8:00 AM Knox, Robert^*,1, Hall, Forrest², Huemmrich, Karl², Gervin, Jannette¹, ¹ NASA's Goddard Space Flight Center, Greenbelt, MD² University of Maryland, Baltimore, MD Estimating terrestrial carbon exchange from space: How often and how well?

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8:15 AM Langdon, Chris¹, Broecker, Wallace S.², Hammond, Douglas E.³, Glenn, Edward⁴, Fitzsimmons, Kevin⁴, Nelson, Steven G.⁴, Peng, Tsung-Hung⁵, Hajdas, Irka⁶, ¹ Biosphere 2 Center of Columbia University, Oracle, AZ² Lamont-Doherty Earth Obs. of Columbia University, Palisades, NY³ Dept. of Earth Sciences, Uni. of S. California, Los Angeles, CA⁴ Environmental Research Laboratory, Uni. of Arizona, Tucson, AZ⁵ NOAA-AOML, Miami, FL⁶ IPP ETH Hoenggerberg, Zurich, Switzerland Effect of elevated CO₂ on the community metabolism of an experimental coral reef.

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8:30 AM Chambers, Jeffrey ^{*,1, 2, 3}, Toledo, Ligia², da Silva, Roseana², Tribuzy, Edgard², Martins, Liliane², dos Santos, Joaquim², Higuchi, Niro², Trumbore, Susan¹, ¹ University of California, Irvine, CA, USA² Instituto Nacional de Pesquisas da Amazonia, Manaus, Amazonas, Brazil³ Tulane University, New Orleans, LA, USA Ecological controls over net ecosystem productivity in a Central Amazon forest.

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8:45 AM Bergner, Belle^*,1, Johnstone, Jill², Treseder, Kathleen¹, ¹ University of Pennsylvania, Philadelphia, PA² University of Alaska-Fairbanks, Fairbanks, AK Experimental warming increases soil CO₂ flux but not microbial abundance in a recently burned Alaskan boreal forest.

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9:00 AM Cheng, Yufu^*,1, Oechel, Walter¹, Hastings, Steve¹, Bryant, Pablo¹, Qian, Yonghai¹, ¹ Global Change Research Group, San Diego, CA, USA Net ecosystem CO₂ fluxes in chaparral when grown under elevated and reduced atmospheric CO₂.

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9:15 AM Wolf, Amelia^*,1, Megonigal, Patrick¹, Hungate, Bruce², Day, Frank³, Drake, Bert¹, ¹ Smithsonian Environmental Research Center, Edgewater, MD² Northern Arizona University, Flagstaff, AZ³ Old Dominion University, Norfolk, VA Effects of elevated CO₂ on microbial respiration in a Florida scrub oak ecosystem.

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9:30 AM Lindroth, Richard ¹, Parsons, William², Bockheim, James³, ¹ University of Wisconsin, Madison, WI, USA² Universite Laval, Ste. Foy, Quebec, Canada³ University of Wisconsin, Madison, WI, USA Consequences of elevated carbon dioxide and ozone atmospheres for leaf litter decomposition at Aspen-FACE.

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9:45 AM Break.

10:00 AM Lichter, John¹, Barron, Stacy ¹, Finzi, Adrien², Schlesinger, William³, ¹ Bowdoin College, Brunswick, ME, USA² Boston University, Boston, MA, USA³ Duke University, Durham, NC, USA Soil carbon sequestration and turnover after six years of CO₂ enrichment at the Duke Forest.

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10:15 AM Pagel, Alisha^*,1, Day, Frank¹, Hungate, Bruce², Drake, Bert³, ¹ Old Dominion University, Norfolk, VA² Northern Arizona University, Flagstaff, AZ³ Smithsonian Environmental Research Center, Edgewater, MD Influence of elevated atmospheric CO₂ on root biomass accumulation in Florida oak-scrub.

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10:30 AM Wan, Shiqiang^*,1, Pregitzer, Kurt², O'Neill, Elizabeth¹, Norby, Richard¹, ¹ Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN² School of Forestry and Wood Products, Michigan Technological University, Houghton, MI Responses of roots of two deciduous tree species, Acer rubrum (red maple) and A. saccharum (sugar maple), to elevated CO₂ and temperature.

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10:45 AM Bazzaz, Fakhri^*,1, Wolfe-Bellin, Kelly¹, ¹ Harvard University, Cambridge, MA, USA Assemblages of annuals exhibit nonlinear responses to gradients of elevated air temperature and atmospheric CO₂.

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11:00 AM Wolfe-Bellin, Kelly^*,1, He, Jin-Sheng¹, Bazzaz, F.¹, ¹ Harvard University, Cambridge, MA Nonlinear responses of tree seedlings to gradients of superambient air temperature and atmospheric CO₂.

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11:15 AM Kim, Donggil^*,1, Mu, Shou Guo¹, Lee, Dowon¹, Chai, Namyi², Kim, Joon², ¹ Department of Environmental Planning, Seoul, Seoul, Korea² Department of Atmospheric Science, Seoul, Seoul, Korea Effects of a pulsing water addition to soil on CO₂ efflux.

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