OOS 45 - Iron: A Catalyst for Redox-Driven Biogeochemical Cycling In Terrestrial Ecosystems

Thursday, August 9, 2012: 1:30 PM-5:00 PM
C124, Oregon Convention Center
Whendee Silver, University of California
Wendy H. Yang, University of Illinois, Urbana-Champaign
Wendy H. Yang, University of Illinois, Urbana-Champaign
Soils are generally rich in iron, the fourth most abundant element in Earth’s crust. Changes in the redox state of iron can be coupled to the biogeochemical cycling of carbon, nitrogen, and phosphorus through both biotic and abiotic processes. The importance of iron in catalyzing redox-driven biogeochemical cycling has been underappreciated in terrestrial ecosystems because they are not typically thought of as anaerobic environments. However, soils can experience anaerobic conditions following rainfall events or in microsites of high biological oxygen consumption. The goal of this session is to bring together researchers from a range of backgrounds (e.g., geochemistry, microbiology, ecology, biogeochemistry) to highlight novel processes that couple iron cycling to carbon, nitrogen, and phosphorus cycling as well as explore the mechanisms that may control these interactions.
1:30 PM
 Rhizogenic C-Fe redox cycling in non-wetland terrestrial ecosystems
Daniel deB Richter, Duke University; Allan R. Bacon, Duke University
1:50 PM
 Ferrous iron oxidation: An unexplored mechanism for soil organic matter decomposition
Steven J. Hall, University of California-Berkeley; Whendee Silver, University of California
2:10 PM
 Biogeochemical transformations of  Iron-bearing soil minerals along a redox gradient: Implication for C cycling
Chunmei Chen, University of Delaware; Tappero Tappero, Brookhaven National Laboratory; James J. Dynes, Canadian Light Source; Jian Wang, Canadian Light Source; Chithra Karunakaran, Canadian Light Source; Donald L. Sparks, University of Delaware
2:30 PM
 The role of microbial Fe reduction in regulating CO2 and CH4 production in an Arctic ecosystem
David A. Lipson, San Diego State University; Kimberley E. Miller, San Diego State University; Theodore K. Raab, Stanford University
3:10 PM
3:40 PM
 Rock and the role of nitrogen in the iron cycle
Karrie A. Weber, University of Nebraska; Wendy H. Yang, University of Illinois, Urbana-Champaign; Whendee L. Silver, University of California, Berkeley
4:00 PM
See more of: Organized Oral Session