Poster # 112. Stinson, Kristina^*,1, Brophy, Caroline², Connolly, John², ¹ Harvard University, Petersham, MA, USA² UCD, School of Mathematical Sciences, Dublin 4, Ireland, Functional relationship models for the biomass and reproductive allocation of ragweed genotypes at ambient and elevated CO₂.

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Poster # 113. Nord, Eric^*,1, Lynch, Jonathan¹, ¹ The Pennsylvania State University, University Park, PA, Is delayed flowering an adaptive response to low phosphorus availability?

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Poster # 114. Brodersen, Craig^*,1, Vogelmann, Thomas¹, Williams, William², Gorton, Holly², Poirier, Nathan¹, ¹ University of Vermont, Burlington, VT, USA² St. Mary's College of Maryland, Saint Marys City, MD, USA, Photosynthesis of Zea mays and Helianthus annuus under diffuse and collimated light.

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Poster # 115. Myers, Jonathan^{*,1, 2}, Kitajima, Kaoru², ¹ Department of Biological Sciences, Baton Rouge, LA, USA² Department of Botany, Gainesville, FL, USA, Seedling acclimation to dynamic forest light environments: temporal trends in carbon storage, growth, and photosynthesis.

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Poster # 116. Ebbets, Allison^*,1, Barker, David¹, Ebbert, Volker², Rosenstiel, Todd², Adams, William², Tissue, David³, Smith, Stan¹, ¹ University of Nevada, Las Vegas, Las Vegas, NV² University of Colorado, Boulder, CO³ Texas Tech University, Lubbock, TX, Potential changes in photosynthetic performance of two Mojave Deserts shrubs in response to elevated CO₂.

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Poster # 117. Tissue, David^*,1, Griffin, Kevin², Turnbull, Matthew³, Whitehead, David⁴, ¹ Texas Tech University, Lubbock, TX² Columbia University, Palisades, NY³ University of Canterbury, Christchurch, New Zealand⁴ Landcare Research, Lincoln, New Zealand, Impact of leaf and tree age on stomatal and transfer conductance limitations to photosynthesis in mountain beech in New Zealand.

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Poster # 118. Hill, Judson^*,1, Germino, Matthew ¹, ¹ Idaho State University, Pocatello, ID, Relative contribution of adjustments in leaf orientation and physiology to whole-plant photosynthesis of Lactuca serriola (compass plant) in sun and shade microsites.

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Poster # 119. Buyarski, Christopher^*,1, Thomas, Richard¹, ¹ West Virginia University, Morgantown, Morgantown, WV, Interactive effects of CO₂ and nitrogen on photosynthesis of Liquidamber styraciflura trees in the Duke Forest Free Air CO₂ Enrichment experiment.

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Poster # 120. Davey, Matthew¹, Bonnage, Steve², Newman, Roy^*,2, Woodward, Ian¹, Quick, Paul¹, ¹ UNIVERSITY OF SHEFFIELD UK, Sheffield, Yorkshire, United Kingdom² ADC BIOSCIENTIFIC LTD, Hoddesdon, Herts, United Kingdom, Intra- and inter-specific differences of gas-exchange in cold-shocked Arabidopsis thaliana and Arabidopsis lyrata petraea.

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Poster # 121. Beauregard, Frieda^*,1, Côté, Benoît¹, ¹ McGill University, Montreal, QC, Canada, Short and long term changes in active root depth and Ca uptake of sugar maple and its relationships with climatic extremes in southern QC, Canada.

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Poster # 122. Chapman, Jack^*,1, Kaeser, Melanie¹, Holzapfel, Claus¹, ¹ Rutgers University, Newark, NJ, Plant-hawks and -doves: root cooperation and competition among clone mates in strawberries.

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Poster # 123. Coleman, Mark^*,1, ¹ USDA Forest Service, Savannah River, New Ellenton, SC, USA, Root biomass expansion in establishing forest stands; comparison among species and resource availability.

