Distribution and mass of groundwater orthophosphorus in an agricultural watershed

•Groundwater orthophosphorus concentrations were higher in floodplains than in uplands.•OP loading rates beneath floodplains are approximately three times higher than in uplands.•Eight years is needed to flush out existing OP mass present in shallow groundwater.•Conservation focused on floodplain ar...

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Bibliographic Details
Published in:The Science of the total environment 2018-06, Vol.625, p.1330-1340
Main Authors: Schilling, Keith E., Streeter, Matthew T., Isenhart, Thomas M., Beck, William J., Tomer, Mark D., Cole, Kevin J., Kovar, John L.
Format: Article
Language:English
Subjects:
Floodplain
Groundwater
Orthophosphorus
Phosphorus
Recharge
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Summary:•Groundwater orthophosphorus concentrations were higher in floodplains than in uplands.•OP loading rates beneath floodplains are approximately three times higher than in uplands.•Eight years is needed to flush out existing OP mass present in shallow groundwater.•Conservation focused on floodplain areas may have disproportionately large water quality benefit. [Display omitted] Orthophosphorus (OP) is the form of dissolved inorganic P that is commonly measured in groundwater studies, but the spatial distribution of groundwater OP across a watershed has rarely been assessed. In this study, we characterized spatial patterns of groundwater OP concentrations and loading rates within the 5218ha Walnut Creek watershed (Iowa) over a two-year period. Using a network of 24 shallow (
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2018.01.035