Experiences with reducing point sources of phosphorus to lakes |
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Authors: | Peter Cullen Curt Forsberg |
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Affiliation: | (1) Water Research Centre, Canberra College of Advanced Education, P.O.Box 1, 2616 Belconnen, A.C.T., Australia;(2) Institute of Limnology, University of Uppsala, Box 557, S-751 22 Uppsala, Sweden |
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Abstract: | Experiences over the last 25 years have demonstrated that eutrophication can be reversed, and that phosphorus is most often the nutrient through which control should be exerted.The reduction of the external load of phosphorus to a eutrophic lake is a necessary condition for lake restoration, but may not in itself be sufficient. Three main response patterns to a reduction in external load are identified. These include reduction in lake phosphorus that leads to sufficient reduction in chlorophyll to change the trophic category, to make the lakes less eutrophic or have small or no effect. The factors that determine the actual response are discussed.It is clear that interventions to restore eutrophic lakes have not always given the results expected. Limnological studies are necessary for well-grounded predictions. |
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Keywords: | eutrophication lake restoration recovery phosphorus chlorophyll |
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