[UNKNOWN: PRESTIME] AUSTIN, AMY^*,1, SALA, OSVALDO¹, ¹ University of Buenos Aires and IFEVA-CONICET, Buenos Aires, ARGENTINA. Nitrogen transformations along a rainfall gradient in Patagonia, Argentina: role of carbon-nutrient interactions.

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[UNKNOWN: PRESTIME] Bradford, John^*,1,2, Lauenroth, William^1,2, Burke, Ingrid^1,3, Paruelo, Jose⁴, ¹ Graduate Degree Program In Ecology, Fort Collins, CO² Rangeland Ecosystem Science Department, Fort Collins, CO³ Forest Sciences Department, Fort Collins, CO⁴ IFEVA- Departamento del Ecologia, Facultad de Agronomia, Buenos Aires, Argentina. The influence of cultivation on aboveground net primary production in the U.S. Great Plains.

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[UNKNOWN: PRESTIME] MATAMALA, ROSER^*,1, JASTROW, JULIE¹, AMTHOR, JEFF², GARTEN, CHARLIE³, MILLER, MICHAEL¹, ¹ Argonne National Laboratory, Argonne, IL² US Department of Energy, Germantown, MD³ Oak Ridge National Laboratory, Oak Ridge, TN. Increasing soil carbon and nitrogen stocks under tallgrass prairie: Influence of soil type.

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[UNKNOWN: PRESTIME] Burke, Ingrid^*,1, Lowe, Petra¹, Lauenroth, William¹, Mosier, Arvin², Sala, O⁵, Aguiar, M⁵, ¹ Colorado State University, Fort Collins, CO² Colorado State University, Fort Collins, CO⁵ Department of Ecology, AR. Biogeochemical consequences of resource and environmental manipulation in shortgrass steppe.

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[UNKNOWN: PRESTIME] Barger, Nichole^*,1, Belnap, Jayne², Ojima, Dennis¹, ¹ Colorado State University, Fort Collins, CO² USGS-Biological Resources Division, Moab, UT. The role of biological soil crusts in ecosystem N cycling on the Colorado Plateau.

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[UNKNOWN: PRESTIME] Thomas, Michael^*,1, Galloway, David², Farnden, Kevin³, ¹ Mesa Community College, Mesa, Arizona² LandCare Research New Zealand Ltd., Dunedin, New Zealand³ University of Otago, Dunedin, New Zealand. The relationship between carbon and nitrogen in New Zealand lichens.

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[UNKNOWN: PRESTIME] Eviner, Valerie^*,1, Chapin, F. Stuart², ¹ Institute of Ecosystem Studies, Millbrook, NY² University of Alaska, Fairbanks, Fairbanks, AK. Plant trait interactions determine ecosystem effects of plant species and plant species mixtures.

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[UNKNOWN: PRESTIME] Grandy, A. Stuart^*,1,2, Roberston, G. Philip^1,2, ¹ Michigan State University, East Lansing, MI² WK Kellogg Biological Station, Hickory Corners, MI. Soil aggregation and organic matter quality: effects on carbon turnover in eleven ecosystems along a management intensity gradient.

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[UNKNOWN: PRESTIME] Mates-Muchin, Jonathan^*,1, Lewis, James¹, ¹ Fordham University, Armonk, NY. Change in forest nitrogen cycling during the decline of a dominant tree species.

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[UNKNOWN: PRESTIME] Silver, Whendee^*,1, Thompson, Andrew¹, Firestone, Mary¹, Ewel, John², Reich, Alex³, ¹ University of California-Berkeley, Berkeley, CA² USDA Forest Service, Honolulu, HI³ Organization for Tropical Studies, Durham, NC. Dissimilatory nitrate reduction to ammonium and nitrous oxide losses in humid Costa Rican forests.

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[UNKNOWN: PRESTIME] Steltzer, Heidi^*,1, Stottlemyer, Robert², Binkley, Dan¹, ¹ Colorado State University, Fort Collins, CO² United States Geological Survey, Fort Collins, CO. Tree islands in a sea of arctic tundra: soil C pools, forest change, and N availability.

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[UNKNOWN: PRESTIME] Leadley, Paul^*,1, Barnard, Romain¹, Barthes, Laure¹, ¹ Laboratory of Ecology, Evolution and Systematics, Orsay, France. Effects of elevated CO₂ on nitrate leaching and denitrification in herbaceous ecosystems.

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[UNKNOWN: PRESTIME] Kaushal, Sujay^*,1, Lewis, William, ¹ Center for Limnology, Boulder, CO. Ecological significance of dissolved organic nitrogen exported from minimally disturbed watersheds.

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[UNKNOWN: PRESTIME] Brandes, Jay^*,1, Townsend-Small, Amy¹, Haberer, Jaime¹, Llerena, Carlos², McClain, Michael³, ¹ The University of Texas at Austin, Austin, TX² Universidad Nacional Agraria La Molina, Lima, Peru³ Florida International University, Miami, Fl. Comparisons of stable isotopic trends in vegetation, soils and particulate matter of contrasting catchments in the Andean Amazon of Peru.

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