8:00 AM Craine, Joseph^*,1, Sugita, Shinya¹, ¹ University of MInnesota, Saint Paul, MN, United States Reconstruction of terrestrial N cycling with natural abundance ¹⁵N in tree rings.

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8:20 AM Pardo, Linda^*,1, Templer, Pamela², Goodale, Christine³, Groffman, Peter⁴, Duke, Sara⁵, ¹ USDA Forest Service, Burlington, VT² University of California, Berkeley, CA³ Cornell University, Ithaca, NY⁴ Institute of Ecosystems Studies, Millbrook, NY⁵ USDA Agricultural Research Service, College Station, TX Regional assessment of N saturation using foliar ¹⁵N.

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8:40 AM Hungate, Bruce^*,1, Johnson, Dale², Megonigal, J. ³, Drake, Bert³, Hinkle, C⁴, ¹ Dept. of Biological Sciences and Merriam-Powell Center for Environmental Research, Flagstaff, AZ, USA² Department of Biology, Reno, NV, USA³ Smithsonian Environmental Research Center, Edgewater, MD, 21038⁴ Dynamac Corporation, Kennedy Space Center, FL, USA Nitrogen cycling in a scrub-oak woodland during eight years of carbon dioxide enrichment.

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9:00 AM Lovett, Gary^*,1, Fitzhugh, Ross², Christenson, Lynn^{1, 3}, Weathers, Kathleen¹, Arthur, Mary⁴, Templer, Pamela⁵, ¹ Institute of Ecosystem Studies, Millbrook, NY² University of Illinois, Urbana, IL³ SUNY College of Environmental Science and Forestry, Syracuse, NY⁴ University of Kentucky, Lexington, KY⁵ University of California, Berkeley, CA Oak trees, nitrification and nitrate leaching in forests of the Catskill Mountains, NY.

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9:15 AM Finzi, Adrien^*,1, Berthring, Sean¹, ¹ Boston University, Boston, MA, 02215 Organic nitrogen cycling in temperate forests of southern New England.

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9:40 AM Break.

9:50 AM Reed, Sasha^{*,1, 2}, Townsend, Alan^{1, 2}, Cleveland, Cory², ¹ University of Colorado, Boulder, CO² Institute for Arctic and Alpine Research (INSTAAR), Boulder, CO Nutrient controls of nitrogen fixation in a tropical rainforest.

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10:10 AM Ostertag, Rebecca^*,1, ¹ University of Hawaii at Hilo, Hilo, HI Fertilization and foliar nitrogen and phosphorus relationships in two Hawaiian montane wet forests.

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10:30 AM Tomaszewski, Timothy ^*,1, Sievering, Herman ^{1, 2}, ¹ University of Colorado, Boulder, CO, USA² University of Colorado, Denver, CO, USA Non-photochemical quenching (NPQ) of first-year spruce foliage responds to nitrogen in simulated wet deposition at a Colorado subalpine forest.

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10:50 AM Silver, Whendee^*,1, Thompson, Andrew¹, Bradbury, Damon¹, Chapin, F. Stuart², Ewel, John³, Firestone, Mary¹, ¹ University of California, Berkeley, CA² University of Alaska, Fairbanks, Alaska³ USDA Forest Service, Honolulu, HI A latitudinal gradient in nitrogen retention and loss: The role of dissimilatory nitrate reduction to ammonium.

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11:10 AM Houlton, Benjamin¹, Sigman, Daniel¹, Hedin, Lars¹, ¹ Princeton University, Princeton, New Jersey, USA ¹⁵N/¹⁴N as a proxy for gaseous nitrogen losses across a forest rainfall gradient.

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