Phosphorus Fractions and Fluxes in the Water Column and Sediments of a Tropical Reservoir (Lobo-Broa - SP)

Chalar, Guillermo; Tundisi, José Galízia

doi:10.1002/1522-2632(200104)86:2<183::aid-iroh183>3.0.co;2-y

Cited by 15 publications

(4 citation statements)

References 37 publications

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“…The lake‐sediment phosphorus fractions exhibited no clear seasonal or vertical patterns in this study. The majority of the TP in the sediments of Lake Mogan was composed of inorg‐P fractions, consistent with the results of Chalar and Tundisi (2001) and Sondergaard et al . (1996).…”

Section: Discussionsupporting

confidence: 91%

Sediment phosphorus characteristics in the clearwater state of Lake Mogan, Turkey

Pulatsü¹,

Kırkaǧaç

Köksal

2008

Lakes & Reservoirs

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This study examined the vertical distributions of total phosphorus (TP) and phosphorus fractions, and the iron and organic matter, in the littoral sediment in a macrophyte-dominated, clearwater state in Lake Mogan between September 2005 and August 2006. Benthic macroinvertebrates and total bacteria in the sediment also were determined. No clear seasonal or depth-related (0-20 cm) patterns were found in sediment concentrations for the measured parameters. The phosphorus release was quantitatively very low, and a negative phosphorus release (-0.132 μg m -2 day -1 ) was measured during the summer months. The TP concentrations of the sediment samples ranged between 675.00 and 1463.80 μg g -1 dry weight (DW), and the trophic level of the lake was eutrophic. On average, inorganic phosphorus fractions comprised the largest fraction (63%), while organic-bound phosphorus (Org ≈ P) constituted 37% of the TP in Lake Mogan. The most important phosphorus-immobilizing factors are high iron content (14 200-47 750 μg g -1 DW), the sediment's clay content (47.80-51.80%), and an abundance of macrophytes at the sampling station. The low abundance of benthic macroinvertebrates (510-850 individuals m -2 ), which depend on sediments with high iron and low organic matter (5.42-13.30%), played a role in the sediment phosphorus retention. Although bacterial abundance in the surficial sediment appeared to be positively correlated to temperature, the overlying water did not experience anoxic conditions, supporting a state in which bacteria were able to retain phosphorus in their cell structures. Long-term changes in the sediments of Lake Mogan must be monitored lake. In order to optimize the management of the lake, and to determine the longevity of a clearwater state following management measures and continued external phosphorus loading, long-term changes in the sediments of Lake Morgan must be monitored.

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Section: Discussionsupporting

confidence: 91%

Sediment phosphorus characteristics in the clearwater state of Lake Mogan, Turkey

Pulatsü¹,

Kırkaǧaç

Köksal

2008

Lakes & Reservoirs

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“…Phosphorus (P) fractionation in sediments from aquatic and wetland ecosystems plays a critical role in determining P mobility and exchanges with the overlying water [ Chalar and Tundisi , 2001; Shilla et al , 2009]. It provides information on P reactivity, bioavailability, and potential contamination of water bodies [ Richardson , 1985; Reddy et al , 1995].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus fractionation and distribution in sediments from wetlands and canals of a water conservation area in the Florida Everglades

Wang

Ouyang

2011

Water Resources Research

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[1] Phosphorus (P) fractionation and distribution in sediments are of great concern in the Florida Everglades ecosystem because potential eutrophication of surface waters usually results from P external loading and stability. Intact core sediment samples were collected to a depth of 35 cm from wetlands and canals across Water Conservation Area 3 (WCA-3) of the Florida Everglades. These sediment cores were sliced into 5 cm increments and analyzed for P contents in different fractions by sequential extraction. These fractions mainly included total P (TP), readily available P (Pi-KCl), Fe/Al-bound P (Pi-NaOH), Ca/Mg-bound P (Pi-HCl), organic P (Po-NaOH), and residual P (Po Residue ). Results showed that the canal sediments had the highest concentrations of TP, with about 87% in the form of Ca/Mg-bound fraction, and the concentrations of TP in these sediments increased with depth. In contrast, the wetland sediments contained the lowest concentrations of TP (predominantly in the organic fraction), with 43% residual P and 27% Po-NaOH, and the concentrations of TP in these sediments decreased with depth. In addition, a large amount of the readily available P (up to 1500 mg kg −1 ) in the canal sediments was accumulated at the top layer of 0-5 cm. This study suggests that any disturbance and/or environmental alterations, such as high canal flow and dredging in canal sediments, could pose a potential risk of a P increase in the water column and, consequently, in the wetlands because of the release of readily available P despite the relatively stable nature of such P fractions in these sediments.

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“…In freshwater ecosystems, the internal release of N and P from sediments is determined primarily by their forms and contents in sediments [31][32][33]. Exchangeable P (NH 4 Cl-P), redox-sensitive Fe-bound P (BD-P), and Fe/Al-oxide-bound P (NaOH-P) are considered mobile forms of P in sediments [32].…”

Section: Introductionmentioning

confidence: 99%

“…Exchangeable P (NH 4 Cl-P), redox-sensitive Fe-bound P (BD-P), and Fe/Al-oxide-bound P (NaOH-P) are considered mobile forms of P in sediments [32]. They can be mobilized and released from sediments into the overlying water during changes in biogeochemical conditions in sediments [31,34]. N, which is present in sediments mainly in organic forms, can be a source of ammonium N (NH 4 -N) during degradation of organic matter and be released into the overlying water [35], sometimes even exceeding the external input of N [36].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China

Cheng

Bao

Yang

et al. 2022

Water

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Growing evidence has demonstrated the influence of internal nitrogen (N) and phosphorus (P) on harmful algae blooms in eutrophic freshwater ecosystems. However, the main controlling factors for internal N and P release risks, and whether these factors vary as environmental conditions change, remains poorly understood. We evaluated potential release risks of N and P from sediments in two freshwater reservoirs in Beihai City, southern China, by evaluating apparent nutrient fluxes during simulated static incubation experiments at two temperatures (15 °C and 25 °C). Sediments were analyzed to determine their basic properties as well as N and P fractions. Results showed that the main controlling factors of the apparent fluxes in dissolved total P, soluble reactive P, total N, and ammonium were related to sediment adsorption properties, redox properties, and microbial-mediated properties (e.g., water-extractable P, total inorganic N, redox-sensitive P, total organic carbon, organic P). The primary controlling factors for apparent N and P fluxes were dependent on the form of N and P and changed with temperature. The results suggest that care should be taken when simply using total N and P contents in sediments to evaluate their internal nutrient release risks.

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Phosphorus Fractions and Fluxes in the Water Column and Sediments of a Tropical Reservoir (Lobo-Broa - SP)

Cited by 15 publications

References 37 publications

Sediment phosphorus characteristics in the clearwater state of Lake Mogan, Turkey

Sediment phosphorus characteristics in the clearwater state of Lake Mogan, Turkey

Phosphorus fractionation and distribution in sediments from wetlands and canals of a water conservation area in the Florida Everglades

Evaluation of the Potential Release Risk of Internal N and P from Sediments—A Preliminary Study in Two Freshwater Reservoirs in South China

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