Poster # 70. Ritchie, Jerry^*,1, Schmugge, Thomas², Hsu, Ann¹, ¹ USDA ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, USA² Gerald Thomas Professor of Water Resources, Las Cruces, NM, USA, Using arid ecosystems to compare ASTER, MASTER, and ground reflectance measurements.

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Poster # 71. Macko, Stephen^*,1, Wang, Lixin¹, ¹ University of Virginia, Charlottesville, VA, Natural abundance ¹⁵N gradients across different ecosystems.

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Poster # 72. McCrackin, Michelle^*,1, Harms, Tamara¹, Grimm, Nancy¹, ¹ Arizona State University, Tempe, AZ, The sky is falling: soil microbial responses to deposition from the urban atmosphere.

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Poster # 73. Huerta-Martinez, Martin^*,1, Muñoz-Urias, Alejandro¹, García-Moya, Edmundo², ¹ Universidad de Guadalajara, Guadalajara, Jalisco, Mexico² Colegio de Posgraduados, Texcoco, Estado de Mexico, Mexico, Assessment of relative importance of climate and soil on plant associations in a semiarid area of central Mexico.

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Poster # 74. Gutiérrez, Julio^{*,1, 2, 3}, Squeo, Francisco^{1, 2, 3}, Aguilera, Lorgio¹, Valdivia, Luis¹, Meserve, Peter⁴, Kelt, Douglas⁴, ¹ Universidad de La Serena, La Serena, Chile² Centro de Estudios Avanzados en Zonas Áridas, La Serena, Chile³ Instituto de Ecología y Biodiversidad, Santiago, Chile⁴ Northern Illinois University, DeKalb, IL, The effects of shrubs on ephemeral plants: soil or canopy?

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Poster # 75. Gayvert, Stephanie^*,1, Walker, Lawrence¹, ¹ University of Nevada, Las Vegas, Las Vegas, NV, Effects of germination timing on competition between Brassica tournefortii and native Mojave Desert species.

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Poster # 76. Hall, Sharon ^*,1, Grimm, Nancy¹, Kaye, Jason^{2, 3}, Allen, Jonathan³, ¹ Arizona State University, Tempe, AZ, USA² The Pennsylvania State University, University Park, PA, USA³ Arizona State University, Tempe, AZ, USA, Ecosystem response to the urban atmosphere in the Sonoran Desert.

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Poster # 77. Tyler, Anna^*,1, Huxman, Travis¹, Pavao-Zuckerman, Mitchell¹, Venable, D. Lawrence¹, ¹ University of Arizona, Tucson, AZ, Annual and ephemeral plants are important for shrub-island development and ecosystem processes in arid regions.

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Poster # 78. Clark, Naomi^*,1, Nowak, Robert¹, ¹ University of Nevada, Reno, Reno, NV, Effects of elevated CO₂ on the root respiration rates of two Mojave Desert shrubs.

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Poster # 79. Holmgren, Milena^*,1, Lopez, Bernat², Gutierrez, Julio³, Squeo, Francisco³, ¹ University of Wageningen, Wageningen, The Netherlands² CREAF and Universidad Autonoma de Barcelona, Barcelona, Spain³ CEAZA and Universidad de La Serena, La Serena, Chile, ENSO events enhance tree establishment in arid and semi-arid South America.

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Poster # 80. Reichmann, Lara^*,1, Sala, Osvaldo¹, ¹ Brown University, Providence, RI, Meristem density constrains primary production variability along a precipitation gradient in the Patagonian steppe, Argentina.

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Poster # 81. Flombaum, Pedro^*,1, Sala, Osvaldo¹, ¹ Ecology and Evolutionary Department, Providence, RI, Biodiversity and invasion of species: the Patagonian steppe as a model ecosystem.

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Poster # 82. Mata-Gonzalez, Ricardo^*,1, McLendon, Terry¹, Martin, David², Trlica, M³, Pearce, Robert⁴, ¹ MWH Americas, Inc., Fort Collins, CO² Los Angeles Department of Water and Power, Bishop, CA³ Colorado State University, Fort Collins, CO⁴ Natural Resources Conservation Service (NRCS-USDA), Bishop, CA, Plant cover as related to groundwater depth in Owens Valley, CA.

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Poster # 83. Bell, Colin^*,1, Zak, John¹, Grizzle, Heath¹, Cox, Stephen², Tissue, David¹, Sirotnak, Joe³, ¹ Texas Tech University, Lubbock, TX² Texas Institute for Environmental and Human Health, Lubbock, TX³ Big Bend National Park, Big Bend, TX, Microbial carbon and nitrogen mineralization dynamics in desert grassland soils of Big Bend NP as influenced by global climate change.

