Presentations & Posters

  • Hanson PJ, Ricciuto DM, Iversen CM, Griffiths N, Sebestyen S, Jensen A, Warren J, Norby, Shi X, Xu X, McFarlane KJ (2014) The S1-Bog Carbon Cycle and Projected Warming Responses for the SPRUCE Experiment. Presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Hanson PJ, Ricciuto DM, Thornton PE, Project Participants (2014) ORNL's Terrestrial Ecosystem Science Scientific Focus Area -2014. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Hook L, Devarakonda R, Riggs JS, Krassovski MB, Hanson PJ, Boden TA (2014) ORNL's TES SFA Data and Model Management and Archiving Facilitate Data Sharing and Model-Data Integration. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Jastrow J, Matamala R, McFarlane K, Fan Z, Porras R, Torn M, Guilderson T, Hanson P, (2014) Climatic and edaphic effects on root-and leaf-litter carbon inputs to temperate forest soils. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Ricciuto D, Thornton P, Shi X, Mao J, Hanson P, Sebestyen S, Griffiths N (2014) Modeling the Hydrological dynamics of the SPRUCE S1 Bog. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Schadt C, Hanson PJ, Steinweg M, Robeson MS, Zamin K, Kostka J (2014) Scoping potential microbial responses to warming and drying in the SPRUCE peatland ecosystem. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Xu X, Hanson PJ, Ricciuto D, Phillips JR, Shi X, Riggs JS, Iversen CM, Weston DJ, Hook LA, Thornton PE (2014) Integrating In-situ Data with a Model for Examining Community-level CO₂ and CH4 flux in a Carbon-rich Peatland in Northern Minnesota. Poster presentation given at the Joint TES/SBR Principal Investigator Meeting, May 5-7, 2014, Bolger Center, Md.
  • Hanson PJ, Chanton JP, Iversen CM, McFarlane KJ, Tfaily MM, Xu X (2013) Past and Future Stability of Deep Peatland Carbon Stocks: Assessing the Nature and Fate of Carbon in a Northern Minnesota Ombrotrophic Peatland, B11J-07, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Phillips JA, Hanson PJ, Riggs JS (2013) CO2 and CH4 Net Carbon Flux from a high-carbon peatland in Northern Minnesota: Plot scale observations of the Shrub, forb, Sphagnum and microbial community. GC51A-0942, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Chanton J, Tfaily MM, Kostka JE, Schadt CW, Hanson PJ, Cooper WT, Chanton P (2013) Humification and vertical stratification of organic matter transformations  in the peat column at the SPRUCE site. Marcell Experimental Forest.  B13H-0607, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Tfaily MM, Lin X, Chanton PR, Steinweg J, Esson K, Kostka J, Cooper T, Schadt CW, Hanson PJ, Chanton J (2013) Dissolved organic carbon cycling  and transformation dynamics in a northern forested peatland. B13H-0608, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Krassovski M, Hanson PJ, Boden T, Riggs J, Nettles WR, Hook LA (2013) SPRUCE experiment data infrastructure, IN41C-1615, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Walker AP, Zaehle S, DeKauwe MG, Medlyn BE, Dietze M, Hickler T, Iversen CM, Jain AK, McCarthy HR, Parton WJ, Prentice C, Thornton PE, Wang S, Wang Y-P, Warlind D, Warren J, Weng E, Hanson PJ, Oren R, Norby RJ (2013) Model-experimental synthesis at two FACE sites in the southeastern US. Forest ecosystem responses to elevated CO2. B13M-01, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Shi X, Thornton PE, Ricciuto DM, Hanson PJ, Mao J (2013) Development and testing the hydrological dynamics of vegetated wetland for CLM.   H13N-07, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Jastrow J, Calderon FJ, McFarlane KJ, Porras RC, Torn MS, Guilderson TP, Hanson PJ (2013) Climatic and edaphic effects on the turnover and composition of mineral-associated soil organic matter in temperate deciduous forests.  B24C-08, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Matamala R, Jastrow JD, McFarlane KJ, Guilderson TP, Hanson PJ (2013) Quantifying the amount of root-derived carbon retained in soil at 4 temperate deciduous forests.   B31C-0420, AGU Fall Meeting, San Francisco, CA, 9-13 December.
  • Hanson PJ, Barbier C, Riggs JS, Kolka RK, Sebestyen SE, Griffiths NA, Hook LA, Iversen CM, Warren JM, Weston DJ, Norby RJ (2013)  Whole-ecosystem warming and CO2 manipulation to assess ombrotrophic bog responses to hypothetical future environments. OOS 29-10, Annual meeting of the Ecological Society of America, Minneapolis, MN 4-9 August.
  • Kolka RK, Hanson PJ, Sebestyen SE (2013) Marcell Experimental Forest, USDA Forest Service peatland research past and present. OOS 29-1, Annual meeting of the Ecological Society of America, Minneapolis, MN 4-9 August.
