Geochemical cycling of phosphorus in rivers

House, William A.

doi:10.1016/s0883-2927(02)00158-0

Cited by 256 publications

(173 citation statements)

References 44 publications

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“…Although some studies have suggested the importance of Ca-P reactions to regulating nutrient availability (Boyer and Wheeler 1989;Futyma and Miller 2001;Komor 1994) and plant species distributions in fens (Bedford and Godwin 2003), our results are consistent with other studies suggesting alternative mechanisms play a more critical role in regulating P dynamics under conditions of circumneutral pH and low P-availability. Specific processes include plant and microbial uptake, sorption to iron oxides, clays and organic matter, and precipitation with more reactive minerals (House 2003). Plant production of tannic acids and polyphenols also inhibits calcite growth (Hoch et al 2000) while biological production of CO 2 accelerates CaCO 3 dissolution (DePinto et al 1989).…”

Section: Discussionmentioning

confidence: 99%

Groundwater-induced redox-gradients control soil properties and phosphorus availability across four headwater wetlands, New York, USA

Boomer

Bedford

2008

Biogeochemistry

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Hydrochemical patterns across groundwater-fed wetlands, especially carbonate and redox gradients, can influence phosphorus (P) availability by controlling its distribution among different soil pools. We explored these linkages by comparing shallow (5-20 cm) soil properties along groundwater flowpaths in two rich fens, a marl fen, and a poor fen. Organic matter content, bulk density, and total elemental content varied more with depth to underlying drift materials than with water table fluctuation, but also were influenced by groundwater discharge, which stabilized water table elevations and controlled redox conditions. Total sulfur and calcium content increased where pore-water chemistry indicated active iron and sulfate reduction. Calcium mineral dynamics, however, did not appear to influence P availability: first, calcium carbonate (CaCO 3 ) accounted for \2% of the soil composition, except in the marl fen where it accounted for 20-25% of the soil composition. Second, Ca-bound P pools, determined from hydrochloric extraction of wet soil samples, accounted for \25% of the inorganic soil P pool. In contrast, iron-bound P determined from bicarbonate-buffered dithionite solution, accounted for 50-80% of the inorganic soil P, and increased where there was evidence of groundwater mixing, as did P release rates inferred from incubated anion resin bags. The total carbon and phosphorus content of organic-rich soils as well as available and labile P pools were strongly correlated with pore-water iron and alkalinity concentrations. Groundwater discharge and resulting hydrochemical gradients explained significant variation in soil composition and P availability across each site. Results highlight the importance of conducting biogeochemical studies in the context of a site's shallow geologic setting and suggest mechanisms supporting the diverse plant species unique to groundwater wetlands.

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Section: Discussionmentioning

confidence: 99%

Groundwater-induced redox-gradients control soil properties and phosphorus availability across four headwater wetlands, New York, USA

Boomer

Bedford

2008

Biogeochemistry

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“…Samples were analysed within 24 hours, to minimise errors associated with sample instability (House and Warwick, 1998;Jarvie et al, 2002a). SRP is considered equivalent to bioavailable phosphorus (House, 2003). Dissolved reactive silicon concentration was determined by reaction with acid ammonium molybdate, to form yellow molybdosilicic acids.…”

Section: Water Quality Analysismentioning

confidence: 99%

“…To characterise any differences in community composition between treatments, multivariate analyses were performed using CANOCO version 4.5 (Ter Braak, 1988-2003. Exploratory detrended correspondence analyses (DCA) indicated that gradient lengths were short (less than 2) and this, together with an inspection of species responses, suggested that linear methods would be most appropriate (Leps and Smilauer, 2002).…”

Section: Diatom Community Analysismentioning

confidence: 99%

Nutrient and light limitation of periphyton in the River Thames: Implications for catchment management

Bowes

Ings

McCall

et al. 2012

Science of The Total Environment

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This version available http://nora.nerc.ac.uk/16072/ NERC has developed NORA to enable users to access research outputs wholly or partially funded by NERC. Copyright and other rights for material on this site are retained by the rights owners. Users should read the terms and conditions of use of this material at http://nora.nerc.ac.uk/policies.html#access NOTICE: this is the author's version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment [434, 201-212 (2012) . Decreasing ambient SRP concentration from 225 µg l -1 to 173 µg l -1 had no effect on periphyton biomass accrual rate or diatom assemblage. Phosphorus limitation became apparent at 83 µg SRP l -1 , at which point a 25 % reduction in periphyton biomass was observed. Diatom assemblage significantly changed when the SRP concentration was reduced to 30 µg l -1 . Such stringent phosphorus targets are costly and difficult to achieve for the River Thames, due to the high population density and intensive agriculture within the Thames basin. Reducing light levels by shading reduced the periphyton accrual rate by 50 %.Providing shading along the River Thames by planting riparian tree cover could be an effective measure to reduce the risk of excessive algal growth. If the ecology of the Thames is to reach the WFD's "good ecological status", then both SRP concentration reductions (probably to below 100 µg l -1 ) and increased shading will be required.

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“…Recent studies of large-scale reductions in river P concentrations have shown no significant improvement in ecological quality (Jarvie et al, 2002a(Jarvie et al, , 2004. However, more information is required to assess the long-term ecological impacts and lags associated with reducing concentrations in rivers, and the potential importance of within-river processing linked to interactions between river sediments and dissolved P (House, 2003;House and Denison, 2002) and between species and aquatic plants (Jarvie et al, 2002b).…”

Section: Impactmentioning

confidence: 99%

The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach

Haygarth¹,

Condron

Heathwaite

et al. 2005

Science of The Total Environment

253

169

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Geochemical cycling of phosphorus in rivers

Cited by 256 publications

References 44 publications

Groundwater-induced redox-gradients control soil properties and phosphorus availability across four headwater wetlands, New York, USA

Groundwater-induced redox-gradients control soil properties and phosphorus availability across four headwater wetlands, New York, USA

Nutrient and light limitation of periphyton in the River Thames: Implications for catchment management

The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach

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