8:00 AM Templer, Pamela^*,1, Pett-Ridge, Jennifer¹, Silver, Whendee¹, Firestone, Mary¹, ¹ University of California, Berkeley, CA, USA Controls on nitrogen retention and loss in tropical forest soils: Part 1. Patterns of nitrogen cycling.

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8:20 AM Pett-Ridge, Jennifer^*,1, Templar, Pamela ¹, Silver, Whendee¹, Firestone, Mary¹, ¹ U.C. Berkeley --Ecosystem Sciences, Berkeley, CA, USA Controls on nitrogen rentention and loss in tropical forest soils: Part II. Linking microbial community structure to nitrogen cycling.

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8:40 AM Newman, Greg^{1, 2}, Arthur, Mary ¹, Muller, Bob^{1, 3}, ¹ Department of Forestry, Lexington, KY² School of Forestry, Flagstaff, AZ³ Santa Barbara Botanic Garden, Santa Barbara, CA Species composition strongly influences soil fertility in a mixed mesophytic forest.

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9:00 AM Lawrence, Deborah^*,1, Chazdon, Robin², Redondo, Alvaro³, ¹ University of Virginia, Charlottesville, VA² University of Connecticut, Storrs, CT³ Yale University, New Haven, CT Tree species effects on productivity and nutrient cycling in tropical rainforest.

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9:20 AM Knorr, Melissa^*,1, Frey, Serita¹, Curtis, Peter², ¹ University of New Hampshire, Durham, NH, USA² Ohio State University, Columbus, OH, USA A meta-analysis of nitrogen enrichment affects on litter decomposition.

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9:40 AM Break.

9:50 AM Hubbard, Robert¹, Ryan, Michael^{1, 2}, Elder, Kelly^{1, 2}, Rhoades, Charles¹, ¹ USDA Forest Service, Fort Collins, Colorado² Colorado State University, Fort Collins, Colorado Seasonal patterns in soil surface CO₂ flux under snow cover in 50 and 300 year old subalpine forests.

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10:10 AM Hicks, William^*,1, Chen, Hua², ¹ Department of Biology, Bethany, WV, USA² Department of Forest Science, Corvallis, OR, USA High asymbiotic nitrogen fixation rates in decomposing roots.

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10:30 AM Hernandez, Daniel^*,1, Hobbie, Sarah^*,1, ¹ University of Minnesota, St. Paul, Minnesota, USA Effects of litter nutrients and soil nutrient availability on decomposition along an experimental fire frequency experiment in oak savanna.

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10:50 AM Dilustro, John^*,1, Collins, Beverly¹, Duncan, Lisa¹, Crawford, Chris¹, ¹ Savannah River Ecology Laboratory, Aiken, SC, 29802 Soil respiration, microbial biomass and fine root production in forests of varying soil texture.

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11:10 AM Cheng, Weixin^*,1, Fu, Shenglei¹, Susfalk, Richard², Mitchell, Robert³, ¹ University of California-Santa Cruz, Sanrta Cruz, California² Desert Research Institute, Reno, Nevada³ Jones Ecological Research Center, Newton, Georgia Assessing tree rhizosphere carbon dioxide efflux using a natural ¹³C tracer method.

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