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Optical characterization of dissolved organic matter in tropical rivers of the Guayana Shield, Venezuela

溶解有机碳 生物地球化学 环境科学 有色溶解有机物 支流 流域 水质 水文学(农业) 水生植物 有机质 生物地球化学循环 出院手续 环境化学 生态学 海洋学 地质学 化学 浮游植物 营养物 地理 生物 岩土工程 地图学
作者
Youhei Yamashita,Nagamitsu Maie,Henry O. Briceño,Rudolf Jaffé
出处
期刊:Journal of Geophysical Research [American Geophysical Union]
卷期号:115 (G1) 被引量:187
标识
DOI:10.1029/2009jg000987
摘要

Tropical rivers are an important source of dissolved organic matter (DOM) to coastal oceans. However, temporal and spatial variability of DOM composition and thus its quality in such rivers, on landscape and basin scales, have not been well documented. In this study, we present data on the spatial distribution of DOM quantity and quality based on source, molecular weight, and composition using optical properties including excitation emission matrix fluorescence with parallel factor analysis. We compared such DOM quantity and quality determinations in main river channels and their tributaries for three river systems of the Guayana Shield, Venezuela. Spatial variabilities of DOM parameters were strongly related to differences in the geological settings of the drainage basins and presumably their associated vegetation cover. Linear relationships between quantitative and qualitative DOM parameters were also evident, suggesting that high DOC concentration correlated with chromophoric dissolved organic matter (CDOM) characteristics of higher molecular weight associated with terrestrial sources, while low DOC concentrations correlated with CDOM characteristics of lower molecular weight associated primarily with microbial sources. Such relationships seem to imply that DOM concentrations and their sources/characteristics may be coupled in the studied fluvial systems. In addition, shifts in DOM compositions between terrestrial and microbial signals were observed with changes in water discharge and in watersheds disturbed by gold mining activities. The observed linkages between, and the changes among DOM quantity and quality, suggest that the biogeochemistry of DOM in tropical rivers may be quite sensitive to climatic and land use change.
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