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Dynamics of Phosphorous in an Amazonian Meromictic Black-Water Lake

Author Affiliations

  • 1Laboratory of Study of Amazonian Ecosystems, West of Pará Federal University, Av. Marechal Rondon s/n 68040-070 Pará, BRAZIL
  • 2 National Institute of Research of Amazonian, Av. André Araújo 2936, Manaus, AM 69060-001 BRAZIL

Int. Res. J. Environment Sci., Volume 2, Issue (10), Pages 28-38, October,22 (2013)

Abstract

This study proposed to find the main pathways of phosphorus (P) to a black water lake shore in Negro River (Central Amazonian), and develop a model of nutrient flow for fluvial-lacustrine ecosystems of black water with a pattern of meromixis water circulation. The levels of P in the compartments water, soil plus litter and sediment were evaluated from 2002 to 2011, and a mapping of distribution of P was developed. The results showed that the Negro River could not supply the black water lakes adjacent with P, leaving the forest streams a significant role in transporting the same, especially in the dissolved form. The flood-pulse of the Negro River does not contribute significantly to elevate levels of oxygen in the hypolimnion, and thus does not favor phosphorous ions precipitation to the sediment. The transport route of P comes from both the forest and streams of the adjacent river system depending on the hydrological period. The particular model for the phosphorous seeks to explain the process flow and the importance of anoxic condition in the hypolimnion to keep up the release of phosphate to the ecosystem.

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