Conference proceeding
COS 52-9: Nitrogen removal and greenhouse gas production during spring stratification in a small eutrophic reservoir
The 94th ESA Annual Meeting
ESA Annual Meeting, 94
2009
Abstract
In recent decades anthropogenic activities have led to increased N inputs to freshwater systems and associated increases in harmful algal blooms and fish kills. Denitrification (DNF) and coupled dissimilatory nitrate reduction to ammonia/anaerobic ammonia oxidation
(DNRA/anammox) are microbially mediated anaerobic processes that reduce biologically available NO3-to N2 gas. While DNF and potentially DNRA/anammox are primary N-removal processes in freshwater systems, their temporal dynamics are poorly understood, particularly in reservoir systems. In addition, there are several N transformations, both aerobic (microbial oxidation of NH4+ to NO3-) and anaerobic (DNF), that produce N2O, a powerful greenhouse gas, as a byproduct. Environmental controls on N2O production in aquatic systems are also poorly constrained. Lacamas Lake, a small (1.3 km2) reservoir draining to the Columbia River, was sampled monthly along a vertical gradient in the deepest part of the reservoir (17m) from June 2007 to September 2008. A full factorial sediment incubation experiment was also conducted in August 2008 to test for nitrate and carbon limitation of N2O and N2 production as well as sediment NO3-uptake.
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Details
- Title
- COS 52-9: Nitrogen removal and greenhouse gas production during spring stratification in a small eutrophic reservoir
- Creators
- Bridget R DeemerJohn A Harrison
- Publication Details
- The 94th ESA Annual Meeting
- Conference
- ESA Annual Meeting, 94
- Academic Unit
- Environment, School of the (CAS)
- Identifiers
- 99900669518901842
- Language
- English
- Resource Type
- Conference proceeding