Young organic matter as a source of carbon dioxide outgassing from Amazonian rivers

Article Abstract:

The results of an extensive survey of the carbon isotope composition of dissolved inorganic carbon and three size-fractions of organic carbon across the Amazonian river system are presented. The respiration of contemporary organic matter originating on land and near rivers is the dominant source of excess carbon dioxide that drives outgassing in medium to large rivers.

Carbon, Carbon isotopes, Carbon cycle (Biogeochemistry), Carbon cycle, Chemical properties, Amazon River, Inorganic carbon compounds

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Control of cation concentrations in stream waters by surface soil processes in an amazonian watershed

Article Abstract:

Research is presented concerning the analysis of water and soil chemistry data in the Brazilian Amazon from a 10,000-hectare watershed consisting of highly weathered soil. Streamwater cation concentrations are discussed.

Natural history, Letter to the Editor, Water chemistry, Cations, Soil chemistry, Amazon River Region

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Recuperation of nitrogen cycling in Amazonian forests following agricultural abandonment

Article Abstract:

The article discusses the methods used to re-grow young forests on old unused agricultural lowlands in the Amazon basin using nutrients from Nitrogen and Phosphorus.

Methods, Nitrogen cycle, Forest reproduction

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