Poster # 95. Cardon, Zoe¹, Tyser, Deborah¹, Moussy, Francis², ¹ University of Connecticut, Storrs, CT² University of South Florida, Tampa, FL A new, nondestructive window into dynamics of sugar concentrations around plant roots in the field.

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Poster # 96. Wayson, Craig^*,1, Randolph, JC¹, Schmid, Hans Peter¹, ¹ Indiana University, Bloomington, Indiana Comparison of methods to estimate annual soil respiration in a mid-latitude deciduous forest.

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Poster # 97. Clark, James^*,1, Johnson, Loretta¹, Suelter, Tyler¹, Koelliker, James², Knapp, Alan¹, ¹ Division of Biology, Manhattan, KS, USA² Department of Biological and Agricultural Engineering, Manhattan, KS, USA Response of belowground carbon cycling to water and nitrogen in tallgrass prairie.

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Poster # 98. Gleeson, Scott¹, Tilman, David², ¹ University of Kentucky, Lexington, KY² University of Minnesota, St. Paul, MN Nitrogen saturation and resource isoclines during grassland succession.

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Poster # 99. Welch, Nicole^*,1, Belmont, Jonathon², Randolph, J.C.², ¹ Middle Tennessee State University, Murfreesboro, TN² Indiana University, Bloomington, IN Carbon and macronutrient content of herb layer vegetation in an Indiana temperate deciduous forest.

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Poster # 100. Steinaker, Diego^*,1, Wilson, Scott¹, ¹ University of Regina, Canada, Regina, Saskatchewan, Canada Above- and belowground contributions to nitrogen cycling in aspen forest and northern prairie.

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Poster # 102. Diekmann, Lucy^*,1, Lawrence, Deborah¹, ¹ University of Virginia, Charlottesville, VA, USA Changes in soil phosphorus following shifting cultivation in the Yucatan Peninsula.

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Poster # 103. Yanai, Ruth¹, Hamburg, Steven², Arthur, Mary³, Blum, Joel⁴, ¹ SUNY-ESF, Syracuse, NY² Brown University, Providence, RI³ U of Kentucky, Lexington, KY⁴ U of Michigan, Ann Arbor, MI Whether repeated harvest and acid rain threaten calcium supply in northern hardwood forests may depend on apatite weathering.

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Poster # 104. Parker, Sophie^*,1, Schimel, Joshua¹, ¹ University of California, Santa Barbara, CA, USA Nitrogen losses from native perennial and exotic annual grasslands in California.

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Poster # 105. Smith, Elizabeth^*,1, Gonzalez-Meler, Miquel¹, Matamala, Roser ², Jastrow, Julie ², Miller, Richard², ¹ University of Illinois @ Chicago, Chicago, IL, USA² Argonne National Laboratory, Argonne, IL, USA Carbon dynamics of a restored tallgrass prairie chronosequence assessed with stable isotopes.

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Poster # 106. Harris, Wylie^*,1, Boutton, Thomas¹, Ansley, R.¹, ¹ Texas A&M University, College Station, Texas Soil carbon and nitrogen cycling in subhumid temperate grasslands: Effects of seasonal fire and simulated grazing.

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Poster # 108. Smith, Dixie¹, Fagan, Roxane^*,2, Johnson, Loretta², ¹ Pittsburg State University, Pittsburg, Kansas, USA² Kansas State University, Manhattan, Kansas, USA Changes in soil organic carbon cycling as juniper forests invade prairie: A ¹³C isotope approach.

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Poster # 109. Reiley, David^*,1, Breshears, Dave², Zedler, Paul ¹, Ebinger, Mike², Meyer, Clif², ¹ University of Wisconsin-Madison, Madison, WI, USA² Los Alamos National Laboratory, Los Alamos, NM, USA Soil carbon patterns in a semiarid pinyon-juniper woodland.

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Poster # 110. Hooker, Toby^*,1, Stark, John¹, Norton, Urszula¹, ¹ Department of Biology / Ecology Center, Logan, UT, USA Plant phenology effects on soil microbial C and N cycling in a semiarid ecosystem.