  • Jensen AM, Warren JM, Hanson PJ, Childs J, Gunderson C, Weston DJ, Wullschleger SD (2013) Seasonal and spatial carbon assimilation patterns in black spruce; assessing temperature impacts at canopy level.   COS 53-8, Annual meeting of the Ecological Society of America, Minneapolis, MN 4-9 August.
  • Tran HE, Weston DJ, Warren JM, Hanson PJ, Norby RJ, Childs J, Wullschleger SD (2013) Scaling Sphagnum photosynthesis from leaf to plot in an ecosystem level climate change experiment.   PS 39-63, Annual meeting of the Ecological Society of America, Minneapolis, MN 4-9 August.
  • Steinweg MJ, Kostka JE, Hanson PJ, Schadt CW (2013) Spatial and temporal heterogeneity in bog enzymes and their temperature responses.   COS 82-2, Annual meeting of the Ecological Society of America, Minneapolis, MN 4-9 August.
  • Hanson PJ, Kolka RK, Barbier C, Grant RF, Hook LA, Iversen CM, Miller PA, Norby RJ, Palik B, Schadt CW, Sebestyen SD, Shi Y, Thornton PE, Warren JM, Weston DJ (2013) Spruce-Peatland Responses Under Climatic and Environmental Change An In Situ Warming by CO2 Manipulation of a Characteristic High-Carbon Ecosystem.   Invited talk for the Mer Bleue Carbon Meeting 2013, 4-5 March, Montreal, Canada.
  • Hanson PJ, Thornton PE, Miller PA, Grant RF, Kolka RK, Iversen CM, Norby RJ, Warren JM, Hook LA (2013) Evaluating high-carbon peatland responses to environmental change: a report on pre-treatment C stocks and fluxes for a characteristic ombrotrophic bog and projected response to warming by elevated CO2 treatments.   4th NACP All-Investigators Meeting, 4-7 February, Albequerque, New Mexico, http://www.nacarbon.org/cgi-bin/meeting_2013/mtg2013_ab_search.pl
  • Walker A, De Kauwe M, Dietze M, Hanson PJ, Hickler T, Jain AK, Luo Y, McCarthy H, Medlyn B, Norby RJ, Oren R, Parton WJ, Thornton PE, Wang S, Wang Y-P, Warland D, Weng E, Zaehle S (2013) A model-data synthesis of ecosystem responses to elevated CO2 at two FACE sites in the south eastern U.S.   4th NACP All-Investigators Meeting, 4-7 February, Albequerque, New Mexico, http://www.nacarbon.org/cgi-bin/meeting_2013/mtg2013_ab_search.pl
  • Pallardy SG, Gu L, Hanson PJ, Hosman KP, Riggs J (2013) Annual Variation in Functional Leaf Area and Photosynthetic Activity in a Drought-Prone Temperate Deciduous Forest    4th NACP All-Investigators Meeting, 4-7 February, Albequerque, New Mexico, http://www.nacarbon.org/cgi-bin/meeting_2013/mtg2013_ab_search.pl
  • Matamala R, Jastrow JD, McFarlane K, Porras R, Torn M, Guilderson T, Hanson PJ (2013) Climatic and edaphic controls over root decomposition and labile components of mineral-associated soil organic matter   4th NACP All-Investigators Meeting, 4-7 February, Albequerque, New Mexico, http://www.nacarbon.org/cgi-bin/meeting_2013/mtg2013_ab_search.pl
  • McFarlane K, Hanson PJ, Torn M, Matamala R, Jastrow JD, Porras RC, Guilderson T (2013) EBIS-AmeriFlux: Tracking Carbon Flux into Soil Sinks in Temperate Broadleaf Forests in the Eastern US with Radiocarbon. 4th NACP All-Investigators Meeting, 4-7 February, Albequerque, New Mexico, http://www.nacarbon.org/cgi-bin/meeting_2013/mtg2013_ab_search.pl
  • Kolka RK, Hanson PJ (2013) Spruce-Peatland Responses Under Climatic and Environmental change: an in situ warming by carbon dioxide manipulation of a forest bog in northern Minnesota. Invited presentation to Symposium on Peatlands and Climate Change. Society of Wetland Science Annual Meeting, Duluth, MN.
  • Barbier C., Hanson P.J, Todd, Jr D.E., Belcher D., Jekabson E.W., Thomas W.K., Riggs J.S>.  2012.  Air Flow and Heat Transfer in a Temperature-Controlled Open Top Enclosure. ASME International Mechanical Engineering Congress and Exposition. Houston, Texas. 11/2012, Paper #IMECE2012-86352
  • Hanson PJ, Kolka RK, Iversen C, Sebestyen SD, Norby RJ, Palik B, Thornton P, Warren J, Wullschleger SD, Les Hook L (2012)  Spruce-Peatland Responses Under Climatic and Environmental Change An In Situ Warming by CO2 Manipulation of a Characteristic High-Carbon Ecosystem. The 14th International Peat Congress Peatlands in Balance,  3 to 8 June 2012, Stockholm, Sweden, Abstract #109.
  • Iversen CM, Hanson PJ, Childs J, Norby RJ, Kolka RK, Barbier C, Bisht G, Griffiths NA, Hook LA, Palik B, Schadt CW, Sebestyen SD, Steinweg JM, Thomas WK, Thornton PE, Warren JM, Weston DJ, Wullschleger SD (2012)  Spruce Peatland Responses Under Climatic and Environmental change: An in situ warming by CO2 manipulation of a peatland ecosystem. 9th INTECOL Wetlands Conference - Welands in a Complex World, 3 to 8 June 2012, Orlando, Florida.
