HR: 0800h
AN: B51D-0257    [Abstracts]
TI: Quantitative Evaluation of the Factors Controlling Methane and Nitrous Oxide Emissions From Rice Fields in China.
AU: * Xiong, Z
EM: zhengqin@pdx.edu
AF: Portland State University, Department of Physics, P.O. Box 751, Portland, OR 97207-0751 United States
AU: Khalil, M K
EM: aslamk@pdx.edu
AF: Portland State University, Department of Physics, P.O. Box 751, Portland, OR 97207-0751 United States
AU: Shearer, M J
EM: mshearer@pdx.edu
AF: Portland State University, Department of Physics, P.O. Box 751, Portland, OR 97207-0751 United States
AU: Butenhoff, C L
EM: christop@global.phy.pdx.edu
AF: Portland State University, Department of Physics, P.O. Box 751, Portland, OR 97207-0751 United States
AU: Rasmussen, R A
EM: rei@ebs.ogi.edu
AF: Oregon Health & Science University, OGI School of Science, 20000 Walker Rd., Beaverton, OR 97006 United States
AU: Xu, L
EM: xuli@cma.gov.cn
AF: Chinese Meteorological Administration, National Climate Center, 46 Baishiqiao Road, Western Suburb, Beijing, 100081 China
AB: Experiments have shown that a few factors control the emissions of methane from rice fields. Among the most significant factors are intermittent vs continuous flooding of the fields and the use of organic vs. nitrogen fertilizers. Continuous flooding and organic fertilizers result in the highest emissions of methane while intermittent flooding and use of nitrogen fertilizers produce very little methane emissions. Use of nitrogen fertilizers produces nitrous oxide which is also measured in the present experiments. Until now no systematic experiments have been carried out to determine the quantitative relationship between these variables and the emissions of methane, the interactions between these variables or the relationship between methane and nitrous oxide emissions. In our present research we have adopted classical factorial experimental design and a unique set of experiments under controlled greenhouse conditions with a mirror experiment in the field near Nanjing, China. We will report the progress of the experiment after the first year of experimental results. The experiments are designed using a model of the processes governing methane emissions from rice fields. The results therefore, will be used to obtain a more accurate estimate of emissions from rice fields in China and the rest of the world. This research was supported by the Office of Science (BER), US Department of Energy, Grant No. DE-FG02-04ER63913.
DE: 0402 Agricultural systems
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0469 Nitrogen cycling
DE: 0490 Trace gases
SC: Biogeosciences [B]
MN: Fall Meeting 2005