Phosphorus Release and Equilibrium Dynamics of Canal Sediments within the Everglades Agricultural Area, Florida

Das, Jaya; Daroub, Samira H.; Bhadha, Jehangir H.; Lang, Tim; Josan, Manohardeep S.

doi:10.1007/s11270-012-1152-2

Cited by 18 publications

(24 citation statements)

References 37 publications

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“…Our results support the hypothesis of Millero et al (2001a) (Osborne et al, 2014;Wang et al, 2011). The P retention capacity of the sediments in both freshwater marshes and bays protect the overlying water column from rapid P release (Wang and Li, 2010), although where P-loading is intense, such as the Everglades Agricultural Area even freshwater can induce significant desorption from the sediment (Das et al, 2012). The results of this study suggest that carbonate sediment in water with high HCO 3 concentration would have severely limited ability to remove excess SRP from the water and would readily desorb P from sediments.…”

Section: Discussionsupporting

confidence: 90%

Control of phosphorus concentration through adsorption and desorption in shallow groundwater of subtropical carbonate estuary

Flower

Rains

Lewis

et al. 2016

Estuarine, Coastal and Shelf Science

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The balance of fresh and marine water sources in coastal mixing zones can affect phosphorus (P) availability, one of the important drivers of primary productivity. This study focuses on an abiotic portion of the P cycle in the mangrove ecotone of Taylor Slough, coastal Everglades, Florida. We investigated the P sorption properties of sediment with three distinct water sources in this region: 1) fresh groundwater from the inland Everglades, 2) bicarbonate enriched groundwater from the mangrove ecotone, and 3) surface saltwater from Florida Bay. Ecotone groundwater caused soluble reactive P (SRP) to exhibit markedly low sorption efficiency (K d =0.2 L g-1) compared to fresh groundwater and Florida Bay water (11.3 L g-1 and 3.4 L g-1 , respectively). The low SRP buffering capacity of the sediment in ecotone groundwater would maintain higher ambient water SRP concentration in ecotone groundwater than in the other two waters, and would trigger desorption if the sediment changed from one of them to ecotone groundwater. The relative sorption efficiency is consistent with the measured zero equilibrium SRP concentration being highest in ecotone groundwater (0.094 ± 0.003 M) and lower in fresh groundwater and Florida Bay surface water (0.075 ± 0.005 M and 0.058 ± 0.004 M respectively). The temporal variability of SRP concentration in groundwater at the ecotone field station is greater than the range of zero equilibrium SRP concentration for all three waters, so very low SRP concentration in the ambient water would induce desorption from the sediment. Soluble reactive P would be expected to begin desorbing from the sediments at a higher ambient SRP concentration in ecotone groundwater than the other two water types. Our results suggest that ecotone groundwater would release more SRP from mangrove sediments compared to the upstream and downstream waters, due to both its lower P sorption efficiency and its higher zero equilibrium SRP concentration.

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Section: Discussionsupporting

confidence: 90%

Control of phosphorus concentration through adsorption and desorption in shallow groundwater of subtropical carbonate estuary

Flower

Rains

Lewis

et al. 2016

Estuarine, Coastal and Shelf Science

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“…Mineral saturation indices, based on PHREEQC modeling, are presented in figure 7. Prior to injection, L22A water was undersaturated (i.e., negative) with respect to most Fe, Al, and Ca PO 4 mineral phases; preinjection waters were supersaturated (i.e., positive) with respect to hydroxyapatite.The shift in saturation index following SRP injection, to include supersaturation with respect to octacalcium and tricalcium PO 4 , was similar to that found by others (House and Denison 2000;Das et al 2012). Under laboratory conditions, some researchers have suggested that Ca PO 4 precursors crystallize prior to hydroxyapatite formation (Feenstra and de Bruyn 1979), while others have found rapid formation (~85 minutes) of hydroxyapatite (Wang et al 2009).…”

