Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles

Rydin, Emil; Malmaeus, Mikael; Karlsson, O. Magnus; Jonsson, Per R.

doi:10.1016/j.ecss.2010.12.020

Cited by 60 publications

(48 citation statements)

References 27 publications

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“…Puttonen et al (2014) estimated the reserve of potentially mobile P in Baltic Sea 30 archipelago and Stockholm inner archipelago surface sediments to 3.5 g m -2 , stored predominantly in redox-sensitive Febound forms on accumulation bottoms. This P reserve is similar to our estimated yearly net P release from deep IA bottoms (up to 3.1 g m -2 yr -1 and a mean of 2.1 g m -2 yr -1 ) and to the P release of 2.7 g m -2 yr -1 estimated by Rydin et al (2011) ) is not sensitive to the defined depth of the deep-water. However, with 15-57 m instead of 20-57 m as deep-water layer the sediment area increases by 40 % and the area-specific mean P release is 1.5 g m -2 yr -1 .…”

Section: Phosphorus Release At Low Oxygen Concentrationssupporting

confidence: 88%

“…Although oxidation of surface sediments can increase short-term P retention due to accumulation of Fe- oxyhydroxides, many studies indicate little effect of this P pool on long-term P retention, which depends on the amount of P permanently buried in the deeper anoxic parts of the sediments (Jensen et al, 1995;Lukkari et al, 2009;Rydin et al, 2011).…”

Section: Long-term Phosphorus Retentionmentioning

confidence: 99%

“…On a longer time-scale the P 15 release from sediments is the imbalance between the P sedimentation and the P binding capacity in the deeper, usually anoxic, sediment (Hupfer and Lewandowski, 2008;Carey and Rydin, 2011;Rydin et al, 2011). Even though Fe(III)-bound P can be abundant in surface sediments in the Baltic Sea, it seems to contribute little to the long-term P retention, since P is permanently buried mainly in organic forms (Jensen et al, 1995;Lukkari et al, 2009;Rydin et al, 2011;Mort et al, 2010) and, under some conditions, as persistent Fe(II)-P minerals (Slomp et al 2013;Reed et al 2016). In marine sediments 20 sulphate reduction promotes the binding of Fe as sulphides, decreasing the Fe available for P-binding, and allowing considerable P release from oxic surface sediments (Caraco et al, 1990;Blomqvist et al, 2004).…”

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confidence: 99%

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A Baltic Sea estuary as phosphorus source and sink

Walve

Sandberg

Larsson

et al. 2017

Preprint

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Abstract. Internal phosphorus (P) loading from sediments, controlled by hypoxia, is often assumed to hamper the recovery of lakes and coastal areas from eutrophic conditions. We use a box-model to calculate seasonal and annual inputs, export, 10 retention and internal cycling of P in the inner archipelago of Stockholm, Sweden (Baltic Sea) in 1968-2015. The area receives freshwater from Lake Mälaren and treated sewage from the greater Stockholm area. The sewage treatment plants (STPs) have improved their nutrient removal in steps, starting with P in 1972 and nitrogen in 1996. In the first 10-20 years after the main P load reduction in 1972-76, the model shows, in comparison to the load, a small negative annual P balance, probably due to release from legacy sediment P stores. The now stabilized, near neutral P balance indicates no continued 15 internal loading from legacy P, but P retention is low, despite improved oxygen conditions. Seasonally, sediments are a P sink in spring and a P source in summer and autumn. Most of the deep-water P release from sediments in summer-autumn appears to be derived from the settled spring bloom and is exported during winter. Oxygen consumption and P release in the deep water are generally tightly coupled, indicating limited control by P binding to iron-oxyhydroxides under oxic conditions. However, in years of deep-water hypoxia enhanced P release suggest contribution from redox-sensitive P stores. 20The oxygen conditions in the area have generally improved, probably due both to lower sedimentation of organic matter from the 1970s and lower STP ammonium loads from the late 1990s. Increased oxygen inputs to the intermediate and deep waters due to weakened stratification and enhanced vertical mixing have probably also contributed, while increased respiration rates due to elevated bottom water temperatures probably explain worsened oxygen conditions during the 1990s.Since the P turnover time is short and legacy P minute, measures to bind P in Stockholm inner archipelago sediments would 25 primarily accumulate P imported from the Baltic Sea and from Lake Mälaren inflow, and management here should focus on reducing external nutrient inputs.

