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River ecosystems receive a large amount of organic matter, which will increase the production of greenhouse gases (GHGs), including carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O). Despite extensive research on the distribution of greenhouse gases and dissolved organic matter (DOM), little is known about the associations between greenhouse gases and DOM compositions. In this study, the distributions of GHGs (CO 2 , CH 4  and N 2 O) and DOM in the overlying water of the main rivers around Taihu Lake were investigated. The results showed that the concentration of GHGs was positively correlated with dissolved organic carbon concentrations. Three-dimensional excitation-emission matrix fluorescence spectroscopy techniques were employed to identify the source of the DOM, which was related to protein-like and humic-like components. The DOM was a combination of terrigenous and endogenous origins. The GHGs (except CO 2 ) were significantly associated with DOM composition. These results emphasize the importance of the relationship between GHGs (CO 2 , CH 4  and N 2 O) and DOM compositions in river ecosystems.

Association between greenhouse gases and dissolved organic matter composition in the main rivers around Taihu Lake