  • Kolka RK, Hanson PJ, Iversen C, Sebestyen SD, Norby RJ, Palik B, Thornton P, Warren J, Wullschleger SD, Hook L (2012) Spruce-peatland responses under climatic and environmental Change (SPRUCE Experiment): An in situ warming by CO2 manipulation of a characteristic high-carbon ecosystem. BIOGEOMON 2012: The 7th International Symposium on Ecosystem Behavior, 15 to 20 July 2012, Lincolnville, Maine. 
  • Kolka RK, Hanson PJ, Iversen CM, Sebestyen SD, Norby RJ, Palik B, Thornton PE, Warren JM, Wullschleger SD, Griffiths NA, Hook LA (2012) Spruce-Peatland Responses Under Climatic and Environmental change: an in situ warming by CO2 manipulation of a northern Minnesota bog. St. Louis River Estuary Science Summit, Superior, WI.
  • Reynolds, Kaycee (2011) Using stable isotopes of water to characterize the hydrological cycle in a northern Minnesota black spruce-sphagnum bog forest. ORISE SULI/HERE Poster Session, Oak Ridge National Laboratory, December 7, 2011.
  • Warren JM, Childs J, Gunderson CA, Hanson PJ, Wullschleger SD (2011) Ecophysiology of woody plants in an ombrotrophic spruce bog – potential impacts with climate change. Ecological Society of America Annual Meeting, Austin, TX, August 11, 2011. [abstract]
  • Campbell CA, Warren JM (2011) Sap Flux Density in Peatland Species: Root and Branch Water Conductance Under Simulated Drought Conditions. Furman University
  • Kolka RK, Sebestyen SD, Mitchell C, Nater E, Branfireun B, and Hanson PJ (2011) Mercury Processes under Elevated Carbon Dioxide and Soil Warming in a Peatland: Hypotheses for the SPRUCE Experiment. Halifax
  • Sebestyen SD, Hanson PJ, Kolka RK, Norby RJ, Palik B, Wullschleger SD, Garten CT, Thornton PE, Griffiths N, Mulholland PJ, Todd DE, Iversen CM, Warren JM, Hook LA (2011) An Overview of the SPRUCE Project, a Large-Scale Study of Increased Temperature and Carbon Dioxide Effects on a Northern Peatland. Gordon Conference on Catchment Science: Interactions of Hydrology, Biology & Geochemistry, Sentinels of Global Change, Bates College, Lewiston, ME, 10-15 July.
  • Sebestyen SD (2011) An overview of the SPRUCE project, a large-scale study of increased temperature and carbon dioxide effects on a northern peatland. 8th Annual Forestry, Wildlife and Natural Resource Research Review, University of Minnesota, Cloquet Forestry Center, Cloquet, MN, Feb 2011.
  • Sebestyen SD, Mulholland PJ, Griffiths N, Hanson PJ, Warren JM, Kolka RK (2011) Water research objectives of the SPRUCE experiment, a developing large-scale study of climate change effects on a northern peatland. Poster. 8th Annual Forestry, Wildlife and Natural Resource Research Review, University of Minnesota, Cloquet Forestry Center, Cloquet, MN, Feb 2011.
  • Sebestyen SD (2010) The SPRUCE Experiment at the Marcell Experimental Forest. Presented at the Carbon Sequestration Team and the Interagency Carbon Sequestration Team, Minnesota Department of Natural Resources, St. Paul, MN, 19 Aug.
  • Sebestyen SD (2010) The SPRUCE Experiment at the Marcell Experimental Forest. Video teleconference. VIdeoteleconference presentation to the First Friday All Climate Change Talks, USDA Forest Service, Eastern Forest Environmental Threat Center, Southern Research Station, 3 Sep.
  • Mulholland PJ, Sebestyen SD, Hanson PJ, Warren J, Kolka RK (2010) Water research within the spruce experiment, a large-scale study of climate change effects on a northern peatland. Abstract H41G-1178 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.
  • Hanson PJ, Kolka RK, Norby RJ, Palik B, Wullschleger SD, Garten Jr. CT, Sebestyen SD, Thornton PE, Bradford J, Mulholland PJ, Todd DE, Iversen C, Warren J (2010) Evaluating spruce peatland responses under climatic and environmental change using a replicated in situ field manipulation. Abstract : B21A-0293 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.
  • Hanson PJ (2009) Spruce and Peatland Responses Under Climatic and Environmental Change: SPRUCE Experiment Overview. U. S. Department of Energy, Program for Ecosystem Research (PER) 2009 Investigators Meeting, 17 and 18 November 2009, Arlington, Virginia.
  • Hanson PJ, Kolka RK, Norby RJ, Palik B, Wullschleger SD, Garten CT Jr, Sebestyen SD, Thornton PE, Bradford J, Mulholland PJ, Todd DE, Iversen C, Warren J (2009) Evaluating Spruce-Peatland Responses Under Climatic and Environmental Change Using An In Situ Field Manipulation. Marcell Experimental Forest 50th Anniversary Symposium, Grand Rapids, MN., 23-25 June

