caa a22 4500 605517436 CHVBK 20210128100719.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s10533-015-0143-y doi (NATIONALLICENCE)springer-10.1007/s10533-015-0143-y Linking dissolved carbon dioxide to dissolved organic matter quality in streams [Elektronische Daten] [Sarah D'Amario, Marguerite Xenopoulos] Streams are typically supersaturated with carbon dioxide (CO2) thus playing a pivotal role in the global carbon cycle. To further our knowledge on stream CO2 dynamics, we tested the linkages between dissolved CO2 and dissolved organic matter quality during two time periods (spring and summer). We sampled 48 streams in Ontario, Canada that represent a range of catchment cropland cover (2-80%), nutrients, dissolved organic carbon concentration (DOC), and dissolved organic matter (DOM) quality. For both sampling periods, DOM composition (quality) was found to be an important predictor of CO2 concentration in streams, more so than DOC concentration. In general, the more complex terrestrially-derived DOM was associated with elevated CO2 levels whereas microbial-like DOM had a poor relationship with CO2. The DOM characteristics associated with increased CO2 levels were related to wetlands rather than croplands. Nutrients (nitrogen and phosphorus) were also important predictors of CO2, however this relationship was not linear. Since the streams in the sampled network were of mixed land use, it appears that CO2 levels were affected by both land use types in a composite non-linear way. Overall, our findings suggest that DOM quality is a better predictor of stream CO2, however the relationship between DOM and CO2 is complicated by the presence of breakpoints in the data associated with non-linearity. Springer International Publishing Switzerland, 2015 Dissolved organic matter nationallicence PARAFAC nationallicence Nutrients nationallicence Streams nationallicence Dissolved CO2 nationallicence Cropland nationallicence Wetlands nationallicence D'Amario Sarah Department of Biology, Trent University, Peterborough, ON, Canada aut Xenopoulos Marguerite Department of Biology, Trent University, Peterborough, ON, Canada aut Biogeochemistry Springer International Publishing 126/1-2(2015-11-01), 99-114 0168-2563 126:1-2<99 2015 126 10533 https://doi.org/10.1007/s10533-015-0143-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0143-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- D'Amario Sarah Department of Biology, Trent University, Peterborough, ON, Canada aut NATIONALLICENCE 700 1- Xenopoulos Marguerite Department of Biology, Trent University, Peterborough, ON, Canada aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 126/1-2(2015-11-01), 99-114 0168-2563 126:1-2<99 2015 126 10533