Factors that control the spatial and temporal distributions of phosphorus, nitrogen, and carbon in the sediments of a tropical reservoir

Environmental Science and Pollution Research International
Sheila Cardoso-SilvaMarcelo Pompêo

Abstract

The impacts of anthropic activities have had profound effects on the nitrogen (N) and phosphorus (P) cycles in many aquatic ecosystems. We investigated the spatial and temporal distributions of carbon (C), N, and P in the sediments of a tropical Paiva Castro Reservoir (São Paulo, Brazil), as well as their release and retention in the system. In 2010, surface sediments were collected at nine sites in the reservoir, and a core was obtained in the limnetic zone, in 2010. The core was dated using the 210Pb technique. The organic C content was estimated from organic matter concentration, which was measured by the loss-on-ignition method, and the concentrations of P and N were determined by spectrophotometry. Marked spatial heterogeneity in the Paiva Castro sediments associated with both natural variations in the water body and variations induced by human impacts was observed. Heterogeneity was evidenced by a decrease in the allochthonous contribution of organic matter (C/N) in the upstream-downstream direction and increases of N and P, mainly associated with water flows in the different compartments of the reservoir. In the core, C and N concentrations display significant positive correlations with increases in population and agricu...Continue Reading

References

Feb 28, 2009·Trends in Ecology & Evolution·Val H Smith, David W Schindler
Apr 30, 2010·Marine Pollution Bulletin·Su Mei LiuGui Ling Zhang
Jan 13, 2012·Journal of Environmental Monitoring : JEM·Fengyu ZanKevin M Yeager
Apr 28, 2016·Environmental Monitoring and Assessment·Sheila Cardoso-SilvaMarcelo Pompêo
Feb 9, 2017·The Science of the Total Environment·Davi Gasparini Fernandes CunhaSteven Arthur Loiselle
Jul 15, 2017·Environmental Science and Pollution Research International·Xiaobin JiaFushun Wang
Sep 20, 2017·Environmental Science and Pollution Research International·Robert LadwigMichael Hupfer
Mar 10, 2018·Environmental Monitoring and Assessment·Daniele FrascareliViviane Moschini-Carlos

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