B23I:
Soil Carbon Dynamics: Models and Experiments Investigating Controls on Soil Organic Matter Vulnerability in Dynamic Landscapes I

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Session ID#: 15351

Session Description:
The controls on the stabilisation, transformation, and loss of soil organic matter (SOM) in terrestrial ecosystems during periods of natural- or anthropogenic-induced change are marked by an interplay of abiotic and biotic factors operating at a range of scales. Improved understanding of the key biotic as well as abiotic drivers that control fate of soil organic matter in dynamic landscapes is essential for quantification of magnitudes and understanding of mechanisms that control SOM dynamics at the profile, plot, landscape, and global scales. Moreover, proper understanding of the independent and interactive effects of biotic and abiotic drivers is key to our ability to manage soils to deliver key ecosystem services including carbon sequestration and nutrient cycling, and requires a multi-disciplinary and global approach. This session encourages contributions from physical, chemical, biological, and mathematical biogeoscientists working at a range of scales, in different biomes, and in managed or unmanaged systems.
Primary Convener:  Asmeret Asefaw Asefaw Berhe, University of California Merced, Department of Life and Environmental Sciences, Merced, CA, United States
Conveners:  Caitlin Hicks Pries, Lawrence Berkeley National Laboratory, Berkeley, CA, United States, Jennifer Dungait, Rothamsted Research, Devon, United Kingdom and Katerina Georgiou, University of California Berkeley, Berkeley, United States
Chairs:  Jennifer Dungait, Rothamsted Research, Devon, United Kingdom and Asmeret Asefaw Asefaw Berhe, University of California Merced, Department of Life and Environmental Sciences, Merced, CA, United States
OSPA Liaison:  Katerina Georgiou, University of California Berkeley, Berkeley, United States
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0428 Carbon cycling [BIOGEOSCIENCES]
0470 Nutrients and nutrient cycling [BIOGEOSCIENCES]
0486 Soils/pedology [BIOGEOSCIENCES]

Abstracts Submitted to this Session:

Soil Organic Matter (De)Stabilization – New Experiments Needed to Inform Soil Biogeochemistry Modules in Earth System Models (Invited) (118523)
Michael W I Schmidt, University of Zurich, Zurich, Switzerland, Margaret S Torn, Lawrence Berkeley National Laboratory, Climate and Ecosystem Sciences Division, Berkeley, CA, United States and William J Riley, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Topography and vegetation alter soil nitrogen availability and loss in tropical and temperate ecosystems (Invited) (166032)
Samantha R Weintraub-Leff, National Ecological Observatory Network, Battelle, Boulder, United States
A first look at the turnover dynamics of low molecular weight organic carbon in shallow and deep soils of coastal prairie grassland ecosystem. (162263)
Jack W Mcfarland1, Corey R Lawrence2, Courtney Creamer3, Christopher H Conaway4, Monica Haw3 and Mark P Waldrop5, (1)US Department of Interior, Geological Survey, Menlo Park, United States, (2)US Geological Survey, Geoscience and Environmental Change Science Center, Denver, United States, (3)U.S. Geological Survey, Geology, Minerals, Energy, and Geophysics Science Center, Menlo Park, United States, (4)U.S. Geological Survey, Menlo Park, CA, United States, (5)USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States
From hilltop to kettle hole: what trends across the terrestrial-aquatic transition zone are revealed by organic matter stable isotope (δ13C and δ15N) composition? (186467)
Zachary E Kayler1,2, Kai Nils Nitzsche3, Arthur Gessler4, Michael L Kaiser5, Carsten Hoffmann6, Katrin Premke2 and Ruth Ellerbrock6, (1)US Forest Service Houghton, Houghton, MI, United States, (2)Inst for Landschaftsstoffdynam, Muncheberg, Germany, (3)Leibniz Centre for Agricultural Landscape Research, Institute for Landscape Biogeochemistry, Müncheberg, Germany, (4)WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Forest Growth and Climate, Birmensdorf, Switzerland, (5)University of Kassel, Environmental Chemistry, Kassel, Germany, (6)Leibniz Centre for Agricultural Landscape Research, Institue of Soil Landscape Research, Müncheberg, Germany
The effects of redox fluctuation on iron-organic matter interactions in wet tropical soils (189294)
Amrita Bhattacharyya1,2, Ashley Campbell3, Yang Lin4, Peter S Nico5, Whendee L Silver6 and Jennifer Pett-Ridge3, (1)Lawrence Berkeley National Laboratory, Earth and Environmental Sciences Area, Berkeley, CA, United States, (2)Lawrence Livermore National Laboratory, Chemical Sciences Division, Livermore, CA, United States, (3)Lawrence Livermore National Laboratory, Livermore, CA, United States, (4)University of California Santa Barbara, Santa Barbara, CA, United States, (5)Lawrence Berkeley National Laboratory, Berkeley, CA, United States, (6)University of California, Berkeley, Dept. of Environmental Science, Policy, & Management, Berkeley, CA, United States
Spatially Differentiated Soil CO2 Emissions from Six Hillslopes (155755)
Yaxian Hu1, Rui Wang1, Zhiqi Wang1, Nikolaus J Kuhn2 and Shengli Guo1, (1)Northwest A&F University, Yangling, China, (2)University of Basel, Basel, Switzerland
SOM Stability under Long-term Recovery from Acidic Deposition in a Northern Hardwood Forest (175472)
Richard Marinos, Duke University, Durham, NC, United States, Emily S Bernhardt, Duke University, Biology, Durham, NC, United States, Peter M Groffman, Cary Institute of Ecosystem Studies, Millbrook, United States, Gene Likens, University of Connecticut, Department of Ecology and Evolutionary Biology, Groton, CT, United States and Emma J Rosi-Marshall, Cary Institute of Ecosystem Studies, Millbrook, NY, United States
Long-term Stabilization of Deep Soil Carbon revisited: The Meaning of Deep Roots (172037)
Martina I. Gocke, University of Bonn, Bonn, Germany and Guido LB Wiesenberg, University of Zurich, Department of Geography, Zurich, Switzerland

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