HR: 1340h
AN: B53A-0941    [Abstracts]
TI: Evaluation of the Effects of Iron Oxides on Soil Reducing Conditions and Methane Generation in Cambodian Wetland Rice Fields
AU: * Weaver, M
EM: mathewweaver@mail.boisestate.edu
AF: Department of Geosciencs, Boise State University, 1910 University Drive, Boise, ID 83725, United States
AU: Benner, S
AF: Department of Geosciencs, Boise State University, 1910 University Drive, Boise, ID 83725, United States
AU: Fendorf, S
AF: Department of Geological and Envirnomental Sciences, Stanford University, Stanford University, Stanford, CA 94305, United States
AU: Sampson, M
AF: Resource Revelopment Institute, RDI Campus Royal Brick Road Kean Svay, Kandal, Cambodia USA PO BOX 9144 Cambodia, Louisville, KY 40209, United States
AU: Leng, M
AF: Resource Revelopment Institute, RDI Campus Royal Brick Road Kean Svay, Kandal, Cambodia USA PO BOX 9144 Cambodia, Louisville, KY 40209, United States
AB: Atmospheric concentrations of methane have been steadily increasing over the last 100 years, which has given rise to research of wetland rice fields, recently identified as a major anthropomorphic source of methane. Establishment of experimental soil pots, cultivating an aromatic early variety rice strain in the Kean Svay District of Cambodia, have recently been carried out to evaluate methods to minimize methane release by promoting redox buffering by iron oxides. In the first series of experiments, iron oxides were added to the soils and the rate of change in reducing conditions and methanogenesis onset was monitored. In the second series of experiments, plots are subject to periodic drying cycles to promote rejuvenation of buffering iron oxides. Initial results indicate a delay in the onset of methanogenesis, and overall methane generation, in plots where initial iron oxides concentrations are elevated.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 1615 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912)
DE: 4806 Carbon cycling (0428)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting