Poster # 133. Beman, J Michael^*,1, Seto, Karen², Matson, Pamela^1,2, ¹ Department of Geological and Environmental Sciences, Stanford² Center for Environmental Science and Policy, Stanford Trace gas emissions from extensive aquaculture systems in the Red River Delta, Vietnam.

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Poster # 134. Bian, Aihua^*,1, Luo, Yiqi¹, Hui, Dafeng¹, Schimel, David², ¹ University of Oklahoma, Norman, OK² National Center for Atmospheric Research, Boulder, CO Net ecosystem productivity and atmospheric nitrogen deposition.

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Poster # 135. Pimienta-Barrios, Eulogio^*,1, González del Castillo-Aranda, María Eugenia¹, Nobel, Park², Ramírez-Hernández, Blanca¹, ¹ Universidad de Guadalajara., Guadalajara, Jalisco, México² University of California-Los Angeles., Los Angeles, California Ecophysiology of a wild platyopuntia exposed to prolonged drought.

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Poster # 136. CHOINSKI, JOHN^*,1, EAMUS, DEREK², RALPH, PETER², ¹ UNIVERSITY OF CENTRAL ARKANSAS, CONWAY, AR² UNIVERSITY OF TECHNOLOGY, SYDNEY, NSW, AUSTRALIA Changes in photosynthesis during leaf expansion in Eucalyptus sieberi.

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Poster # 137. HILEMAN, DOUGLAS^*,1, WESLEY, JAMES¹, MORTLEY, DESMOND¹, ¹ TUSKEGEE UNIVERSITY, TUSKEGEE, AL Canopy photosynthesis of potential food crops for space missions.

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Poster # 138. Johnson, Jeremy^*,1, Wehner, Brent¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, TX Carbohydrate feedback inhibition of photosynthesis in Allium onions with continuous light and elevated atmospheric CO₂.

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Poster # 139. Francis, Janelle^*,1, Curtis, Peter², Ellsworth, David¹, ¹ School of Natural Resources and Environment, Ann Arbor, MI² Dept. of Evolution, Ecology, and Organismal Biology, Columbus, OH Vertical gradients in canopy CO₂-exchange and leaf N in Quercus and Populus at a flux site.

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Poster # 140. Funk, Jennifer^*,1, Mak, John², Lerdau, Manuel¹, ¹ Department of Ecology and Evolution, Stony Brook, NY² Marine Sciences Research Center, Stony Brook, NY The role of stored carbon in isoprene production in response to environmental stress in Populus deltoides.

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Poster # 141. McGuire, Mary Anne^*,1, Teskey, Robert¹, ¹ University of Georgia, Athens, Georgia Microelectrode technique for measuring xylem sap CO₂ concentration in tree stems.

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Poster # 142. Fortini, Lucas^*,1, Mulkey, Stephen¹, Zarin, Daniel¹, Vasconcelos, Steel², Carvalho, Claudio³, ¹ University of Florida, Gainesville, FL² Faculdade de Ciências Agrárias do Pará, Belém, PA, Brazil³ Embrapa Amazonia Oriental, Belém, PA, Brazil Drought constraints on leaf gas exchange by Miconia ciliata (Melastomataceae) in the understory of an eastern Amazonian regrowth forest.

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Poster # 143. SU, BO^*,1, HUI, DAFENG¹, VERBURG, PAUL², OBRIST, DANIEL², ARNONE, JOHN², JOHNSON, DALE³, EVANS, R.⁴, LUO, YIQI¹, ¹ Department of Botany and Microbiology, Norman, OK² Desert Research Institute, Reno, NV³ Department of Environmental and Resource Sciences, Reno, NV⁴ University of Arkansas Stable Isotope Laboratory, Fayetteville, AR Canopy radiation- and water-use efficiencies of cheatgrass as affected by pulse and gradual N fertilization.

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Poster # 144. Morse, Laura^*,1, Day, Thomas¹, Faeth, Stanley¹, ¹ Arizona State University, Tempe, Arizona Neotyphodium infection on growth and gas exchange of Arizona fescue under contrasting water availability.

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Poster # 145. Leffler, A. Joshua^*,1, Caldwell, Martyn¹, ¹ Utah State University, Logan, Utah Physiological changes in Utah juniper (Juniperus osteosperma) and big sagebrush (Artemisia tridentata) along a sage/juniper transition zone.

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Poster # 146. Sharifi, Rasoul^*,1, Brostoff, William², Rundel, Philip¹, ¹ University of California, Los Angeles., Los Angeles, CA² Engineer Research and Development Center, Waterways Experiment Station., Vicksburg, MS Photosynthesis of biotic crusts in pans and dunes in the western Mojave Desert: Field studies.

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Poster # 147. TINOCO_OJANGUREN, CLARA^*,1, ¹ Universidad Nacional Autónoma de México, Hermosillo, Sonora, México Diurnal and seasonal patterns of gas exchange, and carbon gain contribution of leaves and stems of Justicia californica in the Sonoran Desert.

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Poster # 148. Naumburg, Elke^*,1, ¹ University of Nevada, Las Vegas & Desert Research Institute, Las Vegas, NV Annual variation in the carboxylation efficiency of Larrea tridentata .

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