The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments

Simon D. Clarendon, David M. Weaver, Peter M. Davies, Neil A. Coles

Research output: Contribution to journalArticle

Abstract

Purpose In many streams worldwide including those on the south coast of Western Australia (WA), sediments of the >2-mm fraction often contribute up to 50% of the streambed. However, most analysis and interpretation of sediment chemistry, including phosphorus (P), is conducted on the 2-mm fraction to P retention and release in sandy-gravely streams.

Material and methods Sediment samples were collected from streams in agricultural catchments, and P retention and release by the 2-mm (typically lateritic; iron rich) sediment fractions were examined using fluvarium and batch experiments. Phosphorus sorbed by sediment was estimated on a mass (mg P kg(-1)) and area basis (mg P m(-2)).

Results and discussion Phosphorus sorption measurements suggested that mineralogy as well as particle size were important factors influencing P retention by stream sediments. Stream sediments retained approximately 30% of added P. In a desorption phase, approximately 8% of the retained P was released into stream water.

Conclusions Stream sediments in south western WA appear to be net immobilisers of P, retaining more P than they release, dependent on the stream P concentration. Exclusion of the >2-mm fraction when determining stream sediment P dynamics may therefore underestimate whole stream sediment P retention and release.

Original languageEnglish
Pages (from-to)2624-2633
Number of pages10
JournalJournal of Soils and Sediments
Volume19
Issue number5
DOIs
Publication statusPublished - May 2019

Cite this

Clarendon, Simon D. ; Weaver, David M. ; Davies, Peter M. ; Coles, Neil A. / The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments. In: Journal of Soils and Sediments. 2019 ; Vol. 19, No. 5. pp. 2624-2633.
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abstract = "Purpose In many streams worldwide including those on the south coast of Western Australia (WA), sediments of the >2-mm fraction often contribute up to 50{\%} of the streambed. However, most analysis and interpretation of sediment chemistry, including phosphorus (P), is conducted on the 2-mm fraction to P retention and release in sandy-gravely streams.Material and methods Sediment samples were collected from streams in agricultural catchments, and P retention and release by the 2-mm (typically lateritic; iron rich) sediment fractions were examined using fluvarium and batch experiments. Phosphorus sorbed by sediment was estimated on a mass (mg P kg(-1)) and area basis (mg P m(-2)).Results and discussion Phosphorus sorption measurements suggested that mineralogy as well as particle size were important factors influencing P retention by stream sediments. Stream sediments retained approximately 30{\%} of added P. In a desorption phase, approximately 8{\%} of the retained P was released into stream water.Conclusions Stream sediments in south western WA appear to be net immobilisers of P, retaining more P than they release, dependent on the stream P concentration. Exclusion of the >2-mm fraction when determining stream sediment P dynamics may therefore underestimate whole stream sediment P retention and release.",
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The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments. / Clarendon, Simon D.; Weaver, David M.; Davies, Peter M.; Coles, Neil A.

In: Journal of Soils and Sediments, Vol. 19, No. 5, 05.2019, p. 2624-2633.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The influence of particle size and mineralogy on both phosphorus retention and release by streambed sediments

AU - Clarendon, Simon D.

AU - Weaver, David M.

AU - Davies, Peter M.

AU - Coles, Neil A.

PY - 2019/5

Y1 - 2019/5

N2 - Purpose In many streams worldwide including those on the south coast of Western Australia (WA), sediments of the >2-mm fraction often contribute up to 50% of the streambed. However, most analysis and interpretation of sediment chemistry, including phosphorus (P), is conducted on the 2-mm fraction to P retention and release in sandy-gravely streams.Material and methods Sediment samples were collected from streams in agricultural catchments, and P retention and release by the 2-mm (typically lateritic; iron rich) sediment fractions were examined using fluvarium and batch experiments. Phosphorus sorbed by sediment was estimated on a mass (mg P kg(-1)) and area basis (mg P m(-2)).Results and discussion Phosphorus sorption measurements suggested that mineralogy as well as particle size were important factors influencing P retention by stream sediments. Stream sediments retained approximately 30% of added P. In a desorption phase, approximately 8% of the retained P was released into stream water.Conclusions Stream sediments in south western WA appear to be net immobilisers of P, retaining more P than they release, dependent on the stream P concentration. Exclusion of the >2-mm fraction when determining stream sediment P dynamics may therefore underestimate whole stream sediment P retention and release.

AB - Purpose In many streams worldwide including those on the south coast of Western Australia (WA), sediments of the >2-mm fraction often contribute up to 50% of the streambed. However, most analysis and interpretation of sediment chemistry, including phosphorus (P), is conducted on the 2-mm fraction to P retention and release in sandy-gravely streams.Material and methods Sediment samples were collected from streams in agricultural catchments, and P retention and release by the 2-mm (typically lateritic; iron rich) sediment fractions were examined using fluvarium and batch experiments. Phosphorus sorbed by sediment was estimated on a mass (mg P kg(-1)) and area basis (mg P m(-2)).Results and discussion Phosphorus sorption measurements suggested that mineralogy as well as particle size were important factors influencing P retention by stream sediments. Stream sediments retained approximately 30% of added P. In a desorption phase, approximately 8% of the retained P was released into stream water.Conclusions Stream sediments in south western WA appear to be net immobilisers of P, retaining more P than they release, dependent on the stream P concentration. Exclusion of the >2-mm fraction when determining stream sediment P dynamics may therefore underestimate whole stream sediment P retention and release.

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KW - Surface area

KW - PHOSPHATE SORPTION

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KW - PREVIOUS ADDITIONS

KW - DRAINAGE DITCHES

KW - WATER-QUALITY

KW - IRON-OXIDES

KW - SOIL

KW - MANAGEMENT

KW - ADSORPTION

KW - CATCHMENTS

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DO - 10.1007/s11368-019-02267-w

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JO - Journal of Soils and Sediments: protection, risk assessment and remediation

JF - Journal of Soils and Sediments: protection, risk assessment and remediation

SN - 1439-0108

IS - 5

ER -