1:30 PM Weintraub, Michael^*,1, Schimel, Joshua¹, ¹ University of California, Santa Barbara, Santa Barbara, CA Plant uptake of amino acids in the Arctic tundra of Alaska.

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1:45 PM Epstein, Howard^*,1, Yeatman, William¹, ¹ University of Virginia, Charlottesville, VA, USA Nitrogen resorption from senescing plant tissue in arctic tundra and its effects on ecosystem properites.

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2:00 PM Kling, George^*,1, Judd, Kristi¹, Sommerkorn, Martin², Nadelhoffer, Knute², Rastetter, Edward², Johnson, Loretta³, ¹ University of Michigan, Ann Arbor, MI² Marine Biological Laboratory, Woods Hole, MA³ Kansas State University, Manhattan, KS Transfers of carbon across the landscape: The controls on dissolved C production in soils.

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2:15 PM Brodersen, Craig^*,1, Germino, Matthew², Smith, William¹, ¹ Wake Forest University, Winston-Salem, NC² Idaho State University, Pocatello, ID Carbon uptake limitations in Abies lasiocarpa and Picea engelmannii across an alpine treeline ecotone.

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2:30 PM Johnson, Daniel^*,1, Germino, Matthew ^*,2, Smith, William^*,1, ¹ Wake Forest University, Winston-Salem, NC, USA² Idaho State University, Pocatello, ID, USA Carbon gain in young seedlings of Abies lasiocarpa and Picea engelmannii at alpine treeline.

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2:45 PM Break.

3:00 PM Sommerkorn, Martin^*,1, Nadelhoffer, Knute¹, Johnson, Loretta², Kling, George³, Rastetter, Edward¹, ¹ The Macaulay Institute, Aberdeen, UK² Kansas State University, Manhattan, KS, USA³ University of Michigan, Ann Arbor, MI, USA Carbon and nitrogen allocation of tundra plants assessed through an ecosystem scale dual tracer experiment.

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3:15 PM Pardo, Linda^*,1, McNulty, Steven², Boggs, Johnny², ¹ USDA Forest Service, Burlington, VT² USDA Forest Servce, Raleigh, NC Effects of N deposition on high elevation forests in the northeastern US: foliar ¹⁵N patterns.

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3:30 PM Nydick, Koren^*,1, Arp, Chris², Baker, Michelle², Hall, Bob³, Wurtsbaugh, Wayne¹, ¹ Aquatic, Watershed, and Earth Resources Dept., Logan, UT, USA² Biology Dept., Logan, UT, USA³ Biology Dept., Laramie, WY, USA Comparative retention of nitrogen in stream-lake linkages during snowmelt.

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3:45 PM Withington, Cynthia^*,1, Sanford, Robert¹, ¹ University of Denver, Denver, CO, USA Nutrient uptake and decomposition in the forest-alpine tundra ecotone of the Colorado Front Range.

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4:00 PM Barrett, J^*,1, Virginia, Ross¹, Wall, Diana², Lyons, William³, ¹ Dartmouth College, Hanover, NH, USA² Natural Resource Ecology Laboratory, Fort Collins, CO, USA³ The Ohio State University, Columbus, OH, USA Stoichiometric evolution of Antarctic Dry Valley landscapes.

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4:15 PM Judd, Kristin^*,1, Crump, Byron², Zak, Don¹, Sinsabaugh, Robert³, Kling, George¹, ¹ University of Michigan, Ann Arbor, MI² Ecosystem Center, Marine Biological Lab, Woods Hole, MA³ University of New Mexico, Albuquerque, NM Dissolved organic carbon in soils, streams, and lakes of an arctic catchment: linking bioavailability, chemistry, and microbial community comoposition.

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