Carbon and oxygen fluxes from a small pond to the atmosphere: Temporal variability and the CO2/O2 imbalance

摘要: [1] Because of the relative strength sediment processes compared to water column processes, natural and anthropogenic ponds represent an important component terrestrial hydrologic cycle a site for recycling carbon atmosphere. Over 250 d dissolved oxygen dioxide concentrations were measured on 0.5 h timescale in small Connecticut pond. Using approximately 8000 half-hour time intervals, Mirror Lake (Storrs, Connecticut) exhibits net annual fluxes 2002 2003 80 86 mmol CO2 m−2 d−1 (±26%) 25 −7.5 O2 (±20%), respectively (positive flux is atmosphere). The instantaneous (0.5 h) both atmosphere exhibit standard deviation (measured every order 100%, indicating high degree daily, weekly, seasonal variability controlling two gases rarely follow Redfield ratio stoichiometry. This agrees with range from various shallow inland aquatic waters. mass balances, minimum bacterial production pond estimated be 100 81mmol (same as pond), importance dynamics. Bacterial pathways that utilize NO3−1 or fermentation strongly favor consumption may provide mechanistic explanation (instantaneous annual) imbalance ratio. Thus, while man-made do advantages flood control, settling, some contaminant removal, also locus processing into source Given number their location cycle, systems coupling hydrology worthy greater investigation.