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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
IJCMAS is now DOI (CrossRef) registered Research Journal. The DOIs are assigned to all published IJCMAS Articles.
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2019)
[Effective from January 1, 2019]
For more details click here

ICV 2017: 100.00
Index Copernicus ICI Journals Master List 2017 - IJCMAS--ICV 2017: 100.00
For more details click here

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Original Research Articles

PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2017: 100.00
NAAS RATING 2018: 5.38

Int.J.Curr.Microbiol.App.Sci.2017.6(11): 2914-2937
DOI: https://doi.org/10.20546/ijcmas.2017.611.344


Fractionation of Sediment Phosphorus in Lagoon Porto-Novo (Benin Republic) Revisited: Changes in Phosphorus Fractions and Release as Affected by Seasons and Sampling Sites
Henri Kpèdékpo Akogbeto1*, Ahissou Séraphin Zanklan2, Edmond Sossoukpe3 and Emile Didier Fiogbe3
1International Chair in Mathematical Physics and Applications (ICMPA), Faculty of Sciences and Technologies (FAST), University Abomey-Calavi, 072 P.O.Box 50, Cotonou, Benin
2Département de Biologie Végétale, Facultédes Sciences et Techniques (FAST), Universitéd’Abomey-Calavi (UAC), 01 BP 4521, Cotonou (République du Bénin)
3Unité de Recherche sur les Zones Humides, Département de Zoologie, Faculté des Sciences et Techniques, Université d’Abomey-Calavi, 01BP526 Cotonou, Bénin
*Corresponding author
Abstract:

P is a key factor responsible of continental water eutrophication. In lagoon Porto-Novo sediments, it arises from slope basin supplies and biological activity. The present study has the main objective to evaluate phosphorus release rate coming from lagoon sediment, and to analyse the availability of these nutrient fractions. Four sampling point served to take up waters and sediments destined to analyses. The first five centimetres of sediments and waters were used and analyses (sequential extraction method) carried out on fraction 250 µm, lyophilized for phosphorus fractionation. Phosphorus release rate was calculated applying Nürnberg regression equations which have been built from PT concentrations measured in seven Ontario and Connecticut Lake sediments. One-way variance analysis (ANOVA 1) using Dunnett method and Pearson (r) correlation implemented in MINITAB and JMP were applied. Results showed different phosphorus forms inside sediment. These forms were: P-labile, P-Fe, P-Ca, P-Al and P-Org accompanied by P-reside with a rate in mobilizable phosphorus reaching 66.39% PT. P-Org was the most abundant, attaining proportion between 452.6±53.50 µgP/g -2035.4±311.2 µgP/g of dry sediment, consequence of organic matter accumulation from slope basin due to diverse human activities, and animal and plant organic matters present on the watershed. P-Ca is relatively more found in station S1 and S4 in contrast to S2 and S3. Release rate (TL) registered (11,05 mg*m-2*j-1) indicates then that lagoon Porto-Novo is in a more or less advanced degradation state with an internal load estimated by156,03 mg*m-2*saison-1. These results should be helpful for local and national authorities and stakeholders in setting environmental policies regarding phosphorus reduction, particularly that flowing from slope basin.


Keywords: Sequential extraction, Phosphorus, Release, Fractionation, Release rate.
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How to cite this article:

Henri Kpèdékpo Akogbeto, Ahissou Séraphin Zanklan, Edmond Sossoukpe and Emile Didier Fiogbe. 2017. Fractionation of Sediment Phosphorus in Lagoon Porto-Novo (Benin Republic) Revisited: Changes in Phosphorus Fractions and Release as Affected by Seasons and Sampling Sites.Int.J.Curr.Microbiol.App.Sci. 6(11): 2914-2937. doi: https://doi.org/10.20546/ijcmas.2017.611.344