B21N:
Understanding Mechanisms Governing Ecosystem Biogeochemical Cycling in the Solid, Liquid, and Gas Phase: Physiology vs. Physics and Chemistry I 

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Session ID#: 15339

Session Description:
Soils are the largest global source of N2O emissions. In cold climates, nitrous oxide emissions are enhanced by freeze-thaw cycles and can be a significant proportion of the annual emissions from soils.  A combination of microbially -driven processes and physico-chemical conditions induced by freeze/thaw cycles are related to enhanced N2O emissions, but the interactions between these key drivers are not well understood. A warming and more variable climate could increase the frequency, duration, and spatial extent of freeze-thaw events in cold climates. Improved knowledge of the extent of freeze-thaw enhanced N2O emissions and driving mechanisms is essential to predicting the impact of climate change on N2O emissions from soils. This session will bring together researchers examining the combination and interaction of microbial and physical mechanisms on N2O emissions during freeze-thaw cycles.
Primary Convener:  Peter M Homyak, University of California Irvine, Irvine, CA, United States
Conveners:  Martin Maier, University of Freiburg, Chair of Soil Ecology, Freiburg, Germany, Nicolas Brueggemann, Institute of Bio- and Geosciences – Agrosphere (IBG 3), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany, Julich, Germany and Claudia Wagner-Riddle, University of Guelph, School of Environmental Sciences, Guelph, ON, Canada
Chairs:  Martin Maier, University of Freiburg, Chair of Soil Ecology, Freiburg, Germany and Peter M Homyak, University of California Irvine, Irvine, CA, United States
OSPA Liaison:  Claudia Wagner-Riddle, University of Guelph, School of Environmental Sciences, Guelph, ON, Canada
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0426 Biosphere/atmosphere interactions [BIOGEOSCIENCES]
0486 Soils/pedology [BIOGEOSCIENCES]
0490 Trace gases [BIOGEOSCIENCES]

Abstracts Submitted to this Session:

Abiotic and biotic controls over biogeochemical cycles in drylands: Insights from climate change and nitrogen deposition experiments on the Colorado Plateau (Invited) (118681)
Sasha Reed1, Scott Ferrenberg2, Colin Tucker3, William Austin Rutherford4, Timothy Michael Wertin5, Theresa Ann McHugh6, Ember Morrissey7, Cheryl Kuske8, Rebecca Mueller8 and Jayne Belnap9, (1)U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, United States, (2)Southwest Biological Science Center Moab, Moab, UT, United States, (3)Southwest Biological Science Center Moab, Moab, United States, (4)University of Arizona, Tucson, AZ, United States, (5)University of Illinois at Urbana Champaign, Institute for Genomic Biology, Urbana, IL, United States, (6)Colorado Mesa University, Grand Junction, CO, United States, (7)West Virginia University, Department of Biology, Morgantown, WV, United States, (8)Los Alamos National Laboratory, Los Alamos, NM, United States, (9)U.S. Geological Survey Center for Integrated Data Analytics, Middleton, WI, United States
Iron Redox Dynamics From Surface to Bedrock in a Deep Tropical Forest Soil: a New Conceptual Model (127711)
Steven J Hall, Iowa State University, Department of Ecology, Evolution, and Organismal Biology, AMES, United States, Daniel Liptzin, Soil Health Institute, Morrisville, United States, Heather L Buss, University of Bristol, Bristol, United Kingdom, Kristen M DeAngelis, University of Massachusetts Amherst, Department of Microbiology, Amherst, United States and Whendee L Silver, University of California, Berkeley, Dept. of Environmental Science, Policy, & Management, Berkeley, CA, United States
Nitrous oxide cycling in the Eastern Tropical South Pacific Oxygen Deficient Zone (Invited) (118411)
Karen L Casciotti1, Matthew Sean Forbes2, Jagruti Vedamati3 and Brian D Peters3, (1)Stanford University, Earth System Science, Stanford, United States, (2)Stanford University, Earth System Science, Stanford, CA, United States, (3)Stanford Earth Sciences, Stanford, CA, United States
The Amplitude of Soil Freeze-Thaw Cycles Influences Dynamics of N2O Emissions and Denitrifier Transcriptional Activity and Community Composition (Invited) (119522)
Claudia Goyer1, Sophie Wertz2, Enrico Tatti2, Bernie Zebarth2, David Burton3, Martin Chantigny4 and Martin Filion5, (1)Agriculture and Agri-Food Canada, Fredericton Research and Development Centre, Ottawa, ON, Canada, (2)Agriculture and Agri-Food Canada, Fredericton Research and Development Centre, Fredericton, NB, Canada, (3)Dalhousie University, Environmental Sciences, Halifax, NS, Canada, (4)Agriculture and Agri-Food Canada, Quebec Research and Development Centre, Quebec, QC, Canada, (5)Université de Moncton, Département de Biologie, Moncton, NB, Canada
Freeze-Thaw Cycles and Soil Biogeochemistry: Implications for Greenhouse Gas emission (Invited) (127259)
Fereidoun Rezanezhad1, Tatjana Milojevic2, Hyumin Danny Oh3, Chris Thomas Parsons3, Christina Marie Smeaton3 and Philippe Van Cappellen4, (1)Ecohydrology Research Group, University of Waterloo, Earth and Environmental Sciences, Waterloo, ON, Canada, (2)University of Waterloo, Earth and Environmental Sciences, Waterloo, ON, Canada, (3)University of Waterloo, Ecohydrology Research Group, Waterloo, ON, Canada, (4)University of Waterloo, Department of Earth and Environmental Sciences, Waterloo, ON, Canada
Abiotic controls on N2O emissions from soils and wetlands (Invited) (121292)
William R Horwath, University of California Davis, Land, Air, and Water Resources, Davis, CA, United States
Seven years of dynamic snowpack CO2 profiles, fluxes, and winter soil respiration in a mortality-impacted subalpine forest (Invited) (119194)
William J Massman, US Forest Service, Fort Collins, United States, Erin Berryman, US Forest Service (contractor), Forest Health Assessment and Applied Sciences Team, Fort Collins, CO, United States and John M Frank, U.S. Forest Service, Fort Collins, United States
Examining Mechanisms of Methane Transport in Populus trichocarpa (Invited) (148842)
Todd N Rosenstiel1, Ellynne Kutschera2, Andrew L Rice3 and Aslam Kahlil2, (1)Portland State University, Portland, United States, (2)Portland State University, Portland, OR, United States, (3)Portland State University, Physics, Portland, OR, United States

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