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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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
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Floodplain
Groundwater
Orthophosphorus
Phosphorus
Recharge
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description •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 (
doi_str_mv 10.1016/j.scitotenv.2018.01.035
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[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 (&lt;6m) monitoring wells established across watershed, OP concentrations ranged from &lt;0.01 to 0.58mg/l in all samples (n=147) and averaged 0.084±0.107mg/l. Groundwater OP concentrations were higher in floodplains and OP mass loading rates were approximately three times higher than in uplands. We estimated that approximately 1231kg of OP is present in floodplain groundwater and 2869kg is present in upland groundwater within the shallow groundwater zone (0–5m depth). 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[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 (&lt;6m) monitoring wells established across watershed, OP concentrations ranged from &lt;0.01 to 0.58mg/l in all samples (n=147) and averaged 0.084±0.107mg/l. Groundwater OP concentrations were higher in floodplains and OP mass loading rates were approximately three times higher than in uplands. We estimated that approximately 1231kg of OP is present in floodplain groundwater and 2869kg is present in upland groundwater within the shallow groundwater zone (0–5m depth). 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subjects Floodplain
Groundwater
Orthophosphorus
Phosphorus
Recharge
title Distribution and mass of groundwater orthophosphorus in an agricultural watershed
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