Poster # 20. Allwright, Michael^*,1, Dijkstra, Paul¹, Hungate, Bruce¹, Menyailo, Oleg¹, Belka, Stevi¹, Granum, Sam¹, ¹ Northern Arizona University, Flagstaff, AZ Trace gas fluxes along an elevational gradient in northern Arizona.

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Poster # 21. van Haren, Joost^*,1, Lin, Guanghui¹, Colodner, Debra², ¹ Columbia University, Biosphere 2 Center, Oracle, AZ 85623² Flandrau Science Center, University of Arizona, Tucson, AZ 85719 Soil moisture control on nitrous oxide fluxes in a large enclosed rainforest ecosystem .

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Poster # 22. Gordon, Wendy^*,1, Famiglietti, James², Fowler, Norma¹, ¹ Section of Integrative Biology, Austin, TX² Department of Earth System Science, Irvine, CA Analysis of 21^st century runoff under elevated CO₂ using the VEMAP II data set.

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Poster # 23. Noormets, Asko^*,1, Chen, Jiquan¹, Bridgham, Scott², Pastor, John³, Weltzin, Jake⁴, Harth, Calvin², Dewey, Brad², LeMoine, James¹, ¹ The University of Toledo, Toledo, Ohio, USA² University of Notre Dame, Notre Dame, Indiana, USA³ University of Minnesota, Duluth, Minnesota, USA⁴ University of Tennessee, Knoxville, Tennessee, USA The effect of infrared loading and soil water table on soil energy fluxes in northern peatlands.

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Poster # 24. Lenihan, James^*,2, Bachelet, Dominique¹, Drapek, Raymond², Neilson, Ronald², ² US Forest Service Pacific Northwest Research Lab, Corvallis, OR¹ Oregon State University, Corvallis, OR Climate change effects on vegetation distribution, carbon stocks, and fire regimes in California.

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Poster # 25. Sternberg, Marcelo^*,1, Holzapfel, Claus¹, PARAG, HADAS², TIELBRGER, KATJA², KIGEL, JAIME³, ¹ Tel Aviv University, Tel Aviv, Israel² University of Potsdam, Potsdam, Germany³ Hebrew University of Jerusalem, Rehovot, Israel Climate control of annual plant-shrub coexistence.

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Poster # 26. Roden, John^*,1, ¹ Southern Oregon University, Ashland, OR Preliminary data on the variability of oxygen isotope ratios of tree ring cellulose for coast redwood.

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Poster # 27. Honnay, Olivier^*,1, Verheyen, Kris¹, Bossuyt, Beatrijs¹, Butaye, Jan¹, Jacquemyn, Hans¹, Hermy, Martin¹, ¹ Laboratory for Forest, Nature & Landscape Research, Leuven, Belgium The effects of habitat fragmentation and climate change on the range of forest plant species.

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Poster # 28. Robson, Thomas^*,1, Ballar, Carlos², Sala, Osvaldo², Scopel, Ana², Caldwell, Martyn¹, ¹ Utah State University, Logan, Utah.² IFEVA-CONICET, Universidad de Buenos Aires, Capital Federal, Buenos Aires, Argentina. Response of a Tierra del Fuego peatland to six field seasons of UV-B radiation manipulation.

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Poster # 29. Coleman, Robert^*,1, Day, Thomas¹, ¹ Arizona State University, Tempe, Arizona Plant responses to four levels of sub-ambient UV-B radiation: investigating the saturation hypothesis.

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Poster # 30. Ziska, Lewis^*,1, Gebhard, Dennis², Frenz, David², Faulkner, Shaun¹, Singer, Benjamin³, Straka, James³, ¹ USDA-ARS, Beltsville, Maryland² Surveillance Data Incorporated, St Louis Park, Minnesota³ Macalester College, St. Paul, Minnesota Ragweed pollen production in respons to urban-induced CO₂/temperature gradients.

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