masterThesis
Emissões naturais e antrópicas de nitrogênio e fósforo para os principais açudes da bacia hidrográfica do Rio Seridó, RN
Fecha
2011-06-21Registro en:
VASCONCELOS, Vitor Hugo Fernandes de. Emissões naturais e antrópicas de nitrogênio e fósforo para os principais açudes da bacia hidrográfica do Rio Seridó, RN. 2011. 60f. Dissertação (Mestrado em Ecologia) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2011.
Autor
Vasconcelos, Vitor Hugo Fernandes de
Resumen
Eutrophication constitutes the main cause of water quality loss in reservoirs of Brazilian semiarid region. However, there are no quantitative studies about the relative importance of different nutrients sources for eutrophication of reservoirs as there are no control effective action to control the nutrients external loads to these reservoirs. The present study aimed to estimate the potential natural and anthropogenic emissions of nitrogen (N) and phosphorus (P) for the seven largest reservoirs of Seridó River watershed, in the Rio Grande do Norte semiarid region. The results show that the total emission range from 1955 t.N.ano-1 e 1180 t.P.ano-1 (Passagem das Traíras) a 84 t.N.ano-1 and 56 t.P.ano-1 (Carnaúba). The anthropogenic emissions are currently responsible for 72-87% of all nitrogen emissions and more than 98% of all phosphorus emissions to the reservoirs. Among the natural emissions, emissions from atmospheric deposition are higher for P and lower to N when compared to the physical and chemical soils denudation. Among the anthropogenic emissions, N and P emissions from husbandry are the larger than emissions from domestic sewage and agriculture. These results should support environmental management programs and watershed restoration projects of eutrophic reservoirs.