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Sedimentary phosphorus accumulation and distribution in the continuum of three cascade dams (Creuse River, France)

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Abstract

Dam construction leads to both sediment discontinuities and the creation of internal phosphorus (P) loads in reservoirs capable of supporting eutrophication. Today, majority of large rivers are dammed and numerous of these infrastructures are constructed in cascade. However, few studies focus on the cumulative effect of the presence of dam on sediment P mobility and bioavailability in downstream reservoirs and rivers parts or throughout the continuum. The influence of three cascade dams has been studied herein on the sedimentary P distribution in surface bed sediments along a 17-km fluvial continuum of the Creuse River (Massif Central, France). The sediments (17 samples) were analyzed for their physical (grain size, specific surface area) and chemical (pH, contents of P, Fe, Al, Ca, Mn, organic matter (OM), and P fractionation) characteristics. Results indicated an amount of P 3 to 7 times higher in dam sediments (1.59 ± 0.51 mgP/g DW) than in free-flowing river sections (0.27 ± 0.11 mgP/g DW). Unexpectedly, sedimentary TP content did not decrease from the first to the third reservoir. The spatial variations of sediment characteristics between river and reservoirs were correlated with the retention of particles sized under 200 μm within the reservoirs. In reservoir sediment, P was mainly associated with the ascorbate fraction (P associated with the redox-sensitive Fe/Mn precipitates). Inside each dam reservoir, longitudinal variations of the sedimentary P distribution were mainly due to the increase of amorphous Fe precipitate content accumulated in fine sediments toward the dam, as characterized by a low Fe-Asc/P-Asc molar ratio. In the river sections, P distribution (mainly associated with HCl and ascorbate fractions) was not significantly influenced by cascade dams.

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  • 21 April 2020

    The missing Electronic Supplementary Material in the original paper is included in this paper.

Abbreviations

P:

Phosphorus

DIP:

Dissolved inorganic P

DOP:

Dissolved organic P

LQ:

Limit of quantification

OM:

Organic matter

TP:

Total P

P-Asc:

P extracted by ascorbate solution

DB:

Dithionite bicarbonate

P-DB:

P extracted by DB solution

rP-NaOH:

Reactive P extracted by NaOH solution

nrP-NaOH:

Non-reactive P extracted by NaOH solution

P-Res:

Residual P extracted by concentrated HCl solution

Ss:

Specific surface area

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Acknowledgments

The authors would like to thank François Bordas, Patrice Fondaneche, Karine Cleries, Emmanuelle Ducloux, and Tim Kestens for their valuable contributions to this study. This work has been supported by a grant from the Research Chair “Large Dam Reservoirs and Water Quality” (http://fondation.unilim.fr/chaire-grqe), which is fully funded by the EDF utility company and the University of Limoges Partnership Foundation.

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Correspondence to Marion Rabiet.

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Responsible editor: Philippe Garrigues

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Rapin, A., Rabiet, M., Mourier, B. et al. Sedimentary phosphorus accumulation and distribution in the continuum of three cascade dams (Creuse River, France). Environ Sci Pollut Res 27, 6526–6539 (2020). https://doi.org/10.1007/s11356-019-07184-6

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  • DOI: https://doi.org/10.1007/s11356-019-07184-6

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