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Section: Phosphorus Release At Low Oxygen Concentrationssupporting

confidence: 88%

Section: Long-term Phosphorus Retentionmentioning

confidence: 99%

mentioning

confidence: 99%

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A Baltic Sea estuary as phosphorus source and sink

Walve

Sandberg

Larsson

et al. 2017

Preprint

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show abstract

“…Although oxidation of surface sediments can increase short-term P retention due to accumulation of Fe oxyhydroxides, many studies indicate little effect of this P pool on long-term P retention, which depends on the amount of P permanently buried in the deeper anoxic parts of the sediments (Jensen et al, 1995;Lukkari et al, 2009;Rydin et al, 2011). Recent results indicate that a persistent Fe(II)-P mineral can form in sediments of the Bothnian Sea (Slomp et al, 2013) and to some extent also in the Baltic Proper .…”

Section: Legacy P Release and Long-term P Retentionmentioning

confidence: 99%

“…On a longer timescale the P release from sediments is due to an imbalance between the P sedimentation and the P binding capacity of the deeper, usually anoxic, sediment (Hupfer and Lewandowski, 2008;Carey and Rydin, 2011;Rydin et al, 2011). Even though Fe(III)-bound P can be abundant in surface sediments in the Baltic Sea, it seems to contribute little to the long-term P retention, since P is permanently buried mainly in organic forms (Jensen et al, 1995;Lukkari et al, 2009;Mort et al, 2010) and, under some conditions, as persistent Fe(II)-P minerals (Slomp et al, 2013;Reed et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A Baltic Sea estuary as a phosphorus source and sink after drastic load reduction: seasonal and long-term mass balances for the Stockholm inner archipelago for 1968–2015

et al. 2018

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Abstract. Internal phosphorus (P) loading from sediments, controlled by hypoxia, is often assumed to hamper the recovery of lakes and coastal areas from eutrophication. In the early 1970s, the external P load to the inner archipelago of Stockholm, Sweden (Baltic Sea), was drastically reduced by improved sewage treatment, but the internal P loading and its controlling factors have been poorly quantified. We use two slightly different four-layer box models to calculate the area's seasonal and annual P balance (input-export) and the internal P exchange with sediments in 1968-2015. For 10-20 years after the main P load reduction, there was a negative P balance, small in comparison to the external load, and probably due to release from legacy sediment P storage. Later, the stabilized, near-neutral P balance indicates no remaining internal loading from legacy P, but P retention is low, despite improved oxygen conditions. Seasonally, sediments are a P sink in spring and a P source in summer and autumn. Most of the deep-water P release from sediments in summer-autumn appears to be derived from the settled spring bloom and is exported to outer areas during winter. Oxygen consumption and P release in the deep water are generally tightly coupled, indicating limited iron control of P release. However, enhanced P release in years of deep-water hypoxia suggests some contribution from redox-sensitive P pools. Increasing deep-water temperatures that stimulate oxygen consumption rates in early summer have counteracted the effect of lowered organic matter sedimentation on oxygen concentrations. Since the P turnover time is short and legacy P small, measures to bind P in Stockholm inner archipelago sediments would primarily accumulate recent P inputs, imported from the Baltic Sea and from Lake Mälaren.

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Phosphorus Bioavailability and Release Potential Risk of the Sediments in the Coastal Wetland: A Case Study of Rongcheng Swan Lake, Shandong, China

Gao

Zhang

Shao

2013

CLEAN Soil Air Water

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Rongcheng Swan Lake, a natural coastal wetland, is connected to Rongcheng Bay of Yellow Sea, China. In this lagoon, water quality has deteriorated gradually in recent 30 years and filamentous Chaetomorpha linum have bloomed during the past five years. In present study, the concentration, fractions, and bioavailability of phosphorus (P) in surface sediments were investigated throughout the lake. In order to evaluate P retention ability of the wetland, six sediment samples from different lake regions were collected to study P adsortion kinetics, adsortion capacity and the relation to sediment properties. In Swan Lake, total P concentrations in sediments varied from 79 to 616 mg/kg, which were significantly higher in northwest region than those in southeast region. Sediment grain size and external inputs were the main factors affecting P distribution. Inorganic P concentration was obviously higher than that of organic P, and Ca-P was the important form in the sediments. Fe/Al-P showed a large spatial variation, with relatively high concentrations occurring at the northeastern corner and the western tip strongly affected by the discharge of wastewater. The adsorption isotherms were well fitted by Linear equation at low P conditions and by Langmuir equation at high initial P concentrations, respectively. The sediments in the northern and central lake had higher P adsorption capacity, while in southern lake the degree of P saturation of the sediments was high. Ammonium oxalate extractable Al, organic matter, and fine particle were important factors influencing P adsorption. In Swan Lake, algae available P (AAP) was the largest form of bioavailable P, followed by Olsen-P; moreover, AAP and Olsen-P showed significant correlations with Fe/Al-P. As a whole, TP concentration in sediments from Swan Lake was low, and the sediments at most regions had buffering ability for P in overlying water; while at the western tip of lake where macroalgal blooms frequently breakout, AAP concentration was relatively high and the sediments had higher potential for releasing P into water column.

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Phosphorus release from coastal Baltic Sea sediments as estimated from sediment profiles

Cited by 60 publications

References 27 publications

A Baltic Sea estuary as phosphorus source and sink

A Baltic Sea estuary as phosphorus source and sink

A Baltic Sea estuary as a phosphorus source and sink after drastic load reduction: seasonal and long-term mass balances for the Stockholm inner archipelago for 1968–2015

Phosphorus Bioavailability and Release Potential Risk of the Sediments in the Coastal Wetland: A Case Study of Rongcheng Swan Lake, Shandong, China

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