Abstract
Resuspension of benthic phosphorus (P) often constitutes a high percentage of the annual P flux in lowland rivers. To study P entrainment at controlled shear velocity (u*) sediment from lowland River Spree of slower flowing (0.1–0.3 m s−1) stretch Kossenblatt (KOB) and of faster flowing (0.5–0.7 m s−1) stretch Freienbrink (FRB) was incubated in a microcosm at incrementally enhanced u* (0.34–1.9 cm s−1). Particle and P entrainment rates as well as the number of particle-associated bacteria of fine-grained mud-like KOB sediment were much higher (16.7 g m−2 h−1, 104.9 mg P m−2 h−1, 15.47 106 cells ml−1) than those (4.3 g m−2 h−1, 2.1 mg P m−2 h−1, 3.06 106 cells ml−1) of coarser sandy FRB sediment. The microcosm used so far in marine research is suited to compare riverine resuspension suggesting the lower u* the more particles are deposited and the more P can be retained (KOB ≫ FRB). Conversely, correspondingly more and easier particulate P and bacteria can again be remobilised (KOB ≫ FRB) if u* increases. The general relationship found for u* and the entrainment of particulate P and bacteria as well as their decelerated and selective deposition where bacteria may stay longer in the water implies a temporarily enhanced P bioavailability, turnover and subsequent P transformations.
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Abbreviations
- C0 :
-
drag coefficient 1 m above bottom
- FRB:
-
Freienbrink (sampling station at River Spree, mineral sediment)
- KOB:
-
Kossenblatt (sampling station at River Spree, organic sediment)
- P:
-
phosphorus
- ρ :
-
[rho] density of the fluid
- SPM:
-
suspended particulate matter
- SRP:
-
soluble reactive phosphorus
- τ :
-
[tau] bottom shear stress
- TP:
-
total phosphorus
- TPSPM :
-
total phosphorus content of suspended particulate matter
- u 0 :
-
flow velocity 1 m above bottom
- u mean :
-
mean flow velocity
- u* :
-
shear (friction) velocity
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Acknowledgements
We thank B. Schütze and T. Hintze for technical assistance, and A. Lüder, C. Herzog and M. Reiche (all IGB Berlin) for assistance with various analysis. H.-P. Kozerski (IGB Berlin) is acknowledged for a colleague review. Thanks also to three anonymous reviewers for their helpful comments. The study was financially supported by the Federal Ministry of Education and Research (BMBF, FKZ 02WF0469).
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Kleeberg, A., Hupfer, M. & Gust, G. Phosphorus Entrainment Due to Resuspension in a Lowland River, Spree, NE Germany – A Laboratory Microcosm Study. Water Air Soil Pollut 183, 129–142 (2007). https://doi.org/10.1007/s11270-007-9362-8
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DOI: https://doi.org/10.1007/s11270-007-9362-8