Aquatic Sciences

, Volume 74, Issue 2, pp 241–253 | Cite as

Assessing a decade of phosphorus management in the Lake Mendota, Wisconsin watershed and scenarios for enhanced phosphorus management

  • Emily L. Kara
  • Chad Heimerl
  • Tess Killpack
  • Matthew C. Van de Bogert
  • Hiroko Yoshida
  • Stephen R. Carpenter
Research Article

Abstract

A phosphorus (P) budget was estimated for the watershed of Lake Mendota, Wisconsin, to assess the effects of nutrient management on P accumulation in the watershed soils. We estimated how nutrient management programs and legislation have affected the budget by comparing the budget for 2007 to a budget calculated for 1995, prior to implementation of the programs. Since 1995, inputs decreased from 1,310,000 to 853,000 kg P/yr (35% reduction) and accumulation decreased from 575,000 to 279,000 kg P/yr (51% reduction). Changes in P input and accumulation were attributed primarily to enhanced agricultural nutrient management, reduction in dairy cattle feed supplements and an urban P fertilizer ban. Four scenarios were investigated to determine potential impacts of additional nutrient management tactics on the watershed P budget and P loading to Lake Mendota. Elimination of chemical P fertilizer input has the greatest potential to reduce watershed P accumulation and establishment of riparian buffers has the greatest potential to prevent P loading to Lake Mendota.

Keywords

Eutrophication Lake Mendota Mass balance Nutrient management Phosphorus 

Notes

Acknowledgments

We thank Monica Turner, Jake Vander Zanden, Jim Lorman, Chris Kucharik, Dave Lewis, Bill Provencher, the participants in the UW-Madison Ecosystems Services course for thoughtful feedback on the paper. We thank them and Pete Nowak, J. Mark Powell, Dick Lathrop, Lauri Lambert, and Doug Soldat for their helpful discussion and direction.

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Copyright information

© Springer Basel AG 2011

Authors and Affiliations

  • Emily L. Kara
    • 1
  • Chad Heimerl
    • 2
  • Tess Killpack
    • 3
  • Matthew C. Van de Bogert
    • 4
  • Hiroko Yoshida
    • 5
  • Stephen R. Carpenter
    • 4
  1. 1.Department of Civil and Environmental EngineeringUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Department of Civil and Environmental EngineeringUniversity of Wisconsin-MadisonMadisonUSA
  3. 3.Department of ZoologyUniversity of Wisconsin-MadisonMadisonUSA
  4. 4.Center for LimnologyUniversity of Wisconsin-MadisonMadisonUSA
  5. 5.Nelson Institute for Environmental StudiesUniversity of Wisconsin-MadisonMadisonUSA

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