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Poster # 84. Zimmermann, Craig^*,1, Resinger, Jen¹, Zak, John¹, Sirotnak, Joe², ¹ Department of Biological Sciences, Lubbock, TX, USA² Resource Management Division, Big Bend National Park, TX, USA, Seasonal patterns in microbial biomass and nitrogen dynamics in degraded grasslands of Big Bend National Park.

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Poster # 85. Throop, Heather^*,1, Archer, Steven¹, McMurtry, Chad¹, McClaran, Mitchel¹, ¹ University of Arizona, Tucson, AZ, Relationships between aboveground woody biomass and soil organic carbon in a semi-desert grassland.

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Poster # 86. Ziemann, Renee¹, Johnson, Jennifer^*,1, Collins, Scott¹, ¹ University of New Mexico, Albuquerque, NM, USA, The effect of grazing on composition and abundance of weedy species in desert grassland.

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Poster # 87. Keber, Robin^*,1, Banack, Sandra¹, ¹ California State University, Fullerton, Fullerton, CA, The influence of artichoke thistle on hummingbird populations.

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Poster # 88. Miles, Erin^*,1, Knops, Johannes¹, ¹ University of Nebraska, Lincoln, Lincoln, NE, USA, How does the identity of the dominant species affect the composition of grassland communities?

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Poster # 89. He, Jin-Sheng¹, Flynn, Dan^{*,1, 2}, Wang, Liang¹, Fang, Jingyun¹, Ma, Wenhong¹, Wang, Xiangping¹, ¹ Peking University, Beijing, China² Columbia University, New York, NY, C:N:P across Chinese grasslands: comparison with global patterns of leaf stoichiometry.

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Poster # 91. Bing, Christopher¹, Sollenberger, David², Egerton-Warburton, Louise^{*,2, 3}, ¹ University of California, Santa Barbara, CA² Chicago Botanic Garden, Glencoe, IL³ Northwestern University, Evanston, IL, Soil feedback mechanisms in prairie restoration.

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Poster # 92. Laungani, Ramesh^*,1, Knops, Johannes^*,1, ¹ University of Nebraska, Lincoln, Lincoln, NE, Plant competition: a shifting balance of limiting resources.

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Poster # 93. Klopf, Ryan^*,1, Campbell, Ryan^*,1, Baer, Sara¹, ¹ Southern Illinois University, Carbondale, IL, 62901, Above- and belowground production patterns and effects on soil nitrogen availability among species and source populations of dominant prairie grasses.

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Poster # 94. Zhou, Xuhui^*,1, Wan, Shiqiang², Luo, Yiqi¹, ¹ University of Oklahoma, Norman, OK, USA² The Chinese Academy of Sciences, Xiangshan, Beijing, China, Partitioning sources of soil CO₂ efflux and their interannual variability under experimental warming in a tallgrass prairie ecosystem.

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Poster # 95. Kitchen, Duane^*,1, Blair, John², ¹ Rockford College, Rockford, IL, USU² Kansas State University, Manhattan, KS, USA, Effects of annual fire and mowing on fine root dynamics in tallgrass prairie.

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Poster # 96. McLachlan, Megan^*,1, Fuhlendorf, Sam¹, ¹ Oklahoma State University, Stillwater, OK, Conservation Reserve Program (CRP) land as breeding bird habitat in the northern shortgrass prairie of North America.

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Poster # 97. Turner, Gregory^*,1, Demkó, Marianne², ¹ West Chester University of Pennsylvania, West Chester, PA² Virginia Western Community College, Roanoke, VA, Plant distributions along disturbance corridors at a Blue Ridge Mountain natural area.

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Poster # 98. Windish, Johanna^*,1, Puhr, Robert¹, Gove, Stephanie¹, McConnaughay, Kelly¹, Morris, Sherri¹, ¹ Bradley University, Peoria, IL, Consequences of bluff prairie restoration for soil and plant community dynamics.

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Poster # 99. Peters, Debra^*,1, Monger, H.², Herrick, Jeffrey¹, ¹ USDA ARS, Jornada Experimental Range, Las Cruces, NM, USA² New Mexico State University, Las Cruces, NM, USA, Changes in perennial grass recruitment from 1858 to present following woody plant invasion.

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Poster # 101. Calabrese, Laura^*,1, ¹ University of New Mexico, Albuquerque, NM, An ecological approach to the restoration of shrub-invaded Chihuahuan desert grassland in the southwestern US.

