@article{Plach-2018-Supply,
title = "Supply and Transport Limitations on Phosphorus Losses from Agricultural Fields in the Lower Great Lakes Region, Canada",
author = "Plach, Janina M. and
Macrae, Merrin L. and
Ali, Genevieve and
Brunke, R. and
English, Michael and
Ferguson, Gabrielle and
Lam, W.V. and
Lozier, Tatianna M. and
McKague, Kevin and
O{'}Halloran, I. P. and
Opolko, Gilian and
Esbroeck, Christopher J. Van",
journal = "Journal of Environmental Quality, Volume 47, Issue 1",
volume = "47",
number = "1",
year = "2018",
publisher = "Wiley",
url = "https://gwf-uwaterloo.github.io/gwf-publications/G18-100001",
doi = "10.2134/jeq2017.06.0234",
pages = "96--105",
abstract = "Phosphorus (P) mobilization in agricultural landscapes is regulated by both hydrologic (transport) and biogeochemical (supply) processes interacting within soils; however, the dominance of these controls can vary spatially and temporally. In this study, we analyzed a 5-yr dataset of stormflow events across nine agricultural fields in the lower Great Lakes region of Ontario, Canada, to determine if edge-of-field surface runoff and tile drainage losses (total and dissolved reactive P) were limited by transport mechanisms or P supply. Field sites ranged from clay loam, silt loam, to sandy loam textures. Findings indicate that biogeochemical processes (P supply) were more important for tile drain P loading patterns (i.e., variable flow-weighted mean concentrations ([]) across a range of flow regimes) relative to surface runoff, which trended toward a more chemostatic or transport-limited response. At two sites with the same soil texture, higher tile [] and greater transport limitations were apparent at the site with higher soil available P (STP); however, STP did not significantly correlate with tile [] or P loading patterns across the nine sites. This may reflect that the fields were all within a narrow STP range and were not elevated in STP concentrations (Olsen-P, {\mbox{$\leq$}}25 mg kg). For the study sites where STP was maintained at reasonable concentrations, hydrology was less of a driving factor for tile P loadings, and thus management strategies that limit P supply may be an effective way to reduce P losses from fields (e.g., timing of fertilizer application).",
}
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<abstract>Phosphorus (P) mobilization in agricultural landscapes is regulated by both hydrologic (transport) and biogeochemical (supply) processes interacting within soils; however, the dominance of these controls can vary spatially and temporally. In this study, we analyzed a 5-yr dataset of stormflow events across nine agricultural fields in the lower Great Lakes region of Ontario, Canada, to determine if edge-of-field surface runoff and tile drainage losses (total and dissolved reactive P) were limited by transport mechanisms or P supply. Field sites ranged from clay loam, silt loam, to sandy loam textures. Findings indicate that biogeochemical processes (P supply) were more important for tile drain P loading patterns (i.e., variable flow-weighted mean concentrations ([]) across a range of flow regimes) relative to surface runoff, which trended toward a more chemostatic or transport-limited response. At two sites with the same soil texture, higher tile [] and greater transport limitations were apparent at the site with higher soil available P (STP); however, STP did not significantly correlate with tile [] or P loading patterns across the nine sites. This may reflect that the fields were all within a narrow STP range and were not elevated in STP concentrations (Olsen-P, łeq25 mg kg). For the study sites where STP was maintained at reasonable concentrations, hydrology was less of a driving factor for tile P loadings, and thus management strategies that limit P supply may be an effective way to reduce P losses from fields (e.g., timing of fertilizer application).</abstract>
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%0 Journal Article
%T Supply and Transport Limitations on Phosphorus Losses from Agricultural Fields in the Lower Great Lakes Region, Canada
%A Plach, Janina M.
%A Macrae, Merrin L.
%A Ali, Genevieve
%A Brunke, R.
%A English, Michael
%A Ferguson, Gabrielle
%A Lam, W. V.
%A Lozier, Tatianna M.
%A McKague, Kevin
%A O’Halloran, I. P.
%A Opolko, Gilian
%A Esbroeck, Christopher J. Van
%J Journal of Environmental Quality, Volume 47, Issue 1
%D 2018
%V 47
%N 1
%I Wiley
%F Plach-2018-Supply
%X Phosphorus (P) mobilization in agricultural landscapes is regulated by both hydrologic (transport) and biogeochemical (supply) processes interacting within soils; however, the dominance of these controls can vary spatially and temporally. In this study, we analyzed a 5-yr dataset of stormflow events across nine agricultural fields in the lower Great Lakes region of Ontario, Canada, to determine if edge-of-field surface runoff and tile drainage losses (total and dissolved reactive P) were limited by transport mechanisms or P supply. Field sites ranged from clay loam, silt loam, to sandy loam textures. Findings indicate that biogeochemical processes (P supply) were more important for tile drain P loading patterns (i.e., variable flow-weighted mean concentrations ([]) across a range of flow regimes) relative to surface runoff, which trended toward a more chemostatic or transport-limited response. At two sites with the same soil texture, higher tile [] and greater transport limitations were apparent at the site with higher soil available P (STP); however, STP did not significantly correlate with tile [] or P loading patterns across the nine sites. This may reflect that the fields were all within a narrow STP range and were not elevated in STP concentrations (Olsen-P, łeq25 mg kg). For the study sites where STP was maintained at reasonable concentrations, hydrology was less of a driving factor for tile P loadings, and thus management strategies that limit P supply may be an effective way to reduce P losses from fields (e.g., timing of fertilizer application).
%R 10.2134/jeq2017.06.0234
%U https://gwf-uwaterloo.github.io/gwf-publications/G18-100001
%U https://doi.org/10.2134/jeq2017.06.0234
%P 96-105
Markdown (Informal)
[Supply and Transport Limitations on Phosphorus Losses from Agricultural Fields in the Lower Great Lakes Region, Canada](https://gwf-uwaterloo.github.io/gwf-publications/G18-100001) (Plach et al., GWF 2018)
ACL
- Janina M. Plach, Merrin L. Macrae, Genevieve Ali, R. Brunke, Michael English, Gabrielle Ferguson, W.V. Lam, Tatianna M. Lozier, Kevin McKague, I. P. O’Halloran, Gilian Opolko, and Christopher J. Van Esbroeck. 2018. Supply and Transport Limitations on Phosphorus Losses from Agricultural Fields in the Lower Great Lakes Region, Canada. Journal of Environmental Quality, Volume 47, Issue 1, 47(1):96–105.