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confidence: 84%

Assessment of phosphorus retention in irrigation laterals

Ippolito¹,

Nelson²

2013

Journal of Soil and Water Conservation

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Irrigation laterals transport irrigation return flow, including water, sediment, and dissolved nutrients, such as phosphorus (P), back to surface water bodies. Phosphorus transformations during transport can affect both P bioavailability and the best management practices selected to minimize P inputs to waters of the United States. The objective of this study was to determine P retention in three irrigation laterals. Soluble reactive P (SRP) concentrations in lateral waters were increased from 0.08 to 0.25 mg L -1 (0.08 to 0.25 ppm) by constantly injecting a phosphate (PO 4 ) solution for 2.5 hours. Bromide (Br) was used as a conservative tracer to determine dilution effects. Water was sampled at 10-minute intervals, beginning 30 minutes prior to injection and 120 minutes following injection, at one upstream location and various downstream locations to approximately 1,550 m (~1 mi) from injection sites. When at steady state, SRP concentrations only decreased by 5% over the lengths studied, equating to P uptake lengths of over 18 km (11.2 mi), which was one to two orders of magnitude greater than natural streams; the linear SRP uptake rate was 0.011 mg L -1 km -1 (0.018 ppm mi -1). Longer P uptake lengths and lower uptake rates in irrigation laterals, as compared to natural streams, may be due to the elevated sediment equilibrium P concentration, greater water velocities, and removal of vegetation causing a reduction in frictional resistance. Reducing water velocities should optimize irrigation lateral conditions to reduce uptake length and maximize P uptake. Key words: coulee-irrigation lateral-retention-soluble reactive phosphorus-transportAquatic resources in the United States are among its most valuable assets, yet approximately 40% of assessed stream miles, 45% of assessed lake acres, and 50% of assessed estuary acres are impaired (USEPA 2003). The transport of excess nutrients is one of the leading causes of waterway impairment (USEPA 2003). In particular, soluble reactive phosphorus (SRP) transport in aquatic systems is of interest because phosphorus (P) is commonly regarded as the limiting nutrient governing primary production in fresh water systems (Foy 2005). Specifically, P transport in return-flow irrigation laterals may be a significant P source to river systems such as the Snake River in Idaho. Thus, determining and understanding the uptake distance SRP travels prior to being removed from solution during source-tosink water movement could help identify whether current regional soil and water management strategies are having as significant of an impact on water quality improvement as intended.Soluble reactive P travel distance during water transport can be quantified in terms of P spiraling length, or the distance SRP travels as it cycles through dissolved to particulate (organic or inorganic forms) and back to the dissolved state (Davis and Minshall 1999). Total spiraling length is the sum of uptake length (distance traveled in the dissolved form) and turnover length (distance traveled in...

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“…Although redox‐sensitive P remains relatively stable under constant oxic conditions, it can be released from these sediments at the onset of anoxia (Søndergaard et al, 2003). The accumulation of Fe in organic soils and sediments is often attributed to the formation of OM‐Fe or OM‐ferrihydrite complexes, which are also capable of adsorbing P (Larsen et al, 1959; Gerke and Hermann, 1992; Kang et al, 2009; Gerke, 2010; Das et al, 2012). We postulate that these complexes have contributed to the redox‐sensitive P in the sediments of the West Holland River.…”

Section: Resultsmentioning

confidence: 99%

Speciation of Phosphorus from Agricultural Muck Soils to Stream and Lake Sediments

et al. 2018

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The nature and management of agricultural soils can influence the forms of legacy P present in affected sediments; however, few studies have specifically characterized P in sediments affected by polder agriculture. In this study, the speciation of P as it flows from the muck soils of the Holland Marsh to the sediments of the West Holland River and Lake Simcoe, Ontario, Canada, was investigated. The distribution of P fractions and the characterization of organic P were analyzed by the sequential fractionation method and solution P nuclear magnetic resonance spectroscopy, respectively. Organic P was the predominant P form (∼58% of total P) in muck soils, whereas the redox-sensitive P fraction was predominant in surface stream sediments rich in organic matter (∼41-48% of total P), despite these sediments exhibiting near-neutral pH and high concentrations of both Ca and P. The proportion of relatively recalcitrant organic P forms was much greater in the muck soils than that exhibited by both stream and lake sediments. The decreasing proportion of recalcitrant organic P forms in sediments downstream from the Holland Marsh indicated the potential for faster organic P cycling. Our findings support the notion that diesters and pyrophosphate should be monitored, in addition to loosely bound inorganic P, due to their potential impact on water quality. The unique environment of the streams and lake area is considered to be particularly vulnerable to excessive fertilizer P use in adjacent croplands.

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Phosphorus Release and Equilibrium Dynamics of Canal Sediments within the Everglades Agricultural Area, Florida

Cited by 18 publications

References 37 publications

Control of phosphorus concentration through adsorption and desorption in shallow groundwater of subtropical carbonate estuary

Control of phosphorus concentration through adsorption and desorption in shallow groundwater of subtropical carbonate estuary

Assessment of phosphorus retention in irrigation laterals

Speciation of Phosphorus from Agricultural Muck Soils to Stream and Lake Sediments

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