8:00 AM Arnone, John^*,1, Schorran, David¹, Johnson, Dale², Wallace, Linda³, Luo, Yiqi³, Coleman, James¹, Schimel, David⁴, Verburg, Paul¹, ¹ Desert Research Institute, Reno, NV² University of Nevada, Reno, NV³ University of Oklahoma, Norman, OK⁴ National Center for Atmospheric Research, Boulder, CO NSF-I.R.C.E.B. Interannual climate variability and ecosystem processes in tallgrass prairie: Effects on ecosystem CO₂ fluxes.

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8:15 AM Prater, Margaret^*,1, Arnone, John², DeLucia, Evan¹, ¹ University of Illinois Urbana-Champaign, Urbana, IL² Desert Research Institute, Reno, NV Conversion of sagebrush to non-native communities following fire: Impacts of ecosystem carbon and water exchange.

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8:30 AM Gill, Richard^*,1, Polley, H. ², Johnson, Hyrum ², Jackson, Robert³, ¹ Washington State University, Pullman, WA² USDA-ARS, Grassland, Soil & Water Research Lab, Temple, TX³ Duke University, Durham, NC Short- and medium-term carbon and nitrogen dynamics in a grassland exposed to past and future atmospheric CO₂.

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8:45 AM TBA.

9:00 AM West, Jason^*,1, Wedin, David², Hobbie, Sarah¹, Reich, Peter¹, ¹ University of Minnesota, St. Paul, MN² University of Nebraska, Lincoln, NE The dominant role of plant species in controlling the response of N mineralization to altered plant diversity, atmospheric CO₂, and N deposition.

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9:15 AM Austin, Amy^*,1, Vivanco, Lucía¹, ¹ Faculty of Agronomy and IFEVA-CONICET, Buenos Aires, austin@ifeva.edu.ar, ARGENTINA Abiotic and biotic controls on litter decomposition in the semiarid Patagonian steppe.

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9:30 AM White, Carleton^*,1, Moore, Douglas¹, Craig, John¹, ¹ Biology Dept., Albuquerque, New Mexico Regional-scale drought increases potential soil fertility in semiarid grasslands.

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9:45 AM Break.

10:00 AM Dijkstra, Feike^*,1, Hobbie, Sarah¹, Reich, Peter¹, ¹ University of Minnesota, Saint Paul, Minnesota, USA Nitrogen losses and cycling affected by fire and vegetation in an oak savanna.

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10:15 AM Lewis, David^{*,1, 2}, Stabler, Linda³, Martin, Chris³, ¹ Center for Environmental Studies, Tempe, AZ, USA² Biology Department, Tempe, AZ, USA³ Plant Biology Department, Tempe, AZ, USA Ecological stoichiometry of horticulture: Consequences of pruning and water for plant nutrient use efficiency.

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10:30 AM Schade, John¹, Hobbie, Sarah², Sponseller, Ryan¹, Collins, Scott³, ¹ Arizona State University, Tempe, AZ² University of Minnesota, St. Paul, MN³ University of New Mexico, Albuquerque, NM Spatial and temporal variation in islands of fertility in a Sonoran Desert landscape.

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10:45 AM Stark, John¹, ¹ Department of Biology, Logan, UT, USA Plant carbon inputs regulate timing of nitrogen pulses in semiarid soils.

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11:00 AM Menge, Duncan^*,1, Field, Christopher^{1, 2}, ¹ Stanford University, Stanford, CA² Carnegie Institution of Washington, Stanford, CA Phosphorus dynamics under manipulated global change conditions in a California annual grassland.

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