SPRUCE-Supported Workshops

Advancing minirhizotron use in peatland ecosystems

Colleen M. Iversen (iversencm@ornl.gov) organized and hosted a small workshop at ORNL on October 7-8, 2010 entitled “Advancing minirhizotron use to examine ephemeral root dynamics in peatland and high carbon ecosystems”. The workshop was funded by the New Phytologist Trust and the US DOE Office of Science.

The goals of the workshop were two-fold:
(1) Develop a consensus on the appropriate installation and use of minirhizotrons in peatlands and similar ecosystems, and
(2) Develop a manuscript to be submitted to New Phytologist that provides a review of minirhizotron results to date in peatland and other high carbon ecosystems, along with a suggested methodological framework to aid in future minirhizotron implementation in similar systems.

Conference participants included scientists from Alaska, California, Michigan, and Pennsylvania, along with Canada, Finland, and the UK who use minirhizotrons to examine fine-root production in ecosystems ranging from the arctic tundra to forested bogs. Several ORNL scientists, including Joanne Childs, Paul Hanson, Jeff Warren, Peter Thornton, and Stan Wullschleger also participated in the workshop.

A manuscript has been prepared for New Phytologist (a partial sponsor of the workshop) that presents a consensus opinion on the appropriate installation and use of minirhizotrons in peatlands and a methodological framework to aid in future minirhizotron implementation in similar systems.