[UNKNOWN: PRESTIME] Kauffman, J. Boone^*,1, Hughes, Flint², Watson, Vicente³, Jobse, Judith¹, Tosi, Joseph³, ¹ Oregon State University, Corvallis, OR² USDA Forest Servoce - Institute of Pacific Islands Forestry, Hilo, HA³ Centro Cientifico Tropical, San Jose, Costa Rica. Ecosystem C pools of primary tropical forests along climatic and elevation gradients in Costa Rica .

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[UNKNOWN: PRESTIME] Hoover, Coeli^*,1, Magrini, Kimberly², Evans, Robert², ¹ USDA Forest Service, Irvine, PA² National Renewable Energy Laboratory, Golden, CO. Tree species effects on soil carbon: a case study using molecular beam mass spectrometry.

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[UNKNOWN: PRESTIME] Chen, Wenjun^*,1, ¹ Canada Centre for Remote Sensing, Ottawa, Ontario, Canada. Estimating forest fine root biomass and production from aboveground measurements: A new paradigm.

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[UNKNOWN: PRESTIME] MORRIS, SHERRI^*,1, LEAVITT, STEVEN², GREGORICH, ED³, PAUL, ELDOR⁴, ¹ Bradley University, Peoria, IL² University of Arizona, Tucson, AZ³ Agriculture Canada, Ottawa, Ontario, Canada⁴ Colorado State University, Fort Collins, CO. Role of resistant fractions in soil C sequestration.

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[UNKNOWN: PRESTIME] Waldrop, Mark^*,1, Firestone, Mary², ¹ School of Natural Resources and Environment, Ann Arbor, MI² Division of Ecosystem Science- ESPM, Berkeley, CA. Isotopic evidence for plant community alteration of C-cycling microbial functional groups in soil.

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[UNKNOWN: PRESTIME] Giardina, Christian^*,1, Binkley, Dan², ¹ USDA Forest Service, Houghton, MI² Colorado State University, Fort Collins, CO. Sources of soil surface CO₂ efflux in a tropical plantation forest.

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[UNKNOWN: PRESTIME] Mitchell, Katherine^*,1, Peters, Debra¹, Herrick, Jeffrey¹, Monger, Curtis², ¹ USDA-ARS, Jornada Experimental Range, Las Cruces, NM, kathmitc@nmsu.edu² New Mexico State University, Las Cruces, NM. Long term changes in carbon pools accompanying shrub invasion of a desert grassland: The Jornada Experimental Range 1850 - today.

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[UNKNOWN: PRESTIME] OGLE, STEPHEN^*,1, BREIDT, F. JAY¹, EVE, MARLEN¹, PAUSTIAN, KEITH¹, ¹ Colorado State University, Fort Collins, CO. SOC sequestration in U.S. agricultural lands between 1992 and 1997: Uncertainty analysis.

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[UNKNOWN: PRESTIME] Zhuang, Qianlai^*,1,2, Clein, Joy², McGuire, David³, Dargaville, Roger⁴, Romanovsky, Vladimir⁵, Harden, Jeniffer⁶, Kicklighter, David¹, Melillo, Jerry¹, ¹ The Ecosystems Center, Woods Hole, MA² The Institute of Arctic Biology, Fairbanks, AK³ U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, Fairbanks, AK⁴ Ecosystem Dynamics and the Atmosphere, Boulder, CO⁵ Geophysical Institute, Fairbanks, AK⁶ U.S. Geological Survey, Menlo park, CA. Modeling the effects of soil thermal dynamics on the seasonality of carbon fluxes across northern temperate and high latitude regions.

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[UNKNOWN: PRESTIME] Luo, Yiqi^*,1, White, Luther¹, DeLucia, Evan², Finzi, Adrien³, Lichter, John⁴, Schlesinger, William⁵, ¹ Univeristy of Oklahoma, Norman, OK² , University of Illinois, Urbana, IL³ Boston University, Boston, MA⁴ Bowdoin College, Brunswick, Maine⁵ Duke University, Durham, NC. Sustainability of carbon sequestration in the Duke Forest ecosystem.

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[UNKNOWN: PRESTIME] Sievering, Herman^*,1,3, Tomaszewski, Timothy³, Torizzo, Jonathan², Turnipseed, Andrew⁴, Boyce, Richard⁵, ¹ Global Change & Environ. Qual. Prog. and INSTAAR, Denver/Boulder, CO³ INSTAAR and Environmental Sciences, Boulder, CO² Global Change & Environ. Qual. Prog., Denver, CO⁴ Dept. of EPOB Biology, Boulder, CO⁵ INSTAAR, Boulder, CO. Canopy uptake of atmospheric nitrogen and potential carbon sequestration at a Colorado subalpine forest.

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[UNKNOWN: PRESTIME] San José, José^*,1, Montes, Rubén², ¹ Instituto Venezolano de Investigaciones Científicas, Caracas, D.C., Venezuela² Universidad Simón Bolívar, Caracas, D.C., Venezuela. The flux of carbon due to land-use changes in the Orinoco savannas.

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[UNKNOWN: PRESTIME] Baisden, W.^*,1, Parfitt, Roger¹, Trustrum, Noel¹, ¹ Landcare Research, Palmerston North, New Zealand. Are eroding landscapes C sources or sinks: testing the "dynamic equilibrium" hypothesis in highly erodible New Zealand pasture.

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[UNKNOWN: PRESTIME] McCulley, Rebecca^*,1, Burke, Ingrid¹, Lauenroth, William¹, Kelly, Eugene¹, Knapp, Alan², ¹ Colorado State University, Ft. Collins, CO² Kansas State University, Manhattan, KS. Interannual variability in carbon cycling across the Great Plains Region.

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