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Poster # 124. Falik, Omer ¹, Grader , Abraham ¹, Eissenstat, David ¹, ¹ The Pennsylvania State University, University Park, PA, Visualization of plants root nondestructively in situ using x-ray computed tomography technology.

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Poster # 125. Genitempo, Drew^*,1, White, Joseph¹, ¹ Baylor University, Waco, TX, Small scale sensitivity of tree transpiration to soil texture.

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Poster # 126. Sobrado, M¹, Ewe, Sharon ^{2, 3}, ¹ Laboratorio de Biologia Ambiental de Plantas, Departamento de Biologia de Organismos, Universidad Simon Bolivar, Caracas, Distrito Capital 1080A, Venezuela² Southeast Environmental Research Center, Florida International University, Miami, FL, USA³ Smithsonian Marine Station, 701 Seaway Drive, Fort Pierce, FL, USA, Ecophysiological characteristics of Avicennia germinans and Laguncularia racemosa coexisting in a scrub mangrove forest.

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Poster # 127. Jiménez-Castillo, Mylthon^*,1, Lusk, Christopher^{2, 3}, Salazar, Nicolas², ¹ Núcleo FORECOS, Universidad Austral de Chile, Valdivia, Chile² Departamento de Botánica, Universidad de Concepcion, Concepcion, Chile³ Department of Biological Sciences, Macquarie University, Sydney, Australia, Relationships of sapwood area with hydraulic conductivity and leaf area in branchlets of temperate evergreen conifers and angiosperms.

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Poster # 128. Maier, Chris^*,1, Clinton, Barton², Johnsen, Kurt¹, ¹ USDA Forest Service, Research Triangle Park, North Carolina² USDA Forest Service, Otto, North Carolina, Substrate supply controls stem CO₂ efflux in young loblolly pine trees.

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Poster # 129. Blecker, Steve^*,1, Kavanagh, Katy¹, Marshall, John ¹, Pangle, Robert¹, Schotzko, Alisa, ¹ University of Idaho, Moscow, ID, Growing season and canopy height variations in soil water use in a northern Idaho coniferous forest.

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Poster # 130. Bleby, Timothy^{*,1, 2}, Burgess, Stephen^{2, 3}, ¹ Duke University, Durham, NC² The University of Western Australia, Perth, WA, Australia³ Cooperative Research Centre for Plant-Based Management of Dryland Salinity, Perth, WA, Australia, Stem-mediated hydraulic redistribution of soil water in semi-arid Eucalyptus trees.

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Poster # 131. Patrick, Lisa^*,1, Tissue, David¹, ¹ Texas Tech University, Lubbock, TX, How does increased summer precipitation affect daily CO₂ and H₂O fluxes of North American desert plants?

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Poster # 132. Howard, Ava^*,1, Donovan, Lisa¹, ¹ University of Georgia, Athens, GA, Regulation of nighttime water loss in Populus in response to soil nitrogen and water manipulation.

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Poster # 133. Christensen, Lindsey ^*,1, Tague, Christina ², Baron, Jill ^{1, 3}, ¹ Natural Resource Ecology Laboratory, Fort Collins, CO, U.S.A.² Department of Geography, San Diego, CA, U.S.A.³ US Geological Survey, Fort Collins, CO, U.S.A., Spatiotemporal response of transpiration to climate variation in a snow dominated mountain ecosystem.

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Poster # 134. Vollmar, Ashley^*,1, Gunderson, Carla², Wreshnig, Daniel³, O'Hara, Keiran⁴, King, Anthony², ¹ University of Tennessee, Knoxville, TN² Oak Ridge National Laboratory, Oak Ridge, TN³ Albion College, Albion, MI⁴ Florida State University, Tallahassee, FL, Impacts of respiratory acclimation on forest responses to atmospheric warming.

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Poster # 135. LaMalfa, Eric^*,1, Ryel, Ron¹, ¹ Utah State University, Logan, UT, USA, Differences in water transfer mechanisms between aspen and conifer communities in a northern Rocky Mountain watershed.

