ANÁLISE E MODELAGEM DAS RELAÇÕES ENTRE NUTRIENTES E FITOPLÂNCTON EM RESERVATÓRIOS DO CEARÁ

• Autor(a) principal: Rocha, Sofia Midauar Gondim
• Data de Publicação: 2019
• Outros Autores: Mesquita, Janine Brandão de Farias, Lima Neto, Iran Eduardo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Brasileira de Ciências Ambientais (Online)
• Texto Completo: https://www.rbciamb.com.br/Publicacoes_RBCIAMB/article/view/536
• topic: eutrofização, reservatórios, qualidade da água, semiárido; eutrophication, reservoirs, water quality, semiarid

This research aimed to analyze the relationships between total phosphorus(P), total nitrogen (N), and chlorophyll a (Cla) in a small urban reservoir and inrural reservoirs. A field study was carried out on the urban reservoir, located atFortaleza, Ceará, to analyze the water quality parameters and then compare theresults with historical data of 35 rural reservoirs located in the semiarid regionof the Brazilian northeast, in the state of Ceará. Empirical correlations weredeveloped among these nutrients and Cla. Then, different levels of nutrient loadreduction were analyzed with the empirical correlations obtained and the waterquality complete moisture hypothesis, whose phosphorus decay coefficientused was the one developed for semiarid regions. The results showed that Pbest described the concentration of Cla in all reservoirs, using power adjustmentequations. It was also shown that the concentrations of P in the urbanreservoir were higher than those of the rural ones, with a mean of 1,76 mg/Land a N:P correlation of approximately 1, while the rural reservoirs had meanconcentrations between 0,04 – 0,59 mg/L and N:P between 5 – 50. The analysisof the different load scenarios showed that different levels of P load reductioncould be adopted depending on the P and Cla concentrations desired. Finally,it was concluded that the models proposed are applicable and useful as a meansto aid decision making in the management of water resources.