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Variability in fluvial suspended and streambed sediment phosphorus fractions among small agricultural streams

Sandström, Sara and Futter, Martyn and O'Connell, David W. and Lannergård, Emma and Rakovic, Jelena and Kyllmar, Katarina and Gill, Laurence W. and Djodjic, Faruk (2021). Variability in fluvial suspended and streambed sediment phosphorus fractions among small agricultural streams. Journal of Environmental Quality. 50 , 612-626
[Research article]

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Abstract

Agriculture is a major source of sediment and particulate phosphorus (P) inputs to freshwaters. Distinguishing between P fractions in sediment can aid in understanding its eutrophication risk. Although streams and rivers are important parts of the P cycle in agricultural catchments, streambed sediment and especially fluvial suspended sediment (FSS) and its P fractions are less studied. To address this knowledge gap, seasonal variations in FSS P fractions and their relation to water quality and streambed sediment were examined in three Swedish agricultural headwater catchments over 2 yr. Sequential fractionation was used to characterize P fractions in both streambed sediment and FSS. All catchments had similar annual P losses (0.4-0.8 kg ha(-1)), suspended solids (124-183 mg L-1), and FSS total P concentrations (1.15-1.19 mg g(-1)). However, distribution of P fractions and the dominant P fractions in FSS differed among catchments (p < .05), which was most likely dependent on differences in catchment geology, clay content, external P sources, and flow conditions. The most prominent seasonal pattern in all catchments was found for iron-bound P, with high concentrations during low summer flows and low concentrations during winter high flows. Streambed sediment P fractions were in the same concentration ranges as in FSS, and the distribution of the fractions differed between catchments. This study highlights the need to quantify P fractions, not just total P in FSS, to obtain a more complete understanding of the eutrophication risk posed by agricultural sediment losses.

Authors/Creators:Sandström, Sara and Futter, Martyn and O'Connell, David W. and Lannergård, Emma and Rakovic, Jelena and Kyllmar, Katarina and Gill, Laurence W. and Djodjic, Faruk
Title:Variability in fluvial suspended and streambed sediment phosphorus fractions among small agricultural streams
Series Name/Journal:Journal of Environmental Quality
Year of publishing :2021
Volume:50
Page range:612-626
Number of Pages:15
Publisher:WILEY
ISSN:0047-2425
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 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)
URN:NBN:urn:nbn:se:slu:epsilon-p-111671
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111671
Additional ID:
Type of IDID
DOI10.1002/jeq2.20210
Web of Science (WoS)000637331400001
ID Code:25526
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:28 Sep 2021 07:25
Metadata Last Modified:28 Sep 2021 07:31

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