EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 2:30 PM - 2:45 PM | PHOSPHORUS RETENTION AND RELEASE BY RESERVOIRS OF A EUTROPHIC RIVER | 302B
PHOSPHORUS RETENTION AND RELEASE BY RESERVOIRS OF A EUTROPHIC RIVER
Reservoirs can be either net sinks or sources of phosphorus (P) in river systems. We examined summer P balances in two reservoirs, Morrow Lake and Lake Allegan, on the Kalamazoo River in Michigan (USA). These run-of-river reservoirs are amenable to mass balances because they have single inflows and essentially no other P inputs. During the summer, Morrow Lake fluctuated between being a net source of P (8 of 16 years) and a net sink (8 of 16 years), and was a source of P when mean water residence time exceeded ~3.5 days. Lake Allegan was a source of P during the summer and, for one year when samples were collected all year, a sink during the winter; P inflow was similar to outflow on an annual basis. During the summer, nitrogen may have limited algal growth, thereby reducing P uptake and further contributing to net P release. The effects of these reservoirs on P transport are controlled by water residence time and the balance between sedimentation of particulate P and sediment P release, with the latter important at low flows and warm temperatures.
- C10 Biogeochemistry
- C36 Water Resource Management
- C06 Large River Ecology
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Presenters/Authors
Sarah S. Roley
(), Michigan State University, roleysar@msu.edu;
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Dustin Kincaid
(), W.K. Kellogg Biological Station and Department of Integrative Biology, Michigan State University, kincai32@msu.edu;
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Stephen K. Hamilton
(), Michigan State University, hamilton@kbs.msu.edu;
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