Scott D. Bridgham
Global Change Feedbacks on Trace Gas Fluxes in Wetlands
My lab has focused on numerous experiments that examine if and to what extent that climate change in wetlands will enhance fluxes of the two major greenhouse gases, carbon dioxide and methane. This has been a major focus on our whole-ecosystem climate change experiments (see: Manipulative Climate Change Experiment on Peatlands in Minnesota).
We also have examined soil carbon mineralization rates as carbon dioxide and methane in laboratory incubations and in situ in 17 peatlands in Minnesota, North Carolina, and Florida. These experiments have related gas production in the peat to soil carbon quality and other environmental variables in order to gain a better understanding of controls over inherent differences in the abilities of different peats and their microbial communities to mineralize carbon as carbon dioxide and methane (Bridgham et al. 1998).
Former Ph.D. student, Jason Keller (currently Smithsonian Environmental Research Center), focused his dissertation research on elucidating the relative importance of the acetoclastic versus autotrophic pathways of methanogenesis in a bog, acidic fen, and alkaline fen in northern Michigan. He also examined the relative contribution of different terminal electron acceptors to anaerobic carbon mineralization, finding a large unexplained production of anaerobic carbon dioxide that we ascribed to humic acids as terminal electron acceptors. In two separate projects, he examined how short-term and long-term fertilization with nitrogen and phosphorus and liming of peatlands affected methane production and consumption in peatlands.
Former Ph.D. student Melanie Vile (currently Villanova University) examined the role of atmospheric sulfur deposition in a pristine bog in central Alberta, Canada and two bogs in the Czech Republic with very high sulfur deposition on rates of sulfate reduction, methanogenesis, fermentation, and overall anaerobic carbon mineralization.
See curriculum vitae for relevant publications.
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