Análise das correlações entre fósforo total e clorofila a em reservatórios do Ceará, Brasil

Bruna Monallize Duarte Moura Guimarães; Iran Eduardo Lima Neto

doi:10.5327/Z2176-94781521

Autores

Bruna Monallize Duarte Moura Guimarães Universidade Federal do Ceará (UFC) - Brasil https://orcid.org/0000-0003-0599-4131
Iran Eduardo Lima Neto Universidade Federal do Ceará (UFC) - Brasil https://orcid.org/0000-0001-8612-5848

DOI:

https://doi.org/10.5327/Z2176-94781521

Palavras-chave:

nutrientes; semiárido; eutrofização; qualidade da água

Resumo

Reservatórios em todo o mundo são susceptíveis à degradação da qualidade da água em razão do aumento da produção primária, e a necessidade de entender os fatores que a influenciam é questão fundamental para o controle da eutrofização. O objetivo deste estudo foi analisar a correlação entre fósforo total (PT) e clorofila a (Cla) em 155 reservatórios localizados no estado do Ceará, Brasil. Esta análise foi realizada por meio do levantamento de dados históricos (2008–2021) monitorados e divulgados pela companhia de gestão de recursos hídricos do estado. A relação entre PT e Cla foi analisada por meio de ajustes simples, utilizando como métrica de avaliação o desempenho do coeficiente de determinação (R²). Posteriormente, investigou-se como a dinâmica desses ajustes pode ser influenciada com relação à bacia hidrográfica, ao porte do reservatório, ao estado trófico (quanto à concentração de Cla e PT) e ao coeficiente de variabilidade volumétrica. De forma geral, os ajustes resultaram em modelos insatisfatórios (R² < 0,4) para a maioria dos reservatórios (n = 115). Esses modelos, apesar de insatisfatórios, seguem as tendências de modelos literários clássicos, mostrando que na maioria das bacias a disponibilidade de PT na coluna d’água favorece o aumento da concentração de Cla. A análise dos fatores que influenciam o padrão e a dispersão dos ajustes entre Cla e PT demonstrou que a performancedos R² está relacionada às diferentes bacias hidrográficas, à variabilidade volumétrica e às concentrações de Cla. A variância entre os R² de reservatórios de diferentes portes e estados tróficos conforme a concentração de PT não foi significativa.

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