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Title: The analysis of the seasonal, spatial and compositional distribution of humic substances in a subtropical shallow lake
Authors: Mazzuoli,
Loiselle, Steven Arthur 
Hull, V.
Bracchini, L.
Rossi, Claudio 
Keywords: Fulvic Acid; Humic Acid; Molecular Absorbance Spectroscopy; Wetlands
Issue Date: 2003
Project: None 
The spatial and temporal distribution of humic substances in aquatic ecosystems can have important effects on ecosystem productivity, negatively impacting primary productivitywhile positively impacting secondary productivity. In the present investigation, a large shallow lake ecosystem was studied to determine the spatial and seasonal variation of theHydrobiology, composition and concentration of humic substances. Concentrations of total dissolved orMinisterof Agriculture, ganic matter, humic acid, and fulvic acid were found to display significant spatial distributions (1.3...13.5 mg/L, DOM; 0.1...5.4 mg/L, HA). The distribution is described by usingmapping techniques and the analysis of the spatial distribution of the lake. An analysis ofthe seasonal variations also indicated the dependence of the occurrence of these compoundson meteorological and hydrological conditions.To identify the potential sources of these organic materials, an analysis was made of theratio of humic and fulvic acid fractions and total DOM. It was found that areas of high DOMconcentration coincided with the areas of highest HA percentage of total DOM. Furthermoreusing the ratio of the normalised concentrations of HA, FA, and residual DOM(< 5000 g/mol) it was found that areas dominated by each are spatially distinct. Thisconfirms the hypothesis that in these shallow lakes, photodegradation and bacterioplanktonactivity will create a residence time dependent zonation of each component of thetotal DOM.
ISSN: 0323-4320
DOI: 10.1002/aheh.200300509
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