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Assessment of internal phosphorus loading in Spring Lake, MI

"The goal of this study is to determine the importance of sediment  phosphorus (P) in stimulating algal blooms in Spring Lake, and the  effectiveness of aluminum in reducing the release of P from the sediments.    Spring Lake is hypereuthropic and impacted by high phosphorus levels.   The excessive phosphorus and other nutrients cause algal blooms,  which degrade the recreational and ecological health of the lake.   Historically, field measurements of phosphorus concentration in  watersheds have concentrated on the "external" loading of phosphorus  (from tributaries, runoff, and groundwater).  Phosphorus being  released by the sediments at the bottom of a waterbody, or "internal"  loading, has received less attention.  However, in highly eutrophic  lakes such as Spring Lake, internal loading can account for  substantial amount of the total phosphorus load.  The application of a  chemical, such as alum (aluminum sulfate), can limit internal loading  by binding the phosphorus to the sediments.  Alum was applied to  Spring Lake in late 2  5.  Our present study will assess the  effectiveness of the alum application by comparing new data to  previous studies conducted in 2  3 and 2  4.    Sediment cores will be collected from four sites in Spring Lake and  incubated/sampled for a month under aerobic and anaerobic conditions  to determine internal P loading rates.  After the completion of the  internal loading measurements, sediment cores will be fractionated to  assess the amount of P bound to Fe/A1 and Ca/Mg in the sediments.   Macroinvertebrates will also be identified and counted, to determine  if the alum has influenced their abundance and community composition."

Status
In progress
Type
Project
Start Date
End Date
Researchers
Alan SteinmanPrincipal Investigator
Associated with 9 projects
Rick RediskeResearcher
Associated with 7 projects
Agencies
Spring Lake-Lake Board $ 0.00USDEstimates

Funding 2 projects for a total of $0.00
Scope of Study
Field Investigation
Lake Basin Connecting Channels
Lake Michigan
Annex Numbers
Control of Phosphorus
Research & Development
Annex 17
Physical and transformational processes affecting delivery of pollutants

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