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Poster # 111. Cable, Jessica^*,1, Huxman, Travis¹, ¹ University of Arizona, Tucson, AZ Seasonal carbon flux dynamics in Sonoran Desert microbial crusts following precipiation pulses.

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Poster # 112. Domingues, Tomas^*,1, Flanagan, Lawrence², Martinelli, Luiz³, Ometto, Jean^{1, 3}, Ehleringer, James¹, ¹ University of Utah, Salt Lake City, Utah, USA² University of Lethbridge, Lethbridge, Alberta, Canada³ University of São Paulo, Piracicaba, São Paulo, Brazil Relationships between carbon assimilation and foliar nitrogen concentration in tropical rain forest functional groups.

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Poster # 113. Lewis, Gregory^*,1, Garrett, Holly¹, Andersen, Brannon¹, Sargent, Kenneth¹, ¹ Furman University, Greenville, SC, USA Concentrations and fluxes of dissolved nitrogen and sulfur in montane forested watersheds in South Carolina.

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Poster # 114. McCulley, Rebecca^*,1, Jobbagy, Esteban², Pockman, Will³, Jackson, Robert¹, ¹ Duke University, Durham, NC, USA² Universidad de Buenos Aires, Buenos Aires, Argentina, Argentina³ University of New Mexico, Albuquerque, NM Understanding patterns of root uptake using strontium isotopes, root and soil nutrient distributions, and modeling.

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Poster # 115. Novotny, Amy^*,1, Schade, John^{*,1, 2}, Kay, Adam², Hernandez, Daniel², Ogdahl, Megan², Hobbie, Sarah², ¹ Arizona State University, Tempe, Arizona² University of Minnesota, St. Paul, Minnesota Changes in plant elemental ratios in response to increased CO₂ and nitrogen enrichment.

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Poster # 116. Wolf, Julie^*,1, Murthy, Ramesh ², Barron-Gafford, Greg², ¹ Northern Arizona University, Flagstaff, AZ, USA² Columbia University's Biosphere 2 Center, Oracle, AZ, USA Elevated CO₂ increases sporocarp production and intraradicle sporulation of one AMF species at Biosphere 2.

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Poster # 117. Mitchell, Katherine¹, Monger, Curtis², Herrick, Jeffrey¹, Peters, Debra¹, ¹ Jornada Experimental Range USDA/ARS, Las Cruces, NM² New Mexico State University, Las Cruces, NM Simulation modelling of soil inorganic carbon in arid environments.

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Poster # 118. Loya, Wendy^*,1, Pregitzer, Kurt¹, Karberg, Noah ², King, John¹, Giardina, Christian ², ¹ Michigan Technological University, Houghton, MI² USDA Forest Service, Houghton, MI Tropospheric ozone reduces stable soil carbon formation under elevated carbon dioxide.

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Poster # 119. Taneva, Lina ¹, Matamala, Roser², Schlesinger, William ³, Gonzalez-Meler, Miquel¹, ¹ University of Illinois at Chicago, Chicago, IL² Argonne National Laboratory, Argonne, IL³ Duke University, Durham, NC Responses of autotrophic vs. heterotrophic soil respiration to elevated CO₂: Implications for soil C storage.

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Poster # 120. Barron, Stacy^*,1, Long, Noah ¹, Lichter, John¹, Schlesinger, William², ¹ Biology Department and Environmental Studies Program, Brunswick, ME, 04011² Nicholas School of the Environment, Durham, NC, 27708 Turnover rates of particulate organic matter and chemical fractions of forest soils under elevated atmospheric CO₂.

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Poster # 121. Springer, Clint^*,1, DeLucia, Evan², Thomas, Richard¹, ¹ West Virginia University, Morgantown, WV² University of Illinois at Urbana-Champaign, Urbana, IL Stimulation of GPP by CO₂ enrichment in the Duke Forest FACE Experiment estimated using PnET-Day.

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Poster # 122. Stover, Daniel^*,1, Day, Frank¹, Dilustro, John², Drake, Bert³, ¹ Old Dominion University, Norfolk, VA² Savannah River Ecological Laboratory, Aiken, SC³ Smithsonian Environmental Research Center, Edgewater, MD Effects of elevated CO₂ on root turnover and mortality in a Florida oak-scrub ecosystem.

