Historical trends affecting accumulation of sediment and phosphorus in Lake Pepin,upper Mississippi River,USA |
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Authors: | David J Mulla Adam C Sekely |
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Institution: | (1) Department of Soil, Water and Climate, University of Minnesota, St Paul, MN 55108, USA |
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Abstract: | This study was conducted to collect historical land use information that would help explain the historical patterns in accumulation
of sediment and phosphorus in Lake Pepin documented by Engstrom et al. (J Paleolimnol, this issue). A wide range of historical factors including cropping systems, phosphorus applications from fertilizer and manure, human
and animal populations, river flows and phosphorus discharges from waste water treatment plants were studied using statistical
methods. Results showed that sediment losses from the Minnesota River basin are significantly correlated with historical increases
in river flows, row crop production acreage and basin population. Total phosphorus accumulations in the sediments of Lake
Pepin are significantly correlated with increased phosphorus discharges from metropolitan area wastewater treatment plants,
and increases in row crop acreage and river flows. Total phosphorus inflows to Lake Pepin are significantly correlated with
increases in river flows, row crop acreage and phosphorus fertilizer applied to agricultural lands.
This is one of eight papers dedicated to the “Recent Environmental History of the Upper Mississippi River” published in this
special issue of the Journal of Paleolimnology. D. R. Engstrom served as guest editor of the special issue. |
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Keywords: | Lake Pepin Land use change Phosphorus Sediment Trend analysis Water quality |
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