Phosphorus in flowing waters

Keup, Lowell E.

doi:10.1016/0043-1354(68)90049-3

Cited by 87 publications

(33 citation statements)

References 11 publications

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“…This first-order relationship was used to calculate P assimilation in streams as a function of distance from the source (Fisher, 1977;Keup, 1968;Mulholland et al, 1990;Simmons and Cheng, 1985). The limitations of Eq.…”

Section: Field Methods: Streamsmentioning

confidence: 99%

Phosphorus Retention in Streams and Wetlands: A Review

Reddy

Kadlec

Flaig

et al. 1999

Critical Reviews in Environmental Science and Technology

843

605

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Copyright© 1999, CRC Press LLC -Files may be downloaded for personal use only. Reproduction of this material without the consent of the publisher is prohibited. 83Critical Reviews in Environmental Science and Technology, 29(1):83--146 (1999) ABSTRACT : Wetlands and streams buffer the interactions among uplands and adjacent aquatic systems. Phosphorus (P) is often the key nutrient found to be limiting in both estuarine and freshwater ecosystems. As such, the ability of wetlands and streams to retain P is key to determining downstream water quality. This article reviews the processes and factors regulating P retention in streams and wetlands and evaluates selected methodologies used to estimate P retention in these systems. Phosphorus retention mechanisms reviewed include uptake and release by vegetation, periphyton and microorganisms; sorption and exchange reactions with soils and sediments; chemical precipitation in the water column; and sedimentation and entrainment. These mechanisms exemplify the combined biological, physical, and chemical nature of P retention in wetlands and streams. Methodologies used to estimate P retention include empirical input-output analysis and mass balances, and process kinetics applied at various scales, including micro-and mesocosms to full-scale systems. Although complex numerical models are available to estimate P retention and transport, a simple understanding of P retention at the process level is important, but the overall picture provided by mass balance and kinetic evaluations are often more useful in estimating long-term P retention.

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Section: Field Methods: Streamsmentioning

confidence: 99%

Phosphorus Retention in Streams and Wetlands: A Review

Reddy

Kadlec

Flaig

et al. 1999

Critical Reviews in Environmental Science and Technology

843

605

View full text Add to dashboard Cite

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“…High flows have been shown to agitate sediments and stimulate the release of P (Johnson et al, 1976) as well as provide increased load capacity (Keup, 1968). Higher precipitation can also increase the delivery of materials from the surrounding watershed, including erosion of P-rich sediments and delivery of P through saturated soils.…”

Section: Seasonal Effect Of Reservoirs and Tributaries On Nutrient Loadsmentioning

confidence: 99%

The upside-down river: Reservoirs, algal blooms, and tributaries affect temporal and spatial patterns in nitrogen and phosphorus in the Klamath River, USA

Oliver

Dahlgren

Deas³

2014

Journal of Hydrology

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s u m m a r yThe Klamath River, located in Oregon/California of the Northwestern U.S., is highly impounded and also experiences large seasonal algal blooms and impaired water quality. We investigated nitrogen (N) and phosphorus (P) constituents for one year (2010-2011) across 193 km of the Klamath River at sites above and below reservoirs and major tributaries to determine the influence of these features on longitudinal and temporal trends in concentrations, loads, and N:P ratios. In general, the headwater lake (Upper Klamath Lake) and reservoirs appeared to be the dominant influence on water quality and nutrient dynamics in the upper river, whereas tributaries appeared to exert stronger influence in the lower river. Overall, high nutrients and poor water quality at upstream sites were ameliorated downstream, however the downstream reductions in N were much greater relative to P. Seasonality appeared to play a major role in the overall appearance and magnitude of longitudinal trends. The greatest upstream-downstream differences occurred during periods of time following large algal blooms in the upper portion of the river. Overall, the amount and composition of N appeared to be strongly driven by algal blooms and biogeochemical conditions such as low oxygen, high pH and warm temperatures in the upper portion of the river, whereas P was more strongly driven by seasonal hydrology. The spatiotemporal influence of reservoirs and tributaries on nutrient flux and nutrient ratios may have significant implications for aquatic communities and ecosystem health. Nutrient objectives should be considered when designing restoration, management, and monitoring objectives for projects involving habitat suitability for anadromous fish and potential dam removal.

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“…Rates of phosphorous removal from streams by biological activity vary from river to river, within sections of a river, and with .the seasons (Keup 1968). Phosphorous tends to be fixed to suspended matter, which is not uniformly There was a steady increase of poly-phosphate at Farm- The greater the difference between the inorganic concentrations at dawn and at noon, the greater the metabolic activity for that day.…”

Section: Phosphatementioning

confidence: 96%

The effect of human activity on the middle course of the Tualatin River, Oregon

Carter¹

2000

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A diurnal· .study of bio1~gical, chemical, and physical parameters was made on the middle course of the Tualatin , River, which drains a 1840 km 2 (711 mi 2 ) basin adjacent to metropolitan Po~t1and, Or~gon. This portion. of the river lies a1o~g land in transition of use from rural agriculture to h~ghly urbanized development.There is no nutrient loading of the river from farming practices because there was no return of water from summer, sprinkler irrigation of commercial crops. However, irrigation significantly reduces the volume of water in the river in the summers.Effluents from sewage treatment plants flowing into the tributaries that drain the highly urbanized eastern areas of the river basin are the main cause of degraded water quality and algal biomass in the lower reaches of the river. TheTualatin River above the mouth of Rock Creek is relatively unpolluted, but downstream from Rock Creek the river is highly eutrophic and during the periods of low flow 'in the summer serves as a sewage oxidation channel. In this s~ne.portion of the river there is also evidence that nitrification occurs.'Winter floods leach ni t:r.'at.e.-.ni trogen from the basin, but in the summer the possibility exists. that nitrate-nitrogen may be a 1imiti~g nutrient for a~gal productivity in the river above Hillsboro. A diurnal study was especially valuable from April to September, inclusive, when insolation and temperatures favored biol~gical activities such as photosynthesis and decomposition. From November to January little diurnal change in the water quality was found.Farming had its. greatest impact in the quantity of water and municipalities had a more serious impact on the water quality in the middle course of the Tualatin River.Even with the reduced flow from agricultural irrigation~ the river can maintain relatively good water quality, except when effluents from sewage plants caused highly eutrophic conditions. ACKNOWLEDGMENTS

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Phosphorus in flowing waters

Cited by 87 publications

References 11 publications

Phosphorus Retention in Streams and Wetlands: A Review

Phosphorus Retention in Streams and Wetlands: A Review

The upside-down river: Reservoirs, algal blooms, and tributaries affect temporal and spatial patterns in nitrogen and phosphorus in the Klamath River, USA

The effect of human activity on the middle course of the Tualatin River, Oregon

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