B21J:
Soil Organic Matter and the Global Carbon Cycle: Mechanisms for Accumulation and Loss in a Changing World I

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Session ID#: 31792

Session Description:
The reservoir of carbon contained in soil organic matter is exceedingly large. However the mechanisms for it’s accumulation, retention and loss are not well understood. Our ability to predict how climate change and man’s alteration of the terrestrial landscape affect soil organic matter dynamics ultimately depend on a deeper understanding of the underlying mechanisms. This session will focus on empirical and modeling studies of soils and carbon: storage potential, mechanisms of stabilization/ destabilization/ long term storage, and ecosystem vulnerability. Isotopic, geochemical, spectroscopic and other novel molecular techniques that probe deeper into the fate and function of organic matter across spatial and temporal scales are especially encouraged.
Primary Convener:  Marc G Kramer, Washington State University Vancouver, School of the Environment, Vancouver, WA, United States
Conveners:  Nancy Cavallaro, USDA Washington DC, Washington, DC, United States and Kate Lajtha, Oregon State University, Corvallis, OR, United States
Chairs:  Marc G Kramer, Washington State University Vancouver, School of the Environment, Vancouver, WA, United States and Kate Lajtha, Oregon State University, Corvallis, OR, United States
OSPA Liaison:  Nancy Cavallaro, USDA Washington DC, Washington, DC, United States
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
0454 Isotopic composition and chemistry [BIOGEOSCIENCES]
0486 Soils/pedology [BIOGEOSCIENCES]

Abstracts Submitted to this Session:

The Changing Energy Sources of Soil Respiration Seasonally and with Experimental Warming (241637)
Caitlin Hicks Pries, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Dartmouth College, Department of Biological Sciences, Hanover, NH, United States, Alon Angert, Hebrew University of Jerusalem, Jerusalem, Israel, Cristina Castanha, Lawrence Berkeley National Laboratory, Climate and Ecosystem Sciences Division, Berkeley, United States, Boaz Hilman, Max Planck Institute for Biogeochemistry, Jena, Germany and Margaret S Torn, Berkeley Lab/UC Berkeley, Berkeley, United States
Synchrotron-based micro and nanotomographic investigations of soil aggregate microbial and pore structure (Invited) (218722)
Ken M Kemner1, Sarah O'Brien2, Matthew D. Whiteside3, Deirdre Sholto-Douglas4, Olga Antipova5, Vanessa L Bailey6, Maxim Boyanov4, Alice Dohnalkova7, Doga Gursoy4, Libor Kovarik6, Barry Lai4, Christian Roehrig4 and Stefan Vogt4, (1)Argonne National Laboratory, Biosciences Division, Argonne, IL, United States, (2)University of Illinois at Chicago, Chicago, IL, United States, (3)Vrije Universiteit Amsterdam, Department of Ecological Sciences, Amsterdam, Netherlands, (4)Argonne National Laboratory, Argonne, IL, United States, (5)Argonne National Laboratory, X-ray Science Division, Argonne, IL, United States, (6)Pacific Northwest National Laboratory, Richland, WA, United States, (7)Environmental Molecular Sciences Laboratory, Richland, WA, United States
Nitrogen fertilization decouples roots and microbes: Reductions in belowground carbon allocation limit microbial activity (228578)
Joseph Carrara1, Christopher A Walter2, Rajanikanth Govindarajulu1, Jennifer Hawkins1 and Edward R Brzostek1, (1)West Virginia University, Biology, Morgantown, WV, United States, (2)University of Minnesota Twin Cities, Ecology, Evolution, and Behavior, Saint Paul, MN, United States
The origin of soil organic matter controls its composition and bioreactivity across a mesic boreal forest latitudinal gradient (277262)
Lukas Kohl, Memorial University of Newfoundland, Department of Earth Science, St John's, NF, Canada; University of Helsinki, Department of Agricultural Science and Institute for Atmospheric and Earth System Research / Forest Sciences, Faculty of Agriculture and Forestry, Helsinki, Finland, Michael J Philben, Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, United States, Kate A. Edwards, Natural Resources Canada, Canadian Forest Service, Ottawa, ON, Canada, Frances A. Podrebarac, USDA Agricultural Research Service, Starkville, MS, United States, Warren Jamie, Memorial University, Department of Earth Sciences, St. John's, NF, Canada and Susan E Ziegler, Memorial University of Newfoundland, Earth Science, St John's, NL, Canada
Temperature and chemical composition controls on sorption of DOC to iron hydroxides under dynamic flow conditions (208675)
Ellen Daugherty1, Gabriel Lobo2, Céline E Pallud2 and Thomas Borch3, (1)Colorado State University, Fort Collins, CO, United States, (2)University of California Berkeley, Berkeley, CA, United States, (3)Colorado State University, Chemistry, Fort Collins, United States
Assessing the dynamics of the upper soil layer relative to soil management practices (288405)
Jerry Hatfield, USDA ARS, Ames, IA, United States, Kenneth Wacha, USDA ARS, West Lafayette, United States and Christian Dold, USDA-ARS, National Laboratory for Agriculture and the Environment, Ames, IA, United States

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