Poster # 42. Walker, Erin^*,1, Robertson, Treasha¹, Zak, John¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, TX Impact of changing water availability on plant photosynthetic performance in Big Bend National Park, Texas.

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Poster # 43. Liu, Xiaozhong^*,1, Luo, Yiqi¹, Wallace, Linda¹, ¹ University of Oklahoma, Norman, Oklahoma Relative effects of experimental warming on photosynthesis and respiration of C3 and C4 species in a tall grass prairie .

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Poster # 44. Robertson, Traesha^*,1, Walker, Erin¹, Zak, John¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, Texas Plant growth responses to timing and magnitude of precipitation Big Bend National Park.

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Poster # 45. English, Nathan^*,1, Williams, David¹, Weltzin, Jake², Fravolini, Alessandra¹, Thomas, Leigh², Andregg, Michael¹, ¹ University of Arizona, Tucson² University of Tennessee, Knoxville Implementation and monitoring of large-scale precipitation shelters on semi-arid grasslands, Santa Rita Experimental Range, Arizona.

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Poster # 46. Ahlquist, Lorraine^*,1, Oberbauer, Steven¹, ¹ Florida International Univerisity, Miami, FL Effects on soil and plant nutrients under an extended growing season plus soil warming: A climate change scenario.

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Poster # 47. McLauchlan, Kendra^*,1, Hobbie, Sarah¹, ¹ University of Minnesota, St. Paul, MN The consequences of conversion from conventional agriculture to perennial grassland for soil carbon dynamics .

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Poster # 48. Throop, Heather^*,1, Holland, Elisabeth², Parton, William³, Ojima, Dennis³, Keough, Cindy³, ¹ State University of New York, Stony Brook, New York² National Center for Atmospheric Research, Boulder, Colorado³ Natural Resources Ecology Laboratory, Fort Collins, Colorado Interactive effects of nitrogen deposition and insect herbivory on carbon and nitrogen dynamics: Results from CENTURY.

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Poster # 49. YAVITT, JOSEPH^*,1, ¹ Cornell University, Ithaca, NY Geomicrobiology of methanogens in peatlands of the discontinuous permafrost zone of boreal western continental Canada.

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Poster # 50. Menyailo, Oleg^*,1,2, Hungate, Bruce^2,3, ¹ Institute of Forest SB RAS, Krasnoyarsk, Russia² Northern Arizona University, Flagstaff, AZ, USA³ Merriam Powell Center for Environmental Research, Flagstaff, AZ, USA Siberian tree species alter potential production and consumption of greenhouse gases (CO₂, CH₄ and N₂O) by soil.

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Poster # 51. PANCOTTO, VERONICA^*,1, SALA, OSVALDO¹, CABELLO, MARTA², LOPEZ, NANCY³, BALLARE, CARLOS¹, CALDWELL, MARTYN⁴, SCOPEL, ANA¹, ¹ Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Buenos Aires, Argentina² Instituto Spegazzini, La Plata, . Argentina³ Facultad de Ciencias Exactas y Naturales- UBA, Buenos Aires, Argentina⁴ Utah State University, Logan UV-B affects decomposition and decomposers in a native ecosystem in Tierra del Fuego, Argentina.

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Poster # 53. Scherzer, Amy^*,1, Hom, John², ¹ USDA Forest Service, Delaware, OH² USDA Forest Service, Newtown Square, PA Physiological database of common eastern forest tree species growing in natural or experimentally altered conditions.

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Poster # 54. DAYEM, KATHERINE^*,1, BRESHEARS, DAVID¹, ALLEN, CRAIG², ¹ Los Alamos National Laboratory, Los Alamos, NM² US Geological Survey, Jemez Mountains Field Station, Los Alamos, NM Assessing ecosystem responses to changes in drought duration and intensity.

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