Poster # 139. Dress, William^*,1, Cade-Menun, Barbara², Walbridge, Mark³, ¹ Robert Morris University, Moon Twp, PA² Stanford University, Stanford, CA³ West Virginia University, Morgantown, WV, Resolving the relationship between phosphorus biogeochemistry and phosphorus retention in floodplain forest wetlands.

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Poster # 140. Thorsos, Eileen^*,1, Jackson, Robert¹, ¹ Duke University, Durham, NC, Nutrient cycling interactions of rhizodeposition and water flow along roots in a temperate forest.

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Poster # 141. Kgope, Barney^*,1, Midgley, Guy¹, Bond, William², Nagy, John³, Woodward, Ian⁴, ¹ South African National Biodiversity Institute, Claremont, South Africa² University of Cape Town, Rondebosch, South Africa³ Brookhaven National Laboratory, Upton, NY⁴ University of Sheffield, Sheffield, United Kingdom, Atmospheric CO₂ controls carbon allocation and ecological success in African savanna trees.

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Poster # 142. Iversen, Colleen^*,1, Norby, Richard², Classen, Aimée², ¹ University of Tennessee, Knoxville, TN² Oak Ridge National Laboratory, Oak Ridge, Tennessee, The effects of CO₂-enrichment on fine root characteristics: implications for root decomposition rates.

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Poster # 143. Liu, Feng^*,1, Wu, Ben¹, Bai, E¹, Boutton, Thomas¹, Archer, Steven², ¹ Texas A&M University, College Station, TX² University of Arizona, Tucson, AZ, Spatial variability of soil organic carbon in a subtropical savanna landscape and its implications on sampling design.

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Poster # 144. Diochon, Amanda^*,1, Kellman, Lisa¹, Beltrami, Hugo¹, ¹ Environmental Sciences Research Centre, Antigonish, NS, The response of microbial respiration in a coniferous forest soil to changes in temperature.

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Poster # 145. Cipollini, Martin^*,1, Huber, Amy², Gaskell, Amy³, Belk, Melanie¹, Donahue, Carly¹, ¹ Berry College, Mount Berry, GA² Miami University, Ohio, Miami, OH³ Georgia Southern, Statesboro, GA, Estimation of carbon storage and dynamics in a mountain longleaf pine ecosystem undergoing restoration.

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Poster # 146. Strong, Aaron ^*,1, Barron, Alexander², Wright, S. Joseph³, Harms, Kyle⁴, Yavitt, Joseph⁵, Hedin, Lars², ¹ Swarthmore College, Swarthmore, PA² Princeton University, Princeton, NJ³ Smithsonian Tropical Research Institute, Panama City, Panama⁴ Louisiana State University, Baton Rouge, LA⁵ Cornell University, Ithaca, NY, Litter chemistry controls on heterotrophic nitrogen fixation in a lowland tropical forest, Panama.

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Poster # 147. Bravo, Dianne^*,1, Hill, Alan ¹, ¹ York University, Toronto, ON, Canada, The effects of high groundwater nitrate inputs on riparian conifer forest growth and associated plant-soil interactions.

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Poster # 148. van Diepen, Linda^*,1, Lilleskov, Erik², Pregitzer, Kurt¹, ¹ Michigan Technological University, Houghton, MI² North Central Research Station, USDA Forest Service, Houghton, MI, Decline of arbuscular mycorrhizal fungi in a northern hardwood forest exposed to long-term increased nitrogen inputs.

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Poster # 149. Faulkner, Alison^*,1, Holland, Marjorie¹, Moore, Matthew ², Cooper, Charles², ¹ University of Mississippi Department of Biology, University, MS, USA² USDA-ARS National Sedimentation Laboratory, Oxford, MS, USA, Nitrogen use efficiency of C₃ and C₄ wetland Cyperus species in a long-term greenhouse experiment.

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Poster # 150. Rueth, Heather^*,1, ¹ Grand Valley State University, Alledale, MI, Comparison of nutrient pools between a northern hardwood forest and red pine plantation in northern-lower Michigan.

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Poster # 151. Day, Thomas¹, Ruhland, Christopher², Bryant, David ¹, Strauss, Sarah¹, Krna, Matthew ², ¹ Arizona State University, Tempe, AZ² Minnesota State University, Mankato, MN, Effects of warming and supplemental precipitation on CO₂ flux, nutrient cycling, and primary production in Antarctic tundra.

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Poster # 152. Kirkpatrick, H^*,1, Spear, Erin¹, Donnelly, Erin¹, ¹ University of Puget Sound, Tacoma, WA, Soil nitrate reduction using biomass removal and sucrose addition in western Washington prairie soils.

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Poster # 153. Rothstein, David^*,1, ¹ Michigan State University, East Lansing, MI, Patterns of amino acid availability across a temperate forest fertility gradient.

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Poster # 154. Kerkhoff, Andrew^{*,1, 2}, Enquist, Brian², Crumbacher, Laura², Gaube, Peter², Wilson, Melissa ², ¹ Kenyon College, Gambier, OH² University of Arizona, Tucson, AZ, Metabolic allometries and N:P stoichiometry of montane plant communities.

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Poster # 155. Chen, Guangsheng^*,1, Tian, Hanqin¹, Liu, Mingliang¹, Chen, Hua¹, Zhang, Chi¹, Ren, Wei¹, Pan, Shufen¹, ¹ Auburn University, Auburn, AL, Canopy uptakes of atmospheric nitrogen and its implications for net primary production and carbon sequestration in southeastern US.

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Poster # 156. Odenbach, Kylea^*,1, Stursova, Martina ¹, Porras-Alfaro, Andrea¹, Sinsabaugh, Robert¹, ¹ University of New Mexico, Albuquerque, NM, The effects of nitrogen deposition on fungal community structure.

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