IMPACT4SOIL OpenAire NERC Open Research Archive Crossref Microsoft Academic Graph Europe PubMed Central Environmental Science &amp; Technology Closed Access 2007-03-29 Peatlands export more dissolved organic carbon (DOC) than any other biome, contributing 20% of all terrestrial DOC exported to the oceans. Both warming and elevated atmospheric CO2 (eCO2) can increase DOC exports, but their interaction is poorly understood. Peat monoliths were, therefore, exposed to eCO2, warming and eCO2 + warming (combined). The combined treatment produced a synergistic (i.e., significant interaction) rise in DOC concentrations available for export (119% higher than the control, interaction P < 0.05) and enriched this pool with phenolic compounds (284%). We attribute this to increased plant inputs, coupled with impaired microbial degradation induced by competition with the vegetation for nutrients and inhibitory phenolics. Root biomass showed a synergistic increase (407% relative to the control, P < 0.1 only), while exudate inputs increased additively. Phenol oxidase was suppressed synergistically (58%, interaction P < 0.1 only) and beta-glucosidase (27%) additively, while microbial nutritional stress increased (51%) additively. Such results suggest intensified carbon exports from peatlands, with potentially widespread ramifications for aquatic processes in the receiving waters. Nitrogen litter decomposition Bryophyta 01 natural sciences sphagnum soil Magnoliopsida Soil Phenols 0105 earth and related environmental sciences Monophenol Monooxygenase beta-Glucosidase Temperature temperature 04 agricultural and veterinary sciences Carbon Dioxide 15. Life on land dissolved organic carbon matter Carbon Phosphoric Monoester Hydrolases 6. Clean water enzyme bog 13. Climate action community 0401 agriculture, forestry, and fisheries Fenner, Nathalie, Freeman, Christopher, Lock, Maurice A., Harmens, Harry, Reynolds, Brian, Sparks, Tim, 2007-03-29 journalpaper Peatlands export more dissolved organic carbon (DOC) than any other biome, contributing 20% of all terrestrial DOC exported to the oceans. Both warming and elevated atmospheric CO2 (eCO2) can increase DOC exports, but their interaction is poorly understood. Peat monoliths were, therefore, exposed to eCO2, warming and eCO2 + warming (combined). The combined treatment produced a synergistic (i.e., significant interaction) rise in DOC concentrations available for export (119% higher than the control, interaction P < 0.05) and enriched this pool with phenolic compounds (284%). We attribute this to increased plant inputs, coupled with impaired microbial degradation induced by competition with the vegetation for nutrients and inhibitory phenolics. Root biomass showed a synergistic increase (407% relative to the control, P < 0.1 only), while exudate inputs increased additively. Phenol oxidase was suppressed synergistically (58%, interaction P < 0.1 only) and beta-glucosidase (27%) additively, while microbial nutritional stress increased (51%) additively. Such results suggest intensified carbon exports from peatlands, with potentially widespread ramifications for aquatic processes in the receiving waters. Interactions Between Elevated Co2 And Warming Could Amplify Doc Exports From Peatland Catchments 10.1021/es061765v https://doi.org/10.1021/es061765v