Assessing a decade of phosphorus management in the Lake Mendota, Wisconsin watershed and scenarios for enhanced phosphorus management |
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| Authors: | Emily L Kara Chad Heimerl Tess Killpack Matthew C Van de Bogert Hiroko Yoshida Stephen R Carpenter |
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| Institution: | (1) Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 1550 Linden Dr., Madison, WI 53706, USA;(2) Department of Civil and Environmental Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA;(3) Department of Zoology, University of Wisconsin-Madison, 1630 Linden Dr., Madison, WI 53706, USA;(4) Center for Limnology, University of Wisconsin-Madison, 680 N. Park St., Madison, WI 53706, USA;(5) Nelson Institute for Environmental Studies, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA |
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| 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. |
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