The Chemical Nature of Phosphorus in Subtropical Lake Sediments

Torres, Isabela Claret; Turner, Benjamín L.; Reddy, K. R.

doi:10.1007/s10498-014-9228-9

Cited by 29 publications

(10 citation statements)

References 69 publications

(88 reference statements)

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“…Because of concerns over post-depositional P mobility, some investigators have questioned the utility of sediment P fractions as proxies for eutrophication [ 37 ], [ 38 ]. We argue, however, that the complex and very different stratigraphies of H 2 O-P, HE-P and TP, as well as discrete peaks in concentration of these variables in LH-6-13 demonstrate a lack of post-depositional mobility for these P forms in the Lake Harris core.…”

Section: Discussionmentioning

confidence: 99%

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A Holocene Sediment Record of Phosphorus Accumulation in Shallow Lake Harris, Florida (USA) Offers New Perspectives on Recent Cultural Eutrophication

et al. 2016

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We studied a complete Holocene sediment record from shallow (zmax = 9.7 m) Lake Harris, Florida (USA) to infer the historical development of the lake and its current eutrophic status. We used 210Pb and 14C to date the 5.9-m sediment sequence (core LH-6-13) and determined accumulation rates for bulk sediment, organic matter, calcium carbonate, phosphorus fractions and biogenic silica fractions. The chronology of changes in sediment characteristics for LH-6-13 is consistent with the general paleoenvironmental framework established by core studies from other Florida lakes. Lake Harris began to fill with water in the early Holocene, ca. 10,680 cal a BP. A shift from carbonate-dominated to organic-rich sediments ca. 5,540 cal a BP corresponds to a transition to wetter climate in the middle Holocene. A rapid increase in diatom biogenic silica concentrations and accumulation rates ca. 2,600 cal a BP signals that the lake had deepened to its modern limnetic state. In LH-6-13, an up-core decrease in rates of accumulation for several sediment variables indicates time-course oligotrophication of the lake through the Holocene. In near-surface sediments, abrupt increases in the accumulation rates of these same variables indicate progressive cultural eutrophication after ca. AD 1900. Comparison of the modern state of Lake Harris to its condition 50–100 years ago provides a measure of the impact of recent cultural eutrophication. Because the pre-disturbance trajectory of this lake was one of oligotrophication, the true impact of cultural eutrophication is even greater than what is inferred from the changes over the past century.

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Section: Discussionmentioning

confidence: 99%

“…2,500 cal a BP. Kenney et al [ 28 ] referred to the HE-P fraction as equivalent to polyphosphate (Poly-P), but HE-P may also include other organic components of sediment P [ 38 ], [ 39 ]. To avoid confusion, we use the operationally defined term HE-P here.…”

Section: Discussionmentioning

confidence: 99%

A Holocene Sediment Record of Phosphorus Accumulation in Shallow Lake Harris, Florida (USA) Offers New Perspectives on Recent Cultural Eutrophication

et al. 2016

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“…Significant P loading from sediments has been observed in environments as diverse as estuarine (Roy et al, 2012), boreal (Tammeorg et al, 2015), and subtropical (Xie et al, 2003;Grunwald et al, 2006;Torres et al, 2014), and in bodies of water as large as the North American Great Lakes (Kane et al, 2014) and Lake Taihu in China (You et al, 2007). Excess P inputs are often stored in lentic systems as "legacy" P (Sharpley et al, 2013), which is P that has been accumulating in sediments over time and may take tens to thousands of years to flux out of the system (Kleinman et al, 2011a).…”

Section: Introductionmentioning

confidence: 99%

Characterizing nutrient distributions and fluxes in a eutrophic reservoir, Midwestern United States

Pearce

Chambers

Hasenmueller

2017

Science of The Total Environment

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Harmful algal blooms are increasingly common in aquatic ecosystems and have been linked to runoff from agricultural land. This study investigated the internal nutrient (i.e., phosphorus (P) and nitrogen (N)) dynamics of a eutrophic reservoir in the Midwestern United States to constrain the potential for sedimentary nutrients to stimulate harmful algal blooms. The spatial distribution of nutrients in the water column (soluble reactive P (SRP), nitrate/nitrite-N (NO-N), and ammonium-N (NH-N)) and sediments (total P, total carbon (C), total N, and organic matter (OM)) were quantified and mapped. Water column nutrients varied spatially and temporally, with generally higher concentrations near the dam wall during normal lake levels. The upper portion of the lake, near the inlet, was sampled during a flood event and had overall higher nutrient concentrations and lower chlorophyll levels compared to normal lake level samples. Mean sedimentary total P (936mg/kg) was ~30% higher in the reservoir than the surrounding upland soils, with the highest concentrations near the dam wall (1661mg/kg) and a significant positive correlation found between sedimentary total P, total C, and OM. Additionally, 15 intact sediment cores were manipulated ex situ to examine mechanisms of nutrient flux across the sediment-water interface (SWI) that may trigger algal blooms. Core treatment conditions included advection (i.e., simulating potential nutrient fluxes during wind events through sediment resuspension) and diffusion. Core experiments indicated both advective and diffusive conditions at the SWI may trigger the flux of nutrients important for algal growth from lake sediments, with diffusion contributing both N and P to the water column, while intense advection increased water column N, but decreased P. Release of P to the water column may be more diffusion-driven than advection-driven, whereas N release to the water column appears to be both diffusion- and advection-driven.

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“…It was demonstrated that sediment acted as a sink or a source of P to the overlying water in Poyang Lake. The P concentration gradient between sediment and overlying water, porosity, particle size, as well as some other factors were considered to have influenced the DRP fluxes (Torres et al 2014). Since this model did not consider the influence of bio-perturbation, the horizontal migration of phosphorous in the water body, and the wave disturbance of sediments, the results of Fick's Law were, in general, slightly lower than the real diffusion flux.…”

Section: ¡1mentioning

confidence: 99%

The diffusion fluxes and sediment activity of phosphorus in the sediment–water interface of Poyang Lake

Yang

Liang

et al. 2016

Journal of Freshwater Ecology

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The dissolved reactive phosphorous (DRP) in pore water releases into the water body through the sedimentÀwater interface. The DRP concentrations in the water and sediment of Poyang Lake were determined by highresolution pore diffusion balance (HR-Peeper) and Zr-oxide diffusive gradients in thin films (Zr-oxide DGT) techniques. The range of the DRP concentrations in the pore water samples of different sampling sites was 30À360 ng/cm . The results showed that the P diffusion flux was higher in the middle of the Poyang Lake than both upstream and downstream of the lake.

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The Chemical Nature of Phosphorus in Subtropical Lake Sediments

Cited by 29 publications

References 69 publications

A Holocene Sediment Record of Phosphorus Accumulation in Shallow Lake Harris, Florida (USA) Offers New Perspectives on Recent Cultural Eutrophication

A Holocene Sediment Record of Phosphorus Accumulation in Shallow Lake Harris, Florida (USA) Offers New Perspectives on Recent Cultural Eutrophication

Characterizing nutrient distributions and fluxes in a eutrophic reservoir, Midwestern United States

The diffusion fluxes and sediment activity of phosphorus in the sediment–water interface of Poyang Lake

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