September 5 Abstract-
"Phosphorus Dynamics in Eutrophic Lake Mendota"
September 5 View
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September 5 Roundtable
Minutes
Conclusions & Resolutions
- Lake Mendota and lakes in general respond to lower P loadings as
evidenced by reduced algal blooms.
- There is a time lag between reductions in P inputs and improvements
in water quality due to bottom sediment releasing P.
- Adequate models for evaluating impact of TP loadings on lake quality
exist for Wisconsin.
Issues to Resolve
- Relationships of bioavailable P (BAP) to dissolved reactive P (DRP)
to total P (TP) relative to water quality impacts.
- How to find long-term solutions - not short-term fixes - to the P
and water quality problem.
- The need for more intensive soil conservation practices, etc. to control
P loadings to Lake Mendota (and other lakes) as soil test P values continue
to build-up.
Research & Information Needs
- Reliable, practical, and functional techniques for measuring bio-available
P (BAP).
- Seasonal and long-term BAP parameters and measurements
- BAP as a function of landscape position
- BAP relationship to total P (TP)
- Linking the impact of management practices to seasonal P loading (i.e.
critical events).
- The fate of P in streams and rivers.
- Delivery ratios
- Forms of P
- Identify the significance of late winter/early spring P contributions
to Lake Mendota's TP load and seasonal algal blooms.
- Quantify the impact of P management practices on P loading reductions
- both TP and BAP
- Develop and/or improve methods for accurately monitoring sediment
movement on landscapes.
- Promote practices for increased water infiltration.
- Explore and educate on the consequences of improved P management.
- Economic implications
- Movement of nitrogen and pesticides with increased water infiltration
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