Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X10220
Acta Limnologica Brasiliensia
Original Article

Internal phoshorus loading potential of a semiarid reservoir: an experimental study

Potencial de fertilização interna de fósforo de um reservatório semiárido: um estudo experimental

Hérika Cavalcante; Fabiana Araújo; Vanessa Becker; José Etham de Lucena Barbosa

http://dx.doi.org/10.1590/S2179-975X10220 Acta Limnol. Bras. (Online), vol.33, e6, 2021
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Abstract

Abstract:: Aim: To determine the internal P loading potential of semiarid tropical reservoir sediment while verifying the driving factors that affect P release rates.

Methods: An experiment was performed with water and sediment from the reservoir Boqueirão de Parelhas in Brazil. The effects of three variables on P release were studied: air temperature (region average of 28 °C and 32 °C, simulating an increase of 4 °C), pH (region average of pH 8, more acidic pH 6 and more alkaline pH 10) and oxygen (presence and absence). In addition, P fractionation analysis was performed on the P forms in the sediment.

Results: It was found that the minimum P release was in an oxic treatment at pH 6 and temperature 28 °C (0.22 mg m-2 d-1 ± 0.13) and the maximum P release in an anoxic treatment at pH 10 and temperature 32 °C (2.1 mg m-2 d-1 ± 0.15). The total P in the sediment was 597 mg kg-1, and the major P form in the sediment was NaOH-rP, the P bound to aluminum, corresponding to 42% of the total P.

Conclusion: These results allow us to confirm that the sediment of the Boqueirão reservoir is susceptible to the release of P bound to aluminum due to the prevalence of this form in its sediments concomitant with the high temperatures and alkaline pH of the water. This scenario can be aggravated by climate change.

Keywords

eutrophication, phosphorus fractionation, internal loading, temperature increase

Resumo

Resumo: Objetivo: Determinar o potencial de fertilização interna de P do sedimento de reservatório tropical semiárido, ao mesmo tempo em que verificar os fatores que afetam as taxas de liberação de P.


Métodos: Foi realizado um experimento com água e sedimento do reservatório Boqueirão de Parelhas, Brasil. Foram estudados os efeitos de três variáveis na liberação de P: temperatura do ar (região média de 28 °C e 32 °C, simulando aumento de 4 °C), pH (região média de pH 8, pH mais ácido 6 e pH mais alcalino 10) e oxigênio (presença e ausência). Além disso, a análise de fracionamento de P foi realizada nas formas de P no sedimento.

Resultados: Verificou-se que a liberação mínima de P foi em tratamento óxico em pH 6 e temperatura 28 °C (0,22 mg m-2 d-1 ± 0,13) e a liberação máxima de P em tratamento anóxico em pH 10 e temperatura 32 °C (2,1 mg m-2 d-1 ± 0,15). O P total no sedimento foi 597 mg kg-1, e a principal forma de P no sedimento foi o NaOH-rP, o P ligado ao alumínio, correspondendo a 42% do P total.

Conclusão: Esses resultados nos permitem confirmar que o sedimento da represa do Boqueirão é suscetível à liberação de P ligado ao alumínio devido ao predomínio desta forma em seus sedimentos concomitante às altas temperaturas e pH alcalino da água. Esse cenário pode ser agravado pelas mudanças climáticas.
 

Palavras-chave

eutrofização, fracionamento de fósforo, fertilização interna, aumento da temperatura

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Submetido em:
20/10/2020

Aceito em:
09/03/2021

Publicado em:
23/04/2021

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