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Poster # 123. Xu, Tao^*,1, Hui, Dafeng², Luo, Yiqi², White, Luther^*,1, ¹ Department of Mathematics,601 Elm Avenue ,University of Oklahoma, ,Norman, ,Oklahoma, ,USA² Department of Botany and Microbiology,University of Oklahoma,770 Van Vleet Oval, ,Norman, ,Oklahoma, ,USA Modeling net ecosystem exchange using auto-regression model with exogenous inputs.

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Poster # 124. Lunch, Claire^*,1, Bowling, David¹, ¹ Dept of Biology, Salt Lake City, Utah Difficulties of measuring eddy covariance fluxes of carbon dioxide at arid sites.

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Poster # 125. Powell, Thomas^*,1, Bracho, Rosvel², Hinkle, Ross³, Drake, Bert¹, ¹ Smithsonian Environmental Research Center, Edgewater, MD² National Research Council, Kennedy Space Center, FL³ Dynamac Corporation, Kennedy Space Center, FL Comparison of closed-path and open-path eddy covariance systems over a Florida scrub oak ecosystem.

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Poster # 126. Weatherly, Heather^*,1, Su, Bo², Wallace, Linda², Arnone, John¹, ¹ Desert Research Institute-Reno, Reno, NV, USA² University of Oklahoma, Stillwater, Oklahoma, USA NSF IRCEB interannual climate variability and ecosystem processes in tallgrass prairie: Controls on litter decomposition.

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Poster # 127. Markewitz, Daniel ^*,1, Figueiredo, Ricardo², Schuler, Azeneth³, Moraes, Jorge ³, Dunne, Thomas⁴, Davidson, Eric⁵, ¹ DB Warnell School of Forest Reources, Athens, GA² EMBRAPA Amazionia Oriental, Belem, Para, Brazil³ CENA, Piracicaba, Sao Paulo, Brazil⁴ Bern School of Environmental Science and Management, Santa Barbara, CA, USA⁵ The Woods Hole Research Center, Woods Hole, MA, USA Pathways of dissolved nutrient flux in a deforested Amazonian watershed.

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Poster # 128. McGuire, Mary Anne^*,1, Teskey, Robert¹, ¹ University of Georgia, Athens, Georgia, USA Release of CO₂ from xylem sap is responsible for apparent wound respiration in tree stems.

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Poster # 129. Lewis, J^*,1, Martin, Andrew¹, Turner, Greg¹, Richards, Jeannine¹, Griffin, Kevin², Tissue, David³, ¹ Calder Center, Fordham University, Armonk, NY² Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY³ Texas Tech University, Lubbock, TX Plant age and nitrogen supply interactively affect photosynthetic responses to flowering in Xanthium strumarium.

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Poster # 130. Stinson, Kristina^*,1, Bazzaz, F.¹, ¹ Harvard University, Cambridge, MA Elevated CO₂ reduces size asymmetry in competing stands of Ambrosia artemsiiafolia.

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Poster # 131. van Gestel, Natasja¹, Nesbit, April¹, Haley, Luke¹, Peffley, Ellen¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, Texas Effect of photoperiod on photosynthetic down-regulation and carbon gain in Allium fistulosum.

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Poster # 132. Tissue, David^*,1, Turnbull, Matthew², Griffin, Kevin³, Barbour, Margaret⁴, Hunt, John⁴, Schuster, William⁵, Brown, Kim⁶, Whitehead, David⁴, ¹ Texas Tech University, Lubbock, TX² University of Canterbury, Christchurch, New Zealand³ Columbia University, Palisades, NY⁴ Landcare Research, Lincoln, New Zealand⁵ Black Rock Forest Consortium, Cornwall, NY⁶ Ohio University, Athens, OH Scaling photosynthesis from shoots to the canopy in a rimu dominated rainforest in New Zealand.

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Poster # 133. Schilling, Erik^*,1, Lockaby, Graeme¹, ¹ School of Forestry and Wildlife Sciences, Auburn, Alabama, USA Productivity and biogeochemistry of two contrasting floodplain forests.

