, Volume 215, Issue 3, pp 231–241 | Cite as

Effects of alum treatment on phosphorus dynamics in a north-temperate reservoir

  • William F. James
  • John W. Barko
  • William D. Taylor


Eau Galle Reservoir, Wisconsin, was treated with a hypolimnetic dose of aluminum sulfate (alum) in 1986 to diminish excessive phytoplankton production associated with high phosphorus loading from anoxic, profundal sediments. Prior to treatment, internal total phosphorus (TP) loading was 3 to 6 times greater than external TP loading during summer stratification. Periodic increases in epilimnetic TP mass and chlorophylla concentrations closely corresponded with elevated internal TP loading. For one year following treatment, internal TP loading and concentrations of soluble reactive phosphorus (SRP) in the hypolimnion were substantially reduced. However, abnormally high external TP loading during the stratified period of 1986 resulted in high TP mass and chlorophylla in the epilimnion. During the summers of 1987 and 1988, effects of alum treatment on internal TP loading were essentially negated, and epilimnetic TP mass and chlorophylla remained unchanged from pretreatment years. Multiple potential sources of P input to this reservoir make it difficult to reduce epilimnetic P and phytoplankton growth.

Key words

aluminum sulfate external P loading internal P loading phosphorus chlorophyll reservoirs 


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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • William F. James
    • 1
  • John W. Barko
    • 1
  • William D. Taylor
    • 1
  1. 1.Environmental Laboratory, Waterways Experiment StationVicksburgUSA

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