Efeito da disponibilidade de nitrogênio no consumo de oxigênio   durante a mineralização de Scirpus cubensis da Lagoa do Infernão (São Paulo,   Brasil) - DOI: 10.4025/actascibiolsci.v29i2.524

Romilda Maria Alves de Lemos; Irineu Bianchini Junior; Marcela Bianchessi da Cunha Santino

doi:10.4025/actascibiolsci.v29i2.524

Effect of nitrogen availability on the oxygen consumption during mineralization of Scirpus cubensis from Infernão Lagoon (São Paulo-Brazil) - DOI: 10.4025/actascibiolsci.v29i2.524

Authors

Romilda Maria Alves de Lemos UFSCAR Author
Irineu Bianchini Junior UFSCAR Author
Marcela Bianchessi da Cunha Santino UFSCAR Author

DOI:

https://doi.org/10.4025/actascibiolsci.v29i2.524

Keywords:

decomposição, macrófitas, nitrogênio, consumo de oxigênio, MOP, MOD

Abstract

This study evaluated the influence of nitrogen additions in the oxygen uptake during decomposition of Scirpus cubensis, through laboratory assays. The dissolved oxygen, pH, electrical conductivity (EC) and water temperature were measured. The results showed an initial acidification that decreased gradually, indicating great release of reduced organic matter and subsequent CO₂ formation. The decomposition chambers with greater nitrate concentrations exhibited higher pH mean values. The temporal variation of EC showed a small increase and an abrupt increase with increasing nitrate concentrations. The maximum oxygen uptake increased up to 6.37 mg L^-1 of nitrate, then decreased. The deoxygenation rate showed an opposite trend from that observed for the oxygen uptake. The coefficients and maximum oxygen consumption related to the particulate detritus mineralization tended to increase with increasing nitrate concentration. The increase in nitrate levels affected the decomposition of each organic matter fraction in different ways, with the particulate organic matter being more easily degraded in richer nitrate concentrations than the dissolved organic matter.

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Author Biography

Romilda Maria Alves de Lemos, UFSCAR

Possui graduação em CIÊNCIAS BIOLÓGICAS (Ecologia) pela Universidade Federal do Rio de Janeiro (1988), mestrado em Ecologia e Recursos Naturais pela Universidade Federal de São Carlos (1995) e doutorado em Ciências pela Universidade Federal de São Carlos (2001). Atualmente é professora do ensino superior (adjunto) do Instituto Superior de Tecnologia (IST Paracambi) da Fundação de Apoio Ã Escola Técnica do Estado do Rio de Janeiro, onde orienta trabalhos na área de Ecologia/Limnologia. Tem interesse especial no estudo do papel de macrófitas aquáticas para o funcionamento de ecossistemas aquáticos e seu uso potencial em biomonitoramento e biorremediação de ambientes aquáticos

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Published

2007-12-05

Issue

Vol. 29 No. 2 (2007)

Section

Ecology and Limnology

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How to Cite

Effect of nitrogen availability on the oxygen consumption during mineralization of Scirpus cubensis from Infernão Lagoon (São Paulo-Brazil) - DOI: 10.4025/actascibiolsci.v29i2.524. (2007). Acta Scientiarum. Biological Sciences, 29(2), 177-183. https://doi.org/10.4025/actascibiolsci.v29i2.524