Abstract
This study evaluated the influence of nitrogen additions in the oxygen uptake during decomposition of Scirpus cubensis, through laboratory assays. The dissol...
Highlights
The availability of oxygen used by microorganisms during respiration in aquatic environments has great ecological importance, affecting the nature and the final products of decomposition
Adult individuals of Scirpus cubensis Poepp and Kunth were collected at Infernão Lagoon (9/22/1992) and washed with lagoon water according to the procedures described by Ogburn III et al (1987)
The control samples followed the same pattern, but the pH values remained higher in the incubations, probably because these decomposition chambers had more organic matter owing to the addition of plant fragments
Summary
The availability of oxygen used by microorganisms during respiration in aquatic environments has great ecological importance, affecting the nature and the final products of decomposition. This study is included among others developed at the Infernão Lagoon, which is an oxbow lake situated in the Mogi-Guaçu River floodplain. It is located at 21o 35’ S and 47o 51’W, in São Paulo State, within the area comprising the Jataí Ecological Station. The area of the Ecological Station is still preserved, in spite of increased agro-industrial activities and urban centers in the surrounding area Both superficial and groundwater pollution are related to the presence of agrochemical substances (i.e., herbicides, insecticides, fertilizers, acaricides and fungicides) from agricultural activities, silviculture and detritus released by sugar cane industries operating in the area of the Mogi-Guaçu River floodplain (Santos and Mozeto, 1992). Emphasizing the eutrophication process, this study investigates, through laboratory assay, the influence of increased nitrogen concentration during decomposition of the emergent aquatic macrophyte Scirpus cubensis
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