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Poster # 134. Bowling, Anna^*,1, Vanni, Michael¹, Renwick, William¹, Christian, Alan¹, ¹ Miami University, Oxford, OH, United States The effects of land use and precipitation on nutrient and sediment export from three Ohio watersheds.

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Poster # 135. Emanuel, Ryan¹, Albertson, John², Epstein, Howard^*,1, D'Odorico, Paolo¹, Williams, Christopher², ¹ University of Virginia, Charlottesville, VA² Duke University, Durham, NC Carbon dioxide exchange over an evolving successional landscape.

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Poster # 136. Hui, Dafeng^*,1, Xu, Tao¹, Luo, Yiqi¹, Wofsy, Steven ², ¹ University of Oklahoma, Norman, OK² Harvard University, Cambridge, MA Quantitative assessment of climatic effects on seasonal and interannual variabilities in net ecosystem exchange.

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Poster # 137. Whitbeck, Julie^*,1, ¹ University of New Orleans, New Orleans, LA, USA Setting bounds on belowground NPP: Evaluating three approaches in a bottomland hardwood forest.

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Poster # 138. Killilea, Mary^*,1, DeGloria, Stephen¹, Riha, Susan ¹, Philpot, William¹, ¹ Cornell University, Ithaca, NY, USA Carbon sequestration in New York State forestland.

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Poster # 139. Kulkarni, Madhura^*,1, ¹ University of Maryland Center for Environmental Science, Frostburg, MD, USA Contrasting controls on denitrification in a natural and an artificial wetland in the Appalachian mountains.

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Poster # 140. Starr, Gregory ¹, Martin, Timothy¹, Binford, Michael², Gholz, Henry^{1, 3}, Genc, Levent^*,2, ¹ School of Forest Resources and Conservation, Gainesville, FL, USA² Department of Geography, Gainesville, FL, USA³ National Science Foundation, Arlington, VA, USA Integration of carbon dynamics from leaf to landscape in Florida pine forest.

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Poster # 141. Norris, Mark¹, Reich, Peter ¹, Hobbie, Sarah², Wedin, David³, ¹ Department of Forest Resources, St. Paul, MN, USA² Department of Ecology, Evolution and Behavior, St. Paul, MN, USA³ School of Natural Resource Sciences, Lincoln, NE, USA Soil nutrient dynamics across a fire frequency gradient in oak savanna.

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Poster # 142. Aleric, Katherine^{*,1, 2}, Kirkman, L. Katherine¹, ¹ J.W. Jones Ecological Research Center, Newton, GA² University of Georgia, Athens, GA Growth responses of the federally endangered shrub, Lindera melissifolia (pondberry), to varied light environments.

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Poster # 143. Zhang, Chi^*,1, Tian, Hanqin¹, Pan, Shufen¹, Melillo, Jerry², Kicklighter, David², ¹ The University of Kansas, Lawrence, KS 66045² Marine Biological Laboratory, Woods Hole, MA 02543 Coupled cycles of carbon and phosphorus in tropical scosystems: A modeling study.

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Poster # 144. Wood, Tana^*,1, Lawrence, Deborah¹, ¹ University of Virginia, Charlottesville, VA Determinants of leaf litter nutrient cycling in a tropical rainforest: fertility versus topography.

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Poster # 145. Conner, Cristin^*,1, Wood, Tana¹, Lawrence, Deborah¹, ¹ University of Virginia, Charlottesville, VA Leaf litter addition effects upon soil nutrients in a wet tropical forest.

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Poster # 146. Hubbard, Jakara^*,1, Wood, Tana¹, Lawrence, Deborah ¹, ¹ University Of Virginia, Charlottesville, VA Litter addition effects on root biomass and nutrient concentrations in a wet tropical forest in Costa Rica: an experimental approach.

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Poster # 147. Marse, Todd^*,1, Whitbeck, Julie¹, ¹ University of New Orleans, New Orleans, LA, USA Assessment of aboveground litter decomposition rates across a hydrologic gradient in bottomland hardwood forest.

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Poster # 148. Hamilton, E William^*,1, Heckathorn, Scott², ¹ Washington and Lee University, Lexington, VA² Syracuse University, Syracuse, NY Stress reponses of Chenopodium album and Amaranthus retroflexus to heat stress grown in elevated CO₂ and temperature.

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