N and P mass balance in the water-sediment system of a coastal lagoon at the rio Doce Valley, state of Espírito Santo, Brazil
Keywords:
Mass balance, Atmospheric deposits, Phosphorus, Coastal lagoon, Mathematical model, NitrogenAbstract
A study was conducted of the mass balance of nitrogen and phosphorus in the water and sediment compartments of the Dourada lagoon, located in the lower Doce river valley on the Atlantic Coast of the state of Espírito Santo, Brazil. During rainy and dry seasons between 1993 and 1998. Water and sediment samples
were collected at six sampling stations to determine total phosphorus, organic nitrogen and organic matter. Physical and physical-chemical parameters were
also measured. The uniformity of the water column was explained by the shallowness of the lagoon, its morphology with a lengthened shape and favorable
location in terms of wind action, which is unpredictable in the coastal zones. There was a nutritional increment of allochthonous origin during the rainy season
in both water and sediments. The following processes were considered important to the flux model: marine spray and aerosols, as sources of allochthonous
phosphorus, and the rain and leaching as sources of nitrogen. The distance matrix between the studied parameters showed a greater equilibrium between
the concentrations of total phosphorus. Test t was applied to the variables and the results confirmed a continuous flow of phosphorus into the Dourada lake, as well as the seasonality of nitrogen. A mass balance model was constructed for the lake. This showed interdependence for phosphorus and independence for
nitrogen in the aquatic ecosystem. The principle of the model is to support the unified treatments of physical-chemical processes with the use of compartmental
and conceptual techniques. Based on the parameters investigated, the lake can be classified as mesotrophic to eutrophic.
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