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Particulate phosphorus and suspended solids losses from small agricultural catchments: Links to stream and catchment characteristics

Sandström, Sara and Futter, Martyn and Kyllmar, Katarina and Bishop, Kevin and O'Connell, David W. and Djodjic, Faruk (2020). Particulate phosphorus and suspended solids losses from small agricultural catchments: Links to stream and catchment characteristics. Science of the Total Environment. 711
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Abstract

Excessive phosphorus (P) inputs from agriculture are well established as a contributor to freshwater eutrophication. Decreasing these inputs is an important step in improving the ecological state of impaired waters. Particulate P (PP) is a significant contributor to diffuse P inputs in agricultural catchments. Identifying the main correlates for PP losses is an important step in reducing these inputs. However, there are few studies of long term temporal and spatial dynamics of PP in agricultural streams. Here, we investigate the relative importance of hydrology, catchment characteristics and geochemistry on PP concentrations and fluxes in agricultural headwaters. We evaluate long-term monitoring data from eleven small (<35 km(2)) Swedish catchments with at least seven years of measured flow and flow proportional water quality sampling. Using parametric and non-parametric regression together with principal components analysis (PCA), we identify in-stream and catchment variables relevant for predicting PP concentrations, e.g., suspended solids concentrations (SS), soil texture and average catchment soil P content, measured as ammonium lactate/acetic acid extractable P (P-AL). We show that PP is primarily correlated to SS concentrations, which in turn are correlated to average clay content and land use. However, the SS:PP relationships differ between catchments. No correlation between PP concentrations in the stream and soil P content was found. An increasing clay content decreases the slope of the relationship between SS and PP, i.e., in catchments with higher clay content, less PP is transported per unit SS. The PP/SS ratio increased significantly (p < 0.05) over time in four catchments, despite limited changes in SS or PP concentrations. Our study highlights the importance of long time series since the enrichment of P on SS in the streams is only detected when using long term monitoring data. (C) 2019 The Author(s). Published by Elsevier B.V.

Authors/Creators:Sandström, Sara and Futter, Martyn and Kyllmar, Katarina and Bishop, Kevin and O'Connell, David W. and Djodjic, Faruk
Title:Particulate phosphorus and suspended solids losses from small agricultural catchments: Links to stream and catchment characteristics
Year of publishing :2020
Volume:711
Number of Pages:12
ISSN:0048-9697
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Keywords:Particulate phosphorus, Environmental monitoring, Agricultural streams, Suspended solids, Eutrophication, Headwaters
URN:NBN:urn:nbn:se:slu:epsilon-p-104086
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-104086
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2019.134616
Web of Science (WoS)000509344700098
ID Code:16672
Deposited By: SLUpub Connector
Deposited On:06 Mar 2020 09:15
Metadata Last Modified:09 Sep 2020 14:17

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