Phosphorus fractionation in sediments of tropical semiarid reservoirs

Becker, Vanessa; Cavalcante, Herika; Araújo, Fabiana; Noyma, Natalia Pessoa

Phosphorus fractionation in sediments of tropical semiarid reservoirs

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dc.contributor.author	Becker, Vanessa
dc.contributor.author	Cavalcante, Herika
dc.contributor.author	Araújo, Fabiana
dc.contributor.author	Noyma, Natalia Pessoa
dc.date.accessioned	2020-12-07T21:32:17Z
dc.date.available	2020-12-07T21:32:17Z
dc.date.issued	2018-04-01
dc.description.resumo	The reduction of external loads of phosphorus (P) is the main action to control eutrophication in lakes. However, the elimination of these sources is not always sufficient for lakes' recovery, because the P accumulated in the sediment can be released for decades after it has accumulated. Thus, to restore a lake, it is also necessary to reduce its internal P loading. For this, it is essential to know the composition of P in the sediment to evaluate the potential P availability. In this study, the forms of P in the sediment of two reservoirs in a semiarid tropical region were investigated. The forms of P were determined by fractionation, sorting out the forms in loosely sorbed P (P-Water), reductantsoluble P (P-BD), metal oxide-bound P (P-NaOH), P bound to organic matter (P-Humic), calcium-bound P (P-HCl) and residual P (P-residual). The sediment was collected in September 2016 and sliced in situ. The total amount of P forms in the sediment varied from 5 mg kg−1 to 349 mg kg−1 in the Gargalheiras Reservoir and from 12 mg kg−1 to 371 mg kg−1 in the Cruzeta Reservoir. Despite some variation in amounts at different depths, the general range of fractions in Gargalheiras and Cruzeta was: P-BD N P-NaOH N P-HCl N P-water N P-Residual N PHumic. In both reservoirs, the predominant form was BD, followed by NaOH and HCl. The first two forms are available and released easily, making them bioavailable for eutrophication processes and thus phytoplankton growth	pt_BR
dc.identifier.citation	CAVALCANTE, H.; ARAÚJO, F.; NOYMA, N.P.; BECKER, V.. Phosphorus fractionation in sediments of tropical semiarid reservoirs. Science Of The Total Environment, [S.L.], v. 619-620, p. 1022-1029, abr. 2018. Elsevier BV. Disponível em<https://www.sciencedirect.com/science/article/abs/pii/S004896971733262X?via%3Dihub>. Acesso em 20 out 2020.http://dx.doi.org/10.1016/j.scitotenv.2017.11.204	pt_BR
dc.identifier.doi	10.1016/j.scitotenv.2017.11.204
dc.identifier.issn	1879-1026
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30882
dc.language	en	pt_BR
dc.publisher	Elsevier BV	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Bioavailable phosphorus	pt_BR
dc.subject	Tropical reservoirs	pt_BR
dc.subject	Eutrophication	pt_BR
dc.subject	Restoration	pt_BR
dc.title	Phosphorus fractionation in sediments of tropical semiarid reservoirs	pt_BR
dc.type	article	pt_BR