8:00 AM Leis, Sherry^*,1, Engle, David¹, Leslie, David², Fehmi, Jeffrey³, ¹ Oklahoma State University, Stillwater, OK, USA² Oklahoma Cooperative Fish and Wildlife Research Unit, Stillwater, OK³ U.S. Army Engineer Research and Development Center -Construction Engineering Research Laboratory, Champaign, IL, USA Mixed-grass prairie response to a gradient of anthropogenic soil disturbance.

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8:20 AM Zabinski, Cathy^*,1, Walling, Sara^{1, 2}, ¹ Montana State University, Bozeman² National Soil Erosion Research Laboratory, West Lafeyette, IN Ecological stoichiometry of arbuscular mycorrhizae in grassland plants with simulated herbivory.

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8:40 AM Wan, Shiqiang¹, Norby, Richard ¹, Weltzin, Jake², Reilly, Carolyn¹, Allen, Philip², ¹ Environmental Sciences Division, Oak Ridge, TN, USA² Department of Ecology and Evolutionary Biology, Knoxville, TN, USA Global change and soil respiration: Complex responses to multiple interacting factors in old-field grassland.

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9:00 AM Parker, Sophie^*,1, Schimel, Joshua¹, ¹ University of California- Santa Barbara, Santa Barbara, CA Nitrogen cycling in California grassland soils is influenced by soil texture and plant phenology.

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9:20 AM Mentzer, Jessica^*,1, Shaw, Rebecca², Balser, Teri^{1, 3}, ¹ Soil Science Department, Madison, WI, 53706² The Nature Conservancy, San Fransisco, CA, USA³ Gaylord Nelson Institute for Environmental Studies, Madison, WI Impacts of multiple global change drivers on the composition of a grassland soil microbial community.

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9:40 AM break.

9:50 AM Hufford, Kristina^*,1, Mazer, Susan ¹, Schimel, Joshua¹, ¹ Dept. of Ecology, Evolution, and Marine Biology, Santa Barbara, CA, USA Do soil factors predict the distributions of three California bunchgrasses among Channel Island and Mainland populations?

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10:10 AM Harris, Wylie^*,1, Boutton, Thomas¹, Ansley, R², ¹ Texas A&M University, College Station, Texas, USA² Texas Agricultural Experiment Station, Vernon, Texas, USA Plant community and soil microbial dynamics in subhumid temperate grasslands: Effects of seasonal fire and clipping.

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10:30 AM Huber-Sannwald, Elisabeth ¹, Arredondo, Tulio¹, ¹ Instituto Potosino de Investigacion Cientifica y Tecnologica, San Luis Potosi, S.L.P., Mexcio Land use change in desert grassland in Central Mexico: A belowground perspective.

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10:50 AM Bestelmeyer, Brandon¹, Ward, Judy ¹, Herrick, Jeffrey¹, Tugel, Arlene², ¹ USDA-ARS Jornada Experimental Range, Las Cruces, NM, USA² USDA-NRCS Jornada Experimental Range, Las Cruces, NM, USA Soil-geomorphic basis of divergent landscape trajectories in the Chihuahuan Desert.

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