8:30 AM Luo, Yiqi^*,1, NCEAS N working group, ², ¹ University of Oklahoma, Norman, OK² University of California, Santa Barbara, CA Nitrogen limitation of ecosystem responses to rising atmospheric CO₂: Patterns and mechanisms.

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8:55 AM Parton, William^*,1, Delgrosso, Steve¹, Ojima, Dennis ¹, Mosier, Arvin², Morgan, Jack², ¹ Colorado State University, Fort Collins, CO, USA² USDA-ARS, Fort Collins, CO, USA Simulated Nitrogen Constraints on Elevated CO2 Responses for Grasslands and Forests.

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9:20 AM Finzi, Adrien^*,1, DeLucia, Evan², Lichter, John³, Sinsabaugh, Robert⁴, Schlesinger, William⁵, ¹ Boston University, Boston, MA, USA² University of Illinois, Urbana, IL, USA³ Bowdoin College, Brunswick, ME, USA⁴ University of New Mexico, Albaquerque, NM, USA⁵ Duke University, Durham, NC, USA Progressive nitrogen limitation to ecosystem function in the Duke Forest FACE Experiment.

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9:45 AM Norby, Richard^*,1, Jawdy, Sara¹, Ledford, Joanne¹, Sholtis, Johnna², Johnson, Dale³, ¹ Oak Ridge National Laboratory, Oak Ridge, TN² Texas Tech University, Lubbock, TX³ University of Nevada-Reno, Reno, NV Increased nitrogen uptake supports higher NPP but not carbon storage in CO₂-enriched sweetgum trees.

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10:10 AM Hungate, Bruce^*,1, ¹ Northern Arizona University, Flagstaff, Arizona Progressive nitrogen limitation in grasslands in response to elevated CO₂.

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10:35 AM Break.

10:45 AM Zak, Donald^*,1, Holmes, William¹, Finzi, Adrien², Norby, Richard³, Schlesinger, William⁴, ¹ University of Michigan, Ann Arbor, Michigan² University of Boston, Boston, Massachusetts³ Oak Ridge National Laboratory, Oak Ridge, Tennessee⁴ Duke University, Durham, North Carolina Soil Nitrogen Cycling Under Elevated CO₂: A Synthesis of Forest FACE Experiments.

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11:10 AM Hu, Shuijin^*,1, ¹ North Carolina State University, Raleigh, NC, USA Nitrogen limitation to soil microorganisms under elevated CO₂.

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11:35 AM Field, Christopher^*,1, ¹ Carnegie Institution, Stanford, California Policy implications of carbon-nitrogen interactions.

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