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Poster # 136. Wullschleger, Stan¹, Childs, Kenneth¹, Hanson, Paul¹, ¹ Oak Ridge National Laboratory, Oak Ridge, TN, A physical model of conductive and convective heat transfer from thermal dissipation probes.

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Poster # 137. Sides, Mary^*,1, White, Joseph¹, ¹ Baylor University, Waco, TX, Modeling relative leaf water content in central Texas forests for fire hazard prediction.

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Poster # 138. Sparks, Kimberlee^*,1, Blackwolf, Charlene², Conklin, Patricia², Sparks, Jed¹, ¹ Cornell Isotope Laboratory, Ithaca, NY² State University of New York, Cortland, Cortland, NY, The influence of leaf ascorbate on plant water-use efficiency: isotopic composition of Arabidopsis thaliana mutants defective in ascorbate recycling.

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Poster # 139. Sullivan, Maura^*,1, Peters, Stephen¹, ¹ Lehigh University, Bethlehem, PA, Ecohydrology of a calcareous fen in northeastern Pennsylvania: a comparison of temporal patterns of water-table depth in shrub and herb dominated areas.

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Poster # 140. Bichler, Justin^*,1, Pockman, William², Jackson, Robert³, McElrone, Andrew ¹, ¹ Saint Joseph's University, Philadelphia, PA² University of New Mexico, Albuquequere, NM³ Duke University, Durham, NC, Quantifying the contribution of aquaporins to overall water transport in deep roots accessed via caves.

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Poster # 141. Gonzáles, Wilfredo¹, Suárez, Lorena¹, Molina-Montenegro, Marco¹, Gianoli, Ernesto¹, ¹ Universidad de Concepción, Concepción, VIII región, Chile, Water availability limits tolerance to apical damage in the annual tarweed Madia sativa.

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Poster # 142. Reynolds, Robert^*,1, Wang, Ying¹, Bowden, Joseph¹, Bauerle, William¹, ¹ Clemson University, Clemson, SC, Predicting carbon-based red maple tree growth in response to water stress: assessment of soil water content constraints.

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Poster # 143. Meinzer, Frederick^*,1, Warren, Jeffrey¹, Brooks, J.², ¹ USDA Forest Service, Corvallis, OR² U.S. Environmental Protection Agency, Corvallis, OR, Partitioning of soil water resources in an old-growth Douglas-fir/western hemlock forest.

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Poster # 144. Benscoter, Brian^*,1, Vitt, Dale¹, ¹ Department of Plant Biology, Carbondale, IL, USA, Reevaluating feathermoss growth and production: a challenge to classic methods and implications for boreal carbon cycling.

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Poster # 145. Weaver, Jennifer^*,1, Jurena, Paul¹, ¹ University of Texas at San Antonio, San Antonio, TX, Growth response of Juniperus ashei and Carex planostachys to artificial fissures.

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Poster # 146. Pimienta-Barrios, Eulogio^*,1, Ramirez-Hernandez, Blanca¹, ¹ Universidad de Guadalajara, Guadalajara, Jalisco, Mexico, Phenology, growth, and response to light of Spondias purpurea.

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Poster # 147. Ryel, Ronald¹, Flint, Stephan¹, Barnes, Paul^*,2, ¹ Utah State University, Logan, UT² Loyola University, New Orleans, LA, Diurnal changes in epidermal UV transmittance of plants in naturally high UV environments.

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Poster # 148. Majure, Lucas^*,1, Ervin, Gary ¹, ¹ Mississippi State University, Mississippi State, MS, The morphological plasticity of Opuntia pusilla (Haw.) Nutt. induced by differentiations in environmental variables.

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Poster # 149. Stiles, Elizabeth¹, Cech, Nadja², Lacey, Elizabeth^*,1, ¹ University of North Carolina - Greensboro, Greensboro, NC² University of North Carolina - Greensboro, Greensboro, NC, Temperature-sensitive changes in floral color and anthocyanin production in Plantago lanceolata: mechanisms of thermoregulation.

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