Downstream changes in free carbon dioxide in an upland catchment from Northeastern Scotland

摘要: Significant losses of free carbon dioxide (CO 2 ) to the atmosphere are likely occur when soil-water, supersaturated with CO , enters streams and equilibrates atmospheric Spatial changes in dissolved downstream from river source should therefore demonstrate progressive equilibration Data on spatial diurnal variation concentration described for a small headwater stream draining an acidic heather [Calluna vulgaris (L.) Hull] moorland catchment northeastern Scotland. The degree which exceeded expected decreased rapidly downstream, excess partial pressure (epCO >10 at ca. 1.5 over distance km suggesting that was being lost water by outgassing as equilibrated Diurnal ±1.0 units also measured lowest point stream, levels highest during early morning late evening (measurements were not taken times darkness) period midafternoon. An estimate flux C suggests it comprises 10% combined fluxes organic (DOC) particulate (POC). These results suggest transport within systems soil-derived forms important component terrestrial ecosystems back or ocean.