIC WATER BODY

SONG Yuzhi1| QIN Boqiang2| GAO Guang2   

  1. 1.College of Enviromental Science and Engineering| Nanjing University of Science Information &|Technology| Nanjing 210044| China; 
    2.Nanjing Institute of Geography and Limnology| Chinese Academy of Sciences| Nanjing 210008| China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-02-20

Abstract:

To research purifying effects of periphyton on nitrogen and phosphorus of the eutrophic water body,static incubation test was adopted by utilizing situ water and periphyton attached to the fishing nets paling in“863 demonstration project”submerged macrophyte restoration area of Meiliang Bay of Lake Taihu.The results showed that removal effect of periphyton on nitrogen was significant.Cumulative removal ratio of nitrogen was up to 60%,the nitrogen concentration decreased from 5 to 2 mg /L or so within two weeks.Cumulative removal ratio of nitrogen was closely related with nitrogen concentration,working time and biomass of periphyton.In the first cultivation stage,as relatively high concentration of phosphorus,phosphorus from water column was removed to a certain extent by periphyton.The end of the incubation,as low concentration of phosphorus periphyton releases phosphorus to water column instead of removal phosphorus from water,this may closely relate to the alkaline phosphatase secreted by periphyton in water body.

Key words: periphyton, cumulative removal ratio, nutrients

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