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Poster # 102. Browning, Dawn^*,1, Archer, Steve¹, ¹ University of Arizona, Tucson, AZ, Spatial patterns and trends in woody plant (Prosopis velutina) biomass accumulation with contrasting grazing practices (1932 to 1949).

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Poster # 103. Watrud, Lidia¹, Bollman, Mike², Storm, Marjorie ², King, George^*,2, ¹ US Environmental Protection Agency, Corvallis, OR² Dynamac Corporation, Corvallis, OR, Environmental and floristic factors affecting the establishment of transgenic Agrostis stolonifera in non-agricultural habitats in central Oregon.

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Poster # 105. Mazzola, Monica^*,1, Chambers, Jeanne, ¹ University of Nevada-Reno, Reno, NV, Effects of sucrose addition and seeding density on native species and cheatgrass establishment in sagebrush ecosystems.

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Poster # 106. Bono, Julieta^*,1, Brouver, Marcelo¹, Stamati, Mariana¹, Parmuchi, Gabriela¹, Manghi, Eduardo¹, Montenegro, Celina¹, ¹ Unidad de Manejo del Sistema de Evaluación Forestal, Argentina, Analysis of current structure and tree composition in the semiarid Chaco.

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Poster # 107. Ries, Lydia^*,1, Shugart, Herman¹, Kgope, Barney², ¹ University of Virginia, Charlottesville, VA² South Africa National Biodiversity Institute, Cape Town, Western Province, South Africa, Nutrients and soil moisture limitations in the Kalahari region of southern Africa.

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Poster # 108. Driskill, Scott^*,1, Benning, Tracy¹, Saah, David¹, ¹ University of San Francisco, San Francisco, California, Assessing the distribution of herbaceous biomass within Kruger National Park, South Africa.

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Poster # 109. Genova, Robert^*,1, Saah, David¹, Driskill, Scott¹, Benning, Tracy¹, ¹ University of San Francisco, San Francisco, CA, USA, Development of a user-friendly management tool to assess spatial and functional heterogeneity in a South African savanna ecosystem.

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Poster # 110. Saah, David^*,1, Genova, Robert¹, Driskill, Scott¹, Benning, Tracy¹, ¹ University of San Francisco, San Francisco, CA, USA, Do riparian habitat types significantly impact the function of African savannas: a test using ArcCentury.

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Poster # 111. Litvak, Marcy^*,1, Thijs, Ann², ¹ University of New Mexico, Albuquerque, NM² University of Texas, Austin, TX, The impact of woody encroachment on carbon dynamics in a C3/C4 grassland in Texas.

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Poster # 112. Monje, Oscar^*,1, Eraso, Ignacio¹, Drake, Bert², Hungate, Bruce³, Johnson, David², Sager, John ³, ¹ Space Life Sciences Lab, Kennedy Space Center, Fl² Smithsonian Environmental Research Center, Edgewater, MD³ Northern Arizona University, Flagstaff, AZ, Monitoring air quality of natural and CO₂-enriched Florida scrub-oak ecosystems.

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Poster # 113. Carmichael, Becky^*,1, Platt, William ¹, ¹ Louisiana State University, Baton Rouge, LA, The combined influence of small-scale disturbances on the groundcover in a restored longleaf pine savanna.

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Poster # 114. O'Brien, Joseph^*,1, Hiers, J. Kevin², Will, Rodney³, Mitchell, Robert⁴, ¹ USDA Forest Service, Athens, Ga² The Nature Conservancy, Thomasville, Ga³ Oklahoma State University, Stillwell, OK⁴ Joseph W. Jones Ecological Research Center, Newton, Ga, Litter versus shade: partitioning the effects of forest floor accumulation and midstory canopy development on understory density and species richness in Pinus palustris sand hill communities.

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Poster # 115. Clinton, Barton^*,1, Ford, Chelcy¹, Maier, Chris², ¹ USDA Forest Service Southern Research Station, Otto, NC² USDA Forest Service Southern Research Station, RTP, NC, Transient changes in transpiration, stem CO₂ efflux, and soil respiration in longleaf pine following leaf area reduction.

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Poster # 116. Falkey, Jennifer^{*,1, 2}, Mitchell, Robert ², Hendrick, Ronald¹, Markewitz, Daniel ¹, Pecot, Stephen ², ¹ University of Georgia, Athens, GA² Joseph W. Jones Ecological Research Center, Newton, GA, Disturbance frequency and changes in plant growth life-form: ecosystem effects on NPP.

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Poster # 117. Gayvert, Stephanie^*,1, Walker, Lawrence¹, ¹ University of Nevada, Las Vegas, Las Vegas, NV, Effects of germination timing on competition between Brassica tournefortii and native Mojave Desert species.

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