Dissolved organic matter derived from wetlands in tropical to cool temperate regions : Evaluation of the functions and dynamics based on structural properties

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Structural property of dissolved organic matter (DOM) in river water derived from wetlands in tropic (Malaysia), subtropic (Florida, USA), and cool temperate (Hokkaido) regions were characterized by various spectroscopic and degradation analyses. Biodegradability of DOM was small and non-humic substances were mainly decomposed, while humic substances were very sensitive to photodegradation. There were no significant differences in the rates of biological or photochemical decomposition of DOM components among the three sites. These results indicated that the dynamics of wetland-originated DOM in various climatic regions could be estimated by same indices including the ratio of humic and non-humic substances, carbon composition, and excitation-emission matrix.