Efeitos da eutrofização e da composição de espécies de macrófitas sob a emissão de gases de efeito estufa em lagos rasos

• Autor(a) principal: Carlos, Anderson Ricardo [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203878; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-01-28/000898469.pdf
• topic: Eutroficação; Dioxido de carbono; Macrófitas aquáticas; Lagos; Eutrophication

Recent research indicates that eutrophication can concomitantly lead to higher greenhouse gas (GHG) emissions, in turn promoting climate change. Eutrophication tends to increase carbon dioxide (CO2) fixation in fresh water systems which might seem positive for global warming perspective. Nevertheless, eutrophication also promotes to increased absolute production and respiration, greater release of more nitrous oxide (N2O) and methane (CH4). Furthermore, the understanding about GHG flux pathways and the influence of macrophytes in the process still remain unclear. Therefore, this study intends to clarify the effects of eutrophication and macrophyte species on GHG specially from shallow lakes - historically ignored from GHG budgets estimates. This research also craves to expand the understanding of the CO2, CH4 and N2O emissions (diffusion and ebullition), evaluating the GHG production in sediments and the consume of methane by oxidation, and their relation to the oxygen profile in the water. In order to evaluade these factors, 9 artifical ponds were studied over eight months of measurements where 3 levels of eutrophication were created through P and N addition (high, intermediate and low nutrient loadings) and each pond was divided in quarters, which contained one of the different species in each one: floating plant (Azolla filiculoides) or three submerged plants (Ceratophyllum demersum, Elodea canadensis and Myriophyllum spicatum)...