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Cited by 28Soil and Water Nutrient DynamicsAquatic Ecosystems and Phytoplankton DynamicsPhosphorus and nutrient management

Phosphorus flux from wetland ditch sediments

Hill, C.R., Robinson, J.S.·2012·Science of The Total Environment
DOI 10.1016/j.scitotenv.2012.06.109
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Abstract

The accumulation of phosphorus (P) in the bottom sediment of field drainage ditches poses a threat to the ecology both of the ditch water and downstream water courses. We investigated the amounts, forms and internal loading of sediment-bound P along two drainage ditches that regulate water levels in a basin fen (~200 ha) supporting a mixture of restored wetland and drained agricultural fields. Water levels in the Lady's Drove Rhyne are currently managed to enhance the biodiversity of the wetland (Catcott Lows Reserve - an area formerly cultivated for arable crop production); whereas, the East Ditch is managed to drain adjoining land that remains under arable and livestock production. Laboratory-based chemical fractionation schemes were used to characterise the forms and potential mobility of the sediment-bound P, whilst pore-water equilibrators were employed in situ to evaluate the diffusive flux of P through the sediment-water column, and to characterise the corresponding redox conditions. Along both ditches, sediment pore-water profiles indicated conditions ranging from weakly to very reducing conditions with increasing depth, and net fluxes of P from the sediment to overlying water. P flux values ranged from 0.33 to 1.30 mg m(-2) day(-1). Both the degree of P saturation (DPS) of the sediment and NaOH extractable (Fe/Al-bound) P correlated significantly (P<0.05) with P flux. Both in the wetland and agricultural ditches, by far the highest values for P flux were recorded at sites closest to points of drainage water entry from the corresponding, adjoining land. Although the P flux data were obtained from only a single sampling event, this study highlights the contribution of historical as well as ongoing agricultural land use on the sustained elevated P status of ditch sediments in lowland catchments.

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  • Recovery timescales from nutrient and other forms of pollution are often difficult to predict because of legacy effects.

    “Recovery timescales from nutrient and other forms of pollution are often difficult to predict because of legacy effects, whereby nutrients stored in sediments can be mobilized under certain physical and chemical conditions [144][145][146] or stored long-term, resulting in slow response times to changed nutrient loads 132,147 .”

    From Lines in the landscape (2025) · cites this paper as [145]

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Authors
Hill, C. R., & Robinson, J. S.
Affiliations
University of Reading (GB)
Corresponding author
Robinson, J.S.
ORCID
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2012-10
Volume
437
Pages
315-322
ISSN
0048-9697 (ISSN-L)
DOI
10.1016/j.scitotenv.2012.06.109
OpenAlex
W1981781756
Cited by
28
References
42
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 2 · 2016: 5 · 2015: 2 · 2014: 2 · 2013: 1
FWCI
1.27
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Reading (JSR)
  • PhD studentship (CRH) from the Natural Environment Research Council, UK
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
  • Physical Sciences › Environmental Science › Waste Management and Disposal › Phosphorus and nutrient management
Keywords
phosphorus flux, internal phosphorus loading, sediment-bound phosphorus, redox conditions, phosphorus saturation, restored wetlands, fens, eutrophication
MeSH terms
Agriculture, England, Environmental Monitoring, Phosphorus, Water Pollutants, Chemical, Geologic Sediments, Wetlands

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