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Title: Whole-system phosphorus balances as a practical tool for lake management

Author: Schussler, Johanna; Baker, Lawrence A.; Chester-Jones, Hugh.;

Date: 2007

Source: Ecological Engineering. 29: 294-304.

Publication Series: Scientific Journal (JRNL)

Description: Controlling phosphorus (P) inputs to lakes remains a priority of lake management. This study develops watershed P balances for 11 recreational lakes in Minnesota. Areal P input rates to the watersheds ranged from 0.32 to 6.0 kg Pha-1 year-1 and was linearly related to the percentage of watershed in agriculture. Watershed P retention ranged from 10% to 89% of input P. Although many best management practices work to increase P retention (by trapping P in basins; reducing erosion; filtration), P retention is not sustainable indefinitely, particularly in "hot spots" such as septic leach fields and heavilymanured fields. The watershed P balance tool is a framework that can allow watershed managers to develop novel strategies for managing P. P management strategies should be developed to keep P inputs and exports in balance so that P does not accumulate; long-term P accumulation is not sustainable and can eventually lead to lake eutrophication.

Keywords: phosphorus, watershed, lake management, phosphorus accumulation, phosphorus retention

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Schussler, Johanna; Baker, Lawrence A.; Chester-Jones, Hugh. 2007. Whole-system phosphorus balances as a practical tool for lake management. Ecological Engineering. 29: 294-304.


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