Does vivianite control phosphate solubility in anoxic meadow soils?

Walpersdorf, Eva; Koch, Christian; Heiberg, Lisa; O’Connell, David; Kjærgaard, Charlotte; Hansen, Hans Christian Bruun

doi:10.1016/j.geoderma.2012.10.003

Cited by 56 publications

(33 citation statements)

References 55 publications

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“…P cycling can also be modulated by secondary redox-dependent geochemical reactions ( Fig. 1) that may result in ferrous or ferric authigenic P mineral precipitation, such as vivianite or strengite/ tinticite phases (Lijklema 1980, Hyacinthe and Van Cappellen 2004, Walpersdorf et al 2013, Rothe et al 2014. As the production of phosphate is tied to organic matter remineralization, organic matter input to sediments is critical in shaping P release.…”

Section: Geochemistrymentioning

confidence: 99%

Tube‐dwelling invertebrates: tiny ecosystem engineers have large effects in lake ecosystems

Hölker

Vanni

Kuiper

et al. 2015

Ecological Monographs

136

118

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Abstract. There is ample evidence that tube-dwelling invertebrates such as chironomids significantly alter multiple important ecosystem functions, particularly in shallow lakes. Chironomids pump large water volumes, and associated suspended and dissolved substances, through the sediment and thereby compete with pelagic filter feeders for particulate organic matter. This can exert a high grazing pressure on phytoplankton, microorganisms, and perhaps small zooplankton and thus strengthen benthic-pelagic coupling. Furthermore, intermittent pumping by tube-dwelling invertebrates oxygenates sediments and creates a dynamic, three-dimensional mosaic of redox conditions. This shapes microbial community composition and spatial distribution, and alters microbe-mediated biogeochemical functions, which often depend on redox potential. As a result, extended hotspots of element cycling occur at the oxic-anoxic interfaces, controlling the fate of organic matter and nutrients as well as fluxes of nutrients between sediments and water. Surprisingly, the mechanisms and magnitude of interactions mediated by these organisms are still poorly understood. To provide a synthesis of the importance of tube-dwelling invertebrates, we review existing research and integrate previously disregarded functional traits into an ecosystem model. Based on existing research and our models, we conclude that tube-dwelling invertebrates play a central role in controlling water column nutrient pools, and hence water quality and trophic state. Furthermore, these tiny ecosystem engineers can influence the thresholds that determine shifts between alternate clear and turbid states of shallow lakes. The large effects stand in contrast to the conventional limnological paradigm emphasizing predominantly pelagic food webs. Given the vast number of shallow lakes worldwide, benthic invertebrates are likely to be relevant drivers of biogeochemical processes at regional and global scales, thereby mediating feedback mechanisms linked to climate change.

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Section: Geochemistrymentioning

confidence: 99%

Tube‐dwelling invertebrates: tiny ecosystem engineers have large effects in lake ecosystems

Hölker

Vanni

Kuiper

et al. 2015

Ecological Monographs

136

118

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“…Under anoxic conditions, reductive dissolution of iron(III)-oxides results in the concurrent release of P i and Fe 2+ which may initiate precipitation of iron(II) phosphate phases, such as vivianite (Scalenghe et al 2002;House, 2003;Walpersdorf et al 2013). Iron(II) can also be released by reductive dissolution of other phases such as iron(III)-smectite leading to the formation of siderite, illite and again vivianite (Dong et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Assuming a pH of 7, Fe 2+ concentrations in the range of 50 to 2000 μ M and absence of strong metal complexing ligands, this implies that the total P i concentration in the solution in equilibrium with vivianite is between 0.05 and 2.5 μ M. In addition, it has been shown that if Fe 2+ concentrations are kept low due to equilibrium with siderite, then P i in equilibrium with vivianite will be higher (Walpersdorf et al, 2013). Thus, under certain conditions vivianite may serve to control P i concentrations below threshold concentrations (~1 μ M) for eutrophication even for phosphate rich sediments.…”

Section: Introductionmentioning

confidence: 99%

Vivianite formation and its role in phosphorus retention in Lake Ørn, Denmark

et al. 2015

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“…By flux calculations Emerson and Widmer (1978) demonstrated that mineral formation is surface-rather than diffusion-controlled, and hence there is no equilibrium control by vivianite with respect to pore water SRP and Fe 2+ concentrations (Postma, 1981). Recently, Walpersdorf et al (2013) confirmed that vivianite does not control phosphate solubility in an anoxic meadow soil.…”

Section: Introductionmentioning

confidence: 99%

Evidence for vivianite formation and its contribution to long-term phosphorus retention in a recent lake sediment: a novel analytical approach

et al. 2014

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Abstract. Vivianite, Fe 3 (PO 4 ) 2 · 8H 2 O, is a ferrous iron phosphate mineral which forms in waterlogged soils and sediments. The phosphorus (P) bound in its crystal lattice is considered to be immobilised because vivianite is stable under anoxic, reducing, sedimentary conditions. Thus, vivianite formation can make a major contribution to P retention during early diagenesis. Much remains unknown about vivianite in sediments, because technical challenges have rendered direct identification and quantification difficult. To identify vivianite and assess its significance for P burial during early diagenesis we studied the consequences of a 1992/1993 in-lake application of FeCl 3 and Fe(OH) 3 aimed at restoring Lake Groß-Glienicke (Berlin, Germany). In a novel approach, we firstly applied a heavy-liquid separation to the iron-rich surface sediments which allowed direct identification of vivianite by X-ray diffraction in the high-density (ρ > 2.3 g cm −3 ) sediment fraction. Secondly, we assessed the contribution of vivianite to P retention, combining results from chemical digestion with magnetic susceptibility data derived from magnetic hysteresis measurements. Scanning electron microscopy revealed that the dark blue spherical vivianite nodules were 40-180 µm in diameter, and formed of platy-and needle-shaped crystal aggregates. Although equilibrium calculations indicated supersaturation of vivianite throughout the upper 30 cm of the sediment, the vivianite deposits were homogeneously distributed within, and restricted to, the upper 23 cm only. Thus, supersaturated pore water alone cannot serve as a reliable predictor for the in situ formation of vivianite. In Lake Groß-Glienicke, vivianite formation continues to be triggered by the artificial iron amendment more than 20 yr ago, significantly contributing to P retention in surface sediments.

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Does vivianite control phosphate solubility in anoxic meadow soils?

Cited by 56 publications

References 55 publications

Tube‐dwelling invertebrates: tiny ecosystem engineers have large effects in lake ecosystems

Tube‐dwelling invertebrates: tiny ecosystem engineers have large effects in lake ecosystems

Vivianite formation and its role in phosphorus retention in Lake Ørn, Denmark

Evidence for vivianite formation and its contribution to long-term phosphorus retention in a recent lake sediment: a novel analytical approach

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