Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

Renjith, K. R.; Chandramohanakumar, N.; Joseph, Manju Mary

doi:10.1007/s10661-010-1458-8

Cited by 42 publications

(11 citation statements)

References 45 publications

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“…Although P-Ca was more stable than P-Fe, this fraction was significantly regulated by pH and the carbonate content (Ren et al 2012; Wang 2012; Gireeshkumar et al 2013; Zhang et al 2015). A study on the fractionation and bioavailability of phosphorus in a tropical estuary in southwestern India indicated that high concentrations of P-Ca might be interpreted as the result of the accumulation of calcium in estuarine environments under favorable higher salinity and pH conditions (Renjith et al 2011). The same study indicated that salinity controls the flocculation and sedimentation mechanisms in estuarine environments.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

et al. 2016

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The Guapimirim estuary is the main tributary of Guanabara bay and is located in the northeast portion. Although it is protected, this estuary has been experiencing strong anthropogenic pressure, which has led to changes in the natural characteristics. Large amounts of sewage are dumped into the bay through tributaries, thereby changing the water and bottom sediment quality. One of the main elements of sewage is phosphorus. Despite its importance to life, a high concentration of this nutrient in the environment can result in eutrophication. This work describes the phosphorus distribution in its different fractions in the bottom sediment at 16 stations located in the main channel of the Guapimirim estuary. These results are correlated with data on grain size, organic matter and calcium carbonate content in the bottom sediment and with physicochemical parameters of the bottom water. The grain size decreases toward the mouth of the estuary, whereas the organic matter and carbonate content increase. The salinity increases significantly at 3.5 km upstream from the mouth, where there is also a notable increase in fine sediments; the same site is the mean position of the salinity front. The temperature and pH increase in the same direction. The Pinorg-total ranges between 3.18 and 7.13 µmol g−1, increasing toward the mouth. The same trend is observed for the other phosphorus fractions P-Ca, P-Fe and P-f.a., which range from 0.68 to 1.91, 0.79 to 1.71 and 0.03 to 0.93 µmol g−1, respectively. The P-Ca and P-Fe fractions are the most representative in the Pinorg-total, occurring at 26.3 and 26.0 %, respectively.

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Section: Resultsmentioning

confidence: 99%

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

et al. 2016

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“…In Akaipur, they were as high as 9490 mg kg ¡1 and up to 11,700 mg kg ¡1 in the rainy season (selected from the full data set preaveraging). These were much higher than those reported by others (Banerjea and Ghosh, 1970;Rzepecki, 2010;Renjith et al, 2011). The average sediment C:P ratios were also low (C:P D 5.39, 6.79 by mass for Akaipur and Bhomra, respectively) indicating P enrichment.…”

Section: Discussionmentioning

confidence: 51%

“…Aluminum bound P is stable and less mobile than iron bound P (Ann et al, 2000). Phosphorus fractionation gives valuable information about potential internal loading or fixation of P in sediment and is a useful tool in long-term trophic state management of lakes and rivers (Psenner et al, 1984;Renjith et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Sediment phosphorus forms and levels in two tropical floodplain wetlands

Samanta

Debnath

Maitra

et al. 2015

Aquatic Ecosystem Health &Amp; Management

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Inorganic phosphorus is one of the critical nutrients determining trophic state and freshwater productivity. Sediment may act as a sink or source of phosphorus to the overlying water depending on its pH, redox state, various forms of phosphorus present, etc. To examine potential sorption or mobilization of sediment phosphorus in floodplain wetlands, the amount and distribution of phosphorus fractions were evaluated using a sequential chemical extraction procedure. Exceedingly high levels of total phosphorus (mean: 6040 § 344, 5470 § 363 mg kg ¡1 ), consisting largely of organic and refractory fraction (70 -98%), followed by calcium-phosphorus (mean: 584 § 31.3, 143 § 8.42 mg kg ¡1 ) and iron-phosphorus (mean: 108 § 10.1, 91.0 § 7.68 mg kg ¡1 ) were recorded respectively in Bhomra and Akaipur wetlands of West Bengal, India. The inorganic phosphorus, comprising the loosely sorbed phosphorus and all the mineral bound forms contributed only about 6-14% to the total phosphorus indicating their less significance in phosphorus sorption or desorption in these tropical wetlands. Although the loosely sorbed phosphorus was in moderate level (2.69 § 0.69, 1.54 § 0.53 mg kg ¡1 ), water dissolved phosphorus was recorded at higher concentrations (mean: 0.16 § 0.02 mg l ¡1 in Akaipur and 1.08 § 0.12 mg l ¡1 in Bhomra). However, the higher level of water available phosphorus was not reflected in plankton production since the dominance of weeds suppresses their growth. This study recorded large accumulation of organic matter and nutrients in the form of detritus in these wetlands which may be channelized for fish production through stocking of suitable detritivorous fishes and/or reducing macrophyte coverage that would give space and nutrients for phytoplankton growth.

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“…In addition, large amounts of shellfish live in southern lake, where apatite can be formed at the surface of shell fragments (Tab. ) . Fe/Al–P had a large spatial variation, with higher concentrations at NW corner and the western tip where external pollution from the discharge of wastewater is serious.…”

Section: Discussionmentioning

confidence: 99%

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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Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

Cited by 42 publications

References 45 publications

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

Sediment phosphorus forms and levels in two tropical floodplain wetlands

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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